99 lines
3.3 KiB
PHP
99 lines
3.3 KiB
PHP
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<?php
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class AES{
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/**
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* This was AES-128 / CBC / PKCS5Padding
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* return base64_encode string
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* @author Terry
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* @param string $plaintext
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* @param string $key
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* @return string
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*/
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public static function AesEncrypt($plaintext,$key = null)
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{
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$plaintext = trim($plaintext);
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if ($plaintext == '') return '';
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$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
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//PKCS5Padding
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$padding = $size - strlen($plaintext) % $size;
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// 添加Padding
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$plaintext .= str_repeat(chr($padding), $padding);
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$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
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$key=self::substr($key, 0, mcrypt_enc_get_key_size($module));
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$iv = str_repeat("\0", $size); //java里面的16个空数组对应的是\0.
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/* Intialize encryption */
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mcrypt_generic_init($module, $key, $iv);
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/* Encrypt data */
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$encrypted = mcrypt_generic($module, $plaintext);
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/* Terminate encryption handler */
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mcrypt_generic_deinit($module);
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mcrypt_module_close($module);
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return base64_encode($encrypted);
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}
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/**
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* Returns the length of the given string.
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* If available uses the multibyte string function mb_strlen.
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* @param string $string the string being measured for length
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* @return integer the length of the string
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*/
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private static function strlen($string)
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{
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return extension_loaded('mbstring') ? mb_strlen($string,'8bit') : strlen($string);
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}
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/**
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* Returns the portion of string specified by the start and length parameters.
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* If available uses the multibyte string function mb_substr
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* @param string $string the input string. Must be one character or longer.
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* @param integer $start the starting position
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* @param integer $length the desired portion length
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* @return string the extracted part of string, or FALSE on failure or an empty string.
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*/
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private static function substr($string,$start,$length)
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{
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return extension_loaded('mbstring') ? mb_substr($string,$start,$length,'8bit') : substr($string,$start,$length);
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}
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/**
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* This was AES-128 / CBC / PKCS5Padding
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* @author Terry
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* @param string $encrypted base64_encode encrypted string
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* @param string $key
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* @throws CException
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* @return string
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*/
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public static function AesDecrypt($encrypted, $key = null)
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{
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if ($encrypted == '') return '';
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$ciphertext_dec = base64_decode($encrypted);
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$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
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$key=self::substr($key, 0, mcrypt_enc_get_key_size($module));
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$iv = str_repeat("\0", 16); //解密的初始化向量要和加密时一样。
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/* Initialize encryption module for decryption */
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mcrypt_generic_init($module, $key, $iv);
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/* Decrypt encrypted string */
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$decrypted = mdecrypt_generic($module, $ciphertext_dec);
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/* Terminate decryption handle and close module */
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mcrypt_generic_deinit($module);
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mcrypt_module_close($module);
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$a = rtrim($decrypted,"\0");
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return rtrim($decrypted,"\0");
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}
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}
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//echo AES::AesEncrypt("haha","mkeymkeymkeymkey");
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?>
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