Php Aes加密类程序代码分享
今天没事与了一个Php Aes加密类程序,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.
AES加密算法 – 算法原理
AES 算法基于排列和置换运算,排列是对数据重新进行安排,置换是将一个数据单元替换为另一个,AES 使用几种不同的方法来执行排列和置换运算.
AES 是一个迭代的、对称密钥分组的密码,它可以使用128、192 和 256 位密钥,并且用 128 位（16字节）分组加密和解密数据,与公共密钥密码使用密钥对不同,对称密钥密码使用相同的密钥加密和解密数据,通过分组密码返回的加密数据的位数与输入数据相同,迭代加密使用一个循环结构,在该循环中重复置换和替换输入数据,代码如下:
<?php /** * php AES加解密类 * 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。 * * @author Terry * */ class PhpAes { /** * This was AES-128 / CBC / ZeroBytePadding encrypted. * return base64_encode string * @author Terry * @param string $plaintext * @param string $key */ public static function AesEncrypt( $plaintext , $key = null) { 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); $plaintext = self::PKCS5Padding( $plaintext , $size ); $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 (trim( $encrypted )); } /** * This was AES-128 / CBC / ZeroBytePadding 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 self::UnPKCS5Padding( $decrypted ); } private static function strlen ( $string ) { return extension_loaded ( 'mbstring' ) ? mb_strlen( $string , '8bit' ) : strlen ( $string ); } private static function substr ( $string , $start , $length ) { return extension_loaded ( 'mbstring' ) ? mb_substr( $string , $start , $length , '8bit' ) : substr ( $string , $start , $length ); } private static function PKCS5Padding ( $text , $blocksize ) { $pad = $blocksize - (self:: strlen ( $text ) % $blocksize ); return $text . str_repeat ( chr ( $pad ), $pad ); } private static function UnPKCS5Padding( $text ) { $pad = ord( $text {self:: strlen ( $text )-1}); if ( $pad > self:: strlen ( $text )) return false; if ( strspn ( $text , chr ( $pad ), self:: strlen ( $text ) - $pad ) != $pad ) return false; return substr ( $text , 0, -1 * $pad ); } } ?>使用方法,代码如下:
<?php require_once ( './AES.php' ); //$aes = new AES(); $aes = new AES(true); // 把加密后的字符串按十六进制进行存储 //$aes = new AES(true,true);// 带有调试信息且加密字符串按十六进制存储 $key = "this is a 32 byte key" ; // 密钥 $keys = $aes ->makeKey( $key ); $encode = "123456" ; // 被加密的字符串 $ct = $aes ->encryptString( $encode , $keys ); echo "encode = " . $ct . "<br>" ; //开源代码phpfensi测试数据 $cpt = $aes ->decryptString( $ct , $keys ); echo "decode = " . $cpt ; ?>查看更多关于Php Aes加密类程序代码分享 - php类库的详细内容...
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