public static function ParagonIE_Sodium_Core_Salsa20::core_salsa20 in Automatic Updates 7

Same name and namespace in other branches

1. 8 vendor/paragonie/sodium_compat/src/Core/Salsa20.php \ParagonIE_Sodium_Core_Salsa20::core_salsa20()

Calculate an salsa20 hash of a single block

@internal You should not use this directly from another application

Parameters

string $in:

string $k:

string|null $c:

Return value

string

Throws

TypeError

2 calls to ParagonIE_Sodium_Core_Salsa20::core_salsa20()

ParagonIE_Sodium_Core_Salsa20::salsa20 in vendor/paragonie/sodium_compat/src/Core/Salsa20.php

@internal You should not use this directly from another application

ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic in vendor/paragonie/sodium_compat/src/Core/Salsa20.php

@internal You should not use this directly from another application

File

vendor/paragonie/sodium_compat/src/Core/Salsa20.php, line 25

Class

ParagonIE_Sodium_Core_Salsa20

Class ParagonIE_Sodium_Core_Salsa20

Code

public static function core_salsa20($in, $k, $c = null) {
  if (self::strlen($k) < 32) {
    throw new RangeException('Key must be 32 bytes long');
  }
  if ($c === null) {
    $j0 = $x0 = 0x61707865;
    $j5 = $x5 = 0x3320646e;
    $j10 = $x10 = 0x79622d32;
    $j15 = $x15 = 0x6b206574;
  }
  else {
    $j0 = $x0 = self::load_4(self::substr($c, 0, 4));
    $j5 = $x5 = self::load_4(self::substr($c, 4, 4));
    $j10 = $x10 = self::load_4(self::substr($c, 8, 4));
    $j15 = $x15 = self::load_4(self::substr($c, 12, 4));
  }
  $j1 = $x1 = self::load_4(self::substr($k, 0, 4));
  $j2 = $x2 = self::load_4(self::substr($k, 4, 4));
  $j3 = $x3 = self::load_4(self::substr($k, 8, 4));
  $j4 = $x4 = self::load_4(self::substr($k, 12, 4));
  $j6 = $x6 = self::load_4(self::substr($in, 0, 4));
  $j7 = $x7 = self::load_4(self::substr($in, 4, 4));
  $j8 = $x8 = self::load_4(self::substr($in, 8, 4));
  $j9 = $x9 = self::load_4(self::substr($in, 12, 4));
  $j11 = $x11 = self::load_4(self::substr($k, 16, 4));
  $j12 = $x12 = self::load_4(self::substr($k, 20, 4));
  $j13 = $x13 = self::load_4(self::substr($k, 24, 4));
  $j14 = $x14 = self::load_4(self::substr($k, 28, 4));
  for ($i = self::ROUNDS; $i > 0; $i -= 2) {
    $x4 ^= self::rotate($x0 + $x12, 7);
    $x8 ^= self::rotate($x4 + $x0, 9);
    $x12 ^= self::rotate($x8 + $x4, 13);
    $x0 ^= self::rotate($x12 + $x8, 18);
    $x9 ^= self::rotate($x5 + $x1, 7);
    $x13 ^= self::rotate($x9 + $x5, 9);
    $x1 ^= self::rotate($x13 + $x9, 13);
    $x5 ^= self::rotate($x1 + $x13, 18);
    $x14 ^= self::rotate($x10 + $x6, 7);
    $x2 ^= self::rotate($x14 + $x10, 9);
    $x6 ^= self::rotate($x2 + $x14, 13);
    $x10 ^= self::rotate($x6 + $x2, 18);
    $x3 ^= self::rotate($x15 + $x11, 7);
    $x7 ^= self::rotate($x3 + $x15, 9);
    $x11 ^= self::rotate($x7 + $x3, 13);
    $x15 ^= self::rotate($x11 + $x7, 18);
    $x1 ^= self::rotate($x0 + $x3, 7);
    $x2 ^= self::rotate($x1 + $x0, 9);
    $x3 ^= self::rotate($x2 + $x1, 13);
    $x0 ^= self::rotate($x3 + $x2, 18);
    $x6 ^= self::rotate($x5 + $x4, 7);
    $x7 ^= self::rotate($x6 + $x5, 9);
    $x4 ^= self::rotate($x7 + $x6, 13);
    $x5 ^= self::rotate($x4 + $x7, 18);
    $x11 ^= self::rotate($x10 + $x9, 7);
    $x8 ^= self::rotate($x11 + $x10, 9);
    $x9 ^= self::rotate($x8 + $x11, 13);
    $x10 ^= self::rotate($x9 + $x8, 18);
    $x12 ^= self::rotate($x15 + $x14, 7);
    $x13 ^= self::rotate($x12 + $x15, 9);
    $x14 ^= self::rotate($x13 + $x12, 13);
    $x15 ^= self::rotate($x14 + $x13, 18);
  }
  $x0 += $j0;
  $x1 += $j1;
  $x2 += $j2;
  $x3 += $j3;
  $x4 += $j4;
  $x5 += $j5;
  $x6 += $j6;
  $x7 += $j7;
  $x8 += $j8;
  $x9 += $j9;
  $x10 += $j10;
  $x11 += $j11;
  $x12 += $j12;
  $x13 += $j13;
  $x14 += $j14;
  $x15 += $j15;
  return self::store32_le($x0) . self::store32_le($x1) . self::store32_le($x2) . self::store32_le($x3) . self::store32_le($x4) . self::store32_le($x5) . self::store32_le($x6) . self::store32_le($x7) . self::store32_le($x8) . self::store32_le($x9) . self::store32_le($x10) . self::store32_le($x11) . self::store32_le($x12) . self::store32_le($x13) . self::store32_le($x14) . self::store32_le($x15);
}