php写的AES加密解密类分享
发布:smiling 来源: PHP粉丝网 添加日期:2021-02-28 16:05:20 浏览: 评论:0
这篇文章主要介绍了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,需要的朋友可以参考下,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:
- <?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);
- }
- }
Tags: AES加密解密
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