今天寫了一個php的AES加密類。適用于Yii的擴(kuò)展。
如果不用在Yii框架中，把代碼中Yii::app()->params['encryptKey'] 換成你對應(yīng)的默認(rèn)key就可以了。
類代碼:

<?php/** * php AES加解密類 * 如果要與Java共用，則密鑰長度應(yīng)該為16位長度 * 因?yàn)?a href=/itjie/Javajishu/ target=_blank class=infotextkey>Java只支持128位加密，所以php也用128位加密，可以與Java互轉(zhuǎn)。 * 同時AES的標(biāo)準(zhǔn)也是128位。只是RIJNDAEL算法可以支持128，192和256位加密。 * Java 要使用AES/CBC/NoPadding標(biāo)準(zhǔn)來加解密 *  * @author Terry * */class phpAes{	/**	 * This was AES-128 / CBC / NoPadding encrypted.	 * return base64_encode string	 * @author Terry	 * @param string $plaintext	 * @param string $key	 */	public static function AesEncrypt($plaintext,$key = null)	{		$plaintext = trim($plaintext);		if ($plaintext == '') return '';		if(!extension_loaded('mcrypt'))			throw new CException(Yii::t('yii','AesEncrypt requires php mcrypt extension to be loaded in order to use data encryption feature.'));		$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);		$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));		/* 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);	}}

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