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<?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 $encryptedbase64_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,""）;}/** * 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）;}}