/**
* Setup the performance-optimized function for de/encrypt()
*
* @see NostoCryptBase::setupInlineCrypt()
*/
public function setupInlineCrypt()
{
// Note: _setupInlineCrypt() will be called only if $this->changed === true
// So here we are not under the same heavy timing-stress as we are in _de/encryptBlock() or de/encrypt().
// However...the here generated function- $code, stored as php callback in $this->inlineCrypt, must work as fast
// as even possible.
$lambda_functions =& NostoCryptRijndael::getLambdaFunctions();
$w = array();
$dw = array();
// The first 10 generated $lambda_functions will use the key-words hardcoded for better performance.
// For memory reason we limit those ultra-optimized functions.
// After that, we use pure (extracted) integer vars for the key-words which is faster than accessing them via
// array.
if (count($lambda_functions) < 10) {
$w = $this->w;
$dw = $this->dw;
$init_encrypt = '';
$init_decrypt = '';
} else {
for ($i = 0, $cw = count($this->w); $i < $cw; ++$i) {
$w[] = '$w[' . $i . ']';
$dw[] = '$dw[' . $i . ']';
}
$init_encrypt = '$w = $self->w;';
$init_decrypt = '$dw = $self->dw;';
}
$code_hash = md5(str_pad("NostoCryptRijndael, {$this->mode}, {$this->blockSize}, ", 32, "") . implode(',', $w));
if (!isset($lambda_functions[$code_hash])) {
$nr = $this->nr;
$nb = $this->nb;
$c = $this->c;
// Generating encrypt code:
$init_encrypt .= '
static $t0, $t1, $t2, $t3, $sbox;
if (!$t0) {
for ($i = 0; $i < 256; ++$i) {
$t0[$i] = (int)$self->t0[$i];
$t1[$i] = (int)$self->t1[$i];
$t2[$i] = (int)$self->t2[$i];
$t3[$i] = (int)$self->t3[$i];
$sbox[$i] = (int)$self->sbox[$i];
}
}
';
$s = 'e';
$e = 's';
$wc = $nb - 1;
// Pre-round: addRoundKey
$encrypt_block = '$in = unpack("N*", $in);' . "\n";
for ($i = 0; $i < $nb; ++$i) {
$encrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $w[++$wc] . ";\n";
}
// Main-rounds: shiftRows + subWord + mixColumns + addRoundKey
for ($round = 1; $round < $nr; ++$round) {
list($s, $e) = array($e, $s);
for ($i = 0; $i < $nb; ++$i) {
$encrypt_block .= '$' . $e . $i . ' =
$t0[($' . $s . $i . ' >> 24) & 0xff] ^
$t1[($' . $s . ($i + $c[1]) % $nb . ' >> 16) & 0xff] ^
$t2[($' . $s . ($i + $c[2]) % $nb . ' >> 8) & 0xff] ^
$t3[ $' . $s . ($i + $c[3]) % $nb . ' & 0xff] ^
' . $w[++$wc] . ";\n";
}
}
// Final-round: subWord + shiftRows + addRoundKey
for ($i = 0; $i < $nb; ++$i) {
$encrypt_block .= '$' . $e . $i . ' =
$sbox[ $' . $e . $i . ' & 0xff] |
($sbox[($' . $e . $i . ' >> 8) & 0xff] << 8) |
($sbox[($' . $e . $i . ' >> 16) & 0xff] << 16) |
($sbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n";
}
$encrypt_block .= '$in = pack("N*"' . "\n";
for ($i = 0; $i < $nb; ++$i) {
$encrypt_block .= ',
($' . $e . $i . ' & 0xFF000000) ^
($' . $e . ($i + $c[1]) % $nb . ' & 0x00FF0000) ^
($' . $e . ($i + $c[2]) % $nb . ' & 0x0000FF00) ^
($' . $e . ($i + $c[3]) % $nb . ' & 0x000000FF) ^
' . $w[$i] . "\n";
}
$encrypt_block .= ');';
// Generating decrypt code:
$init_decrypt .= '
static $dt0, $dt1, $dt2, $dt3, $isbox;
if (!$dt0) {
for ($i = 0; $i < 256; ++$i) {
$dt0[$i] = (int)$self->dt0[$i];
$dt1[$i] = (int)$self->dt1[$i];
$dt2[$i] = (int)$self->dt2[$i];
$dt3[$i] = (int)$self->dt3[$i];
$isbox[$i] = (int)$self->isbox[$i];
}
}
';
$s = 'e';
$e = 's';
$wc = $nb - 1;
// Pre-round: addRoundKey
$decrypt_block = '$in = unpack("N*", $in);' . "\n";
for ($i = 0; $i < $nb; ++$i) {
$decrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $dw[++$wc] . ';' . "\n";
}
// Main-rounds: shiftRows + subWord + mixColumns + addRoundKey
for ($round = 1; $round < $nr; ++$round) {
list($s, $e) = array($e, $s);
for ($i = 0; $i < $nb; ++$i) {
$decrypt_block .= '$' . $e . $i . ' =
$dt0[($' . $s . $i . ' >> 24) & 0xff] ^
$dt1[($' . $s . ($nb + $i - $c[1]) % $nb . ' >> 16) & 0xff] ^
$dt2[($' . $s . ($nb + $i - $c[2]) % $nb . ' >> 8) & 0xff] ^
$dt3[ $' . $s . ($nb + $i - $c[3]) % $nb . ' & 0xff] ^
' . $dw[++$wc] . ";\n";
}
}
// Finalround: subWord + shiftRows + addRoundKey
for ($i = 0; $i < $nb; ++$i) {
$decrypt_block .= '$' . $e . $i . ' =
$isbox[ $' . $e . $i . ' & 0xff] |
($isbox[($' . $e . $i . ' >> 8) & 0xff] << 8) |
($isbox[($' . $e . $i . ' >> 16) & 0xff] << 16) |
($isbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n";
}
$decrypt_block .= '$in = pack("N*"' . "\n";
for ($i = 0; $i < $nb; ++$i) {
$decrypt_block .= ',
($' . $e . $i . ' & 0xFF000000) ^
($' . $e . ($nb + $i - $c[1]) % $nb . ' & 0x00FF0000) ^
($' . $e . ($nb + $i - $c[2]) % $nb . ' & 0x0000FF00) ^
($' . $e . ($nb + $i - $c[3]) % $nb . ' & 0x000000FF) ^
' . $dw[$i] . "\n";
}
$decrypt_block .= ');';
$lambda_functions[$code_hash] = $this->createInlineCryptFunction(array('init_crypt' => '', 'init_encrypt' => $init_encrypt, 'init_decrypt' => $init_decrypt, 'encrypt_block' => $encrypt_block, 'decrypt_block' => $decrypt_block));
}
$this->inlineCrypt = $lambda_functions[$code_hash];
}
/**
* Default Constructor.
*
* Determines whether or not the mcrypt extension should be used.
*
* $mode could be:
*
* - CRYPT_AES_MODE_ECB
*
* - CRYPT_AES_MODE_CBC
*
* - CRYPT_AES_MODE_CTR
*
* - CRYPT_AES_MODE_CFB
*
* - CRYPT_AES_MODE_OFB
*
* If not explicitly set, CRYPT_AES_MODE_CBC will be used.
*
* @see NostoCryptRijndael::__construct()
* @see NostoCryptBase::__construct()
* @param optional Integer $mode
*/
public function __construct($mode = CRYPT_AES_MODE_CBC)
{
parent::__construct($mode);
}
