88 lines
2.9 KiB
PHP
88 lines
2.9 KiB
PHP
<?php
|
|
namespace ParagonIE\ConstantTime;
|
|
|
|
/**
|
|
* Copyright (c) 2016 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 Base64DotSlash
|
|
* ./[A-Z][a-z][0-9]
|
|
*
|
|
* @package ParagonIE\ConstantTime
|
|
*/
|
|
abstract class Base64DotSlash extends Base64
|
|
{
|
|
/**
|
|
* 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]
|
|
* 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39
|
|
*
|
|
* @param int $src
|
|
* @return int
|
|
*/
|
|
protected static function decode6Bits($src)
|
|
{
|
|
$ret = -1;
|
|
|
|
// if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45
|
|
$ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45);
|
|
|
|
// if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62
|
|
$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62);
|
|
|
|
// if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68
|
|
$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68);
|
|
|
|
// if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7
|
|
$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7);
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Uses bitwise operators instead of table-lookups to turn 8-bit integers
|
|
* into 6-bit integers.
|
|
*
|
|
* @param int $src
|
|
* @return string
|
|
*/
|
|
protected static function encode6Bits($src)
|
|
{
|
|
$src += 0x2e;
|
|
|
|
// if ($src > 0x2f) $src += 0x41 - 0x30; // 17
|
|
$src += ((0x2f - $src) >> 8) & 17;
|
|
|
|
// if ($src > 0x5a) $src += 0x61 - 0x5b; // 6
|
|
$src += ((0x5a - $src) >> 8) & 6;
|
|
|
|
// if ($src > 0x7a) $src += 0x30 - 0x7b; // -75
|
|
$src -= ((0x7a - $src) >> 8) & 75;
|
|
|
|
return \pack('C', $src);
|
|
}
|
|
}
|