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/home/tahkoom/public_html/wp-includes/sodium_compat/src/Core/Curve25519.php
<?php
if (class_exists('ParagonIE_Sodium_Core_Curve25519', false)) {
return;
}
/**
* Class ParagonIE_Sodium_Core_Curve25519
*
* Implements Curve25519 core functions
*
* Based on the ref10 curve25519 code provided by libsodium
*
* @ref https://github.com/jedisct1/libsodium/blob/master/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c
*/
abstract class ParagonIE_Sodium_Core_Curve25519 extends ParagonIE_Sodium_Core_Curve25519_H
{
/**
* Get a field element of size 10 with a value of 0
*
* @internal You should not use this directly from another application
*
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_0()
{
return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
);
}
/**
* Get a field element of size 10 with a value of 1
*
* @internal You should not use this directly from another application
*
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_1()
{
return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(1, 0, 0, 0, 0, 0, 0, 0, 0, 0)
);
}
/**
* Add two field elements.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @param ParagonIE_Sodium_Core_Curve25519_Fe $g
* @return ParagonIE_Sodium_Core_Curve25519_Fe
* @psalm-suppress MixedAssignment
* @psalm-suppress MixedOperand
*/
public static function fe_add(
ParagonIE_Sodium_Core_Curve25519_Fe $f,
ParagonIE_Sodium_Core_Curve25519_Fe $g
) {
/** @var array<int, int> $arr */
$arr = array();
for ($i = 0; $i < 10; ++$i) {
$arr[$i] = (int) ($f[$i] + $g[$i]);
}
return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($arr);
}
/**
* Constant-time conditional move.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @param ParagonIE_Sodium_Core_Curve25519_Fe $g
* @param int $b
* @return ParagonIE_Sodium_Core_Curve25519_Fe
* @psalm-suppress MixedAssignment
*/
public static function fe_cmov(
ParagonIE_Sodium_Core_Curve25519_Fe $f,
ParagonIE_Sodium_Core_Curve25519_Fe $g,
$b = 0
) {
/** @var array<int, int> $h */
$h = array();
$b *= -1;
for ($i = 0; $i < 10; ++$i) {
$x = (($f[$i] ^ $g[$i]) & $b);
$h[$i] = ($f[$i]) ^ $x;
}
return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
}
/**
* Create a copy of a field element.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_copy(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$h = clone $f;
return $h;
}
/**
* Give: 32-byte string.
* Receive: A field element object to use for internal calculations.
*
* @internal You should not use this directly from another application
*
* @param string $s
* @return ParagonIE_Sodium_Core_Curve25519_Fe
* @throws RangeException
* @throws TypeError
*/
public static function fe_frombytes($s)
{
if (self::strlen($s) !== 32) {
throw new RangeException('Expected a 32-byte string.');
}
$h0 = self::load_4($s);
$h1 = self::load_3(self::substr($s, 4, 3)) << 6;
$h2 = self::load_3(self::substr($s, 7, 3)) << 5;
$h3 = self::load_3(self::substr($s, 10, 3)) << 3;
$h4 = self::load_3(self::substr($s, 13, 3)) << 2;
$h5 = self::load_4(self::substr($s, 16, 4));
$h6 = self::load_3(self::substr($s, 20, 3)) << 7;
$h7 = self::load_3(self::substr($s, 23, 3)) << 5;
$h8 = self::load_3(self::substr($s, 26, 3)) << 4;
$h9 = (self::load_3(self::substr($s, 29, 3)) & 8388607) << 2;
$carry9 = ($h9 + (1 << 24)) >> 25;
$h0 += self::mul($carry9, 19, 5);
$h9 -= $carry9 << 25;
$carry1 = ($h1 + (1 << 24)) >> 25;
$h2 += $carry1;
$h1 -= $carry1 << 25;
$carry3 = ($h3 + (1 << 24)) >> 25;
$h4 += $carry3;
$h3 -= $carry3 << 25;
$carry5 = ($h5 + (1 << 24)) >> 25;
$h6 += $carry5;
$h5 -= $carry5 << 25;
$carry7 = ($h7 + (1 << 24)) >> 25;
$h8 += $carry7;
$h7 -= $carry7 << 25;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
$carry2 = ($h2 + (1 << 25)) >> 26;
$h3 += $carry2;
$h2 -= $carry2 << 26;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry6 = ($h6 + (1 << 25)) >> 26;
$h7 += $carry6;
$h6 -= $carry6 << 26;
$carry8 = ($h8 + (1 << 25)) >> 26;
$h9 += $carry8;
$h8 -= $carry8 << 26;
return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(
(int) $h0,
(int) $h1,
(int) $h2,
(int) $h3,
(int) $h4,
(int) $h5,
(int) $h6,
(int) $h7,
(int) $h8,
(int) $h9
)
);
}
/**
* Convert a field element to a byte string.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $h
* @return string
*/
public static function fe_tobytes(ParagonIE_Sodium_Core_Curve25519_Fe $h)
{
$h0 = (int) $h[0];
$h1 = (int) $h[1];
$h2 = (int) $h[2];
$h3 = (int) $h[3];
$h4 = (int) $h[4];
$h5 = (int) $h[5];
$h6 = (int) $h[6];
$h7 = (int) $h[7];
$h8 = (int) $h[8];
$h9 = (int) $h[9];
$q = (self::mul($h9, 19, 5) + (1 << 24)) >> 25;
$q = ($h0 + $q) >> 26;
$q = ($h1 + $q) >> 25;
$q = ($h2 + $q) >> 26;
$q = ($h3 + $q) >> 25;
$q = ($h4 + $q) >> 26;
$q = ($h5 + $q) >> 25;
$q = ($h6 + $q) >> 26;
$q = ($h7 + $q) >> 25;
$q = ($h8 + $q) >> 26;
$q = ($h9 + $q) >> 25;
$h0 += self::mul($q, 19, 5);
$carry0 = $h0 >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
$carry1 = $h1 >> 25;
$h2 += $carry1;
$h1 -= $carry1 << 25;
$carry2 = $h2 >> 26;
$h3 += $carry2;
$h2 -= $carry2 << 26;
$carry3 = $h3 >> 25;
$h4 += $carry3;
$h3 -= $carry3 << 25;
$carry4 = $h4 >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry5 = $h5 >> 25;
$h6 += $carry5;
$h5 -= $carry5 << 25;
$carry6 = $h6 >> 26;
$h7 += $carry6;
$h6 -= $carry6 << 26;
$carry7 = $h7 >> 25;
$h8 += $carry7;
$h7 -= $carry7 << 25;
$carry8 = $h8 >> 26;
$h9 += $carry8;
$h8 -= $carry8 << 26;
$carry9 = $h9 >> 25;
$h9 -= $carry9 << 25;
/**
* @var array<int, int>
*/
$s = array(
(int) (($h0 >> 0) & 0xff),
(int) (($h0 >> 8) & 0xff),
(int) (($h0 >> 16) & 0xff),
(int) ((($h0 >> 24) | ($h1 << 2)) & 0xff),
(int) (($h1 >> 6) & 0xff),
(int) (($h1 >> 14) & 0xff),
(int) ((($h1 >> 22) | ($h2 << 3)) & 0xff),
(int) (($h2 >> 5) & 0xff),
(int) (($h2 >> 13) & 0xff),
(int) ((($h2 >> 21) | ($h3 << 5)) & 0xff),
(int) (($h3 >> 3) & 0xff),
(int) (($h3 >> 11) & 0xff),
(int) ((($h3 >> 19) | ($h4 << 6)) & 0xff),
(int) (($h4 >> 2) & 0xff),
(int) (($h4 >> 10) & 0xff),
(int) (($h4 >> 18) & 0xff),
(int) (($h5 >> 0) & 0xff),
(int) (($h5 >> 8) & 0xff),
(int) (($h5 >> 16) & 0xff),
(int) ((($h5 >> 24) | ($h6 << 1)) & 0xff),
(int) (($h6 >> 7) & 0xff),
(int) (($h6 >> 15) & 0xff),
(int) ((($h6 >> 23) | ($h7 << 3)) & 0xff),
(int) (($h7 >> 5) & 0xff),
(int) (($h7 >> 13) & 0xff),
(int) ((($h7 >> 21) | ($h8 << 4)) & 0xff),
(int) (($h8 >> 4) & 0xff),
(int) (($h8 >> 12) & 0xff),
(int) ((($h8 >> 20) | ($h9 << 6)) & 0xff),
(int) (($h9 >> 2) & 0xff),
(int) (($h9 >> 10) & 0xff),
(int) (($h9 >> 18) & 0xff)
);
return self::intArrayToString($s);
}
/**
* Is a field element negative? (1 = yes, 0 = no. Used in calculations.)
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return int
* @throws SodiumException
* @throws TypeError
*/
public static function fe_isnegative(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$str = self::fe_tobytes($f);
return (int) (self::chrToInt($str[0]) & 1);
}
/**
* Returns 0 if this field element results in all NUL bytes.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return bool
* @throws SodiumException
* @throws TypeError
*/
public static function fe_isnonzero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
static $zero;
if ($zero === null) {
$zero = str_repeat("\x00", 32);
}
/** @var string $zero */
/** @var string $str */
$str = self::fe_tobytes($f);
return !self::verify_32($str, (string) $zero);
}
/**
* Multiply two field elements
*
* h = f * g
*
* @internal You should not use this directly from another application
*
* @security Is multiplication a source of timing leaks? If so, can we do
* anything to prevent that from happening?
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @param ParagonIE_Sodium_Core_Curve25519_Fe $g
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_mul(
ParagonIE_Sodium_Core_Curve25519_Fe $f,
ParagonIE_Sodium_Core_Curve25519_Fe $g
) {
// Ensure limbs aren't oversized.
$f = self::fe_normalize($f);
$g = self::fe_normalize($g);
$f0 = $f[0];
$f1 = $f[1];
$f2 = $f[2];
$f3 = $f[3];
$f4 = $f[4];
$f5 = $f[5];
$f6 = $f[6];
$f7 = $f[7];
$f8 = $f[8];
$f9 = $f[9];
$g0 = $g[0];
$g1 = $g[1];
$g2 = $g[2];
$g3 = $g[3];
$g4 = $g[4];
$g5 = $g[5];
$g6 = $g[6];
$g7 = $g[7];
$g8 = $g[8];
$g9 = $g[9];
$g1_19 = self::mul($g1, 19, 5);
$g2_19 = self::mul($g2, 19, 5);
$g3_19 = self::mul($g3, 19, 5);
$g4_19 = self::mul($g4, 19, 5);
$g5_19 = self::mul($g5, 19, 5);
$g6_19 = self::mul($g6, 19, 5);
$g7_19 = self::mul($g7, 19, 5);
$g8_19 = self::mul($g8, 19, 5);
$g9_19 = self::mul($g9, 19, 5);
$f1_2 = $f1 << 1;
$f3_2 = $f3 << 1;
$f5_2 = $f5 << 1;
$f7_2 = $f7 << 1;
$f9_2 = $f9 << 1;
$f0g0 = self::mul($f0, $g0, 26);
$f0g1 = self::mul($f0, $g1, 25);
$f0g2 = self::mul($f0, $g2, 26);
$f0g3 = self::mul($f0, $g3, 25);
$f0g4 = self::mul($f0, $g4, 26);
$f0g5 = self::mul($f0, $g5, 25);
$f0g6 = self::mul($f0, $g6, 26);
$f0g7 = self::mul($f0, $g7, 25);
$f0g8 = self::mul($f0, $g8, 26);
$f0g9 = self::mul($f0, $g9, 26);
$f1g0 = self::mul($f1, $g0, 26);
$f1g1_2 = self::mul($f1_2, $g1, 25);
$f1g2 = self::mul($f1, $g2, 26);
$f1g3_2 = self::mul($f1_2, $g3, 25);
$f1g4 = self::mul($f1, $g4, 26);
$f1g5_2 = self::mul($f1_2, $g5, 25);
$f1g6 = self::mul($f1, $g6, 26);
$f1g7_2 = self::mul($f1_2, $g7, 25);
$f1g8 = self::mul($f1, $g8, 26);
$f1g9_38 = self::mul($g9_19, $f1_2, 26);
$f2g0 = self::mul($f2, $g0, 26);
$f2g1 = self::mul($f2, $g1, 25);
$f2g2 = self::mul($f2, $g2, 26);
$f2g3 = self::mul($f2, $g3, 25);
$f2g4 = self::mul($f2, $g4, 26);
$f2g5 = self::mul($f2, $g5, 25);
$f2g6 = self::mul($f2, $g6, 26);
$f2g7 = self::mul($f2, $g7, 25);
$f2g8_19 = self::mul($g8_19, $f2, 26);
$f2g9_19 = self::mul($g9_19, $f2, 26);
$f3g0 = self::mul($f3, $g0, 26);
$f3g1_2 = self::mul($f3_2, $g1, 25);
$f3g2 = self::mul($f3, $g2, 26);
$f3g3_2 = self::mul($f3_2, $g3, 25);
$f3g4 = self::mul($f3, $g4, 26);
$f3g5_2 = self::mul($f3_2, $g5, 25);
$f3g6 = self::mul($f3, $g6, 26);
$f3g7_38 = self::mul($g7_19, $f3_2, 26);
$f3g8_19 = self::mul($g8_19, $f3, 25);
$f3g9_38 = self::mul($g9_19, $f3_2, 26);
$f4g0 = self::mul($f4, $g0, 26);
$f4g1 = self::mul($f4, $g1, 25);
$f4g2 = self::mul($f4, $g2, 26);
$f4g3 = self::mul($f4, $g3, 25);
$f4g4 = self::mul($f4, $g4, 26);
$f4g5 = self::mul($f4, $g5, 25);
$f4g6_19 = self::mul($g6_19, $f4, 26);
$f4g7_19 = self::mul($g7_19, $f4, 26);
$f4g8_19 = self::mul($g8_19, $f4, 26);
$f4g9_19 = self::mul($g9_19, $f4, 26);
$f5g0 = self::mul($f5, $g0, 26);
$f5g1_2 = self::mul($f5_2, $g1, 25);
$f5g2 = self::mul($f5, $g2, 26);
$f5g3_2 = self::mul($f5_2, $g3, 25);
$f5g4 = self::mul($f5, $g4, 26);
$f5g5_38 = self::mul($g5_19, $f5_2, 26);
$f5g6_19 = self::mul($g6_19, $f5, 25);
$f5g7_38 = self::mul($g7_19, $f5_2, 26);
$f5g8_19 = self::mul($g8_19, $f5, 25);
$f5g9_38 = self::mul($g9_19, $f5_2, 26);
$f6g0 = self::mul($f6, $g0, 26);
$f6g1 = self::mul($f6, $g1, 25);
$f6g2 = self::mul($f6, $g2, 26);
$f6g3 = self::mul($f6, $g3, 25);
$f6g4_19 = self::mul($g4_19, $f6, 26);
$f6g5_19 = self::mul($g5_19, $f6, 26);
$f6g6_19 = self::mul($g6_19, $f6, 26);
$f6g7_19 = self::mul($g7_19, $f6, 26);
$f6g8_19 = self::mul($g8_19, $f6, 26);
$f6g9_19 = self::mul($g9_19, $f6, 26);
$f7g0 = self::mul($f7, $g0, 26);
$f7g1_2 = self::mul($f7_2, $g1, 25);
$f7g2 = self::mul($f7, $g2, 26);
$f7g3_38 = self::mul($g3_19, $f7_2, 26);
$f7g4_19 = self::mul($g4_19, $f7, 26);
$f7g5_38 = self::mul($g5_19, $f7_2, 26);
$f7g6_19 = self::mul($g6_19, $f7, 25);
$f7g7_38 = self::mul($g7_19, $f7_2, 26);
$f7g8_19 = self::mul($g8_19, $f7, 25);
$f7g9_38 = self::mul($g9_19,$f7_2, 26);
$f8g0 = self::mul($f8, $g0, 26);
$f8g1 = self::mul($f8, $g1, 25);
$f8g2_19 = self::mul($g2_19, $f8, 26);
$f8g3_19 = self::mul($g3_19, $f8, 26);
$f8g4_19 = self::mul($g4_19, $f8, 26);
$f8g5_19 = self::mul($g5_19, $f8, 26);
$f8g6_19 = self::mul($g6_19, $f8, 26);
$f8g7_19 = self::mul($g7_19, $f8, 26);
$f8g8_19 = self::mul($g8_19, $f8, 26);
$f8g9_19 = self::mul($g9_19, $f8, 26);
$f9g0 = self::mul($f9, $g0, 26);
$f9g1_38 = self::mul($g1_19, $f9_2, 26);
$f9g2_19 = self::mul($g2_19, $f9, 25);
$f9g3_38 = self::mul($g3_19, $f9_2, 26);
$f9g4_19 = self::mul($g4_19, $f9, 25);
$f9g5_38 = self::mul($g5_19, $f9_2, 26);
$f9g6_19 = self::mul($g6_19, $f9, 25);
$f9g7_38 = self::mul($g7_19, $f9_2, 26);
$f9g8_19 = self::mul($g8_19, $f9, 25);
$f9g9_38 = self::mul($g9_19, $f9_2, 26);
$h0 = $f0g0 + $f1g9_38 + $f2g8_19 + $f3g7_38 + $f4g6_19 + $f5g5_38 + $f6g4_19 + $f7g3_38 + $f8g2_19 + $f9g1_38;
$h1 = $f0g1 + $f1g0 + $f2g9_19 + $f3g8_19 + $f4g7_19 + $f5g6_19 + $f6g5_19 + $f7g4_19 + $f8g3_19 + $f9g2_19;
$h2 = $f0g2 + $f1g1_2 + $f2g0 + $f3g9_38 + $f4g8_19 + $f5g7_38 + $f6g6_19 + $f7g5_38 + $f8g4_19 + $f9g3_38;
$h3 = $f0g3 + $f1g2 + $f2g1 + $f3g0 + $f4g9_19 + $f5g8_19 + $f6g7_19 + $f7g6_19 + $f8g5_19 + $f9g4_19;
$h4 = $f0g4 + $f1g3_2 + $f2g2 + $f3g1_2 + $f4g0 + $f5g9_38 + $f6g8_19 + $f7g7_38 + $f8g6_19 + $f9g5_38;
$h5 = $f0g5 + $f1g4 + $f2g3 + $f3g2 + $f4g1 + $f5g0 + $f6g9_19 + $f7g8_19 + $f8g7_19 + $f9g6_19;
$h6 = $f0g6 + $f1g5_2 + $f2g4 + $f3g3_2 + $f4g2 + $f5g1_2 + $f6g0 + $f7g9_38 + $f8g8_19 + $f9g7_38;
$h7 = $f0g7 + $f1g6 + $f2g5 + $f3g4 + $f4g3 + $f5g2 + $f6g1 + $f7g0 + $f8g9_19 + $f9g8_19;
$h8 = $f0g8 + $f1g7_2 + $f2g6 + $f3g5_2 + $f4g4 + $f5g3_2 + $f6g2 + $f7g1_2 + $f8g0 + $f9g9_38;
$h9 = $f0g9 + $f1g8 + $f2g7 + $f3g6 + $f4g5 + $f5g4 + $f6g3 + $f7g2 + $f8g1 + $f9g0 ;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry1 = ($h1 + (1 << 24)) >> 25;
$h2 += $carry1;
$h1 -= $carry1 << 25;
$carry5 = ($h5 + (1 << 24)) >> 25;
$h6 += $carry5;
$h5 -= $carry5 << 25;
$carry2 = ($h2 + (1 << 25)) >> 26;
$h3 += $carry2;
$h2 -= $carry2 << 26;
$carry6 = ($h6 + (1 << 25)) >> 26;
$h7 += $carry6;
$h6 -= $carry6 << 26;
$carry3 = ($h3 + (1 << 24)) >> 25;
$h4 += $carry3;
$h3 -= $carry3 << 25;
$carry7 = ($h7 + (1 << 24)) >> 25;
$h8 += $carry7;
$h7 -= $carry7 << 25;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry8 = ($h8 + (1 << 25)) >> 26;
$h9 += $carry8;
$h8 -= $carry8 << 26;
$carry9 = ($h9 + (1 << 24)) >> 25;
$h0 += self::mul($carry9, 19, 5);
$h9 -= $carry9 << 25;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
return self::fe_normalize(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(
(int) $h0,
(int) $h1,
(int) $h2,
(int) $h3,
(int) $h4,
(int) $h5,
(int) $h6,
(int) $h7,
(int) $h8,
(int) $h9
)
)
);
}
/**
* Get the negative values for each piece of the field element.
