389 lines
13 KiB
PHP
389 lines
13 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 Base32
|
|
* [A-Z][2-7]
|
|
*
|
|
* @package ParagonIE\ConstantTime
|
|
*/
|
|
abstract class Base32 implements EncoderInterface
|
|
{
|
|
/**
|
|
* Decode a Base32-encoded string into raw binary
|
|
*
|
|
* @param string $src
|
|
* @return string
|
|
*/
|
|
public static function decode($src)
|
|
{
|
|
return static::doDecode($src, false);
|
|
}
|
|
|
|
/**
|
|
* Decode an uppercase Base32-encoded string into raw binary
|
|
*
|
|
* @param string $src
|
|
* @return string
|
|
*/
|
|
public static function decodeUpper($src)
|
|
{
|
|
return static::doDecode($src, true);
|
|
}
|
|
|
|
/**
|
|
* Encode into Base32 (RFC 4648)
|
|
*
|
|
* @param string $src
|
|
* @return string
|
|
*/
|
|
public static function encode($src)
|
|
{
|
|
return static::doEncode($src, false);
|
|
}
|
|
|
|
/**
|
|
* Encode into uppercase Base32 (RFC 4648)
|
|
*
|
|
* @param string $src
|
|
* @return string
|
|
*/
|
|
public static function encodeUpper($src)
|
|
{
|
|
return static::doEncode($src, true);
|
|
}
|
|
|
|
/**
|
|
* 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 > 96 && $src < 123) $ret += $src - 97 + 1; // -64
|
|
$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 96);
|
|
|
|
// if ($src > 0x31 && $src < 0x38) $ret += $src - 24 + 1; // -23
|
|
$ret += (((0x31 - $src) & ($src - 0x38)) >> 8) & ($src - 23);
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Uses bitwise operators instead of table-lookups to turn 5-bit integers
|
|
* into 8-bit integers.
|
|
*
|
|
* Uppercase variant.
|
|
*
|
|
* @param int $src
|
|
* @return int
|
|
*/
|
|
protected static function decode5BitsUpper($src)
|
|
{
|
|
$ret = -1;
|
|
|
|
// if ($src > 64 && $src < 91) $ret += $src - 65 + 1; // -64
|
|
$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
|
|
|
|
// if ($src > 0x31 && $src < 0x38) $ret += $src - 24 + 1; // -23
|
|
$ret += (((0x31 - $src) & ($src - 0x38)) >> 8) & ($src - 23);
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Uses bitwise operators instead of table-lookups to turn 8-bit integers
|
|
* into 5-bit integers.
|
|
*
|
|
* @param $src
|
|
* @return string
|
|
*/
|
|
protected static function encode5Bits($src)
|
|
{
|
|
$diff = 0x61;
|
|
|
|
// if ($src > 25) $ret -= 72;
|
|
$diff -= ((25 - $src) >> 8) & 73;
|
|
|
|
return \pack('C', $src + $diff);
|
|
}
|
|
|
|
/**
|
|
* Uses bitwise operators instead of table-lookups to turn 8-bit integers
|
|
* into 5-bit integers.
|
|
*
|
|
* Uppercase variant.
|
|
*
|
|
* @param $src
|
|
* @return string
|
|
*/
|
|
protected static function encode5BitsUpper($src)
|
|
{
|
|
$diff = 0x41;
|
|
|
|
// if ($src > 25) $ret -= 40;
|
|
$diff -= ((25 - $src) >> 8) & 41;
|
|
|
|
return \pack('C', $src + $diff);
|
|
}
|
|
|
|
|
|
/**
|
|
* Base32 decoding
|
|
*
|
|
* @param $src
|
|
* @param bool $upper
|
|
* @return string
|
|
*/
|
|
protected static function doDecode($src, $upper = false)
|
|
{
|
|
// We do this to reduce code duplication:
|
|
$method = $upper
|
|
? 'decode5BitsUpper'
|
|
: 'decode5Bits';
|
|
|
|
// Remove padding
|
|
$srcLen = Binary::safeStrlen($src);
|
|
if ($srcLen === 0) {
|
|
return '';
|
|
}
|
|
if (($srcLen & 7) === 0) {
|
|
for ($j = 0; $j < 7; ++$j) {
|
|
if ($src[$srcLen - 1] === '=') {
|
|
$srcLen--;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (($srcLen & 7) === 1) {
|
|
throw new \RangeException(
|
|
'Incorrect padding'
|
|
);
|
|
}
|
|
|
|
$err = 0;
|
|
$dest = '';
|
|
// Main loop (no padding):
|
|
for ($i = 0; $i + 8 <= $srcLen; $i += 8) {
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 8));
|
|
$c0 = static::$method($chunk[1]);
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
$c3 = static::$method($chunk[4]);
|
|
$c4 = static::$method($chunk[5]);
|
|
$c5 = static::$method($chunk[6]);
|
|
$c6 = static::$method($chunk[7]);
|
|
$c7 = static::$method($chunk[8]);
|
|
|
|
$dest .= \pack(
|
|
'CCCCC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
|
|
(($c3 << 4) | ($c4 >> 1) ) & 0xff,
|
|
(($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff,
|
|
(($c6 << 5) | ($c7 ) ) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5 | $c6 | $c7) >> 8;
|
|
}
|
|
// The last chunk, which may have padding:
|
|
if ($i < $srcLen) {
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
|
|
$c0 = static::$method($chunk[1]);
|
|
|
|
if ($i + 6 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
$c3 = static::$method($chunk[4]);
|
|
$c4 = static::$method($chunk[5]);
