<?php
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/**
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* PhalApi_Crypt_Mcrypt 原始mcrypt加密
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*
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* 使用mcrypt扩展进加解密
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*
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* <br>使用示例：<br>
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```
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* $mcrypt = new PhalApi_Crypt_Mcrypt('12345678');
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*
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* $data = 'dogstar love php';
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* $key = 'secrect';
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*
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* // 加密
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* $encryptData = $mcrypt->encrypt($data, $key);
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*
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* // 解密
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* $decryptData = $mcrypt->decrypt($encryptData, $key);
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```
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*
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* @package PhalApi\Crypt
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* @link http://php.net/manual/zh/function.mcrypt-generic.php
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* @license http://www.phalapi.net/license GPL 协议
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* @link http://www.phalapi.net/
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* @author dogstar <chanzonghuang@gmail.com> 2014-12-10
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*/
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class PhalApi_Crypt_Mcrypt implements PhalApi_Crypt {
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/**
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* @var string $iv 加密向量， 最大长度不得超过PhalApi_Crypt_Mcrypt::MAX_IV_SIZE
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*/
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protected $iv;
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/**
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* @var int 最大加密向量长度
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*/
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const MAX_IV_SIZE = 8;
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/**
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* @var int 最大加密key的长度
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*/
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const MAX_KEY_LENGTH = 56;
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/**
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* @param string $iv 加密的向量 最大长度不得超过 MAX_IV_SIZE
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*/
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public function __construct($iv = '********') {
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$this->iv = str_pad($iv, static::MAX_IV_SIZE, '*');
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if (strlen($this->iv) > static::MAX_IV_SIZE) {
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$this->iv = substr($this->iv, 0, static::MAX_IV_SIZE);
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}
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}
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/**
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* 对称加密
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*
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* @param string $data 待加密的数据
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* @param string key 私钥
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* @return string 加密后的数据
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*/
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public function encrypt($data, $key) {
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if ($data === '') {
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return $data;
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}
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$cipher = $this->createCipher($key);
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$encrypted = mcrypt_generic($cipher, $data);
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$this->clearCipher($cipher);
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return $encrypted;
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}
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/**
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* 对称解密
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*
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* @see PhalApi_Crypt_Mcrypt::encrypt()
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*
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* @param string $data 待解密的数据
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* @param string key 私钥
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* @return string 解密后的数据
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*/
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public function decrypt($data, $key) {
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if ($data === '') {
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return $data;
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}
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$cipher = $this->createCipher($key);
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$decrypted = mdecrypt_generic($cipher, $data);
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$this->clearCipher($cipher);
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return rtrim($decrypted, "\0");
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}
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/**
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* 创建cipher
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* @param string $key 私钥
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* @return resource
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* @throws PhalApi_Exception_InternalServerError
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*/
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protected function createCipher($key) {
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$cipher = mcrypt_module_open(MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '');
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if ($cipher === FALSE || $cipher < 0) {
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throw new PhalApi_Exception_InternalServerError(
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T('mcrypt_module_open with {cipher}', array('cipher' => $cipher))
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);
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}
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mcrypt_generic_init($cipher, $this->formatKey($key), $this->iv);
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return $cipher;
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}
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/**
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* 格式化私钥
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* @param string $key 私钥
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*/
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protected function formatKey($key) {
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return strlen($key) > static::MAX_KEY_LENGTH ? substr($key, 0, static::MAX_KEY_LENGTH) : $key;
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}
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/**
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* 释放cipher
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* @param resource $cipher
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*/
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protected function clearCipher($cipher) {
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mcrypt_generic_deinit($cipher);
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mcrypt_module_close($cipher);
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}
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}
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