*
* h = -f
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return ParagonIE_Sodium_Core_Curve25519_Fe
* @psalm-suppress MixedAssignment
*/
public static function fe_neg(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$h = new ParagonIE_Sodium_Core_Curve25519_Fe();
for ($i = 0; $i < 10; ++$i) {
$h[$i] = -$f[$i];
}
return self::fe_normalize($h);
}
/**
* Square a field element
*
* h = f * f
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_sq(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$f = self::fe_normalize($f);
$f0 = (int) $f[0];
$f1 = (int) $f[1];
$f2 = (int) $f[2];
$f3 = (int) $f[3];
$f4 = (int) $f[4];
$f5 = (int) $f[5];
$f6 = (int) $f[6];
$f7 = (int) $f[7];
$f8 = (int) $f[8];
$f9 = (int) $f[9];
$f0_2 = $f0 << 1;
$f1_2 = $f1 << 1;
$f2_2 = $f2 << 1;
$f3_2 = $f3 << 1;
$f4_2 = $f4 << 1;
$f5_2 = $f5 << 1;
$f6_2 = $f6 << 1;
$f7_2 = $f7 << 1;
$f5_38 = self::mul($f5, 38, 6);
$f6_19 = self::mul($f6, 19, 5);
$f7_38 = self::mul($f7, 38, 6);
$f8_19 = self::mul($f8, 19, 5);
$f9_38 = self::mul($f9, 38, 6);
$f0f0 = self::mul($f0, $f0, 26);
$f0f1_2 = self::mul($f0_2, $f1, 26);
$f0f2_2 = self::mul($f0_2, $f2, 26);
$f0f3_2 = self::mul($f0_2, $f3, 26);
$f0f4_2 = self::mul($f0_2, $f4, 26);
$f0f5_2 = self::mul($f0_2, $f5, 26);
$f0f6_2 = self::mul($f0_2, $f6, 26);
$f0f7_2 = self::mul($f0_2, $f7, 26);
$f0f8_2 = self::mul($f0_2, $f8, 26);
$f0f9_2 = self::mul($f0_2, $f9, 26);
$f1f1_2 = self::mul($f1_2, $f1, 26);
$f1f2_2 = self::mul($f1_2, $f2, 26);
$f1f3_4 = self::mul($f1_2, $f3_2, 26);
$f1f4_2 = self::mul($f1_2, $f4, 26);
$f1f5_4 = self::mul($f1_2, $f5_2, 26);
$f1f6_2 = self::mul($f1_2, $f6, 26);
$f1f7_4 = self::mul($f1_2, $f7_2, 26);
$f1f8_2 = self::mul($f1_2, $f8, 26);
$f1f9_76 = self::mul($f9_38, $f1_2, 27);
$f2f2 = self::mul($f2, $f2, 27);
$f2f3_2 = self::mul($f2_2, $f3, 27);
$f2f4_2 = self::mul($f2_2, $f4, 27);
$f2f5_2 = self::mul($f2_2, $f5, 27);
$f2f6_2 = self::mul($f2_2, $f6, 27);
$f2f7_2 = self::mul($f2_2, $f7, 27);
$f2f8_38 = self::mul($f8_19, $f2_2, 27);
$f2f9_38 = self::mul($f9_38, $f2, 26);
$f3f3_2 = self::mul($f3_2, $f3, 26);
$f3f4_2 = self::mul($f3_2, $f4, 26);
$f3f5_4 = self::mul($f3_2, $f5_2, 26);
$f3f6_2 = self::mul($f3_2, $f6, 26);
$f3f7_76 = self::mul($f7_38, $f3_2, 26);
$f3f8_38 = self::mul($f8_19, $f3_2, 26);
$f3f9_76 = self::mul($f9_38, $f3_2, 26);
$f4f4 = self::mul($f4, $f4, 26);
$f4f5_2 = self::mul($f4_2, $f5, 26);
$f4f6_38 = self::mul($f6_19, $f4_2, 27);
$f4f7_38 = self::mul($f7_38, $f4, 26);
$f4f8_38 = self::mul($f8_19, $f4_2, 27);
$f4f9_38 = self::mul($f9_38, $f4, 26);
$f5f5_38 = self::mul($f5_38, $f5, 26);
$f5f6_38 = self::mul($f6_19, $f5_2, 26);
$f5f7_76 = self::mul($f7_38, $f5_2, 26);
$f5f8_38 = self::mul($f8_19, $f5_2, 26);
$f5f9_76 = self::mul($f9_38, $f5_2, 26);
$f6f6_19 = self::mul($f6_19, $f6, 26);
$f6f7_38 = self::mul($f7_38, $f6, 26);
$f6f8_38 = self::mul($f8_19, $f6_2, 27);
$f6f9_38 = self::mul($f9_38, $f6, 26);
$f7f7_38 = self::mul($f7_38, $f7, 26);
$f7f8_38 = self::mul($f8_19, $f7_2, 26);
$f7f9_76 = self::mul($f9_38, $f7_2, 26);
$f8f8_19 = self::mul($f8_19, $f8, 26);
$f8f9_38 = self::mul($f9_38, $f8, 26);
$f9f9_38 = self::mul($f9_38, $f9, 26);
$h0 = $f0f0 + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38;
$h1 = $f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38;
$h2 = $f0f2_2 + $f1f1_2 + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19;
$h3 = $f0f3_2 + $f1f2_2 + $f4f9_38 + $f5f8_38 + $f6f7_38;
$h4 = $f0f4_2 + $f1f3_4 + $f2f2 + $f5f9_76 + $f6f8_38 + $f7f7_38;
$h5 = $f0f5_2 + $f1f4_2 + $f2f3_2 + $f6f9_38 + $f7f8_38;
$h6 = $f0f6_2 + $f1f5_4 + $f2f4_2 + $f3f3_2 + $f7f9_76 + $f8f8_19;
$h7 = $f0f7_2 + $f1f6_2 + $f2f5_2 + $f3f4_2 + $f8f9_38;
$h8 = $f0f8_2 + $f1f7_4 + $f2f6_2 + $f3f5_4 + $f4f4 + $f9f9_38;
$h9 = $f0f9_2 + $f1f8_2 + $f2f7_2 + $f3f6_2 + $f4f5_2;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry1 = ($h1 + (1 << 24)) >> 25;
$h2 += $carry1;
$h1 -= $carry1 << 25;
$carry5 = ($h5 + (1 << 24)) >> 25;
$h6 += $carry5;
$h5 -= $carry5 << 25;
$carry2 = ($h2 + (1 << 25)) >> 26;
$h3 += $carry2;
$h2 -= $carry2 << 26;
$carry6 = ($h6 + (1 << 25)) >> 26;
$h7 += $carry6;
$h6 -= $carry6 << 26;
$carry3 = ($h3 + (1 << 24)) >> 25;
$h4 += $carry3;
$h3 -= $carry3 << 25;
$carry7 = ($h7 + (1 << 24)) >> 25;
$h8 += $carry7;
$h7 -= $carry7 << 25;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry8 = ($h8 + (1 << 25)) >> 26;
$h9 += $carry8;
$h8 -= $carry8 << 26;
$carry9 = ($h9 + (1 << 24)) >> 25;
$h0 += self::mul($carry9, 19, 5);
$h9 -= $carry9 << 25;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
return self::fe_normalize(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(
(int) $h0,
(int) $h1,
(int) $h2,
(int) $h3,
(int) $h4,
(int) $h5,
(int) $h6,
(int) $h7,
(int) $h8,
(int) $h9
)
)
);
}
/**
* Square and double a field element
*
* h = 2 * f * f
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_sq2(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$f = self::fe_normalize($f);
$f0 = (int) $f[0];
$f1 = (int) $f[1];
$f2 = (int) $f[2];
$f3 = (int) $f[3];
$f4 = (int) $f[4];
$f5 = (int) $f[5];
$f6 = (int) $f[6];
$f7 = (int) $f[7];
$f8 = (int) $f[8];
$f9 = (int) $f[9];
$f0_2 = $f0 << 1;
$f1_2 = $f1 << 1;
$f2_2 = $f2 << 1;
$f3_2 = $f3 << 1;
$f4_2 = $f4 << 1;
$f5_2 = $f5 << 1;
$f6_2 = $f6 << 1;
$f7_2 = $f7 << 1;
$f5_38 = self::mul($f5, 38, 6); /* 1.959375*2^30 */
$f6_19 = self::mul($f6, 19, 5); /* 1.959375*2^30 */
$f7_38 = self::mul($f7, 38, 6); /* 1.959375*2^30 */
$f8_19 = self::mul($f8, 19, 5); /* 1.959375*2^30 */
$f9_38 = self::mul($f9, 38, 6); /* 1.959375*2^30 */
$f0f0 = self::mul($f0, $f0, 24);
$f0f1_2 = self::mul($f0_2, $f1, 24);
$f0f2_2 = self::mul($f0_2, $f2, 24);
$f0f3_2 = self::mul($f0_2, $f3, 24);
$f0f4_2 = self::mul($f0_2, $f4, 24);
$f0f5_2 = self::mul($f0_2, $f5, 24);
$f0f6_2 = self::mul($f0_2, $f6, 24);
$f0f7_2 = self::mul($f0_2, $f7, 24);
$f0f8_2 = self::mul($f0_2, $f8, 24);
$f0f9_2 = self::mul($f0_2, $f9, 24);
$f1f1_2 = self::mul($f1_2, $f1, 24);
$f1f2_2 = self::mul($f1_2, $f2, 24);
$f1f3_4 = self::mul($f1_2, $f3_2, 24);
$f1f4_2 = self::mul($f1_2, $f4, 24);
$f1f5_4 = self::mul($f1_2, $f5_2, 24);
$f1f6_2 = self::mul($f1_2, $f6, 24);
$f1f7_4 = self::mul($f1_2, $f7_2, 24);
$f1f8_2 = self::mul($f1_2, $f8, 24);
$f1f9_76 = self::mul($f9_38, $f1_2, 24);
$f2f2 = self::mul($f2, $f2, 24);
$f2f3_2 = self::mul($f2_2, $f3, 24);
$f2f4_2 = self::mul($f2_2, $f4, 24);
$f2f5_2 = self::mul($f2_2, $f5, 24);
$f2f6_2 = self::mul($f2_2, $f6, 24);
$f2f7_2 = self::mul($f2_2, $f7, 24);
$f2f8_38 = self::mul($f8_19, $f2_2, 25);
$f2f9_38 = self::mul($f9_38, $f2, 24);
$f3f3_2 = self::mul($f3_2, $f3, 24);
$f3f4_2 = self::mul($f3_2, $f4, 24);
$f3f5_4 = self::mul($f3_2, $f5_2, 24);
$f3f6_2 = self::mul($f3_2, $f6, 24);
$f3f7_76 = self::mul($f7_38, $f3_2, 24);
$f3f8_38 = self::mul($f8_19, $f3_2, 24);
$f3f9_76 = self::mul($f9_38, $f3_2, 24);
$f4f4 = self::mul($f4, $f4, 24);
$f4f5_2 = self::mul($f4_2, $f5, 24);
$f4f6_38 = self::mul($f6_19, $f4_2, 25);
$f4f7_38 = self::mul($f7_38, $f4, 24);
$f4f8_38 = self::mul($f8_19, $f4_2, 25);
$f4f9_38 = self::mul($f9_38, $f4, 24);
$f5f5_38 = self::mul($f5_38, $f5, 24);
$f5f6_38 = self::mul($f6_19, $f5_2, 24);
$f5f7_76 = self::mul($f7_38, $f5_2, 24);
$f5f8_38 = self::mul($f8_19, $f5_2, 24);
$f5f9_76 = self::mul($f9_38, $f5_2, 24);
$f6f6_19 = self::mul($f6_19, $f6, 24);
$f6f7_38 = self::mul($f7_38, $f6, 24);
$f6f8_38 = self::mul($f8_19, $f6_2, 25);
$f6f9_38 = self::mul($f9_38, $f6, 24);
$f7f7_38 = self::mul($f7_38, $f7, 24);
$f7f8_38 = self::mul($f8_19, $f7_2, 24);
$f7f9_76 = self::mul($f9_38, $f7_2, 24);
$f8f8_19 = self::mul($f8_19, $f8, 24);
$f8f9_38 = self::mul($f9_38, $f8, 24);
$f9f9_38 = self::mul($f9_38, $f9, 24);
$h0 = (int) ($f0f0 + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38) << 1;
$h1 = (int) ($f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38) << 1;
$h2 = (int) ($f0f2_2 + $f1f1_2 + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19) << 1;
$h3 = (int) ($f0f3_2 + $f1f2_2 + $f4f9_38 + $f5f8_38 + $f6f7_38) << 1;
$h4 = (int) ($f0f4_2 + $f1f3_4 + $f2f2 + $f5f9_76 + $f6f8_38 + $f7f7_38) << 1;
$h5 = (int) ($f0f5_2 + $f1f4_2 + $f2f3_2 + $f6f9_38 + $f7f8_38) << 1;
$h6 = (int) ($f0f6_2 + $f1f5_4 + $f2f4_2 + $f3f3_2 + $f7f9_76 + $f8f8_19) << 1;
$h7 = (int) ($f0f7_2 + $f1f6_2 + $f2f5_2 + $f3f4_2 + $f8f9_38) << 1;
$h8 = (int) ($f0f8_2 + $f1f7_4 + $f2f6_2 + $f3f5_4 + $f4f4 + $f9f9_38) << 1;
$h9 = (int) ($f0f9_2 + $f1f8_2 + $f2f7_2 + $f3f6_2 + $f4f5_2) << 1;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry1 = ($h1 + (1 << 24)) >> 25;
$h2 += $carry1;
$h1 -= $carry1 << 25;
$carry5 = ($h5 + (1 << 24)) >> 25;
$h6 += $carry5;
$h5 -= $carry5 << 25;
$carry2 = ($h2 + (1 << 25)) >> 26;
$h3 += $carry2;
$h2 -= $carry2 << 26;
$carry6 = ($h6 + (1 << 25)) >> 26;
$h7 += $carry6;
$h6 -= $carry6 << 26;
$carry3 = ($h3 + (1 << 24)) >> 25;
$h4 += $carry3;
$h3 -= $carry3 << 25;
$carry7 = ($h7 + (1 << 24)) >> 25;
$h8 += $carry7;
$h7 -= $carry7 << 25;
$carry4 = ($h4 + (1 << 25)) >> 26;
$h5 += $carry4;
$h4 -= $carry4 << 26;
$carry8 = ($h8 + (1 << 25)) >> 26;
$h9 += $carry8;
$h8 -= $carry8 << 26;
$carry9 = ($h9 + (1 << 24)) >> 25;
$h0 += self::mul($carry9, 19, 5);
$h9 -= $carry9 << 25;
$carry0 = ($h0 + (1 << 25)) >> 26;
$h1 += $carry0;
$h0 -= $carry0 << 26;
return self::fe_normalize(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(
(int) $h0,
(int) $h1,
(int) $h2,
(int) $h3,
(int) $h4,
(int) $h5,
(int) $h6,
(int) $h7,
(int) $h8,
(int) $h9
)
)
);
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $Z
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_invert(ParagonIE_Sodium_Core_Curve25519_Fe $Z)
{
$z = clone $Z;
$t0 = self::fe_sq($z);
$t1 = self::fe_sq($t0);
$t1 = self::fe_sq($t1);
$t1 = self::fe_mul($z, $t1);
$t0 = self::fe_mul($t0, $t1);
$t2 = self::fe_sq($t0);
$t1 = self::fe_mul($t1, $t2);
$t2 = self::fe_sq($t1);
for ($i = 1; $i < 5; ++$i) {
$t2 = self::fe_sq($t2);
}
$t1 = self::fe_mul($t2, $t1);
$t2 = self::fe_sq($t1);
for ($i = 1; $i < 10; ++$i) {
$t2 = self::fe_sq($t2);
}
$t2 = self::fe_mul($t2, $t1);
$t3 = self::fe_sq($t2);
for ($i = 1; $i < 20; ++$i) {
$t3 = self::fe_sq($t3);
}
$t2 = self::fe_mul($t3, $t2);
$t2 = self::fe_sq($t2);
for ($i = 1; $i < 10; ++$i) {
$t2 = self::fe_sq($t2);
}
$t1 = self::fe_mul($t2, $t1);
$t2 = self::fe_sq($t1);
for ($i = 1; $i < 50; ++$i) {
$t2 = self::fe_sq($t2);
}
$t2 = self::fe_mul($t2, $t1);
$t3 = self::fe_sq($t2);
for ($i = 1; $i < 100; ++$i) {
$t3 = self::fe_sq($t3);
}
$t2 = self::fe_mul($t3, $t2);
$t2 = self::fe_sq($t2);
for ($i = 1; $i < 50; ++$i) {
$t2 = self::fe_sq($t2);
}
$t1 = self::fe_mul($t2, $t1);
$t1 = self::fe_sq($t1);
for ($i = 1; $i < 5; ++$i) {
$t1 = self::fe_sq($t1);
}
return self::fe_mul($t1, $t0);
}
/**
* @internal You should not use this directly from another application
*
* @ref https://github.com/jedisct1/libsodium/blob/68564326e1e9dc57ef03746f85734232d20ca6fb/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1054-L1106
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $z
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_pow22523(ParagonIE_Sodium_Core_Curve25519_Fe $z)
{
$z = self::fe_normalize($z);
# fe_sq(t0, z);
# fe_sq(t1, t0);
# fe_sq(t1, t1);
# fe_mul(t1, z, t1);
# fe_mul(t0, t0, t1);
# fe_sq(t0, t0);
# fe_mul(t0, t1, t0);
# fe_sq(t1, t0);
$t0 = self::fe_sq($z);
$t1 = self::fe_sq($t0);
$t1 = self::fe_sq($t1);
$t1 = self::fe_mul($z, $t1);
$t0 = self::fe_mul($t0, $t1);
$t0 = self::fe_sq($t0);
$t0 = self::fe_mul($t1, $t0);
$t1 = self::fe_sq($t0);
# for (i = 1; i < 5; ++i) {
# fe_sq(t1, t1);
# }
for ($i = 1; $i < 5; ++$i) {
$t1 = self::fe_sq($t1);
}
# fe_mul(t0, t1, t0);
# fe_sq(t1, t0);
$t0 = self::fe_mul($t1, $t0);
$t1 = self::fe_sq($t0);
# for (i = 1; i < 10; ++i) {
# fe_sq(t1, t1);
# }
for ($i = 1; $i < 10; ++$i) {
$t1 = self::fe_sq($t1);
}
# fe_mul(t1, t1, t0);
# fe_sq(t2, t1);
$t1 = self::fe_mul($t1, $t0);
$t2 = self::fe_sq($t1);
# for (i = 1; i < 20; ++i) {
# fe_sq(t2, t2);
# }
for ($i = 1; $i < 20; ++$i) {
$t2 = self::fe_sq($t2);
}
# fe_mul(t1, t2, t1);
# fe_sq(t1, t1);
$t1 = self::fe_mul($t2, $t1);
$t1 = self::fe_sq($t1);
# for (i = 1; i < 10; ++i) {
# fe_sq(t1, t1);
# }
for ($i = 1; $i < 10; ++$i) {
$t1 = self::fe_sq($t1);
}
# fe_mul(t0, t1, t0);
# fe_sq(t1, t0);
$t0 = self::fe_mul($t1, $t0);
$t1 = self::fe_sq($t0);
# for (i = 1; i < 50; ++i) {
# fe_sq(t1, t1);
# }
for ($i = 1; $i < 50; ++$i) {
$t1 = self::fe_sq($t1);
}
# fe_mul(t1, t1, t0);
# fe_sq(t2, t1);
$t1 = self::fe_mul($t1, $t0);
$t2 = self::fe_sq($t1);
# for (i = 1; i < 100; ++i) {
# fe_sq(t2, t2);
# }
for ($i = 1; $i < 100; ++$i) {
$t2 = self::fe_sq($t2);
}
# fe_mul(t1, t2, t1);
# fe_sq(t1, t1);
$t1 = self::fe_mul($t2, $t1);
$t1 = self::fe_sq($t1);
# for (i = 1; i < 50; ++i) {
# fe_sq(t1, t1);
# }
for ($i = 1; $i < 50; ++$i) {
$t1 = self::fe_sq($t1);
}
# fe_mul(t0, t1, t0);
# fe_sq(t0, t0);
# fe_sq(t0, t0);
# fe_mul(out, t0, z);
$t0 = self::fe_mul($t1, $t0);
$t0 = self::fe_sq($t0);
$t0 = self::fe_sq($t0);
return self::fe_mul($t0, $z);
}
/**
* Subtract two field elements.
*
* h = f - g
*
* Preconditions:
* |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
* |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
*
* Postconditions:
