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