【转】C# Des加密算法

最新推荐文章于 2021-03-24 17:04:47 发布

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最新推荐文章于 2021-03-24 17:04:47 发布

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文章标签： c#

原文链接：http://www.cnblogs.com/S-TGM/archive/2008/09/07/1286354.html

本文介绍了一个使用 C# 实现的 DESC 加密解密算法，该算法使用 DES 对称加密方式处理字符串。文章提供了完整的源代码，并强调了密钥 sKey 需为 8 位或 16 位字符的要求。

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C# Desc加密算法
使用注意事项:sKey要为8位,或16位字符

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

public class DesSecurity
{

/// <summary>
/// 加密原函数
/// </summary>
/// <param name="pToEncrypt"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public string DesEncrypt(string pToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
//return a;
}
/// <summary>
/// 解密原函数
/// </summary>
/// <param name="pToDecrypt"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public string DesDecrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}

}

转载于:https://www.cnblogs.com/S-TGM/archive/2008/09/07/1286354.html