class ParagonIE_Sodium_Core_Base64_Original in Automatic Updates 7

Class ParagonIE_Sodium_Core_Base64

Copyright (c) 2016 - 2018 Paragon Initiative Enterprises. Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)

Hierarchy

• class \ParagonIE_Sodium_Core_Base64_Original

File

vendor/paragonie/sodium_compat/src/Core/Base64/Original.php, line 9

class ParagonIE_Sodium_Core_Base64_Original {

  // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE

  /**
   * Encode into Base64
   *
   * Base64 character set "[A-Z][a-z][0-9]+/"
   *
   * @param string $src
   * @return string
   * @throws TypeError
   */
  public static function encode($src) {
    return self::doEncode($src, true);
  }

  /**
   * Encode into Base64, no = padding
   *
   * Base64 character set "[A-Z][a-z][0-9]+/"
   *
   * @param string $src
   * @return string
   * @throws TypeError
   */
  public static function encodeUnpadded($src) {
    return self::doEncode($src, false);
  }

  /**
   * @param string $src
   * @param bool $pad   Include = padding?
   * @return string
   * @throws TypeError
   */
  protected static function doEncode($src, $pad = true) {
    $dest = '';
    $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);

    // Main loop (no padding):
    for ($i = 0; $i + 3 <= $srcLen; $i += 3) {

      /** @var array<int, int> $chunk */
      $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
      $b0 = $chunk[1];
      $b1 = $chunk[2];
      $b2 = $chunk[3];
      $dest .= self::encode6Bits($b0 >> 2) . self::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . self::encode6Bits(($b1 << 2 | $b2 >> 6) & 63) . self::encode6Bits($b2 & 63);
    }

    // The last chunk, which may have padding:
    if ($i < $srcLen) {

      /** @var array<int, int> $chunk */
      $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
      $b0 = $chunk[1];
      if ($i + 1 < $srcLen) {
        $b1 = $chunk[2];
        $dest .= self::encode6Bits($b0 >> 2) . self::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . self::encode6Bits($b1 << 2 & 63);
        if ($pad) {
          $dest .= '=';
        }
      }
      else {
        $dest .= self::encode6Bits($b0 >> 2) . self::encode6Bits($b0 << 4 & 63);
        if ($pad) {
          $dest .= '==';
        }
      }
    }
    return $dest;
  }

  /**
   * decode from base64 into binary
   *
   * Base64 character set "./[A-Z][a-z][0-9]"
   *
   * @param string $src
   * @param bool $strictPadding
   * @return string
   * @throws RangeException
   * @throws TypeError
   * @psalm-suppress RedundantCondition
   */
  public static function decode($src, $strictPadding = false) {

    // Remove padding
    $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
    if ($srcLen === 0) {
      return '';
    }
    if ($strictPadding) {
      if (($srcLen & 3) === 0) {
        if ($src[$srcLen - 1] === '=') {
          $srcLen--;
          if ($src[$srcLen - 1] === '=') {
            $srcLen--;
          }
        }
      }
      if (($srcLen & 3) === 1) {
        throw new RangeException('Incorrect padding');
      }
      if ($src[$srcLen - 1] === '=') {
        throw new RangeException('Incorrect padding');
      }
    }
    else {
      $src = rtrim($src, '=');
      $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
    }
    $err = 0;
    $dest = '';

    // Main loop (no padding):
    for ($i = 0; $i + 4 <= $srcLen; $i += 4) {

      /** @var array<int, int> $chunk */
      $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
      $c0 = self::decode6Bits($chunk[1]);
      $c1 = self::decode6Bits($chunk[2]);
      $c2 = self::decode6Bits($chunk[3]);
      $c3 = self::decode6Bits($chunk[4]);
      $dest .= pack('CCC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff, ($c2 << 6 | $c3) & 0xff);
      $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
    }

    // The last chunk, which may have padding:
    if ($i < $srcLen) {

      /** @var array<int, int> $chunk */
      $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
      $c0 = self::decode6Bits($chunk[1]);
      if ($i + 2 < $srcLen) {
        $c1 = self::decode6Bits($chunk[2]);
        $c2 = self::decode6Bits($chunk[3]);
        $dest .= pack('CC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff);
        $err |= ($c0 | $c1 | $c2) >> 8;
      }
      elseif ($i + 1 < $srcLen) {
        $c1 = self::decode6Bits($chunk[2]);
        $dest .= pack('C', ($c0 << 2 | $c1 >> 4) & 0xff);
        $err |= ($c0 | $c1) >> 8;
      }
      elseif ($i < $srcLen && $strictPadding) {
        $err |= 1;
      }
    }

    /** @var bool $check */
    $check = $err === 0;
    if (!$check) {
      throw new RangeException('Base64::decode() only expects characters in the correct base64 alphabet');
    }
    return $dest;
  }

  // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE

  /**
   * Uses bitwise operators instead of table-lookups to turn 6-bit integers
   * into 8-bit integers.
   *
   * Base64 character set:
   * [A-Z]      [a-z]      [0-9]      +     /
   * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
   *
   * @param int $src
   * @return int
   */
  protected static function decode6Bits($src) {
    $ret = -1;

    // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
    $ret += (0x40 - $src & $src - 0x5b) >> 8 & $src - 64;

    // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
    $ret += (0x60 - $src & $src - 0x7b) >> 8 & $src - 70;

    // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
    $ret += (0x2f - $src & $src - 0x3a) >> 8 & $src + 5;

    // if ($src == 0x2b) $ret += 62 + 1;
    $ret += (0x2a - $src & $src - 0x2c) >> 8 & 63;

    // if ($src == 0x2f) ret += 63 + 1;
    $ret += (0x2e - $src & $src - 0x30) >> 8 & 64;
    return $ret;
  }

  /**
   * Uses bitwise operators instead of table-lookups to turn 8-bit integers
   * into 6-bit integers.
   *
   * @param int $src
   * @return string
   */
  protected static function encode6Bits($src) {
    $diff = 0x41;

    // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
    $diff += 25 - $src >> 8 & 6;

    // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
    $diff -= 51 - $src >> 8 & 75;

    // if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
    $diff -= 61 - $src >> 8 & 15;

    // if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
    $diff += 62 - $src >> 8 & 3;
    return pack('C', $src + $diff);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
ParagonIE_Sodium_Core_Base64_Original::decode	public static	function	decode from base64 into binary
ParagonIE_Sodium_Core_Base64_Original::decode6Bits	protected static	function	Uses bitwise operators instead of table-lookups to turn 6-bit integers into 8-bit integers.
ParagonIE_Sodium_Core_Base64_Original::doEncode	protected static	function
ParagonIE_Sodium_Core_Base64_Original::encode	public static	function	Encode into Base64
ParagonIE_Sodium_Core_Base64_Original::encode6Bits	protected static	function	Uses bitwise operators instead of table-lookups to turn 8-bit integers into 6-bit integers.
ParagonIE_Sodium_Core_Base64_Original::encodeUnpadded	public static	function	Encode into Base64, no = padding