<?php
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include_once "errorCode.php";
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/**
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* PKCS7Encoder class
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*
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* 提供基于PKCS7算法的加解密接口.
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*/
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class PKCS7Encoder
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{
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public static $block_size = 16;
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/**
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* 对需要加密的明文进行填充补位
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* @param $text 需要进行填充补位操作的明文
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* @return 补齐明文字符串
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*/
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function encode( $text )
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{
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$block_size = PKCS7Encoder::$block_size;
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$text_length = strlen( $text );
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//计算需要填充的位数
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$amount_to_pad = PKCS7Encoder::$block_size - ( $text_length % PKCS7Encoder::$block_size );
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if ( $amount_to_pad == 0 ) {
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$amount_to_pad = PKCS7Encoder::block_size;
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}
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//获得补位所用的字符
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$pad_chr = chr( $amount_to_pad );
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$tmp = "";
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for ( $index = 0; $index < $amount_to_pad; $index++ ) {
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$tmp .= $pad_chr;
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}
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return $text . $tmp;
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}
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/**
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* 对解密后的明文进行补位删除
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* @param decrypted 解密后的明文
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* @return 删除填充补位后的明文
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*/
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function decode($text)
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{
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$pad = ord(substr($text, -1));
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if ($pad < 1 || $pad > 32) {
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$pad = 0;
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}
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return substr($text, 0, (strlen($text) - $pad));
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}
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}
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/**
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* Prpcrypt class
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*
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*
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*/
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class Prpcrypt
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{
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public $key;
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function Prpcrypt( $k )
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{
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$this->key = $k;
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}
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/**
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* 对密文进行解密
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* @param string $aesCipher 需要解密的密文
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* @param string $aesIV 解密的初始向量
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* @return string 解密得到的明文
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*/
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public function decrypt( $aesCipher, $aesIV )
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{
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try {
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$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
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mcrypt_generic_init($module, $this->key, $aesIV);
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//解密
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$decrypted = mdecrypt_generic($module, $aesCipher);
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mcrypt_generic_deinit($module);
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mcrypt_module_close($module);
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} catch (Exception $e) {
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return array(ErrorCode::$IllegalBuffer, null);
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}
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try {
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//去除补位字符
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$pkc_encoder = new PKCS7Encoder;
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$result = $pkc_encoder->decode($decrypted);
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} catch (Exception $e) {
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//print $e;
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return array(ErrorCode::$IllegalBuffer, null);
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}
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return array(0, $result);
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}
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}
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?>
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