public function ParagonIE_Sodium_Core32_Poly1305_State::__construct in Automatic Updates 8

Same name and namespace in other branches

1. 7 vendor/paragonie/sodium_compat/src/Core32/Poly1305/State.php \ParagonIE_Sodium_Core32_Poly1305_State::__construct()

ParagonIE_Sodium_Core32_Poly1305_State constructor.

@internal You should not use this directly from another application

Parameters

string $key:

Throws

InvalidArgumentException

SodiumException

TypeError

File

vendor/paragonie/sodium_compat/src/Core32/Poly1305/State.php, line 52

Class

ParagonIE_Sodium_Core32_Poly1305_State

Class ParagonIE_Sodium_Core32_Poly1305_State

Code

public function __construct($key = '') {
  if (self::strlen($key) < 32) {
    throw new InvalidArgumentException('Poly1305 requires a 32-byte key');
  }

  /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
  $this->r = array(
    // st->r[0] = ...
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4))
      ->setUnsignedInt(true)
      ->mask(0x3ffffff),
    // st->r[1] = ...
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 3, 4))
      ->setUnsignedInt(true)
      ->shiftRight(2)
      ->mask(0x3ffff03),
    // st->r[2] = ...
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 6, 4))
      ->setUnsignedInt(true)
      ->shiftRight(4)
      ->mask(0x3ffc0ff),
    // st->r[3] = ...
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 9, 4))
      ->setUnsignedInt(true)
      ->shiftRight(6)
      ->mask(0x3f03fff),
    // st->r[4] = ...
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4))
      ->setUnsignedInt(true)
      ->shiftRight(8)
      ->mask(0xfffff),
  );

  /* h = 0 */
  $this->h = array(
    new ParagonIE_Sodium_Core32_Int32(array(
      0,
      0,
    ), true),
    new ParagonIE_Sodium_Core32_Int32(array(
      0,
      0,
    ), true),
    new ParagonIE_Sodium_Core32_Int32(array(
      0,
      0,
    ), true),
    new ParagonIE_Sodium_Core32_Int32(array(
      0,
      0,
    ), true),
    new ParagonIE_Sodium_Core32_Int32(array(
      0,
      0,
    ), true),
  );

  /* save pad for later */
  $this->pad = array(
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4))
      ->setUnsignedInt(true)
      ->toInt64(),
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4))
      ->setUnsignedInt(true)
      ->toInt64(),
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4))
      ->setUnsignedInt(true)
      ->toInt64(),
    ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4))
      ->setUnsignedInt(true)
      ->toInt64(),
  );
  $this->leftover = 0;
  $this->final = false;
}