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【PHP】 aes算法

作者:步山 / 发布于2014/11/10/ 303


	function aes128cbcEncrypt($key, $text)
	{
	 /**
	 * Open the cipher
	 */
	 $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
	 if (! $td)
	 {
	 throw new GeneralSecurityException('Invalid mcrypt cipher, check your libmcrypt library and php-mcrypt extention');
	 }
	 // replaced MCRYPT_DEV_RANDOM with MCRYPT_RAND since windows doesn't have /dev/rand :)
	 srand((double)microtime() * 1000000);
	 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
	 /**
	 * Intialize encryption
	 */
	 mcrypt_generic_init($td, $key, $iv);
	 /**
	 * Encrypt data
	 */
	 $encrypted = mcrypt_generic($td, $text);
	 /**
	 * Terminate encryption handler
	 */
	 mcrypt_generic_deinit($td);
	 /**
	 * AES-128-CBC encryption. The IV is returned as the first 16 bytes
	 * of the cipher text.
	 */
	 return $iv . $encrypted;
	}

	function aes128cbcDecrypt($key, $encrypted_text)
	{
	 /**
	 * Open the cipher
	 */
	 $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
	 if (is_callable('mb_substr'))
	 {
	 $iv = mb_substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE, 'latin1');
	 }
	 else
	 {
	 $iv = substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE);
	 }
	 /**
	 * Initialize encryption module for decryption
	 */
	 mcrypt_generic_init($td, $key, $iv);
	 /**
	 * Decrypt encrypted string
	 */
	 if (is_callable('mb_substr'))
	 {
	 $encrypted = mb_substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE, mb_strlen($encrypted_text, 'latin1'), 'latin1');
	 }
	 else
	 {
	 $encrypted = substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE);
	 }
	 $decrypted = mdecrypt_generic($td, $encrypted);
	 /**
	 * Terminate decryption handle and close module
	 */
	 mcrypt_generic_deinit($td);
	 mcrypt_module_close($td);
	 /**
	 * Show string
	 */
	 return trim($decrypted);
	}
	define('Crypto_CIPHER_BLOCK_SIZE', 16);
	$a = aes128cbcEncrypt('pass', 'this is text');
	echo base64_encode($a) . "/r/n";
	$b = aes128cbcDecrypt('pass', $a);
	echo $b . "/r/n";
	$c = aes128cbcDecrypt('pass', base64_decode(base64_encode($a)));
	echo $c . "/r/n";
	?>

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