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David Stone
257
dependencies/paragonie/constant_time_encoding/src/Base64.php
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257
dependencies/paragonie/constant_time_encoding/src/Base64.php
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<?php
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declare (strict_types=1);
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namespace WP_Ultimo\Dependencies\ParagonIE\ConstantTime;
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use InvalidArgumentException;
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use RangeException;
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use TypeError;
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/**
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* Copyright (c) 2016 - 2022 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 Base64
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* [A-Z][a-z][0-9]+/
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*
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* @package ParagonIE\ConstantTime
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*/
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abstract class Base64 implements EncoderInterface
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{
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/**
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* Encode into Base64
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*
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* Base64 character set "[A-Z][a-z][0-9]+/"
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*
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* @param string $binString
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* @return string
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*
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* @throws TypeError
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*/
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public static function encode(string $binString) : string
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{
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return static::doEncode($binString, \true);
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}
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/**
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* Encode into Base64, no = padding
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*
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* Base64 character set "[A-Z][a-z][0-9]+/"
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*
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* @param string $src
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* @return string
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*
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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);
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}
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/**
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* @param string $src
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* @param bool $pad Include = padding?
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* @return string
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*
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* @throws TypeError
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*/
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protected static function doEncode(string $src, bool $pad = \true) : string
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{
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$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 + 3 <= $srcLen; $i += 3) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 3));
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$b0 = $chunk[1];
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$b1 = $chunk[2];
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$b2 = $chunk[3];
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$dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . static::encode6Bits(($b1 << 2 | $b2 >> 6) & 63) . static::encode6Bits($b2 & 63);
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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 + 1 < $srcLen) {
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$b1 = $chunk[2];
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$dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . static::encode6Bits($b1 << 2 & 63);
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if ($pad) {
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$dest .= '=';
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}
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} else {
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$dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits($b0 << 4 & 63);
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if ($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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* decode from base64 into binary
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*
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* Base64 character set "./[A-Z][a-z][0-9]"
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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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* @throws RangeException
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* @throws TypeError
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* @psalm-suppress RedundantCondition
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*/
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public static function decode(string $encodedString, bool $strictPadding = \false) : string
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{
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// Remove padding
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$srcLen = Binary::safeStrlen($encodedString);
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if ($srcLen === 0) {
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return '';
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}
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if ($strictPadding) {
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if (($srcLen & 3) === 0) {
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if ($encodedString[$srcLen - 1] === '=') {
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$srcLen--;
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if ($encodedString[$srcLen - 1] === '=') {
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$srcLen--;
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}
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}
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}
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if (($srcLen & 3) === 1) {
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throw new RangeException('Incorrect padding');
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}
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if ($encodedString[$srcLen - 1] === '=') {
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throw new RangeException('Incorrect padding');
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}
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} else {
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$encodedString = \rtrim($encodedString, '=');
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$srcLen = Binary::safeStrlen($encodedString);
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}
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$err = 0;
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$dest = '';
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// Main loop (no padding):
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for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, 4));
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$c0 = static::decode6Bits($chunk[1]);
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$c1 = static::decode6Bits($chunk[2]);
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$c2 = static::decode6Bits($chunk[3]);
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$c3 = static::decode6Bits($chunk[4]);
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$dest .= \pack('CCC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff, ($c2 << 6 | $c3) & 0xff);
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$err |= ($c0 | $c1 | $c2 | $c3) >> 8;
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}
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// The last chunk, which may have padding:
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if ($i < $srcLen) {
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/** @var array<int, int> $chunk */
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$chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, $srcLen - $i));
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$c0 = static::decode6Bits($chunk[1]);
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if ($i + 2 < $srcLen) {
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$c1 = static::decode6Bits($chunk[2]);
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$c2 = static::decode6Bits($chunk[3]);
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$dest .= \pack('CC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff);
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$err |= ($c0 | $c1 | $c2) >> 8;
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if ($strictPadding) {
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$err |= $c2 << 6 & 0xff;
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}
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} elseif ($i + 1 < $srcLen) {
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$c1 = static::decode6Bits($chunk[2]);
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$dest .= \pack('C', ($c0 << 2 | $c1 >> 4) & 0xff);
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$err |= ($c0 | $c1) >> 8;
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if ($strictPadding) {
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$err |= $c1 << 4 & 0xff;
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}
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} elseif ($strictPadding) {
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$err |= 1;
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}
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}
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$check = $err === 0;
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if (!$check) {
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throw new RangeException('Base64::decode() only expects characters in the correct base64 alphabet');
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}
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return $dest;
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}
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/**
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* @param string $encodedString
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* @return string
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*/
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public static function decodeNoPadding(string $encodedString) : string
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{
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$srcLen = Binary::safeStrlen($encodedString);
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if ($srcLen === 0) {
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return '';
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}
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if (($srcLen & 3) === 0) {
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if ($encodedString[$srcLen - 1] === '=') {
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throw new InvalidArgumentException("decodeNoPadding() doesn't tolerate padding");
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}
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if (($srcLen & 3) > 1) {
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if ($encodedString[$srcLen - 2] === '=') {
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throw new InvalidArgumentException("decodeNoPadding() doesn't tolerate padding");
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}
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}
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}
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return static::decode($encodedString, \true);
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}
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/**
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* Uses bitwise operators instead of table-lookups to turn 6-bit integers
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* into 8-bit integers.
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*
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* Base64 character set:
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* [A-Z] [a-z] [0-9] + /
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* 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
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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 decode6Bits(int $src) : int
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{
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$ret = -1;
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// if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
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$ret += (0x40 - $src & $src - 0x5b) >> 8 & $src - 64;
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// if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
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$ret += (0x60 - $src & $src - 0x7b) >> 8 & $src - 70;
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// if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
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$ret += (0x2f - $src & $src - 0x3a) >> 8 & $src + 5;
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// if ($src == 0x2b) $ret += 62 + 1;
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$ret += (0x2a - $src & $src - 0x2c) >> 8 & 63;
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// if ($src == 0x2f) ret += 63 + 1;
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$ret += (0x2e - $src & $src - 0x30) >> 8 & 64;
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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 6-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 encode6Bits(int $src) : string
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{
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$diff = 0x41;
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// if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
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$diff += 25 - $src >> 8 & 6;
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// if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
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$diff -= 51 - $src >> 8 & 75;
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// if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
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$diff -= 61 - $src >> 8 & 15;
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// if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
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$diff += 62 - $src >> 8 & 3;
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return \pack('C', $src + $diff);
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}
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}
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