472 lines
16 KiB
PHP
472 lines
16 KiB
PHP
<?php
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declare(strict_types=1);
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namespace ParagonIE\ConstantTime;
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/**
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* Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
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* Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/**
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* Class Base32
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* [A-Z][2-7]
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*
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* @package ParagonIE\ConstantTime
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*/
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abstract class Base32 implements EncoderInterface
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{
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/**
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* Decode a Base32-encoded string into raw binary
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*
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* @param string $encodedString
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* @param bool $strictPadding
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* @return string
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*/
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public static function decode(string $encodedString, bool $strictPadding = false): string
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{
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return static::doDecode($encodedString, false, $strictPadding);
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}
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/**
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* Decode an uppercase Base32-encoded string into raw binary
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*
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* @param string $src
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* @param bool $strictPadding
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* @return string
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*/
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public static function decodeUpper(string $src, bool $strictPadding = false): string
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{
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return static::doDecode($src, true, $strictPadding);
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}
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/**
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* Encode into Base32 (RFC 4648)
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*
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* @param string $src
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* @return string
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* @throws \TypeError
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*/
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public static function encode(string $src): string
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{
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return static::doEncode($src, false, true);
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}
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/**
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* Encode into Base32 (RFC 4648)
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*
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* @param string $src
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* @return string
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* @throws \TypeError
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*/
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public static function encodeUnpadded(string $src): string
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{
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return static::doEncode($src, false, false);
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}
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/**
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* Encode into uppercase Base32 (RFC 4648)
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*
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* @param string $src
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* @return string
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* @throws \TypeError
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*/
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public static function encodeUpper(string $src): string
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{
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return static::doEncode($src, true, true);
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}
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/**
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* Encode into uppercase Base32 (RFC 4648)
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*
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* @param string $src
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* @return string
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* @throws \TypeError
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*/
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public static function encodeUpperUnpadded(string $src): string
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{
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return static::doEncode($src, true, false);
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}
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/**
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* Uses bitwise operators instead of table-lookups to turn 5-bit integers
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* into 8-bit integers.
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*
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* @param int $src
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* @return int
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*/
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protected static function decode5Bits(int $src): int
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{
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$ret = -1;
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// if ($src > 96 && $src < 123) $ret += $src - 97 + 1; // -64
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$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 96);
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// if ($src > 0x31 && $src < 0x38) $ret += $src - 24 + 1; // -23
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$ret += (((0x31 - $src) & ($src - 0x38)) >> 8) & ($src - 23);
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return $ret;
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}
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/**
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* Uses bitwise operators instead of table-lookups to turn 5-bit integers
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* into 8-bit integers.
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*
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* Uppercase variant.
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*
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* @param int $src
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* @return int
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*/
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protected static function decode5BitsUpper(int $src): int
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{
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$ret = -1;
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// if ($src > 64 && $src < 91) $ret += $src - 65 + 1; // -64
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$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
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// if ($src > 0x31 && $src < 0x38) $ret += $src - 24 + 1; // -23
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$ret += (((0x31 - $src) & ($src - 0x38)) >> 8) & ($src - 23);
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return $ret;
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}
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/**
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* Uses bitwise operators instead of table-lookups to turn 8-bit integers
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* into 5-bit integers.
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*
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* @param int $src
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* @return string
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*/
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protected static function encode5Bits(int $src): string
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{
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$diff = 0x61;
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// if ($src > 25) $ret -= 72;
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$diff -= ((25 - $src) >> 8) & 73;
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return \pack('C', $src + $diff);
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}
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/**
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* Uses bitwise operators instead of table-lookups to turn 8-bit integers
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* into 5-bit integers.
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*
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* Uppercase variant.
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*
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* @param int $src
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* @return string
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*/
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protected static function encode5BitsUpper(int $src): string
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{
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$diff = 0x41;
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// if ($src > 25) $ret -= 40;
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$diff -= ((25 - $src) >> 8) & 41;
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return \pack('C', $src + $diff);
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}
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/**
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* Base32 decoding
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*
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* @param string $src
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* @param bool $upper
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* @param bool $strictPadding
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* @return string
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* @throws \TypeError
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* @psalm-suppress RedundantCondition
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*/
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protected static function doDecode(string $src, bool $upper = false, bool $strictPadding = false): string
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{
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// We do this to reduce code duplication:
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$method = $upper
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? 'decode5BitsUpper'
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: 'decode5Bits';
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// Remove padding
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$srcLen = Binary::safeStrlen($src);
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if ($srcLen === 0) {
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return '';
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}
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if ($strictPadding) {
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if (($srcLen & 7) === 0) {
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for ($j = 0; $j < 7; ++$j) {
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if ($src[$srcLen - 1] === '=') {
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$srcLen--;
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} else {
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break;
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}
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}
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}
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if (($srcLen & 7) === 1) {
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throw new \RangeException(
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'Incorrect padding'
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);
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}
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} else {
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$src = \rtrim($src, '=');
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$srcLen = Binary::safeStrlen($src);
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}
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$err = 0;
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$dest = '';
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// Main loop (no padding):
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for ($i = 0; $i + 8 <= $srcLen; $i += 8) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 8));
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/** @var int $c0 */
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$c0 = static::$method($chunk[1]);
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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/** @var int $c3 */
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$c3 = static::$method($chunk[4]);
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/** @var int $c4 */
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$c4 = static::$method($chunk[5]);
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/** @var int $c5 */
