PHP和C#可共用的可逆加密算法详解

在一些项目中要求在php中生成加密，然后在asp.net中接受过来的密码再解密，下面和大家分享一个PHP与asp.net C#可共用的可逆加密算法，感兴趣的可以参考参考。

php加密算法：

<?php
class DES
{
 var $key;
 var $iv; //偏移量
 
 function DES($key = '11001100', $iv=0 ) {
 //key长度8例如:1234abcd
 $this->key = $key;
 if( $iv == 0 ) {
 $this->iv = $key; //默认以$key 作为 iv
 } else {
 $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );
 }
 }
 
 function encrypt($str) {
 //加密，返回大写十六进制字符串
 $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
 $str = $this->pkcs5Pad ( $str, $size );
 return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );
 }
 
 function decrypt($str) {
 //解密
 $strBin = $this->hex2bin( strtolower( $str ) );
 $str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );
 $str = $this->pkcs5Unpad( $str );
 return $str;
 }
 
 function hex2bin($hexData) {
 $binData = "";
 for($i = 0; $i < strlen ( $hexData ); $i += 2) {
 $binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );
 }
 return $binData;
 }

 function pkcs5Pad($text, $blocksize) {
 $pad = $blocksize - (strlen ( $text ) % $blocksize);
 return $text . str_repeat ( chr ( $pad ), $pad );
 }
 
 function pkcs5Unpad($text) {
 $pad = ord ( $text {strlen ( $text ) - 1} );
 if ($pad > strlen ( $text ))
 return false;
 if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
 return false;
 return substr ( $text, 0, - 1 * $pad );
 }
 
}
?>

asp.net程序代码：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace WindowsFormsApplication1
{
 /// <summary>
 /// DES加密解密字符串
 /// </summary>
 public class DesEncryption
 {
 /// <summary>
 /// DES加密字符串
 /// </summary>
 /// <param name="encryptString">待加密的字符串</param>
 /// <param name="encryptKey">加密密钥,要求为8位</param>
 /// <returns>加密成功返回加密后的字符串，失败返回null</returns>
 public static string EncryptDES(string encryptString, string encryptKey = "11001100")
 {
 try
 {
 byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(encryptKey.Substring(0, 8));
 byte[] rgbIV = rgbKey;
 byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
 DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
 MemoryStream mStream = new MemoryStream();
 CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, 0, inputByteArray.Length);
 cStream.FlushFinalBlock();
 StringBuilder ret = new StringBuilder();
 foreach (byte b in mStream.ToArray())
 {
 ret.AppendFormat("{0:X2}", b);
 }
 ret.ToString();
 return ret.ToString(); 
 }
 catch
 {
 return null;
 }
 }

 /// <summary>
 /// DES解密字符串
 /// </summary>
 /// <param name="decryptString">待解密的字符串</param>
 /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
 /// <returns>解密成功返回解密后的字符串，失败返回null</returns>
 public static string DecryptDES(string decryptString, string decryptKey = "11001100")
 {
 try
 {
 byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(decryptKey);
 byte[] rgbIV = rgbKey;
 byte[] inputByteArray = new byte[decryptString.Length / 2];
 for (int x = 0; x < decryptString.Length / 2; x++)
 {
 int i = (Convert.ToInt32(decryptString.Substring(x * 2, 2), 16));
 inputByteArray[x] = (byte)i;
 } 
 DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
 MemoryStream mStream = new MemoryStream();
 CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
 cStream.Write(inputByteArray, 0, inputByteArray.Length);
 cStream.FlushFinalBlock();
 return Encoding.UTF8.GetString(mStream.ToArray());
 }
 catch
 {
 return null;
 }
 }
 }
}

以上就是PHP和C#可共用的可逆加密算法，希望对大家的学习有所帮助。