diff options
Diffstat (limited to 'vendor/paragonie/constant_time_encoding/src/Base32Hex.php')
| -rw-r--r-- | vendor/paragonie/constant_time_encoding/src/Base32Hex.php | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/paragonie/constant_time_encoding/src/Base32Hex.php b/vendor/paragonie/constant_time_encoding/src/Base32Hex.php new file mode 100644 index 000000000..68fdad52c --- /dev/null +++ b/vendor/paragonie/constant_time_encoding/src/Base32Hex.php @@ -0,0 +1,111 @@ +<?php +declare(strict_types=1); +namespace ParagonIE\ConstantTime; + +/** + * Copyright (c) 2016 - 2018 Paragon Initiative Enterprises. + * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +/** + * Class Base32Hex + * [0-9][A-V] + * + * @package ParagonIE\ConstantTime + */ +abstract class Base32Hex extends Base32 +{ + /** + * Uses bitwise operators instead of table-lookups to turn 5-bit integers + * into 8-bit integers. + * + * @param int $src + * @return int + */ + protected static function decode5Bits(int $src): int + { + $ret = -1; + + // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47 + $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47); + + // if ($src > 0x60 && $src < 0x77) ret += $src - 0x61 + 10 + 1; // -86 + $ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86); + + return $ret; + } + + /** + * Uses bitwise operators instead of table-lookups to turn 5-bit integers + * into 8-bit integers. + * + * @param int $src + * @return int + */ + protected static function decode5BitsUpper(int $src): int + { + $ret = -1; + + // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47 + $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47); + + // if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54 + $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54); + + return $ret; + } + + /** + * Uses bitwise operators instead of table-lookups to turn 8-bit integers + * into 5-bit integers. + * + * @param int $src + * @return string + */ + protected static function encode5Bits(int $src): string + { + $src += 0x30; + + // if ($src > 0x39) $src += 0x61 - 0x3a; // 39 + $src += ((0x39 - $src) >> 8) & 39; + + return \pack('C', $src); + } + + /** + * Uses bitwise operators instead of table-lookups to turn 8-bit integers + * into 5-bit integers. + * + * Uppercase variant. + * + * @param int $src + * @return string + */ + protected static function encode5BitsUpper(int $src): string + { + $src += 0x30; + + // if ($src > 0x39) $src += 0x41 - 0x3a; // 7 + $src += ((0x39 - $src) >> 8) & 7; + + return \pack('C', $src); + } +}
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