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<?php /** * Class ParagonIE_Sodium_Core_Base64 * * Copyright (c) 2016 - 2018 Paragon Initiative Enterprises. * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) * * We have to copy/paste the contents into the variant files because PHP 5.2 * doesn't support late static binding, and we have no better workaround * available that won't break PHP 7+. Therefore, we're forced to duplicate code. */ abstract class ParagonIE_Sodium_Core_Base64_Common { /** * 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; } /** * 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 $src * @return int */ abstract protected static function decode6Bits($src); /** * Uses bitwise operators instead of table-lookups to turn 8-bit integers * into 6-bit integers. * * @param int $src * @return string */ abstract protected static function encode6Bits($src); }
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