/**
* Sets the secret key.
*
* The key must be non-zero, and less than or equal to MAXKEYSIZE
* characters (bytes) in length.
*
* @param string $key Key must be non-empty and less than MAXKEYSIZE
* bytes in length.
* @param string $iv The initialization vector to use. Only needed for
* 'cbc' cipher. If null, an IV is automatically
* generated.
*
* @throws Horde_Crypt_Blowfish_Exception
*/
public function setKey($key, $iv = null)
{
if (!is_string($key)) {
throw new Horde_Crypt_Blowfish_Exception('Encryption key must be a string.');
}
$len = strlen($key);
if ($len > self::MAXKEYSIZE || $len == 0) {
throw new Horde_Crypt_Blowfish_Exception(sprintf('Encryption key must be less than %d characters (bytes) and non-zero. Supplied key length: %d', self::MAXKEYSIZE, $len));
}
$this->_crypt->key = $key;
switch ($this->_crypt->cipher) {
case 'cbc':
if (is_null($iv)) {
if (is_null($this->iv)) {
$this->_crypt->setIv();
}
} else {
$iv = substr($iv, 0, self::IV_LENGTH);
if (($len = strlen($iv)) < self::IV_LENGTH) {
$iv .= str_repeat(chr(0), self::IV_LENGTH - $len);
}
$this->_crypt->setIv($iv);
}
break;
case 'ecb':
$this->iv = false;
break;
}
}
/**
*/
public function __construct($cipher)
{
parent::__construct($cipher);
$this->_mcrypt = mcrypt_module_open(MCRYPT_BLOWFISH, '', $cipher, '');
}