* |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @param ParagonIE_Sodium_Core_Curve25519_Fe $g
* @return ParagonIE_Sodium_Core_Curve25519_Fe
* @psalm-suppress MixedOperand
*/
public static function fe_sub(ParagonIE_Sodium_Core_Curve25519_Fe $f, ParagonIE_Sodium_Core_Curve25519_Fe $g)
{
return self::fe_normalize(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
array(
(int) ($f[0] - $g[0]),
(int) ($f[1] - $g[1]),
(int) ($f[2] - $g[2]),
(int) ($f[3] - $g[3]),
(int) ($f[4] - $g[4]),
(int) ($f[5] - $g[5]),
(int) ($f[6] - $g[6]),
(int) ($f[7] - $g[7]),
(int) ($f[8] - $g[8]),
(int) ($f[9] - $g[9])
)
)
);
}
/**
* Add two group elements.
*
* r = p + q
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_add(
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
) {
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
$r->X = self::fe_add($p->Y, $p->X);
$r->Y = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_mul($r->X, $q->YplusX);
$r->Y = self::fe_mul($r->Y, $q->YminusX);
$r->T = self::fe_mul($q->T2d, $p->T);
$r->X = self::fe_mul($p->Z, $q->Z);
$t0 = self::fe_add($r->X, $r->X);
$r->X = self::fe_sub($r->Z, $r->Y);
$r->Y = self::fe_add($r->Z, $r->Y);
$r->Z = self::fe_add($t0, $r->T);
$r->T = self::fe_sub($t0, $r->T);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @ref https://github.com/jedisct1/libsodium/blob/157c4a80c13b117608aeae12178b2d38825f9f8f/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1185-L1215
* @param string $a
* @return array<int, mixed>
* @throws SodiumException
* @throws TypeError
*/
public static function slide($a)
{
if (self::strlen($a) < 256) {
if (self::strlen($a) < 16) {
$a = str_pad($a, 256, '0', STR_PAD_RIGHT);
}
}
/** @var array<int, int> $r */
$r = array();
/** @var int $i */
for ($i = 0; $i < 256; ++$i) {
$r[$i] = (int) (
1 & (
self::chrToInt($a[(int) ($i >> 3)])
>>
($i & 7)
)
);
}
for ($i = 0;$i < 256;++$i) {
if ($r[$i]) {
for ($b = 1;$b <= 6 && $i + $b < 256;++$b) {
if ($r[$i + $b]) {
if ($r[$i] + ($r[$i + $b] << $b) <= 15) {
$r[$i] += $r[$i + $b] << $b;
$r[$i + $b] = 0;
} elseif ($r[$i] - ($r[$i + $b] << $b) >= -15) {
$r[$i] -= $r[$i + $b] << $b;
for ($k = $i + $b; $k < 256; ++$k) {
if (!$r[$k]) {
$r[$k] = 1;
break;
}
$r[$k] = 0;
}
} else {
break;
}
}
}
}
}
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param string $s
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
* @throws SodiumException
* @throws TypeError
*/
public static function ge_frombytes_negate_vartime($s)
{
static $d = null;
if (!$d) {
$d = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
}
# fe_frombytes(h->Y,s);
# fe_1(h->Z);
$h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
self::fe_0(),
self::fe_frombytes($s),
self::fe_1()
);
# fe_sq(u,h->Y);
# fe_mul(v,u,d);
# fe_sub(u,u,h->Z); /* u = y^2-1 */
# fe_add(v,v,h->Z); /* v = dy^2+1 */
$u = self::fe_sq($h->Y);
/** @var ParagonIE_Sodium_Core_Curve25519_Fe $d */
$v = self::fe_mul($u, $d);
$u = self::fe_sub($u, $h->Z); /* u = y^2 - 1 */
$v = self::fe_add($v, $h->Z); /* v = dy^2 + 1 */
# fe_sq(v3,v);
# fe_mul(v3,v3,v); /* v3 = v^3 */
# fe_sq(h->X,v3);
# fe_mul(h->X,h->X,v);
# fe_mul(h->X,h->X,u); /* x = uv^7 */
$v3 = self::fe_sq($v);
$v3 = self::fe_mul($v3, $v); /* v3 = v^3 */
$h->X = self::fe_sq($v3);
$h->X = self::fe_mul($h->X, $v);
$h->X = self::fe_mul($h->X, $u); /* x = uv^7 */
# fe_pow22523(h->X,h->X); /* x = (uv^7)^((q-5)/8) */
# fe_mul(h->X,h->X,v3);
# fe_mul(h->X,h->X,u); /* x = uv^3(uv^7)^((q-5)/8) */
$h->X = self::fe_pow22523($h->X); /* x = (uv^7)^((q-5)/8) */
$h->X = self::fe_mul($h->X, $v3);
$h->X = self::fe_mul($h->X, $u); /* x = uv^3(uv^7)^((q-5)/8) */
# fe_sq(vxx,h->X);
# fe_mul(vxx,vxx,v);
# fe_sub(check,vxx,u); /* vx^2-u */
$vxx = self::fe_sq($h->X);
$vxx = self::fe_mul($vxx, $v);
$check = self::fe_sub($vxx, $u); /* vx^2 - u */
# if (fe_isnonzero(check)) {
# fe_add(check,vxx,u); /* vx^2+u */
# if (fe_isnonzero(check)) {
# return -1;
# }
# fe_mul(h->X,h->X,sqrtm1);
# }
if (self::fe_isnonzero($check)) {
$check = self::fe_add($vxx, $u); /* vx^2 + u */
if (self::fe_isnonzero($check)) {
throw new RangeException('Internal check failed.');
}
$h->X = self::fe_mul(
$h->X,
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1)
);
}
# if (fe_isnegative(h->X) == (s[31] >> 7)) {
# fe_neg(h->X,h->X);
# }
$i = self::chrToInt($s[31]);
if (self::fe_isnegative($h->X) === ($i >> 7)) {
$h->X = self::fe_neg($h->X);
}
# fe_mul(h->T,h->X,h->Y);
$h->T = self::fe_mul($h->X, $h->Y);
return $h;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_madd(
ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
) {
$r = clone $R;
$r->X = self::fe_add($p->Y, $p->X);
$r->Y = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_mul($r->X, $q->yplusx);
$r->Y = self::fe_mul($r->Y, $q->yminusx);
$r->T = self::fe_mul($q->xy2d, $p->T);
$t0 = self::fe_add(clone $p->Z, clone $p->Z);
$r->X = self::fe_sub($r->Z, $r->Y);
$r->Y = self::fe_add($r->Z, $r->Y);
$r->Z = self::fe_add($t0, $r->T);
$r->T = self::fe_sub($t0, $r->T);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_msub(
ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
) {
$r = clone $R;
$r->X = self::fe_add($p->Y, $p->X);
$r->Y = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_mul($r->X, $q->yminusx);
$r->Y = self::fe_mul($r->Y, $q->yplusx);
$r->T = self::fe_mul($q->xy2d, $p->T);
$t0 = self::fe_add($p->Z, $p->Z);
$r->X = self::fe_sub($r->Z, $r->Y);
$r->Y = self::fe_add($r->Z, $r->Y);
$r->Z = self::fe_sub($t0, $r->T);
$r->T = self::fe_add($t0, $r->T);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
*/
public static function ge_p1p1_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
{
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P2();
$r->X = self::fe_mul($p->X, $p->T);
$r->Y = self::fe_mul($p->Y, $p->Z);
$r->Z = self::fe_mul($p->Z, $p->T);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
*/
public static function ge_p1p1_to_p3(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
{
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();
$r->X = self::fe_mul($p->X, $p->T);
$r->Y = self::fe_mul($p->Y, $p->Z);
$r->Z = self::fe_mul($p->Z, $p->T);
$r->T = self::fe_mul($p->X, $p->Y);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
*/
public static function ge_p2_0()
{
return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
self::fe_0(),
self::fe_1(),
self::fe_1()
);
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_p2_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p)
{
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
$r->X = self::fe_sq($p->X);
$r->Z = self::fe_sq($p->Y);
$r->T = self::fe_sq2($p->Z);
$r->Y = self::fe_add($p->X, $p->Y);
$t0 = self::fe_sq($r->Y);
$r->Y = self::fe_add($r->Z, $r->X);
$r->Z = self::fe_sub($r->Z, $r->X);
$r->X = self::fe_sub($t0, $r->Y);
$r->T = self::fe_sub($r->T, $r->Z);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
*/
public static function ge_p3_0()
{
return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
self::fe_0(),
self::fe_1(),
self::fe_1(),
self::fe_0()
);
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
*/
public static function ge_p3_to_cached(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
{
static $d2 = null;
if ($d2 === null) {
$d2 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d2);
}
/** @var ParagonIE_Sodium_Core_Curve25519_Fe $d2 */
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
$r->YplusX = self::fe_add($p->Y, $p->X);
$r->YminusX = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_copy($p->Z);
$r->T2d = self::fe_mul($p->T, $d2);
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
*/
public static function ge_p3_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
{
return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
self::fe_copy($p->X),
self::fe_copy($p->Y),
self::fe_copy($p->Z)
);
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function ge_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
{
$recip = self::fe_invert($h->Z);
$x = self::fe_mul($h->X, $recip);
$y = self::fe_mul($h->Y, $recip);
$s = self::fe_tobytes($y);
$s[31] = self::intToChr(
self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
);
return $s;
}
/**
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_p3_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
{
$q = self::ge_p3_to_p2($p);
return self::ge_p2_dbl($q);
}
/**
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
*/
public static function ge_precomp_0()
{
return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
self::fe_1(),
self::fe_1(),
self::fe_0()
);
}
/**
* @internal You should not use this directly from another application
*
* @param int $b
* @param int $c
* @return int
*/
public static function equal($b, $c)
{
return (int) ((($b ^ $c) - 1) >> 31) & 1;
}
/**
* @internal You should not use this directly from another application
*
* @param int|string $char
* @return int (1 = yes, 0 = no)
* @throws SodiumException
* @throws TypeError
*/
public static function negative($char)
{
if (is_int($char)) {
return ($char >> 63) & 1;
}
$x = self::chrToInt(self::substr($char, 0, 1));
return (int) ($x >> 63);
}
/**
* Conditional move
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u
* @param int $b
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
*/
public static function cmov(
ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t,
ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u,
$b
) {
if (!is_int($b)) {
throw new InvalidArgumentException('Expected an integer.');
}
return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
self::fe_cmov($t->yplusx, $u->yplusx, $b),
self::fe_cmov($t->yminusx, $u->yminusx, $b),
self::fe_cmov($t->xy2d, $u->xy2d, $b)
);
}
/**
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u
* @param int $b
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
*/
public static function ge_cmov_cached(
ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t,
ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u,
$b
) {
$b &= 1;
$ret = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
$ret->YplusX = self::fe_cmov($t->YplusX, $u->YplusX, $b);
$ret->YminusX = self::fe_cmov($t->YminusX, $u->YminusX, $b);
$ret->Z = self::fe_cmov($t->Z, $u->Z, $b);
$ret->T2d = self::fe_cmov($t->T2d, $u->T2d, $b);
return $ret;
}
/**
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $cached
* @param int $b
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
* @throws SodiumException
*/
public static function ge_cmov8_cached(array $cached, $b)
{
// const unsigned char bnegative = negative(b);
// const unsigned char babs = b - (((-bnegative) & b) * ((signed char) 1 << 1));
$bnegative = self::negative($b);
$babs = $b - (((-$bnegative) & $b) << 1);
// ge25519_cached_0(t);
$t = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
self::fe_1(),
self::fe_1(),
self::fe_1(),
self::fe_0()
);
// ge25519_cmov_cached(t, &cached[0], equal(babs, 1));
// ge25519_cmov_cached(t, &cached[1], equal(babs, 2));
// ge25519_cmov_cached(t, &cached[2], equal(babs, 3));
// ge25519_cmov_cached(t, &cached[3], equal(babs, 4));
// ge25519_cmov_cached(t, &cached[4], equal(babs, 5));
// ge25519_cmov_cached(t, &cached[5], equal(babs, 6));
// ge25519_cmov_cached(t, &cached[6], equal(babs, 7));
// ge25519_cmov_cached(t, &cached[7], equal(babs, 8));
for ($x = 0; $x < 8; ++$x) {
$t = self::ge_cmov_cached($t, $cached[$x], self::equal($babs, $x + 1));
}
// fe25519_copy(minust.YplusX, t->YminusX);
// fe25519_copy(minust.YminusX, t->YplusX);
// fe25519_copy(minust.Z, t->Z);
// fe25519_neg(minust.T2d, t->T2d);
$minust = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
self::fe_copy($t->YminusX),
self::fe_copy($t->YplusX),
self::fe_copy($t->Z),
self::fe_neg($t->T2d)
);
return self::ge_cmov_cached($t, $minust, $bnegative);
}
/**
* @internal You should not use this directly from another application
*
* @param int $pos
* @param int $b
* @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
* @throws SodiumException
* @throws TypeError
* @psalm-suppress MixedArgument
* @psalm-suppress MixedArrayAccess
* @psalm-suppress MixedArrayOffset
*/
public static function ge_select($pos = 0, $b = 0)
{
static $base = null;
if ($base === null) {
$base = array();
/** @var int $i */
foreach (self::$base as $i => $bas) {
for ($j = 0; $j < 8; ++$j) {
$base[$i][$j] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][0]),
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][1]),
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][2])
);
}
}
}
/** @var array<int, array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp>> $base */
if (!is_int($pos)) {
throw new InvalidArgumentException('Position must be an integer');
}
if ($pos < 0 || $pos > 31) {
throw new RangeException('Position is out of range [0, 31]');
}
$bnegative = self::negative($b);
$babs = $b - (((-$bnegative) & $b) << 1);
$t = self::ge_precomp_0();
for ($i = 0; $i < 8; ++$i) {
$t = self::cmov(
$t,
$base[$pos][$i],
self::equal($babs, $i + 1)
);
}
$minusT = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
self::fe_copy($t->yminusx),
self::fe_copy($t->yplusx),
self::fe_neg($t->xy2d)
);
return self::cmov($t, $minusT, $bnegative);
}
/**
* Subtract two group elements.
