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Merge pull request #95 from paragonie/v1-11-0
Missing features from polyfill, closes #92
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,213 @@ | ||
| <?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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