public static function ParagonIE_Sodium_Core32_Curve25519::fe_tobytes in Automatic Updates 8

Same name and namespace in other branches

1. 7 vendor/paragonie/sodium_compat/src/Core32/Curve25519.php \ParagonIE_Sodium_Core32_Curve25519::fe_tobytes()

Convert a field element to a byte string.

@internal You should not use this directly from another application

@psalm-suppress MixedAssignment @psalm-suppress MixedMethodCall

Parameters

ParagonIE_Sodium_Core32_Curve25519_Fe $h:

Return value

string

Throws

SodiumException

TypeError

7 calls to ParagonIE_Sodium_Core32_Curve25519::fe_tobytes()

ParagonIE_Sodium_Core32_Curve25519::fe_isnegative in vendor/paragonie/sodium_compat/src/Core32/Curve25519.php

Is a field element negative? (1 = yes, 0 = no. Used in calculations.)

ParagonIE_Sodium_Core32_Curve25519::fe_isnonzero in vendor/paragonie/sodium_compat/src/Core32/Curve25519.php

Returns 0 if this field element results in all NUL bytes.

ParagonIE_Sodium_Core32_Curve25519::ge_p3_tobytes in vendor/paragonie/sodium_compat/src/Core32/Curve25519.php

@internal You should not use this directly from another application

ParagonIE_Sodium_Core32_Curve25519::ge_tobytes in vendor/paragonie/sodium_compat/src/Core32/Curve25519.php

Convert a group element to a byte string.

ParagonIE_Sodium_Core32_Ed25519::pk_to_curve25519 in vendor/paragonie/sodium_compat/src/Core32/Ed25519.php

... See full list

File

vendor/paragonie/sodium_compat/src/Core32/Curve25519.php, line 263

Class

ParagonIE_Sodium_Core32_Curve25519

Class ParagonIE_Sodium_Core32_Curve25519

Code

public static function fe_tobytes(ParagonIE_Sodium_Core32_Curve25519_Fe $h) {

  /**
   * @var ParagonIE_Sodium_Core32_Int64[] $f
   * @var ParagonIE_Sodium_Core32_Int64 $q
   */
  $f = array();
  for ($i = 0; $i < 10; ++$i) {
    $f[$i] = $h[$i]
      ->toInt64();
  }
  $q = $f[9]
    ->mulInt(19, 5)
    ->addInt(1 << 14)
    ->shiftRight(25)
    ->addInt64($f[0])
    ->shiftRight(26)
    ->addInt64($f[1])
    ->shiftRight(25)
    ->addInt64($f[2])
    ->shiftRight(26)
    ->addInt64($f[3])
    ->shiftRight(25)
    ->addInt64($f[4])
    ->shiftRight(26)
    ->addInt64($f[5])
    ->shiftRight(25)
    ->addInt64($f[6])
    ->shiftRight(26)
    ->addInt64($f[7])
    ->shiftRight(25)
    ->addInt64($f[8])
    ->shiftRight(26)
    ->addInt64($f[9])
    ->shiftRight(25);
  $f[0] = $f[0]
    ->addInt64($q
    ->mulInt(19, 5));
  $carry0 = $f[0]
    ->shiftRight(26);
  $f[1] = $f[1]
    ->addInt64($carry0);
  $f[0] = $f[0]
    ->subInt64($carry0
    ->shiftLeft(26));
  $carry1 = $f[1]
    ->shiftRight(25);
  $f[2] = $f[2]
    ->addInt64($carry1);
  $f[1] = $f[1]
    ->subInt64($carry1
    ->shiftLeft(25));
  $carry2 = $f[2]
    ->shiftRight(26);
  $f[3] = $f[3]
    ->addInt64($carry2);
  $f[2] = $f[2]
    ->subInt64($carry2
    ->shiftLeft(26));
  $carry3 = $f[3]
    ->shiftRight(25);
  $f[4] = $f[4]
    ->addInt64($carry3);
  $f[3] = $f[3]
    ->subInt64($carry3
    ->shiftLeft(25));
  $carry4 = $f[4]
    ->shiftRight(26);
  $f[5] = $f[5]
    ->addInt64($carry4);
  $f[4] = $f[4]
    ->subInt64($carry4
    ->shiftLeft(26));
  $carry5 = $f[5]
    ->shiftRight(25);
  $f[6] = $f[6]
    ->addInt64($carry5);
  $f[5] = $f[5]
    ->subInt64($carry5
    ->shiftLeft(25));
  $carry6 = $f[6]
    ->shiftRight(26);
  $f[7] = $f[7]
    ->addInt64($carry6);
  $f[6] = $f[6]
    ->subInt64($carry6
    ->shiftLeft(26));
  $carry7 = $f[7]
    ->shiftRight(25);
  $f[8] = $f[8]
    ->addInt64($carry7);
  $f[7] = $f[7]
    ->subInt64($carry7
    ->shiftLeft(25));
  $carry8 = $f[8]
    ->shiftRight(26);
  $f[9] = $f[9]
    ->addInt64($carry8);
  $f[8] = $f[8]
    ->subInt64($carry8
    ->shiftLeft(26));
  $carry9 = $f[9]
    ->shiftRight(25);
  $f[9] = $f[9]
    ->subInt64($carry9
    ->shiftLeft(25));

  /** @var int $h0 */
  $h0 = $f[0]
    ->toInt32()
    ->toInt();

  /** @var int $h1 */
  $h1 = $f[1]
    ->toInt32()
    ->toInt();

  /** @var int $h2 */
  $h2 = $f[2]
    ->toInt32()
    ->toInt();

  /** @var int $h3 */
  $h3 = $f[3]
    ->toInt32()
    ->toInt();

  /** @var int $h4 */
  $h4 = $f[4]
    ->toInt32()
    ->toInt();

  /** @var int $h5 */
  $h5 = $f[5]
    ->toInt32()
    ->toInt();

  /** @var int $h6 */
  $h6 = $f[6]
    ->toInt32()
    ->toInt();

  /** @var int $h7 */
  $h7 = $f[7]
    ->toInt32()
    ->toInt();

  /** @var int $h8 */
  $h8 = $f[8]
    ->toInt32()
    ->toInt();

  /** @var int $h9 */
  $h9 = $f[9]
    ->toInt32()
    ->toInt();

  /**
   * @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);
}