*
* r = p - q
*
* @internal You should not use this directly from another application
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
*/
public static function ge_sub(
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
) {
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
$r->X = self::fe_add($p->Y, $p->X);
$r->Y = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_mul($r->X, $q->YminusX);
$r->Y = self::fe_mul($r->Y, $q->YplusX);
$r->T = self::fe_mul($q->T2d, $p->T);
$r->X = self::fe_mul($p->Z, $q->Z);
$t0 = self::fe_add($r->X, $r->X);
$r->X = self::fe_sub($r->Z, $r->Y);
$r->Y = self::fe_add($r->Z, $r->Y);
$r->Z = self::fe_sub($t0, $r->T);
$r->T = self::fe_add($t0, $r->T);
return $r;
}
/**
* Convert a group element to a byte string.
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h
* @return string
* @throws SodiumException
* @throws TypeError
*/
public static function ge_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h)
{
$recip = self::fe_invert($h->Z);
$x = self::fe_mul($h->X, $recip);
$y = self::fe_mul($h->Y, $recip);
$s = self::fe_tobytes($y);
$s[31] = self::intToChr(
self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
);
return $s;
}
/**
* @internal You should not use this directly from another application
*
* @param string $a
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
* @param string $b
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
* @throws SodiumException
* @throws TypeError
* @psalm-suppress MixedArgument
* @psalm-suppress MixedArrayAccess
*/
public static function ge_double_scalarmult_vartime(
$a,
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A,
$b
) {
/** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai */
$Ai = array();
/** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp> $Bi */
static $Bi = array();
if (!$Bi) {
for ($i = 0; $i < 8; ++$i) {
$Bi[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][0]),
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][1]),
ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][2])
);
}
}
for ($i = 0; $i < 8; ++$i) {
$Ai[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
self::fe_0(),
self::fe_0(),
self::fe_0(),
self::fe_0()
);
}
# slide(aslide,a);
# slide(bslide,b);
/** @var array<int, int> $aslide */
$aslide = self::slide($a);
/** @var array<int, int> $bslide */
$bslide = self::slide($b);
# ge_p3_to_cached(&Ai[0],A);
# ge_p3_dbl(&t,A); ge_p1p1_to_p3(&A2,&t);
$Ai[0] = self::ge_p3_to_cached($A);
$t = self::ge_p3_dbl($A);
$A2 = self::ge_p1p1_to_p3($t);
# ge_add(&t,&A2,&Ai[0]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[1],&u);
# ge_add(&t,&A2,&Ai[1]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[2],&u);
# ge_add(&t,&A2,&Ai[2]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[3],&u);
# ge_add(&t,&A2,&Ai[3]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[4],&u);
# ge_add(&t,&A2,&Ai[4]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[5],&u);
# ge_add(&t,&A2,&Ai[5]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[6],&u);
# ge_add(&t,&A2,&Ai[6]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[7],&u);
for ($i = 0; $i < 7; ++$i) {
$t = self::ge_add($A2, $Ai[$i]);
$u = self::ge_p1p1_to_p3($t);
$Ai[$i + 1] = self::ge_p3_to_cached($u);
}
# ge_p2_0(r);
$r = self::ge_p2_0();
# for (i = 255;i >= 0;--i) {
# if (aslide[i] || bslide[i]) break;
# }
$i = 255;
for (; $i >= 0; --$i) {
if ($aslide[$i] || $bslide[$i]) {
break;
}
}
# for (;i >= 0;--i) {
for (; $i >= 0; --$i) {
# ge_p2_dbl(&t,r);
$t = self::ge_p2_dbl($r);
# if (aslide[i] > 0) {
if ($aslide[$i] > 0) {
# ge_p1p1_to_p3(&u,&t);
# ge_add(&t,&u,&Ai[aslide[i]/2]);
$u = self::ge_p1p1_to_p3($t);
$t = self::ge_add(
$u,
$Ai[(int) floor($aslide[$i] / 2)]
);
# } else if (aslide[i] < 0) {
} elseif ($aslide[$i] < 0) {
# ge_p1p1_to_p3(&u,&t);
# ge_sub(&t,&u,&Ai[(-aslide[i])/2]);
$u = self::ge_p1p1_to_p3($t);
$t = self::ge_sub(
$u,
$Ai[(int) floor(-$aslide[$i] / 2)]
);
}
# if (bslide[i] > 0) {
if ($bslide[$i] > 0) {
/** @var int $index */
$index = (int) floor($bslide[$i] / 2);
# ge_p1p1_to_p3(&u,&t);
# ge_madd(&t,&u,&Bi[bslide[i]/2]);
$u = self::ge_p1p1_to_p3($t);
$t = self::ge_madd($t, $u, $Bi[$index]);
# } else if (bslide[i] < 0) {
} elseif ($bslide[$i] < 0) {
/** @var int $index */
$index = (int) floor(-$bslide[$i] / 2);
# ge_p1p1_to_p3(&u,&t);
# ge_msub(&t,&u,&Bi[(-bslide[i])/2]);
$u = self::ge_p1p1_to_p3($t);
$t = self::ge_msub($t, $u, $Bi[$index]);
}
# ge_p1p1_to_p2(r,&t);
$r = self::ge_p1p1_to_p2($t);
}
return $r;
}
/**
* @internal You should not use this directly from another application
*
* @param string $a
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
* @throws SodiumException
* @throws TypeError
* @psalm-suppress MixedAssignment
* @psalm-suppress MixedOperand
*/
public static function ge_scalarmult($a, $p)
{
$e = array_fill(0, 64, 0);
/** @var ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $pi */
$pi = array();
// ge25519_p3_to_cached(&pi[1 - 1], p); /* p */
$pi[0] = self::ge_p3_to_cached($p);
// ge25519_p3_dbl(&t2, p);
// ge25519_p1p1_to_p3(&p2, &t2);
// ge25519_p3_to_cached(&pi[2 - 1], &p2); /* 2p = 2*p */
$t2 = self::ge_p3_dbl($p);
$p2 = self::ge_p1p1_to_p3($t2);
$pi[1] = self::ge_p3_to_cached($p2);
// ge25519_add_cached(&t3, p, &pi[2 - 1]);
// ge25519_p1p1_to_p3(&p3, &t3);
// ge25519_p3_to_cached(&pi[3 - 1], &p3); /* 3p = 2p+p */
$t3 = self::ge_add($p, $pi[1]);
$p3 = self::ge_p1p1_to_p3($t3);
$pi[2] = self::ge_p3_to_cached($p3);
// ge25519_p3_dbl(&t4, &p2);
// ge25519_p1p1_to_p3(&p4, &t4);
// ge25519_p3_to_cached(&pi[4 - 1], &p4); /* 4p = 2*2p */
$t4 = self::ge_p3_dbl($p2);
$p4 = self::ge_p1p1_to_p3($t4);
$pi[3] = self::ge_p3_to_cached($p4);
// ge25519_add_cached(&t5, p, &pi[4 - 1]);
// ge25519_p1p1_to_p3(&p5, &t5);
// ge25519_p3_to_cached(&pi[5 - 1], &p5); /* 5p = 4p+p */
$t5 = self::ge_add($p, $pi[3]);
$p5 = self::ge_p1p1_to_p3($t5);
$pi[4] = self::ge_p3_to_cached($p5);
// ge25519_p3_dbl(&t6, &p3);
// ge25519_p1p1_to_p3(&p6, &t6);
// ge25519_p3_to_cached(&pi[6 - 1], &p6); /* 6p = 2*3p */
$t6 = self::ge_p3_dbl($p3);
$p6 = self::ge_p1p1_to_p3($t6);
$pi[5] = self::ge_p3_to_cached($p6);
// ge25519_add_cached(&t7, p, &pi[6 - 1]);
// ge25519_p1p1_to_p3(&p7, &t7);
// ge25519_p3_to_cached(&pi[7 - 1], &p7); /* 7p = 6p+p */
$t7 = self::ge_add($p, $pi[5]);
$p7 = self::ge_p1p1_to_p3($t7);
$pi[6] = self::ge_p3_to_cached($p7);
// ge25519_p3_dbl(&t8, &p4);
// ge25519_p1p1_to_p3(&p8, &t8);
// ge25519_p3_to_cached(&pi[8 - 1], &p8); /* 8p = 2*4p */
$t8 = self::ge_p3_dbl($p4);
$p8 = self::ge_p1p1_to_p3($t8);
$pi[7] = self::ge_p3_to_cached($p8);
// for (i = 0; i < 32; ++i) {
// e[2 * i + 0] = (a[i] >> 0) & 15;
// e[2 * i + 1] = (a[i] >> 4) & 15;
// }
for ($i = 0; $i < 32; ++$i) {
$e[($i << 1) ] = self::chrToInt($a[$i]) & 15;
$e[($i << 1) + 1] = (self::chrToInt($a[$i]) >> 4) & 15;
}
// /* each e[i] is between 0 and 15 */
// /* e[63] is between 0 and 7 */
// carry = 0;
// for (i = 0; i < 63; ++i) {
// e[i] += carry;
// carry = e[i] + 8;
// carry >>= 4;
// e[i] -= carry * ((signed char) 1 << 4);
// }
$carry = 0;
for ($i = 0; $i < 63; ++$i) {
$e[$i] += $carry;
$carry = $e[$i] + 8;
$carry >>= 4;
$e[$i] -= $carry << 4;
}
// e[63] += carry;
// /* each e[i] is between -8 and 8 */
$e[63] += $carry;
// ge25519_p3_0(h);
$h = self::ge_p3_0();
// for (i = 63; i != 0; i--) {
for ($i = 63; $i != 0; --$i) {
// ge25519_cmov8_cached(&t, pi, e[i]);
$t = self::ge_cmov8_cached($pi, $e[$i]);
// ge25519_add_cached(&r, h, &t);
$r = self::ge_add($h, $t);
// ge25519_p1p1_to_p2(&s, &r);
// ge25519_p2_dbl(&r, &s);
// ge25519_p1p1_to_p2(&s, &r);
// ge25519_p2_dbl(&r, &s);
// ge25519_p1p1_to_p2(&s, &r);
// ge25519_p2_dbl(&r, &s);
// ge25519_p1p1_to_p2(&s, &r);
// ge25519_p2_dbl(&r, &s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
// ge25519_p1p1_to_p3(h, &r); /* *16 */
$h = self::ge_p1p1_to_p3($r); /* *16 */
}
// ge25519_cmov8_cached(&t, pi, e[i]);
// ge25519_add_cached(&r, h, &t);
// ge25519_p1p1_to_p3(h, &r);
$t = self::ge_cmov8_cached($pi, $e[0]);
$r = self::ge_add($h, $t);
return self::ge_p1p1_to_p3($r);
}
/**
* @internal You should not use this directly from another application
*
* @param string $a
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
* @throws SodiumException
* @throws TypeError
* @psalm-suppress MixedAssignment
* @psalm-suppress MixedOperand
*/
public static function ge_scalarmult_base($a)
{
/** @var array<int, int> $e */
$e = array();
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
for ($i = 0; $i < 32; ++$i) {
$dbl = (int) $i << 1;
$e[$dbl] = (int) self::chrToInt($a[$i]) & 15;
$e[$dbl + 1] = (int) (self::chrToInt($a[$i]) >> 4) & 15;
}
$carry = 0;
for ($i = 0; $i < 63; ++$i) {
$e[$i] += $carry;
$carry = $e[$i] + 8;
$carry >>= 4;
$e[$i] -= $carry << 4;
}
$e[63] += (int) $carry;
$h = self::ge_p3_0();
for ($i = 1; $i < 64; $i += 2) {
$t = self::ge_select((int) floor($i / 2), (int) $e[$i]);
$r = self::ge_madd($r, $h, $t);
$h = self::ge_p1p1_to_p3($r);
}
$r = self::ge_p3_dbl($h);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$s = self::ge_p1p1_to_p2($r);
$r = self::ge_p2_dbl($s);
$h = self::ge_p1p1_to_p3($r);
for ($i = 0; $i < 64; $i += 2) {
$t = self::ge_select($i >> 1, (int) $e[$i]);
$r = self::ge_madd($r, $h, $t);
$h = self::ge_p1p1_to_p3($r);
}
return $h;
}
/**
* Calculates (ab + c) mod l
* where l = 2^252 + 27742317777372353535851937790883648493
*
* @internal You should not use this directly from another application
*
* @param string $a
* @param string $b
* @param string $c
* @return string
* @throws TypeError
*/
public static function sc_muladd($a, $b, $c)
{
$a0 = 2097151 & self::load_3(self::substr($a, 0, 3));
$a1 = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
$a2 = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
$a3 = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
$a4 = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
$a5 = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
$a6 = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
$a7 = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
$a8 = 2097151 & self::load_3(self::substr($a, 21, 3));
$a9 = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
$a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
$a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);
$b0 = 2097151 & self::load_3(self::substr($b, 0, 3));
$b1 = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
$b2 = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
$b3 = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
$b4 = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
$b5 = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
$b6 = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
$b7 = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
$b8 = 2097151 & self::load_3(self::substr($b, 21, 3));
$b9 = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
$b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
$b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);
$c0 = 2097151 & self::load_3(self::substr($c, 0, 3));
$c1 = 2097151 & (self::load_4(self::substr($c, 2, 4)) >> 5);
$c2 = 2097151 & (self::load_3(self::substr($c, 5, 3)) >> 2);
$c3 = 2097151 & (self::load_4(self::substr($c, 7, 4)) >> 7);
$c4 = 2097151 & (self::load_4(self::substr($c, 10, 4)) >> 4);
$c5 = 2097151 & (self::load_3(self::substr($c, 13, 3)) >> 1);
$c6 = 2097151 & (self::load_4(self::substr($c, 15, 4)) >> 6);
$c7 = 2097151 & (self::load_3(self::substr($c, 18, 3)) >> 3);
$c8 = 2097151 & self::load_3(self::substr($c, 21, 3));
$c9 = 2097151 & (self::load_4(self::substr($c, 23, 4)) >> 5);
$c10 = 2097151 & (self::load_3(self::substr($c, 26, 3)) >> 2);
$c11 = (self::load_4(self::substr($c, 28, 4)) >> 7);
/* Can't really avoid the pyramid here: */
$s0 = $c0 + self::mul($a0, $b0, 24);
$s1 = $c1 + self::mul($a0, $b1, 24) + self::mul($a1, $b0, 24);
$s2 = $c2 + self::mul($a0, $b2, 24) + self::mul($a1, $b1, 24) + self::mul($a2, $b0, 24);
$s3 = $c3 + self::mul($a0, $b3, 24) + self::mul($a1, $b2, 24) + self::mul($a2, $b1, 24) + self::mul($a3, $b0, 24);
$s4 = $c4 + self::mul($a0, $b4, 24) + self::mul($a1, $b3, 24) + self::mul($a2, $b2, 24) + self::mul($a3, $b1, 24) +
self::mul($a4, $b0, 24);
$s5 = $c5 + self::mul($a0, $b5, 24) + self::mul($a1, $b4, 24) + self::mul($a2, $b3, 24) + self::mul($a3, $b2, 24) +
self::mul($a4, $b1, 24) + self::mul($a5, $b0, 24);
$s6 = $c6 + self::mul($a0, $b6, 24) + self::mul($a1, $b5, 24) + self::mul($a2, $b4, 24) + self::mul($a3, $b3, 24) +
self::mul($a4, $b2, 24) + self::mul($a5, $b1, 24) + self::mul($a6, $b0, 24);
