php写的AES加密解密类分享

今天写了一个php的AES加密类。适用于Yii的扩展。
如果不用在Yii框架中，把代码中Yii::app()->params['encryptKey'] 换成你对应的默认key就可以了。
类代码:

params['encryptKey'] : $key, 0, mcrypt_enc_get_key_size($module));
		/* Create the IV and determine the keysize length, use MCRYPT_RAND
		 * on Windows instead */
		$iv = substr(md5($key),0,mcrypt_enc_get_iv_size($module));
		/* Intialize encryption */
		mcrypt_generic_init($module, $key, $iv);

		/* Encrypt data */
		$encrypted = mcrypt_generic($module, $plaintext);

		/* Terminate encryption handler */
		mcrypt_generic_deinit($module);
		mcrypt_module_close($module);
		return base64_encode($encrypted);
	}

	/**
	 * This was AES-128 / CBC / NoPadding decrypted.
	 * @author Terry
	 * @param string $encrypted		base64_encode encrypted string
	 * @param string $key
	 * @throws CException
	 * @return string
	 */
	public static function AesDecrypt($encrypted, $key = null)
	{
		if ($encrypted == '') return '';
		if(!extension_loaded('mcrypt'))
			throw new CException(Yii::t('yii','AesDecrypt requires PHP mcrypt extension to be loaded in order to use data encryption feature.'));

		$ciphertext_dec = base64_decode($encrypted);
		$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
		$key=self::substr($key===null ? Yii::app()->params['encryptKey'] : $key, 0, mcrypt_enc_get_key_size($module));

		$iv = substr(md5($key),0,mcrypt_enc_get_iv_size($module));

		/* Initialize encryption module for decryption */
		mcrypt_generic_init($module, $key, $iv);

		/* Decrypt encrypted string */
		$decrypted = mdecrypt_generic($module, $ciphertext_dec);

		/* Terminate decryption handle and close module */
		mcrypt_generic_deinit($module);
		mcrypt_module_close($module);
		return rtrim($decrypted,"\0");
	}

	/**
	 * Returns the length of the given string.
	 * If available uses the multibyte string function mb_strlen.
	 * @param string $string the string being measured for length
	 * @return integer the length of the string
	 */
	private static function strlen($string)
	{
		return extension_loaded('mbstring') ? mb_strlen($string,'8bit') : strlen($string);
	}

	/**
	 * Returns the portion of string specified by the start and length parameters.
	 * If available uses the multibyte string function mb_substr
	 * @param string $string the input string. Must be one character or longer.
	 * @param integer $start the starting position
	 * @param integer $length the desired portion length
	 * @return string the extracted part of string, or FALSE on failure or an empty string.
	 */
	private static function substr($string,$start,$length)
	{
		return extension_loaded('mbstring') ? mb_substr($string,$start,$length,'8bit') : substr($string,$start,$length);
	}
}