php AES加密解密类实例代码

php写的AES加密解密类,实际是为YII框架写的,不在YII框架时只需替换其中的两句代码即可使用。
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。

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类代码:

<?php
/**
 * php AES加解密类
 * 如果要与java共用，则密钥长度应该为16位长度
 * 因为java只支持128位加密，所以php也用128位加密，可以与java互转。
 * 同时AES的标准也是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标准来加解密
 *
 * @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);
}
}