$s7 = $c7 + self::mul($a0, $b7, 24) + self::mul($a1, $b6, 24) + self::mul($a2, $b5, 24) + self::mul($a3, $b4, 24) +
self::mul($a4, $b3, 24) + self::mul($a5, $b2, 24) + self::mul($a6, $b1, 24) + self::mul($a7, $b0, 24);
$s8 = $c8 + self::mul($a0, $b8, 24) + self::mul($a1, $b7, 24) + self::mul($a2, $b6, 24) + self::mul($a3, $b5, 24) +
self::mul($a4, $b4, 24) + self::mul($a5, $b3, 24) + self::mul($a6, $b2, 24) + self::mul($a7, $b1, 24) +
self::mul($a8, $b0, 24);
$s9 = $c9 + self::mul($a0, $b9, 24) + self::mul($a1, $b8, 24) + self::mul($a2, $b7, 24) + self::mul($a3, $b6, 24) +
self::mul($a4, $b5, 24) + self::mul($a5, $b4, 24) + self::mul($a6, $b3, 24) + self::mul($a7, $b2, 24) +
self::mul($a8, $b1, 24) + self::mul($a9, $b0, 24);
$s10 = $c10 + self::mul($a0, $b10, 24) + self::mul($a1, $b9, 24) + self::mul($a2, $b8, 24) + self::mul($a3, $b7, 24) +
self::mul($a4, $b6, 24) + self::mul($a5, $b5, 24) + self::mul($a6, $b4, 24) + self::mul($a7, $b3, 24) +
self::mul($a8, $b2, 24) + self::mul($a9, $b1, 24) + self::mul($a10, $b0, 24);
$s11 = $c11 + self::mul($a0, $b11, 24) + self::mul($a1, $b10, 24) + self::mul($a2, $b9, 24) + self::mul($a3, $b8, 24) +
self::mul($a4, $b7, 24) + self::mul($a5, $b6, 24) + self::mul($a6, $b5, 24) + self::mul($a7, $b4, 24) +
self::mul($a8, $b3, 24) + self::mul($a9, $b2, 24) + self::mul($a10, $b1, 24) + self::mul($a11, $b0, 24);
$s12 = self::mul($a1, $b11, 24) + self::mul($a2, $b10, 24) + self::mul($a3, $b9, 24) + self::mul($a4, $b8, 24) +
self::mul($a5, $b7, 24) + self::mul($a6, $b6, 24) + self::mul($a7, $b5, 24) + self::mul($a8, $b4, 24) +
self::mul($a9, $b3, 24) + self::mul($a10, $b2, 24) + self::mul($a11, $b1, 24);
$s13 = self::mul($a2, $b11, 24) + self::mul($a3, $b10, 24) + self::mul($a4, $b9, 24) + self::mul($a5, $b8, 24) +
self::mul($a6, $b7, 24) + self::mul($a7, $b6, 24) + self::mul($a8, $b5, 24) + self::mul($a9, $b4, 24) +
self::mul($a10, $b3, 24) + self::mul($a11, $b2, 24);
$s14 = self::mul($a3, $b11, 24) + self::mul($a4, $b10, 24) + self::mul($a5, $b9, 24) + self::mul($a6, $b8, 24) +
self::mul($a7, $b7, 24) + self::mul($a8, $b6, 24) + self::mul($a9, $b5, 24) + self::mul($a10, $b4, 24) +
self::mul($a11, $b3, 24);
$s15 = self::mul($a4, $b11, 24) + self::mul($a5, $b10, 24) + self::mul($a6, $b9, 24) + self::mul($a7, $b8, 24) +
self::mul($a8, $b7, 24) + self::mul($a9, $b6, 24) + self::mul($a10, $b5, 24) + self::mul($a11, $b4, 24);
$s16 = self::mul($a5, $b11, 24) + self::mul($a6, $b10, 24) + self::mul($a7, $b9, 24) + self::mul($a8, $b8, 24) +
self::mul($a9, $b7, 24) + self::mul($a10, $b6, 24) + self::mul($a11, $b5, 24);
$s17 = self::mul($a6, $b11, 24) + self::mul($a7, $b10, 24) + self::mul($a8, $b9, 24) + self::mul($a9, $b8, 24) +
self::mul($a10, $b7, 24) + self::mul($a11, $b6, 24);
$s18 = self::mul($a7, $b11, 24) + self::mul($a8, $b10, 24) + self::mul($a9, $b9, 24) + self::mul($a10, $b8, 24) +
self::mul($a11, $b7, 24);
$s19 = self::mul($a8, $b11, 24) + self::mul($a9, $b10, 24) + self::mul($a10, $b9, 24) + self::mul($a11, $b8, 24);
$s20 = self::mul($a9, $b11, 24) + self::mul($a10, $b10, 24) + self::mul($a11, $b9, 24);
$s21 = self::mul($a10, $b11, 24) + self::mul($a11, $b10, 24);
$s22 = self::mul($a11, $b11, 24);
$s23 = 0;
$carry0 = ($s0 + (1 << 20)) >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry2 = ($s2 + (1 << 20)) >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry4 = ($s4 + (1 << 20)) >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry12 = ($s12 + (1 << 20)) >> 21;
$s13 += $carry12;
$s12 -= $carry12 << 21;
$carry14 = ($s14 + (1 << 20)) >> 21;
$s15 += $carry14;
$s14 -= $carry14 << 21;
$carry16 = ($s16 + (1 << 20)) >> 21;
$s17 += $carry16;
$s16 -= $carry16 << 21;
$carry18 = ($s18 + (1 << 20)) >> 21;
$s19 += $carry18;
$s18 -= $carry18 << 21;
$carry20 = ($s20 + (1 << 20)) >> 21;
$s21 += $carry20;
$s20 -= $carry20 << 21;
$carry22 = ($s22 + (1 << 20)) >> 21;
$s23 += $carry22;
$s22 -= $carry22 << 21;
$carry1 = ($s1 + (1 << 20)) >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry3 = ($s3 + (1 << 20)) >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry5 = ($s5 + (1 << 20)) >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$carry13 = ($s13 + (1 << 20)) >> 21;
$s14 += $carry13;
$s13 -= $carry13 << 21;
$carry15 = ($s15 + (1 << 20)) >> 21;
$s16 += $carry15;
$s15 -= $carry15 << 21;
$carry17 = ($s17 + (1 << 20)) >> 21;
$s18 += $carry17;
$s17 -= $carry17 << 21;
$carry19 = ($s19 + (1 << 20)) >> 21;
$s20 += $carry19;
$s19 -= $carry19 << 21;
$carry21 = ($s21 + (1 << 20)) >> 21;
$s22 += $carry21;
$s21 -= $carry21 << 21;
$s11 += self::mul($s23, 666643, 20);
$s12 += self::mul($s23, 470296, 19);
$s13 += self::mul($s23, 654183, 20);
$s14 -= self::mul($s23, 997805, 20);
$s15 += self::mul($s23, 136657, 18);
$s16 -= self::mul($s23, 683901, 20);
$s10 += self::mul($s22, 666643, 20);
$s11 += self::mul($s22, 470296, 19);
$s12 += self::mul($s22, 654183, 20);
$s13 -= self::mul($s22, 997805, 20);
$s14 += self::mul($s22, 136657, 18);
$s15 -= self::mul($s22, 683901, 20);
$s9 += self::mul($s21, 666643, 20);
$s10 += self::mul($s21, 470296, 19);
$s11 += self::mul($s21, 654183, 20);
$s12 -= self::mul($s21, 997805, 20);
$s13 += self::mul($s21, 136657, 18);
$s14 -= self::mul($s21, 683901, 20);
$s8 += self::mul($s20, 666643, 20);
$s9 += self::mul($s20, 470296, 19);
$s10 += self::mul($s20, 654183, 20);
$s11 -= self::mul($s20, 997805, 20);
$s12 += self::mul($s20, 136657, 18);
$s13 -= self::mul($s20, 683901, 20);
$s7 += self::mul($s19, 666643, 20);
$s8 += self::mul($s19, 470296, 19);
$s9 += self::mul($s19, 654183, 20);
$s10 -= self::mul($s19, 997805, 20);
$s11 += self::mul($s19, 136657, 18);
$s12 -= self::mul($s19, 683901, 20);
$s6 += self::mul($s18, 666643, 20);
$s7 += self::mul($s18, 470296, 19);
$s8 += self::mul($s18, 654183, 20);
$s9 -= self::mul($s18, 997805, 20);
$s10 += self::mul($s18, 136657, 18);
$s11 -= self::mul($s18, 683901, 20);
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry12 = ($s12 + (1 << 20)) >> 21;
$s13 += $carry12;
$s12 -= $carry12 << 21;
$carry14 = ($s14 + (1 << 20)) >> 21;
$s15 += $carry14;
$s14 -= $carry14 << 21;
$carry16 = ($s16 + (1 << 20)) >> 21;
$s17 += $carry16;
$s16 -= $carry16 << 21;
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$carry13 = ($s13 + (1 << 20)) >> 21;
$s14 += $carry13;
$s13 -= $carry13 << 21;
$carry15 = ($s15 + (1 << 20)) >> 21;
$s16 += $carry15;
$s15 -= $carry15 << 21;
$s5 += self::mul($s17, 666643, 20);
$s6 += self::mul($s17, 470296, 19);
$s7 += self::mul($s17, 654183, 20);
$s8 -= self::mul($s17, 997805, 20);
$s9 += self::mul($s17, 136657, 18);
$s10 -= self::mul($s17, 683901, 20);
$s4 += self::mul($s16, 666643, 20);
$s5 += self::mul($s16, 470296, 19);
$s6 += self::mul($s16, 654183, 20);
$s7 -= self::mul($s16, 997805, 20);
$s8 += self::mul($s16, 136657, 18);
$s9 -= self::mul($s16, 683901, 20);
$s3 += self::mul($s15, 666643, 20);
$s4 += self::mul($s15, 470296, 19);
$s5 += self::mul($s15, 654183, 20);
$s6 -= self::mul($s15, 997805, 20);
$s7 += self::mul($s15, 136657, 18);
$s8 -= self::mul($s15, 683901, 20);
$s2 += self::mul($s14, 666643, 20);
$s3 += self::mul($s14, 470296, 19);
$s4 += self::mul($s14, 654183, 20);
$s5 -= self::mul($s14, 997805, 20);
$s6 += self::mul($s14, 136657, 18);
$s7 -= self::mul($s14, 683901, 20);
$s1 += self::mul($s13, 666643, 20);
$s2 += self::mul($s13, 470296, 19);
$s3 += self::mul($s13, 654183, 20);
$s4 -= self::mul($s13, 997805, 20);
$s5 += self::mul($s13, 136657, 18);
$s6 -= self::mul($s13, 683901, 20);
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
$carry0 = ($s0 + (1 << 20)) >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry2 = ($s2 + (1 << 20)) >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry4 = ($s4 + (1 << 20)) >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry1 = ($s1 + (1 << 20)) >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry3 = ($s3 + (1 << 20)) >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry5 = ($s5 + (1 << 20)) >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry11 = $s11 >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
/**
* @var array<int, int>
*/
$arr = array(
(int) (0xff & ($s0 >> 0)),
(int) (0xff & ($s0 >> 8)),
(int) (0xff & (($s0 >> 16) | $s1 << 5)),
(int) (0xff & ($s1 >> 3)),
(int) (0xff & ($s1 >> 11)),
(int) (0xff & (($s1 >> 19) | $s2 << 2)),
(int) (0xff & ($s2 >> 6)),
(int) (0xff & (($s2 >> 14) | $s3 << 7)),
(int) (0xff & ($s3 >> 1)),
(int) (0xff & ($s3 >> 9)),
(int) (0xff & (($s3 >> 17) | $s4 << 4)),
(int) (0xff & ($s4 >> 4)),
(int) (0xff & ($s4 >> 12)),
(int) (0xff & (($s4 >> 20) | $s5 << 1)),
(int) (0xff & ($s5 >> 7)),
(int) (0xff & (($s5 >> 15) | $s6 << 6)),
(int) (0xff & ($s6 >> 2)),
(int) (0xff & ($s6 >> 10)),
(int) (0xff & (($s6 >> 18) | $s7 << 3)),
(int) (0xff & ($s7 >> 5)),
(int) (0xff & ($s7 >> 13)),
(int) (0xff & ($s8 >> 0)),
(int) (0xff & ($s8 >> 8)),
(int) (0xff & (($s8 >> 16) | $s9 << 5)),
(int) (0xff & ($s9 >> 3)),
(int) (0xff & ($s9 >> 11)),
(int) (0xff & (($s9 >> 19) | $s10 << 2)),
(int) (0xff & ($s10 >> 6)),
(int) (0xff & (($s10 >> 14) | $s11 << 7)),
(int) (0xff & ($s11 >> 1)),
(int) (0xff & ($s11 >> 9)),
0xff & ($s11 >> 17)
);
return self::intArrayToString($arr);
}
/**
* @internal You should not use this directly from another application
*
* @param string $s
* @return string
* @throws TypeError
*/
public static function sc_reduce($s)
{
$s0 = 2097151 & self::load_3(self::substr($s, 0, 3));
$s1 = 2097151 & (self::load_4(self::substr($s, 2, 4)) >> 5);
$s2 = 2097151 & (self::load_3(self::substr($s, 5, 3)) >> 2);
$s3 = 2097151 & (self::load_4(self::substr($s, 7, 4)) >> 7);
$s4 = 2097151 & (self::load_4(self::substr($s, 10, 4)) >> 4);
$s5 = 2097151 & (self::load_3(self::substr($s, 13, 3)) >> 1);
$s6 = 2097151 & (self::load_4(self::substr($s, 15, 4)) >> 6);
$s7 = 2097151 & (self::load_3(self::substr($s, 18, 4)) >> 3);
$s8 = 2097151 & self::load_3(self::substr($s, 21, 3));
$s9 = 2097151 & (self::load_4(self::substr($s, 23, 4)) >> 5);
$s10 = 2097151 & (self::load_3(self::substr($s, 26, 3)) >> 2);
$s11 = 2097151 & (self::load_4(self::substr($s, 28, 4)) >> 7);
$s12 = 2097151 & (self::load_4(self::substr($s, 31, 4)) >> 4);
$s13 = 2097151 & (self::load_3(self::substr($s, 34, 3)) >> 1);
$s14 = 2097151 & (self::load_4(self::substr($s, 36, 4)) >> 6);
$s15 = 2097151 & (self::load_3(self::substr($s, 39, 4)) >> 3);
$s16 = 2097151 & self::load_3(self::substr($s, 42, 3));
$s17 = 2097151 & (self::load_4(self::substr($s, 44, 4)) >> 5);
$s18 = 2097151 & (self::load_3(self::substr($s, 47, 3)) >> 2);
$s19 = 2097151 & (self::load_4(self::substr($s, 49, 4)) >> 7);
$s20 = 2097151 & (self::load_4(self::substr($s, 52, 4)) >> 4);
$s21 = 2097151 & (self::load_3(self::substr($s, 55, 3)) >> 1);
$s22 = 2097151 & (self::load_4(self::substr($s, 57, 4)) >> 6);
$s23 = 0x1fffffff & (self::load_4(self::substr($s, 60, 4)) >> 3);
$s11 += self::mul($s23, 666643, 20);
$s12 += self::mul($s23, 470296, 19);
$s13 += self::mul($s23, 654183, 20);
$s14 -= self::mul($s23, 997805, 20);
$s15 += self::mul($s23, 136657, 18);
$s16 -= self::mul($s23, 683901, 20);
$s10 += self::mul($s22, 666643, 20);
$s11 += self::mul($s22, 470296, 19);
$s12 += self::mul($s22, 654183, 20);
$s13 -= self::mul($s22, 997805, 20);
$s14 += self::mul($s22, 136657, 18);
$s15 -= self::mul($s22, 683901, 20);
$s9 += self::mul($s21, 666643, 20);
$s10 += self::mul($s21, 470296, 19);
$s11 += self::mul($s21, 654183, 20);
$s12 -= self::mul($s21, 997805, 20);
$s13 += self::mul($s21, 136657, 18);
$s14 -= self::mul($s21, 683901, 20);
$s8 += self::mul($s20, 666643, 20);
$s9 += self::mul($s20, 470296, 19);
$s10 += self::mul($s20, 654183, 20);
$s11 -= self::mul($s20, 997805, 20);
$s12 += self::mul($s20, 136657, 18);
$s13 -= self::mul($s20, 683901, 20);
$s7 += self::mul($s19, 666643, 20);
$s8 += self::mul($s19, 470296, 19);
$s9 += self::mul($s19, 654183, 20);
$s10 -= self::mul($s19, 997805, 20);
$s11 += self::mul($s19, 136657, 18);
$s12 -= self::mul($s19, 683901, 20);
$s6 += self::mul($s18, 666643, 20);
$s7 += self::mul($s18, 470296, 19);
$s8 += self::mul($s18, 654183, 20);
$s9 -= self::mul($s18, 997805, 20);
$s10 += self::mul($s18, 136657, 18);
$s11 -= self::mul($s18, 683901, 20);
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry12 = ($s12 + (1 << 20)) >> 21;
$s13 += $carry12;
$s12 -= $carry12 << 21;
$carry14 = ($s14 + (1 << 20)) >> 21;
$s15 += $carry14;
$s14 -= $carry14 << 21;
$carry16 = ($s16 + (1 << 20)) >> 21;
$s17 += $carry16;
$s16 -= $carry16 << 21;
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$carry13 = ($s13 + (1 << 20)) >> 21;
$s14 += $carry13;
$s13 -= $carry13 << 21;
$carry15 = ($s15 + (1 << 20)) >> 21;