|
|
$c5 = static::$method($chunk[6]);
|
|
$c6 = static::$method($chunk[7]);
|
|
|
|
$dest .= \pack(
|
|
'CCCC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
|
|
(($c3 << 4) | ($c4 >> 1) ) & 0xff,
|
|
(($c4 << 7) | ($c5 << 2) | ($c6 >> 3)) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5 | $c6) >> 8;
|
|
} elseif ($i + 5 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
$c3 = static::$method($chunk[4]);
|
|
$c4 = static::$method($chunk[5]);
|
|
$c5 = static::$method($chunk[6]);
|
|
|
|
$dest .= \pack(
|
|
'CCCC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
|
|
(($c3 << 4) | ($c4 >> 1) ) & 0xff,
|
|
(($c4 << 7) | ($c5 << 2) ) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2 | $c3 | $c4 | $c5) >> 8;
|
|
} elseif ($i + 4 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
$c3 = static::$method($chunk[4]);
|
|
$c4 = static::$method($chunk[5]);
|
|
|
|
$dest .= \pack(
|
|
'CCC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff,
|
|
(($c3 << 4) | ($c4 >> 1) ) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2 | $c3 | $c4) >> 8;
|
|
} elseif ($i + 3 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
$c3 = static::$method($chunk[4]);
|
|
|
|
$dest .= \pack(
|
|
'CC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) | ($c3 >> 4)) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2 | $c3) >> 8;
|
|
} elseif ($i + 2 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
$c2 = static::$method($chunk[3]);
|
|
|
|
$dest .= \pack(
|
|
'CC',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff,
|
|
(($c1 << 6) | ($c2 << 1) ) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1 | $c2) >> 8;
|
|
} elseif ($i + 1 < $srcLen) {
|
|
$c1 = static::$method($chunk[2]);
|
|
|
|
$dest .= \pack(
|
|
'C',
|
|
(($c0 << 3) | ($c1 >> 2) ) & 0xff
|
|
);
|
|
$err |= ($c0 | $c1) >> 8;
|
|
} else {
|
|
$dest .= \pack(
|
|
'C',
|
|
(($c0 << 3) ) & 0xff
|
|
);
|
|
$err |= ($c0) >> 8;
|
|
}
|
|
}
|
|
if ($err !== 0) {
|
|
throw new \RangeException(
|
|
'Base32::doDecode() only expects characters in the correct base32 alphabet'
|
|
);
|
|
}
|
|
return $dest;
|
|
}
|
|
|
|
/**
|
|
* Base32 Decoding
|
|
*
|
|
* @param string $src
|
|
* @param bool $upper
|
|
* @return string
|
|
*/
|
|
protected static function doEncode($src, $upper = false)
|
|
{
|
|
// We do this to reduce code duplication:
|
|
$method = $upper
|
|
? 'encode5BitsUpper'
|
|
: 'encode5Bits';
|
|
|
|
$dest = '';
|
|
$srcLen = Binary::safeStrlen($src);
|
|
|
|
// Main loop (no padding):
|
|
for ($i = 0; $i + 5 <= $srcLen; $i += 5) {
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, 5));
|
|
$b0 = $chunk[1];
|
|
$b1 = $chunk[2];
|
|
$b2 = $chunk[3];
|
|
$b3 = $chunk[4];
|
|
$b4 = $chunk[5];
|
|
$dest .=
|
|
static::$method( ($b0 >> 3) & 31) .
|
|
static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
|
|
static::$method((($b1 >> 1) ) & 31) .
|
|
static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
|
|
static::$method((($b2 << 1) | ($b3 >> 7)) & 31) .
|
|
static::$method((($b3 >> 2) ) & 31) .
|
|
static::$method((($b3 << 3) | ($b4 >> 5)) & 31) .
|
|
static::$method( $b4 & 31);
|
|
}
|
|
// The last chunk, which may have padding:
|
|
if ($i < $srcLen) {
|
|
$chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
|
|
$b0 = $chunk[1];
|
|
if ($i + 3 < $srcLen) {
|
|
$b1 = $chunk[2];
|
|
$b2 = $chunk[3];
|
|
$b3 = $chunk[4];
|
|
$dest .=
|
|
static::$method( ($b0 >> 3) & 31) .
|
|
static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
|
|
static::$method((($b1 >> 1) ) & 31) .
|
|
static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
|
|
static::$method((($b2 << 1) | ($b3 >> 7)) & 31) .
|
|
static::$method((($b3 >> 2) ) & 31) .
|
|
static::$method((($b3 << 3) ) & 31) .
|
|
'=';
|
|
} elseif ($i + 2 < $srcLen) {
|
|
$b1 = $chunk[2];
|
|
$b2 = $chunk[3];
|
|
$dest .=
|
|
static::$method( ($b0 >> 3) & 31) .
|
|
static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
|
|
static::$method((($b1 >> 1) ) & 31) .
|
|
static::$method((($b1 << 4) | ($b2 >> 4)) & 31) .
|
|
static::$method((($b2 << 1) ) & 31) .
|
|
'===';
|
|
} elseif ($i + 1 < $srcLen) {
|
|
$b1 = $chunk[2];
|
|
$dest .=
|
|
static::$method( ($b0 >> 3) & 31) .
|
|
static::$method((($b0 << 2) | ($b1 >> 6)) & 31) .
|
|
static::$method((($b1 >> 1) ) & 31) .
|
|
static::$method((($b1 << 4) ) & 31) .
|
|
'====';
|
|
} else {
|
|
$dest .=
|
|
static::$method( ($b0 >> 3) & 31) .
|
|
static::$method( ($b0 << 2) & 31) .
|
|
'======';
|
|
}
|
|
}
|
|
return $dest;
|
|
}
|
|
} |