static function unpack_octets($packed)
{
$j = 0;
$i = 0;
$l = count($packed);
$r = array_fill(0, $l * 4, 0);
for ($j = 0; $j < $l; $j++) {
$r[$i++] = GPG_Utility::B0($packed[$j]);
$r[$i++] = GPG_Utility::B1($packed[$j]);
$r[$i++] = GPG_Utility::B2($packed[$j]);
$r[$i++] = GPG_Utility::B3($packed[$j]);
}
return $r;
}
function Expanded_Key($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;
}