$s16 += $carry15;
$s15 -= $carry15 << 21;
$s5 += self::mul($s17, 666643, 20);
$s6 += self::mul($s17, 470296, 19);
$s7 += self::mul($s17, 654183, 20);
$s8 -= self::mul($s17, 997805, 20);
$s9 += self::mul($s17, 136657, 18);
$s10 -= self::mul($s17, 683901, 20);
$s4 += self::mul($s16, 666643, 20);
$s5 += self::mul($s16, 470296, 19);
$s6 += self::mul($s16, 654183, 20);
$s7 -= self::mul($s16, 997805, 20);
$s8 += self::mul($s16, 136657, 18);
$s9 -= self::mul($s16, 683901, 20);
$s3 += self::mul($s15, 666643, 20);
$s4 += self::mul($s15, 470296, 19);
$s5 += self::mul($s15, 654183, 20);
$s6 -= self::mul($s15, 997805, 20);
$s7 += self::mul($s15, 136657, 18);
$s8 -= self::mul($s15, 683901, 20);
$s2 += self::mul($s14, 666643, 20);
$s3 += self::mul($s14, 470296, 19);
$s4 += self::mul($s14, 654183, 20);
$s5 -= self::mul($s14, 997805, 20);
$s6 += self::mul($s14, 136657, 18);
$s7 -= self::mul($s14, 683901, 20);
$s1 += self::mul($s13, 666643, 20);
$s2 += self::mul($s13, 470296, 19);
$s3 += self::mul($s13, 654183, 20);
$s4 -= self::mul($s13, 997805, 20);
$s5 += self::mul($s13, 136657, 18);
$s6 -= self::mul($s13, 683901, 20);
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
$carry0 = ($s0 + (1 << 20)) >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry2 = ($s2 + (1 << 20)) >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry4 = ($s4 + (1 << 20)) >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry1 = ($s1 + (1 << 20)) >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry3 = ($s3 + (1 << 20)) >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry5 = ($s5 + (1 << 20)) >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$carry11 = $s11 >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
/**
* @var array<int, int>
*/
$arr = array(
(int) ($s0 >> 0),
(int) ($s0 >> 8),
(int) (($s0 >> 16) | $s1 << 5),
(int) ($s1 >> 3),
(int) ($s1 >> 11),
(int) (($s1 >> 19) | $s2 << 2),
(int) ($s2 >> 6),
(int) (($s2 >> 14) | $s3 << 7),
(int) ($s3 >> 1),
(int) ($s3 >> 9),
(int) (($s3 >> 17) | $s4 << 4),
(int) ($s4 >> 4),
(int) ($s4 >> 12),
(int) (($s4 >> 20) | $s5 << 1),
(int) ($s5 >> 7),
(int) (($s5 >> 15) | $s6 << 6),
(int) ($s6 >> 2),
(int) ($s6 >> 10),
(int) (($s6 >> 18) | $s7 << 3),
(int) ($s7 >> 5),
(int) ($s7 >> 13),
(int) ($s8 >> 0),
(int) ($s8 >> 8),
(int) (($s8 >> 16) | $s9 << 5),
(int) ($s9 >> 3),
(int) ($s9 >> 11),
(int) (($s9 >> 19) | $s10 << 2),
(int) ($s10 >> 6),
(int) (($s10 >> 14) | $s11 << 7),
(int) ($s11 >> 1),
(int) ($s11 >> 9),
(int) $s11 >> 17
);
return self::intArrayToString($arr);
}
/**
* multiply by the order of the main subgroup l = 2^252+27742317777372353535851937790883648493
*
* @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
* @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
*/
public static function ge_mul_l(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A)
{
$aslide = array(
13, 0, 0, 0, 0, -1, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, -5, 0, 0, 0,
0, 0, 0, -3, 0, 0, 0, 0, -13, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0,
0, 0, 0, -13, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0,
0, 0, 11, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, -1,
0, 0, 0, 0, 3, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0,
0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 5, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
);
/** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai size 8 */
$Ai = array();
# ge_p3_to_cached(&Ai[0], A);
$Ai[0] = self::ge_p3_to_cached($A);
# ge_p3_dbl(&t, A);
$t = self::ge_p3_dbl($A);
# ge_p1p1_to_p3(&A2, &t);
$A2 = self::ge_p1p1_to_p3($t);
for ($i = 1; $i < 8; ++$i) {
# ge_add(&t, &A2, &Ai[0]);
$t = self::ge_add($A2, $Ai[$i - 1]);
# ge_p1p1_to_p3(&u, &t);
$u = self::ge_p1p1_to_p3($t);
# ge_p3_to_cached(&Ai[i], &u);
$Ai[$i] = self::ge_p3_to_cached($u);
}
$r = self::ge_p3_0();
for ($i = 252; $i >= 0; --$i) {
$t = self::ge_p3_dbl($r);
if ($aslide[$i] > 0) {
# ge_p1p1_to_p3(&u, &t);
$u = self::ge_p1p1_to_p3($t);
# ge_add(&t, &u, &Ai[aslide[i] / 2]);
$t = self::ge_add($u, $Ai[(int)($aslide[$i] / 2)]);
} elseif ($aslide[$i] < 0) {
# ge_p1p1_to_p3(&u, &t);
$u = self::ge_p1p1_to_p3($t);
# ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
$t = self::ge_sub($u, $Ai[(int)(-$aslide[$i] / 2)]);
}
}
# ge_p1p1_to_p3(r, &t);
return self::ge_p1p1_to_p3($t);
}
/**
* @param string $a
* @param string $b
* @return string
*/
public static function sc25519_mul($a, $b)
{
// int64_t a0 = 2097151 & load_3(a);
// int64_t a1 = 2097151 & (load_4(a + 2) >> 5);
// int64_t a2 = 2097151 & (load_3(a + 5) >> 2);
// int64_t a3 = 2097151 & (load_4(a + 7) >> 7);
// int64_t a4 = 2097151 & (load_4(a + 10) >> 4);
// int64_t a5 = 2097151 & (load_3(a + 13) >> 1);
// int64_t a6 = 2097151 & (load_4(a + 15) >> 6);
// int64_t a7 = 2097151 & (load_3(a + 18) >> 3);
// int64_t a8 = 2097151 & load_3(a + 21);
// int64_t a9 = 2097151 & (load_4(a + 23) >> 5);
// int64_t a10 = 2097151 & (load_3(a + 26) >> 2);
// int64_t a11 = (load_4(a + 28) >> 7);
$a0 = 2097151 & self::load_3(self::substr($a, 0, 3));
$a1 = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
$a2 = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
$a3 = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
$a4 = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
$a5 = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
$a6 = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
$a7 = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
$a8 = 2097151 & self::load_3(self::substr($a, 21, 3));
$a9 = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
$a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
$a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);
// int64_t b0 = 2097151 & load_3(b);
// int64_t b1 = 2097151 & (load_4(b + 2) >> 5);
// int64_t b2 = 2097151 & (load_3(b + 5) >> 2);
// int64_t b3 = 2097151 & (load_4(b + 7) >> 7);
// int64_t b4 = 2097151 & (load_4(b + 10) >> 4);
// int64_t b5 = 2097151 & (load_3(b + 13) >> 1);
// int64_t b6 = 2097151 & (load_4(b + 15) >> 6);
// int64_t b7 = 2097151 & (load_3(b + 18) >> 3);
// int64_t b8 = 2097151 & load_3(b + 21);
// int64_t b9 = 2097151 & (load_4(b + 23) >> 5);
// int64_t b10 = 2097151 & (load_3(b + 26) >> 2);
// int64_t b11 = (load_4(b + 28) >> 7);
$b0 = 2097151 & self::load_3(self::substr($b, 0, 3));
$b1 = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
$b2 = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
$b3 = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
$b4 = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
$b5 = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
$b6 = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
$b7 = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
$b8 = 2097151 & self::load_3(self::substr($b, 21, 3));
$b9 = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
$b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
$b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);
// s0 = a0 * b0;
// s1 = a0 * b1 + a1 * b0;
// s2 = a0 * b2 + a1 * b1 + a2 * b0;
// s3 = a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
// s4 = a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
// s5 = a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
// s6 = a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
// s7 = a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +
// a6 * b1 + a7 * b0;
// s8 = a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +
// a6 * b2 + a7 * b1 + a8 * b0;
// s9 = a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +
// a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
// s10 = a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +
// a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
// s11 = a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +
// a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
// s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 +
// a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
// s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 +
// a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;
// s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 +
// a9 * b5 + a10 * b4 + a11 * b3;
// s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 +
// a10 * b5 + a11 * b4;
// s16 =
// a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
// s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
// s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
// s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
// s20 = a9 * b11 + a10 * b10 + a11 * b9;
// s21 = a10 * b11 + a11 * b10;
// s22 = a11 * b11;
// s23 = 0;
$s0 = self::mul($a0, $b0, 22);
$s1 = self::mul($a0, $b1, 22) + self::mul($a1, $b0, 22);
$s2 = self::mul($a0, $b2, 22) + self::mul($a1, $b1, 22) + self::mul($a2, $b0, 22);
$s3 = self::mul($a0, $b3, 22) + self::mul($a1, $b2, 22) + self::mul($a2, $b1, 22) + self::mul($a3, $b0, 22);
$s4 = self::mul($a0, $b4, 22) + self::mul($a1, $b3, 22) + self::mul($a2, $b2, 22) + self::mul($a3, $b1, 22) +
self::mul($a4, $b0, 22);
$s5 = self::mul($a0, $b5, 22) + self::mul($a1, $b4, 22) + self::mul($a2, $b3, 22) + self::mul($a3, $b2, 22) +
self::mul($a4, $b1, 22) + self::mul($a5, $b0, 22);
$s6 = self::mul($a0, $b6, 22) + self::mul($a1, $b5, 22) + self::mul($a2, $b4, 22) + self::mul($a3, $b3, 22) +
self::mul($a4, $b2, 22) + self::mul($a5, $b1, 22) + self::mul($a6, $b0, 22);
$s7 = self::mul($a0, $b7, 22) + self::mul($a1, $b6, 22) + self::mul($a2, $b5, 22) + self::mul($a3, $b4, 22) +
self::mul($a4, $b3, 22) + self::mul($a5, $b2, 22) + self::mul($a6, $b1, 22) + self::mul($a7, $b0, 22);
$s8 = self::mul($a0, $b8, 22) + self::mul($a1, $b7, 22) + self::mul($a2, $b6, 22) + self::mul($a3, $b5, 22) +
self::mul($a4, $b4, 22) + self::mul($a5, $b3, 22) + self::mul($a6, $b2, 22) + self::mul($a7, $b1, 22) +
self::mul($a8, $b0, 22);
$s9 = self::mul($a0, $b9, 22) + self::mul($a1, $b8, 22) + self::mul($a2, $b7, 22) + self::mul($a3, $b6, 22) +
self::mul($a4, $b5, 22) + self::mul($a5, $b4, 22) + self::mul($a6, $b3, 22) + self::mul($a7, $b2, 22) +
self::mul($a8, $b1, 22) + self::mul($a9, $b0, 22);
$s10 = self::mul($a0, $b10, 22) + self::mul($a1, $b9, 22) + self::mul($a2, $b8, 22) + self::mul($a3, $b7, 22) +
self::mul($a4, $b6, 22) + self::mul($a5, $b5, 22) + self::mul($a6, $b4, 22) + self::mul($a7, $b3, 22) +
self::mul($a8, $b2, 22) + self::mul($a9, $b1, 22) + self::mul($a10, $b0, 22);
$s11 = self::mul($a0, $b11, 22) + self::mul($a1, $b10, 22) + self::mul($a2, $b9, 22) + self::mul($a3, $b8, 22) +
self::mul($a4, $b7, 22) + self::mul($a5, $b6, 22) + self::mul($a6, $b5, 22) + self::mul($a7, $b4, 22) +
self::mul($a8, $b3, 22) + self::mul($a9, $b2, 22) + self::mul($a10, $b1, 22) + self::mul($a11, $b0, 22);
$s12 = self::mul($a1, $b11, 22) + self::mul($a2, $b10, 22) + self::mul($a3, $b9, 22) + self::mul($a4, $b8, 22) +
self::mul($a5, $b7, 22) + self::mul($a6, $b6, 22) + self::mul($a7, $b5, 22) + self::mul($a8, $b4, 22) +
self::mul($a9, $b3, 22) + self::mul($a10, $b2, 22) + self::mul($a11, $b1, 22);
$s13 = self::mul($a2, $b11, 22) + self::mul($a3, $b10, 22) + self::mul($a4, $b9, 22) + self::mul($a5, $b8, 22) +
self::mul($a6, $b7, 22) + self::mul($a7, $b6, 22) + self::mul($a8, $b5, 22) + self::mul($a9, $b4, 22) +
self::mul($a10, $b3, 22) + self::mul($a11, $b2, 22);
$s14 = self::mul($a3, $b11, 22) + self::mul($a4, $b10, 22) + self::mul($a5, $b9, 22) + self::mul($a6, $b8, 22) +
self::mul($a7, $b7, 22) + self::mul($a8, $b6, 22) + self::mul($a9, $b5, 22) + self::mul($a10, $b4, 22) +
self::mul($a11, $b3, 22);
$s15 = self::mul($a4, $b11, 22) + self::mul($a5, $b10, 22) + self::mul($a6, $b9, 22) + self::mul($a7, $b8, 22) +
self::mul($a8, $b7, 22) + self::mul($a9, $b6, 22) + self::mul($a10, $b5, 22) + self::mul($a11, $b4, 22);
$s16 =
self::mul($a5, $b11, 22) + self::mul($a6, $b10, 22) + self::mul($a7, $b9, 22) + self::mul($a8, $b8, 22) +
self::mul($a9, $b7, 22) + self::mul($a10, $b6, 22) + self::mul($a11, $b5, 22);
$s17 = self::mul($a6, $b11, 22) + self::mul($a7, $b10, 22) + self::mul($a8, $b9, 22) + self::mul($a9, $b8, 22) +
self::mul($a10, $b7, 22) + self::mul($a11, $b6, 22);
$s18 = self::mul($a7, $b11, 22) + self::mul($a8, $b10, 22) + self::mul($a9, $b9, 22) + self::mul($a10, $b8, 22)
+ self::mul($a11, $b7, 22);
$s19 = self::mul($a8, $b11, 22) + self::mul($a9, $b10, 22) + self::mul($a10, $b9, 22) +
self::mul($a11, $b8, 22);
$s20 = self::mul($a9, $b11, 22) + self::mul($a10, $b10, 22) + self::mul($a11, $b9, 22);
$s21 = self::mul($a10, $b11, 22) + self::mul($a11, $b10, 22);
$s22 = self::mul($a11, $b11, 22);
$s23 = 0;
// carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
// s1 += carry0;
// s0 -= carry0 * ((uint64_t) 1L << 21);
$carry0 = ($s0 + (1 << 20)) >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
// carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
// s3 += carry2;
// s2 -= carry2 * ((uint64_t) 1L << 21);
$carry2 = ($s2 + (1 << 20)) >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
// carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
// s5 += carry4;
// s4 -= carry4 * ((uint64_t) 1L << 21);
$carry4 = ($s4 + (1 << 20)) >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
// carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
// s7 += carry6;
// s6 -= carry6 * ((uint64_t) 1L << 21);
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
// carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
// s9 += carry8;
// s8 -= carry8 * ((uint64_t) 1L << 21);
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
// carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
// s11 += carry10;
// s10 -= carry10 * ((uint64_t) 1L << 21);
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
// carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
// s13 += carry12;
// s12 -= carry12 * ((uint64_t) 1L << 21);
$carry12 = ($s12 + (1 << 20)) >> 21;
$s13 += $carry12;
$s12 -= $carry12 << 21;
// carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
// s15 += carry14;
// s14 -= carry14 * ((uint64_t) 1L << 21);
$carry14 = ($s14 + (1 << 20)) >> 21;
$s15 += $carry14;
$s14 -= $carry14 << 21;
// carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
// s17 += carry16;
// s16 -= carry16 * ((uint64_t) 1L << 21);
$carry16 = ($s16 + (1 << 20)) >> 21;
$s17 += $carry16;
$s16 -= $carry16 << 21;
// carry18 = (s18 + (int64_t) (1L << 20)) >> 21;
// s19 += carry18;
// s18 -= carry18 * ((uint64_t) 1L << 21);
$carry18 = ($s18 + (1 << 20)) >> 21;
$s19 += $carry18;
$s18 -= $carry18 << 21;
// carry20 = (s20 + (int64_t) (1L << 20)) >> 21;
// s21 += carry20;
// s20 -= carry20 * ((uint64_t) 1L << 21);
$carry20 = ($s20 + (1 << 20)) >> 21;
$s21 += $carry20;
$s20 -= $carry20 << 21;
// carry22 = (s22 + (int64_t) (1L << 20)) >> 21;
// s23 += carry22;
// s22 -= carry22 * ((uint64_t) 1L << 21);
$carry22 = ($s22 + (1 << 20)) >> 21;
$s23 += $carry22;
$s22 -= $carry22 << 21;
// carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
// s2 += carry1;
// s1 -= carry1 * ((uint64_t) 1L << 21);
$carry1 = ($s1 + (1 << 20)) >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
// carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
// s4 += carry3;
// s3 -= carry3 * ((uint64_t) 1L << 21);
$carry3 = ($s3 + (1 << 20)) >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
// carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
// s6 += carry5;
// s5 -= carry5 * ((uint64_t) 1L << 21);
$carry5 = ($s5 + (1 << 20)) >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
// carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
// s8 += carry7;
// s7 -= carry7 * ((uint64_t) 1L << 21);
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
// carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
// s10 += carry9;
// s9 -= carry9 * ((uint64_t) 1L << 21);
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
// carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
// s12 += carry11;
// s11 -= carry11 * ((uint64_t) 1L << 21);
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
// carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
// s14 += carry13;
// s13 -= carry13 * ((uint64_t) 1L << 21);
$carry13 = ($s13 + (1 << 20)) >> 21;
$s14 += $carry13;
$s13 -= $carry13 << 21;
// carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
// s16 += carry15;
// s15 -= carry15 * ((uint64_t) 1L << 21);
$carry15 = ($s15 + (1 << 20)) >> 21;
$s16 += $carry15;
$s15 -= $carry15 << 21;
// carry17 = (s17 + (int64_t) (1L << 20)) >> 21;
// s18 += carry17;
// s17 -= carry17 * ((uint64_t) 1L << 21);
$carry17 = ($s17 + (1 << 20)) >> 21;
$s18 += $carry17;
$s17 -= $carry17 << 21;
// carry19 = (s19 + (int64_t) (1L << 20)) >> 21;
// s20 += carry19;
// s19 -= carry19 * ((uint64_t) 1L << 21);
$carry19 = ($s19 + (1 << 20)) >> 21;
$s20 += $carry19;
$s19 -= $carry19 << 21;
// carry21 = (s21 + (int64_t) (1L << 20)) >> 21;
// s22 += carry21;
// s21 -= carry21 * ((uint64_t) 1L << 21);
$carry21 = ($s21 + (1 << 20)) >> 21;
$s22 += $carry21;
$s21 -= $carry21 << 21;
// s11 += s23 * 666643;
// s12 += s23 * 470296;
// s13 += s23 * 654183;
// s14 -= s23 * 997805;
// s15 += s23 * 136657;
// s16 -= s23 * 683901;
$s11 += self::mul($s23, 666643, 20);
$s12 += self::mul($s23, 470296, 19);
$s13 += self::mul($s23, 654183, 20);
$s14 -= self::mul($s23, 997805, 20);
$s15 += self::mul($s23, 136657, 18);
$s16 -= self::mul($s23, 683901, 20);
// s10 += s22 * 666643;
// s11 += s22 * 470296;
// s12 += s22 * 654183;
// s13 -= s22 * 997805;
// s14 += s22 * 136657;
// s15 -= s22 * 683901;
$s10 += self::mul($s22, 666643, 20);
$s11 += self::mul($s22, 470296, 19);
$s12 += self::mul($s22, 654183, 20);
$s13 -= self::mul($s22, 997805, 20);
$s14 += self::mul($s22, 136657, 18);
$s15 -= self::mul($s22, 683901, 20);
// s9 += s21 * 666643;
// s10 += s21 * 470296;
// s11 += s21 * 654183;
// s12 -= s21 * 997805;
// s13 += s21 * 136657;
// s14 -= s21 * 683901;
$s9 += self::mul($s21, 666643, 20);
$s10 += self::mul($s21, 470296, 19);
$s11 += self::mul($s21, 654183, 20);
$s12 -= self::mul($s21, 997805, 20);
$s13 += self::mul($s21, 136657, 18);
$s14 -= self::mul($s21, 683901, 20);
// s8 += s20 * 666643;
// s9 += s20 * 470296;
// s10 += s20 * 654183;
// s11 -= s20 * 997805;
// s12 += s20 * 136657;
// s13 -= s20 * 683901;
$s8 += self::mul($s20, 666643, 20);
$s9 += self::mul($s20, 470296, 19);
$s10 += self::mul($s20, 654183, 20);
$s11 -= self::mul($s20, 997805, 20);
$s12 += self::mul($s20, 136657, 18);
$s13 -= self::mul($s20, 683901, 20);
// s7 += s19 * 666643;
// s8 += s19 * 470296;
// s9 += s19 * 654183;
// s10 -= s19 * 997805;
// s11 += s19 * 136657;
// s12 -= s19 * 683901;
$s7 += self::mul($s19, 666643, 20);
$s8 += self::mul($s19, 470296, 19);
$s9 += self::mul($s19, 654183, 20);
$s10 -= self::mul($s19, 997805, 20);
$s11 += self::mul($s19, 136657, 18);
$s12 -= self::mul($s19, 683901, 20);
// s6 += s18 * 666643;
// s7 += s18 * 470296;
// s8 += s18 * 654183;
// s9 -= s18 * 997805;
// s10 += s18 * 136657;
// s11 -= s18 * 683901;
$s6 += self::mul($s18, 666643, 20);
$s7 += self::mul($s18, 470296, 19);
$s8 += self::mul($s18, 654183, 20);
$s9 -= self::mul($s18, 997805, 20);
$s10 += self::mul($s18, 136657, 18);
$s11 -= self::mul($s18, 683901, 20);
// carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
// s7 += carry6;
// s6 -= carry6 * ((uint64_t) 1L << 21);
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
// carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
// s9 += carry8;
// s8 -= carry8 * ((uint64_t) 1L << 21);
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
// carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
// s11 += carry10;
// s10 -= carry10 * ((uint64_t) 1L << 21);
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
// carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
// s13 += carry12;
// s12 -= carry12 * ((uint64_t) 1L << 21);
$carry12 = ($s12 + (1 << 20)) >> 21;
$s13 += $carry12;
$s12 -= $carry12 << 21;
// carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
// s15 += carry14;
// s14 -= carry14 * ((uint64_t) 1L << 21);
$carry14 = ($s14 + (1 << 20)) >> 21;
$s15 += $carry14;
$s14 -= $carry14 << 21;
// carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
// s17 += carry16;
// s16 -= carry16 * ((uint64_t) 1L << 21);
$carry16 = ($s16 + (1 << 20)) >> 21;
$s17 += $carry16;
$s16 -= $carry16 << 21;
// carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
// s8 += carry7;
// s7 -= carry7 * ((uint64_t) 1L << 21);
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
// carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
// s10 += carry9;
// s9 -= carry9 * ((uint64_t) 1L << 21);
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
// carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
// s12 += carry11;
// s11 -= carry11 * ((uint64_t) 1L << 21);
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
// carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
// s14 += carry13;
// s13 -= carry13 * ((uint64_t) 1L << 21);
$carry13 = ($s13 + (1 << 20)) >> 21;
$s14 += $carry13;
$s13 -= $carry13 << 21;
// carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
// s16 += carry15;
// s15 -= carry15 * ((uint64_t) 1L << 21);
$carry15 = ($s15 + (1 << 20)) >> 21;
$s16 += $carry15;
$s15 -= $carry15 << 21;
// s5 += s17 * 666643;
// s6 += s17 * 470296;
// s7 += s17 * 654183;
// s8 -= s17 * 997805;
// s9 += s17 * 136657;
// s10 -= s17 * 683901;
$s5 += self::mul($s17, 666643, 20);
$s6 += self::mul($s17, 470296, 19);
$s7 += self::mul($s17, 654183, 20);
$s8 -= self::mul($s17, 997805, 20);
$s9 += self::mul($s17, 136657, 18);
$s10 -= self::mul($s17, 683901, 20);
// s4 += s16 * 666643;
// s5 += s16 * 470296;
// s6 += s16 * 654183;
// s7 -= s16 * 997805;
// s8 += s16 * 136657;
// s9 -= s16 * 683901;
$s4 += self::mul($s16, 666643, 20);
$s5 += self::mul($s16, 470296, 19);
$s6 += self::mul($s16, 654183, 20);
$s7 -= self::mul($s16, 997805, 20);
$s8 += self::mul($s16, 136657, 18);
$s9 -= self::mul($s16, 683901, 20);
// s3 += s15 * 666643;
// s4 += s15 * 470296;
// s5 += s15 * 654183;
// s6 -= s15 * 997805;
// s7 += s15 * 136657;
// s8 -= s15 * 683901;
$s3 += self::mul($s15, 666643, 20);
$s4 += self::mul($s15, 470296, 19);
$s5 += self::mul($s15, 654183, 20);
$s6 -= self::mul($s15, 997805, 20);
$s7 += self::mul($s15, 136657, 18);
$s8 -= self::mul($s15, 683901, 20);
// s2 += s14 * 666643;
// s3 += s14 * 470296;
// s4 += s14 * 654183;
// s5 -= s14 * 997805;
// s6 += s14 * 136657;
// s7 -= s14 * 683901;
$s2 += self::mul($s14, 666643, 20);
$s3 += self::mul($s14, 470296, 19);
$s4 += self::mul($s14, 654183, 20);
$s5 -= self::mul($s14, 997805, 20);
$s6 += self::mul($s14, 136657, 18);
$s7 -= self::mul($s14, 683901, 20);
// s1 += s13 * 666643;
// s2 += s13 * 470296;
// s3 += s13 * 654183;
// s4 -= s13 * 997805;
// s5 += s13 * 136657;
// s6 -= s13 * 683901;
$s1 += self::mul($s13, 666643, 20);
$s2 += self::mul($s13, 470296, 19);
$s3 += self::mul($s13, 654183, 20);
$s4 -= self::mul($s13, 997805, 20);
$s5 += self::mul($s13, 136657, 18);
$s6 -= self::mul($s13, 683901, 20);
// s0 += s12 * 666643;
// s1 += s12 * 470296;
// s2 += s12 * 654183;
// s3 -= s12 * 997805;
// s4 += s12 * 136657;
// s5 -= s12 * 683901;
// s12 = 0;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
// carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
// s1 += carry0;
// s0 -= carry0 * ((uint64_t) 1L << 21);
$carry0 = ($s0 + (1 << 20)) >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
// carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
// s3 += carry2;
// s2 -= carry2 * ((uint64_t) 1L << 21);
$carry2 = ($s2 + (1 << 20)) >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
// carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
// s5 += carry4;
// s4 -= carry4 * ((uint64_t) 1L << 21);
$carry4 = ($s4 + (1 << 20)) >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
// carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
// s7 += carry6;
// s6 -= carry6 * ((uint64_t) 1L << 21);
$carry6 = ($s6 + (1 << 20)) >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
// carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
// s9 += carry8;
// s8 -= carry8 * ((uint64_t) 1L << 21);
$carry8 = ($s8 + (1 << 20)) >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
// carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
// s11 += carry10;
// s10 -= carry10 * ((uint64_t) 1L << 21);
$carry10 = ($s10 + (1 << 20)) >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
// carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
// s2 += carry1;
// s1 -= carry1 * ((uint64_t) 1L << 21);
$carry1 = ($s1 + (1 << 20)) >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
// carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
// s4 += carry3;
// s3 -= carry3 * ((uint64_t) 1L << 21);
$carry3 = ($s3 + (1 << 20)) >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
// carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
// s6 += carry5;
// s5 -= carry5 * ((uint64_t) 1L << 21);
$carry5 = ($s5 + (1 << 20)) >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
// carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
// s8 += carry7;
// s7 -= carry7 * ((uint64_t) 1L << 21);