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$c5 = static::$method($chunk[6]);
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/** @var int $c6 */
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$c6 = static::$method($chunk[7]);
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/** @var int $c7 */
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$c7 = static::$method($chunk[8]);
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$dest .= \pack(
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'CCCCC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
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(($c3 << 4) | ($c4 >> 1) ) & 0xff,
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(($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff,
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(($c6 << 5) | ($c7 ) ) & 0xff
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);
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$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5 | $c6 | $c7) >> 8;
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}
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// The last chunk, which may have padding:
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if ($i < $srcLen) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
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/** @var int $c0 */
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$c0 = static::$method($chunk[1]);
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if ($i + 6 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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/** @var int $c3 */
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$c3 = static::$method($chunk[4]);
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/** @var int $c4 */
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$c4 = static::$method($chunk[5]);
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/** @var int $c5 */
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$c5 = static::$method($chunk[6]);
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/** @var int $c6 */
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$c6 = static::$method($chunk[7]);
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$dest .= \pack(
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'CCCC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
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(($c3 << 4) | ($c4 >> 1) ) & 0xff,
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(($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff
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);
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$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5 | $c6) >> 8;
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} elseif ($i + 5 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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/** @var int $c3 */
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$c3 = static::$method($chunk[4]);
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/** @var int $c4 */
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$c4 = static::$method($chunk[5]);
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/** @var int $c5 */
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$c5 = static::$method($chunk[6]);
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$dest .= \pack(
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'CCCC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
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(($c3 << 4) | ($c4 >> 1) ) & 0xff,
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(($c4 << 7) | ($c5 << 2) ) & 0xff
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);
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$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5) >> 8;
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} elseif ($i + 4 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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/** @var int $c3 */
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$c3 = static::$method($chunk[4]);
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/** @var int $c4 */
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$c4 = static::$method($chunk[5]);
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$dest .= \pack(
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'CCC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
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(($c3 << 4) | ($c4 >> 1) ) & 0xff
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);
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$err |= ($c0 | $c1 | $c2 | $c3 | $c4) >> 8;
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} elseif ($i + 3 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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/** @var int $c3 */
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$c3 = static::$method($chunk[4]);
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$dest .= \pack(
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'CC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff
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);
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$err |= ($c0 | $c1 | $c2 | $c3) >> 8;
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} elseif ($i + 2 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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/** @var int $c2 */
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$c2 = static::$method($chunk[3]);
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$dest .= \pack(
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'CC',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff,
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(($c1 << 6) | ($c2 << 1) ) & 0xff
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);
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$err |= ($c0 | $c1 | $c2) >> 8;
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} elseif ($i + 1 < $srcLen) {
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/** @var int $c1 */
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$c1 = static::$method($chunk[2]);
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$dest .= \pack(
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'C',
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(($c0 << 3) | ($c1 >> 2) ) & 0xff
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);
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$err |= ($c0 | $c1) >> 8;
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} else {
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$dest .= \pack(
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'C',
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(($c0 << 3) ) & 0xff
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);
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$err |= ($c0) >> 8;
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}
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}
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/** @var bool $check */
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$check = ($err === 0);
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if (!$check) {
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throw new \RangeException(
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'Base32::doDecode() only expects characters in the correct base32 alphabet'
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);
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}
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return $dest;
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}
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/**
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* Base32 Encoding
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*
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* @param string $src
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* @param bool $upper
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* @param bool $pad
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* @return string
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* @throws \TypeError
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*/
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protected static function doEncode(string $src, bool $upper = false, $pad = true): string
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{
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// We do this to reduce code duplication:
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$method = $upper
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? 'encode5BitsUpper'
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: 'encode5Bits';
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$dest = '';
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$srcLen = Binary::safeStrlen($src);
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// Main loop (no padding):
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for ($i = 0; $i + 5 <= $srcLen; $i += 5) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 5));
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$b0 = $chunk[1];
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$b1 = $chunk[2];
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$b2 = $chunk[3];
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$b3 = $chunk[4];
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$b4 = $chunk[5];
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$dest .=
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static::$method( ($b0 >> 3) & 31) .
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static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
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static::$method((($b1 >> 1) ) & 31) .
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static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
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static::$method((($b2 << 1) | ($b3 >> 7)) & 31) .
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static::$method((($b3 >> 2) ) & 31) .
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static::$method((($b3 << 3) | ($b4 >> 5)) & 31) .
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static::$method( $b4 & 31);
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}
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// The last chunk, which may have padding:
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if ($i < $srcLen) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
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$b0 = $chunk[1];
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if ($i + 3 < $srcLen) {
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$b1 = $chunk[2];
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$b2 = $chunk[3];
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$b3 = $chunk[4];
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$dest .=
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static::$method( ($b0 >> 3) & 31) .
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static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
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static::$method((($b1 >> 1) ) & 31) .
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static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
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static::$method((($b2 << 1) | ($b3 >> 7)) & 31) .
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static::$method((($b3 >> 2) ) & 31) .
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static::$method((($b3 << 3) ) & 31);
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if ($pad) {
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$dest .= '=';
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}
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} elseif ($i + 2 < $srcLen) {
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$b1 = $chunk[2];
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$b2 = $chunk[3];
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$dest .=
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static::$method( ($b0 >> 3) & 31) .
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static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
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static::$method((($b1 >> 1) ) & 31) .
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static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
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static::$method((($b2 << 1) ) & 31);
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if ($pad) {
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$dest .= '===';
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}
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} elseif ($i + 1 < $srcLen) {
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$b1 = $chunk[2];
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$dest .=
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static::$method( ($b0 >> 3) & 31) .
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static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
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static::$method((($b1 >> 1) ) & 31) .
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static::$method((($b1 << 4) ) & 31);
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if ($pad) {
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$dest .= '====';
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}
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} else {
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$dest .=
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static::$method( ($b0 >> 3) & 31) .
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static::$method( ($b0 << 2) & 31);
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if ($pad) {
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$dest .= '======';
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}
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}
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}
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return $dest;
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}
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}
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