272 lines
8.7 KiB
PHP
272 lines
8.7 KiB
PHP
<?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 Base64
|
|
* [A-Z][a-z][0-9]+/
|
|
*
|
|
* @package ParagonIE\ConstantTime
|
|
*/
|
|
abstract class Base64 implements EncoderInterface
|
|
{
|
|
/**
|
|
* Encode into Base64
|
|
*
|
|
* Base64 character set "[A-Z][a-z][0-9]+/"
|
|
*
|
|
* @param string $src
|
|
* @return string
|
|
* @throws \TypeError
|
|
*/
|
|
public static function encode(string $src): string
|
|
{
|
|
return static::doEncode($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(string $src): string
|
|
{
|
|
return static::doEncode($src, false);
|
|
}
|
|
|
|
/**
|
|
* @param string $src
|
|
* @param bool $pad Include = padding?
|
|
* @return string
|
|
* @throws \TypeError
|
|
*/
|
|
protected static function doEncode(string $src, bool $pad = true): string
|
|
{
|
|
$dest = '';
|
|
$srcLen = Binary::safeStrlen($src);
|
|
// Main loop (no padding):
|
|
for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
|
|
/** @var array<int, int> $chunk */
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 3));
|
|
$b0 = $chunk[1];
|
|
$b1 = $chunk[2];
|
|
$b2 = $chunk[3];
|
|
|
|
$dest .=
|
|
static::encode6Bits( $b0 >> 2 ) .
|
|
static::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
|
|
static::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
|
|
static::encode6Bits( $b2 & 63);
|
|
}
|
|
// The last chunk, which may have padding:
|
|
if ($i < $srcLen) {
|
|
/** @var array<int, int> $chunk */
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
|
|
$b0 = $chunk[1];
|
|
if ($i + 1 < $srcLen) {
|
|
$b1 = $chunk[2];
|
|
$dest .=
|
|
static::encode6Bits($b0 >> 2) .
|
|
static::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
|
|
static::encode6Bits(($b1 << 2) & 63);
|
|
if ($pad) {
|
|
$dest .= '=';
|
|
}
|
|
} else {
|
|
$dest .=
|
|
static::encode6Bits( $b0 >> 2) .
|
|
static::encode6Bits(($b0 << 4) & 63);
|
|
if ($pad) {
|
|
$dest .= '==';
|
|
}
|
|
}
|
|
}
|
|
return $dest;
|
|
}
|
|
|
|
/**
|
|
* decode from base64 into binary
|
|
*
|
|
* Base64 character set "./[A-Z][a-z][0-9]"
|
|
*
|
|
* @param string $encodedString
|
|
* @param bool $strictPadding
|
|
* @return string
|
|
* @throws \RangeException
|
|
* @throws \TypeError
|
|
* @psalm-suppress RedundantCondition
|
|
*/
|
|
public static function decode(string $encodedString, bool $strictPadding = false): string
|
|
{
|
|
// Remove padding
|
|
$srcLen = Binary::safeStrlen($encodedString);
|
|
if ($srcLen === 0) {
|
|
return '';
|
|
}
|
|
|
|
if ($strictPadding) {
|
|
if (($srcLen & 3) === 0) {
|
|
if ($encodedString[$srcLen - 1] === '=') {
|
|
$srcLen--;
|
|
if ($encodedString[$srcLen - 1] === '=') {
|
|
$srcLen--;
|
|
}
|
|
}
|
|
}
|
|
if (($srcLen & 3) === 1) {
|
|
throw new \RangeException(
|
|
'Incorrect padding'
|
|
);
|
|
}
|
|
if ($encodedString[$srcLen - 1] === '=') {
|
|
throw new \RangeException(
|
|
'Incorrect padding'
|
|
);
|
|
}
|
|
} else {
|
|
$encodedString = \rtrim($encodedString, '=');
|
|
$srcLen = Binary::safeStrlen($encodedString);
|
|
}
|
|
|
|
$err = 0;
|
|
$dest = '';
|
|
// Main loop (no padding):
|
|
for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
|
|
/** @var array<int, int> $chunk */
|
|
$chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, 4));
|
|
$c0 = static::decode6Bits($chunk[1]);
|
|
$c1 = static::decode6Bits($chunk[2]);
|
|
$c2 = static::decode6Bits($chunk[3]);
|
|
$c3 = static::decode6Bits($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 */
|
|
$chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, $srcLen - $i));
|
|
$c0 = static::decode6Bits($chunk[1]);
|
|
|
|
if ($i + 2 < $srcLen) {
|
|
$c1 = static::decode6Bits($chunk[2]);
|
|
$c2 = static::decode6Bits($chunk[3]);
|
|
$dest .= \pack(
|
|
'CC',
|
|
((($c0 << 2) | ($c1 >> 4)) & 0xff),
|
|
((($c1 << 4) | ($c2 >> 2)) & 0xff)
|
|
);
|
|
$err |= ($c0 | $c1 | $c2) >> 8;
|
|
} elseif ($i + 1 < $srcLen) {
|
|
$c1 = static::decode6Bits($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
|
|
*/
|
|
protected static function decode6Bits(int $src): int
|
|
{
|
|
$ret = -1;
|
|
|
|
// if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
|
|
$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
|
|
|
|
// if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
|
|
$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);
|
|
|
|
// if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
|
|
$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);
|
|
|
|
// if ($src == 0x2b) $ret += 62 + 1;
|
|
$ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;
|
|
|
|
// if ($src == 0x2f) ret += 63 + 1;
|
|
$ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Uses bitwise operators instead of table-lookups to turn 8-bit integers
|
|
* into 6-bit integers.
|
|
*
|
|
* @param int $src
|
|
* @return string
|
|
*/
|
|
protected static function encode6Bits(int $src): string
|
|
{
|
|
$diff = 0x41;
|
|
|
|
// if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
|
|
$diff += ((25 - $src) >> 8) & 6;
|
|
|
|
// if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
|
|
$diff -= ((51 - $src) >> 8) & 75;
|
|
|
|
// if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
|
|
$diff -= ((61 - $src) >> 8) & 15;
|
|
|
|
// if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
|
|
$diff += ((62 - $src) >> 8) & 3;
|
|
|
|
return \pack('C', $src + $diff);
|
|
}
|
|
}
|