$carry7 = ($s7 + (1 << 20)) >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
// carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
// s10 += carry9;
// s9 -= carry9 * ((uint64_t) 1L << 21);
$carry9 = ($s9 + (1 << 20)) >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
// carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
// s12 += carry11;
// s11 -= carry11 * ((uint64_t) 1L << 21);
$carry11 = ($s11 + (1 << 20)) >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
// s0 += s12 * 666643;
// s1 += s12 * 470296;
// s2 += s12 * 654183;
// s3 -= s12 * 997805;
// s4 += s12 * 136657;
// s5 -= s12 * 683901;
// s12 = 0;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
$s12 = 0;
// carry0 = s0 >> 21;
// s1 += carry0;
// s0 -= carry0 * ((uint64_t) 1L << 21);
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
// carry1 = s1 >> 21;
// s2 += carry1;
// s1 -= carry1 * ((uint64_t) 1L << 21);
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
// carry2 = s2 >> 21;
// s3 += carry2;
// s2 -= carry2 * ((uint64_t) 1L << 21);
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
// carry3 = s3 >> 21;
// s4 += carry3;
// s3 -= carry3 * ((uint64_t) 1L << 21);
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
// carry4 = s4 >> 21;
// s5 += carry4;
// s4 -= carry4 * ((uint64_t) 1L << 21);
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
// carry5 = s5 >> 21;
// s6 += carry5;
// s5 -= carry5 * ((uint64_t) 1L << 21);
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
// carry6 = s6 >> 21;
// s7 += carry6;
// s6 -= carry6 * ((uint64_t) 1L << 21);
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
// carry7 = s7 >> 21;
// s8 += carry7;
// s7 -= carry7 * ((uint64_t) 1L << 21);
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
// carry8 = s8 >> 21;
// s9 += carry8;
// s8 -= carry8 * ((uint64_t) 1L << 21);
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
// carry9 = s9 >> 21;
// s10 += carry9;
// s9 -= carry9 * ((uint64_t) 1L << 21);
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
// carry10 = s10 >> 21;
// s11 += carry10;
// s10 -= carry10 * ((uint64_t) 1L << 21);
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
// carry11 = s11 >> 21;
// s12 += carry11;
// s11 -= carry11 * ((uint64_t) 1L << 21);
$carry11 = $s11 >> 21;
$s12 += $carry11;
$s11 -= $carry11 << 21;
// s0 += s12 * 666643;
// s1 += s12 * 470296;
// s2 += s12 * 654183;
// s3 -= s12 * 997805;
// s4 += s12 * 136657;
// s5 -= s12 * 683901;
$s0 += self::mul($s12, 666643, 20);
$s1 += self::mul($s12, 470296, 19);
$s2 += self::mul($s12, 654183, 20);
$s3 -= self::mul($s12, 997805, 20);
$s4 += self::mul($s12, 136657, 18);
$s5 -= self::mul($s12, 683901, 20);
// carry0 = s0 >> 21;
// s1 += carry0;
// s0 -= carry0 * ((uint64_t) 1L << 21);
$carry0 = $s0 >> 21;
$s1 += $carry0;
$s0 -= $carry0 << 21;
// carry1 = s1 >> 21;
// s2 += carry1;
// s1 -= carry1 * ((uint64_t) 1L << 21);
$carry1 = $s1 >> 21;
$s2 += $carry1;
$s1 -= $carry1 << 21;
// carry2 = s2 >> 21;
// s3 += carry2;
// s2 -= carry2 * ((uint64_t) 1L << 21);
$carry2 = $s2 >> 21;
$s3 += $carry2;
$s2 -= $carry2 << 21;
// carry3 = s3 >> 21;
// s4 += carry3;
// s3 -= carry3 * ((uint64_t) 1L << 21);
$carry3 = $s3 >> 21;
$s4 += $carry3;
$s3 -= $carry3 << 21;
// carry4 = s4 >> 21;
// s5 += carry4;
// s4 -= carry4 * ((uint64_t) 1L << 21);
$carry4 = $s4 >> 21;
$s5 += $carry4;
$s4 -= $carry4 << 21;
// carry5 = s5 >> 21;
// s6 += carry5;
// s5 -= carry5 * ((uint64_t) 1L << 21);
$carry5 = $s5 >> 21;
$s6 += $carry5;
$s5 -= $carry5 << 21;
// carry6 = s6 >> 21;
// s7 += carry6;
// s6 -= carry6 * ((uint64_t) 1L << 21);
$carry6 = $s6 >> 21;
$s7 += $carry6;
$s6 -= $carry6 << 21;
// carry7 = s7 >> 21;
// s8 += carry7;
// s7 -= carry7 * ((uint64_t) 1L << 21);
$carry7 = $s7 >> 21;
$s8 += $carry7;
$s7 -= $carry7 << 21;
// carry8 = s8 >> 21;
// s9 += carry8;
// s8 -= carry8 * ((uint64_t) 1L << 21);
$carry8 = $s8 >> 21;
$s9 += $carry8;
$s8 -= $carry8 << 21;
// carry9 = s9 >> 21;
// s10 += carry9;
// s9 -= carry9 * ((uint64_t) 1L << 21);
$carry9 = $s9 >> 21;
$s10 += $carry9;
$s9 -= $carry9 << 21;
// carry10 = s10 >> 21;
// s11 += carry10;
// s10 -= carry10 * ((uint64_t) 1L << 21);
$carry10 = $s10 >> 21;
$s11 += $carry10;
$s10 -= $carry10 << 21;
$s = array_fill(0, 32, 0);
// s[0] = s0 >> 0;
$s[0] = $s0 >> 0;
// s[1] = s0 >> 8;
$s[1] = $s0 >> 8;
// s[2] = (s0 >> 16) | (s1 * ((uint64_t) 1 << 5));
$s[2] = ($s0 >> 16) | ($s1 << 5);
// s[3] = s1 >> 3;
$s[3] = $s1 >> 3;
// s[4] = s1 >> 11;
$s[4] = $s1 >> 11;
// s[5] = (s1 >> 19) | (s2 * ((uint64_t) 1 << 2));
$s[5] = ($s1 >> 19) | ($s2 << 2);
// s[6] = s2 >> 6;
$s[6] = $s2 >> 6;
// s[7] = (s2 >> 14) | (s3 * ((uint64_t) 1 << 7));
$s[7] = ($s2 >> 14) | ($s3 << 7);
// s[8] = s3 >> 1;
$s[8] = $s3 >> 1;
// s[9] = s3 >> 9;
$s[9] = $s3 >> 9;
// s[10] = (s3 >> 17) | (s4 * ((uint64_t) 1 << 4));
$s[10] = ($s3 >> 17) | ($s4 << 4);
// s[11] = s4 >> 4;
$s[11] = $s4 >> 4;
// s[12] = s4 >> 12;
$s[12] = $s4 >> 12;
// s[13] = (s4 >> 20) | (s5 * ((uint64_t) 1 << 1));
$s[13] = ($s4 >> 20) | ($s5 << 1);
// s[14] = s5 >> 7;
$s[14] = $s5 >> 7;
// s[15] = (s5 >> 15) | (s6 * ((uint64_t) 1 << 6));
$s[15] = ($s5 >> 15) | ($s6 << 6);
// s[16] = s6 >> 2;
$s[16] = $s6 >> 2;
// s[17] = s6 >> 10;
$s[17] = $s6 >> 10;
// s[18] = (s6 >> 18) | (s7 * ((uint64_t) 1 << 3));
$s[18] = ($s6 >> 18) | ($s7 << 3);
// s[19] = s7 >> 5;
$s[19] = $s7 >> 5;
// s[20] = s7 >> 13;
$s[20] = $s7 >> 13;
// s[21] = s8 >> 0;
$s[21] = $s8 >> 0;
// s[22] = s8 >> 8;
$s[22] = $s8 >> 8;
// s[23] = (s8 >> 16) | (s9 * ((uint64_t) 1 << 5));
$s[23] = ($s8 >> 16) | ($s9 << 5);
// s[24] = s9 >> 3;
$s[24] = $s9 >> 3;
// s[25] = s9 >> 11;
$s[25] = $s9 >> 11;
// s[26] = (s9 >> 19) | (s10 * ((uint64_t) 1 << 2));
$s[26] = ($s9 >> 19) | ($s10 << 2);
// s[27] = s10 >> 6;
$s[27] = $s10 >> 6;
// s[28] = (s10 >> 14) | (s11 * ((uint64_t) 1 << 7));
$s[28] = ($s10 >> 14) | ($s11 << 7);
// s[29] = s11 >> 1;
$s[29] = $s11 >> 1;
// s[30] = s11 >> 9;
$s[30] = $s11 >> 9;
// s[31] = s11 >> 17;
$s[31] = $s11 >> 17;
return self::intArrayToString($s);
}
/**
* @param string $s
* @return string
*/
public static function sc25519_sq($s)
{
return self::sc25519_mul($s, $s);
}
/**
* @param string $s
* @param int $n
* @param string $a
* @return string
*/
public static function sc25519_sqmul($s, $n, $a)
{
for ($i = 0; $i < $n; ++$i) {
$s = self::sc25519_sq($s);
}
return self::sc25519_mul($s, $a);
}
/**
* @param string $s
* @return string
*/
public static function sc25519_invert($s)
{
$_10 = self::sc25519_sq($s);
$_11 = self::sc25519_mul($s, $_10);
$_100 = self::sc25519_mul($s, $_11);
$_1000 = self::sc25519_sq($_100);
$_1010 = self::sc25519_mul($_10, $_1000);
$_1011 = self::sc25519_mul($s, $_1010);
$_10000 = self::sc25519_sq($_1000);
$_10110 = self::sc25519_sq($_1011);
$_100000 = self::sc25519_mul($_1010, $_10110);
$_100110 = self::sc25519_mul($_10000, $_10110);
$_1000000 = self::sc25519_sq($_100000);
$_1010000 = self::sc25519_mul($_10000, $_1000000);
$_1010011 = self::sc25519_mul($_11, $_1010000);
$_1100011 = self::sc25519_mul($_10000, $_1010011);
$_1100111 = self::sc25519_mul($_100, $_1100011);
$_1101011 = self::sc25519_mul($_100, $_1100111);
$_10010011 = self::sc25519_mul($_1000000, $_1010011);
$_10010111 = self::sc25519_mul($_100, $_10010011);
$_10111101 = self::sc25519_mul($_100110, $_10010111);
$_11010011 = self::sc25519_mul($_10110, $_10111101);
$_11100111 = self::sc25519_mul($_1010000, $_10010111);
$_11101011 = self::sc25519_mul($_100, $_11100111);
$_11110101 = self::sc25519_mul($_1010, $_11101011);
$recip = self::sc25519_mul($_1011, $_11110101);
$recip = self::sc25519_sqmul($recip, 126, $_1010011);
$recip = self::sc25519_sqmul($recip, 9, $_10);
$recip = self::sc25519_mul($recip, $_11110101);
$recip = self::sc25519_sqmul($recip, 7, $_1100111);
$recip = self::sc25519_sqmul($recip, 9, $_11110101);
$recip = self::sc25519_sqmul($recip, 11, $_10111101);
$recip = self::sc25519_sqmul($recip, 8, $_11100111);
$recip = self::sc25519_sqmul($recip, 9, $_1101011);
$recip = self::sc25519_sqmul($recip, 6, $_1011);
$recip = self::sc25519_sqmul($recip, 14, $_10010011);
$recip = self::sc25519_sqmul($recip, 10, $_1100011);
$recip = self::sc25519_sqmul($recip, 9, $_10010111);
$recip = self::sc25519_sqmul($recip, 10, $_11110101);
$recip = self::sc25519_sqmul($recip, 8, $_11010011);
return self::sc25519_sqmul($recip, 8, $_11101011);
}
/**
* @param string $s
* @return string
*/
public static function clamp($s)
{
$s_ = self::stringToIntArray($s);
$s_[0] &= 248;
$s_[31] |= 64;
$s_[31] &= 128;
return self::intArrayToString($s_);
}
/**
* Ensure limbs are less than 28 bits long to prevent float promotion.
*
* This uses a constant-time conditional swap under the hood.
*
* @param ParagonIE_Sodium_Core_Curve25519_Fe $f
* @return ParagonIE_Sodium_Core_Curve25519_Fe
*/
public static function fe_normalize(ParagonIE_Sodium_Core_Curve25519_Fe $f)
{
$x = (PHP_INT_SIZE << 3) - 1; // 31 or 63
$g = self::fe_copy($f);
for ($i = 0; $i < 10; ++$i) {
$mask = -(($g[$i] >> $x) & 1);
/*
* Get two candidate normalized values for $g[$i], depending on the sign of $g[$i]:
*/
$a = $g[$i] & 0x7ffffff;
$b = -((-$g[$i]) & 0x7ffffff);
/*
* Return the appropriate candidate value, based on the sign of the original input:
*
* The following is equivalent to this ternary:
*
* $g[$i] = (($g[$i] >> $x) & 1) ? $a : $b;
*
* Except what's written doesn't contain timing leaks.
*/
$g[$i] = ($a ^ (($a ^ $b) & $mask));
}
return $g;
}
}
عالم تحت المجهر الرقمي…عندما تكتب، هناك من يتذكر ويراقب – tahkoom.com
كتبت ميرنا أشرف
ظاهرة تثير جدل بدأ يلاحظها مستخدمي تطبيق “شات جي بي تي” وهي أن التطبيق ينادي المستخدمين بأسمائهم الاولى اثناء المحادثات وتلقي المعلومات منه رغم انهم لم يخبروه بها مسبقا، نظرا لما قالته احد لمستخدمين لتطبيق الذكاء الاصطناعي “شات جي بي تي”، انها كانت تسأله عن معلومات بشكل طبيعي دون ان تذكر أي أسماء .
فوجئت بأن التطبيق رد عليها مستخدما اسمها واسم صديقتها، رغم أنها لم تصرح عنهما مطلقا في اي محادثه سابقه من محادثاتها. هذا الموقف أثار جدل حول مدي قدرة الذكاء الاصطناعي على الوصول إلى معلومات شخصية وخفيه، مما يثير مخاوف تعلق بالخصوصية واستخدام الذاكرة .
إن صنع نظام آلي قادر على تكوين ذاكرة اجتماعية عن البشر لم يعد مجرد تحد تقني… بل أصبح واقعًا مخيفًا، لأن ليس محور الكلام هنا عن مجرد جهاز بيخزن بيانات، نحن نتحدث عن آلة بتراقب، وبتحلل، وبتتعلم بصمت؛ الأهم من ذلك هو حقيقة أنه عندما نتحدث الي ذلك النظام ويرد على المستخدم بردود غير متوقعه وكأنه يعرفه ويتتبعه. هذه عملية لم يتمكن المستخدمين من تفسيرها .
تمييز الذكاء الاصطناعي
بما يتعلق بنظام الذكاء الاصطناعي أوضح هشام عبدالعال أستاذ في مجال التكنولوجيا، أن الذكاء الاصطناعي لم يعد مجرد أداة تقنية تقتصر على تحليل البيانات وتقديم ردود بشكل الي ولكنه أصبح مع مرور الوقت لديه قدرة على تكوين ذاكرة اجتماعية عن المستخدمين وذلك عن طريق تحليل سلوكهم واختياراتهم واسلوب حديثهم .
مضيفاً، أن نظام الذكاء الاصطناعي الذي يوجد داخل التطبيق لا يصنف الخلفيات الاجتماعية بشكل مباشر، لكنه يتعامل حسب اللغة المستخدمة عامية أو فصحى، لكن التطبيق لا يميز بين طالب أو ربة منزل أو حتى عامل بشكل مباشر، بل يتعامل مع نوعية الأسئلة والأسلوب المقدمة له .
وتابع عبدالعال، لكن في حاله وجود أكثر من شخص يستخدم نفس الجهاز أو الحساب الردود ستكون متأثرة بالسياق السابق، أو ممكن ذلك يعطي إحساس أن الآلة متذكره أو بتتفاعل بشكل مختلف، لكن بمجرد إنهاء المحادثة أو حذفها، فسيتم غلط المحادثة .
هل تتذكر الآلة؟
اتفق معه في الرأي الأستاذ عمر أشرف، أستاذ في التكنولوجيا، مضيفاً أنه رسميًا، الذكاء الاصطناعي مثل تطبيق شآت جي بي تي لا يحتفظ بتفاصيل شخصية عن المستخدم إلا إذا المستخدم فعل خاصية الذاكرة بشكل واضح .
لكن هناك مستخدمين لاحظوا أن النموذج يناديهم بأسمائهم بدون ما يقدموها بشكل مباشر، وذلك فتح باب للشك حول وجود نوع من التتبع الخفي أو آلية لتجميع الأنماط السلوكية من وراء الكواليس .
بيانات تجمع بصمت
وفيما يتعلق بالأمن السيبراني يري الطرفان، انه يوجد تحديات تواجه الأمن السيبراني في ذلك الموضوع فتكوين هذه الذاكرة يكون عن طريق جمع بيانات شخصية وسلوكية دقيقة للغاية وغالبًا ما يتم ذلك دون إدراك المستخدم الكامل كما تشمل هذه البيانات أنماط الكتابة، نوعية الأسئلة بل وقد تكشف ما بين السطور عن خلفيات نفسية أو اجتماعية
ضافوا، أنه على الرغم من أن بعض الشركات تبرر استخدام البيانات وذلك لتحسين تجربة المستخدم إلا إن غياب الشفافية يفتح الباب للتتبع غير المباشر للهوية .
وفي حالة استخدام الذكاء الاصطناعي بدون رقابة صارمة أو قوانين واضحة من الممكن ان تتحول هذه الذاكرة إلى ملف شخصي خفي وذلك قابل لاستغلاله في اغراض تجارية أو سياسية أو أمنيه .
الذكاء الاصطناعي لم يعد مجرد أداة، بل أصبح قادر على تكوين صورة آلية عن المستخدم دون علمه، وبينما يعد هذا تطور تقني كبير، فإن غياب الرقابة يثير مخاوف حقيقية حول الخصوصية واستخدام البيانات الشخصية، مما يتطلب ضوابط صارمة تحمي المستخدم قبل أن تتحول التقنية إلى مخاطر خفيه.
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