forked from GNUsocial/gnu-social
110 lines
3.3 KiB
PHP
110 lines
3.3 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 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 $src
|
|
* @return int
|
|
*/
|
|
protected static function decode5Bits($src)
|
|
{
|
|
$ret = -1;
|
|
|
|
// if ($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 $src
|
|
* @return int
|
|
*/
|
|
protected static function decode5BitsUpper($src)
|
|
{
|
|
$ret = -1;
|
|
|
|
// if ($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 $src
|
|
* @return string
|
|
*/
|
|
protected static function encode5Bits($src)
|
|
{
|
|
$src += 0x30;
|
|
|
|
// if ($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 $src
|
|
* @return string
|
|
*/
|
|
protected static function encode5BitsUpper($src)
|
|
{
|
|
$src += 0x30;
|
|
|
|
// if ($src > 0x39) $src += 0x41 - 0x3a; // 7
|
|
$src += ((0x39 - $src) >> 8) & 7;
|
|
|
|
return \pack('C', $src);
|
|
}
|
|
} |