105 lines
2.9 KiB
PHP
105 lines
2.9 KiB
PHP
|
<?php
|
||
|
|
/** @package php-gpg::GPG */
|
||
|
|
|
||
|
|
/** require supporting files */
|
||
|
|
require_once("Cipher.php");
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @package php-gpg::GPG
|
||
|
|
*/
|
||
|
|
class Expanded_Key {
|
||
|
|
var $rounds;
|
||
|
|
var $rk;
|
||
|
|
|
||
|
|
function Expanded_Key($key) {
|
||
|
|
$RCON = GPG_Cipher::$RCON;
|
||
|
|
$S = GPG_Cipher::$S;
|
||
|
|
|
||
|
|
$maxkc = GPG_Cipher::$maxkc;
|
||
|
|
$maxrk = GPG_Cipher::$maxrk;
|
||
|
|
|
||
|
|
$kc = 0;
|
||
|
|
$i = 0;
|
||
|
|
$j = 0;
|
||
|
|
$r = 0;
|
||
|
|
$t = 0;
|
||
|
|
$rounds = 0;
|
||
|
|
$keySched = array_fill(0, $maxrk + 1, 0);
|
||
|
|
$keylen = strlen($key);
|
||
|
|
$k = array_fill(0, $maxkc, 0);
|
||
|
|
$tk = array_fill(0, $maxkc, 0);
|
||
|
|
$rconpointer = 0;
|
||
|
|
|
||
|
|
if ($keylen == 16) {
|
||
|
|
$rounds = 10;
|
||
|
|
$kc = 4;
|
||
|
|
} else if ($keylen == 24) {
|
||
|
|
$rounds = 12;
|
||
|
|
$kc = 6;
|
||
|
|
} else if ($keylen == 32) {
|
||
|
|
$rounds = 14;
|
||
|
|
$kc = 8;
|
||
|
|
} else {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
for($i = 0; $i < $maxrk + 1; $i++) $keySched[$i] = array_fill(0, 4, 0);
|
||
|
|
for($i = 0, $j = 0; $j < $keylen; $j++, $i += 4) {
|
||
|
|
if ($i < $keylen) {
|
||
|
|
$k[$j] = ord($key[$i]) | (ord($key[$i + 1]) << 0x8) |
|
||
|
|
(ord($key[$i + 2]) << 0x10) | (ord($key[$i + 3]) << 0x18);
|
||
|
|
} else {
|
||
|
|
$k[$j] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for($j = $kc - 1; $j >= 0; $j--) $tk[$j] = $k[$j];
|
||
|
|
|
||
|
|
$r = 0;
|
||
|
|
$t = 0;
|
||
|
|
for($j = 0; ($j < $kc) && ($r < $rounds + 1); ) {
|
||
|
|
for(; ($j < $kc) && ($t < 4); $j++, $t++) {
|
||
|
|
$keySched[$r][$t] = $tk[$j];
|
||
|
|
}
|
||
|
|
if($t == 4) {
|
||
|
|
$r++;
|
||
|
|
$t = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
while($r < $rounds + 1) {
|
||
|
|
$temp = $tk[$kc - 1];
|
||
|
|
|
||
|
|
$tk[0] ^= $S[GPG_Utility::B1($temp)] | ($S[GPG_Utility::B2($temp)] << 0x8) |
|
||
|
|
($S[GPG_Utility::B3($temp)] << 0x10) | ($S[GPG_Utility::B0($temp)] << 0x18);
|
||
|
|
$tk[0] ^= $RCON[$rconpointer++];
|
||
|
|
|
||
|
|
if ($kc != 8) {
|
||
|
|
for($j = 1; $j < $kc; $j++) $tk[$j] ^= $tk[$j - 1];
|
||
|
|
} else {
|
||
|
|
for($j = 1; $j < $kc / 2; $j++) $tk[$j] ^= $tk[$j - 1];
|
||
|
|
|
||
|
|
$temp = $tk[$kc / 2 - 1];
|
||
|
|
$tk[$kc / 2] ^= $S[GPG_Utility::B0($temp)] | ($S[GPG_Utility::B1($temp)] << 0x8) |
|
||
|
|
($S[GPG_Utility::B2($temp)] << 0x10) | ($S[GPG_Utility::B3($temp)] << 0x18);
|
||
|
|
|
||
|
|
for($j = $kc / 2 + 1; $j < $kc; $j++) $tk[$j] ^= $tk[$j - 1];
|
||
|
|
}
|
||
|
|
|
||
|
|
for($j = 0; ($j < $kc) && ($r < $rounds + 1); ) {
|
||
|
|
for(; ($j < $kc) && ($t < 4); $j++, $t++) {
|
||
|
|
$keySched[$r][$t] = $tk[$j];
|
||
|
|
}
|
||
|
|
if($t == 4) {
|
||
|
|
$r++;
|
||
|
|
$t = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->rounds = $rounds;
|
||
|
|
$this->rk = $keySched;
|
||
|
|
return $this;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
?>
|