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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.IO;
using System.Text;
/// <summary>
/// Des 的摘要说明
/// </summary>
public class Des
{
public Des()
{
}
public static string Encrypt(string stringToEncrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(stringToEncrypt);
des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
des.IV = ASCIIEncoding.UTF8.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();
}
public static string Decrypt(string stringToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[stringToDecrypt.Length / 2];
for (int x = 0; x < stringToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(stringToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
des.IV = ASCIIEncoding.UTF8.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());
}
}
![复制代码](https://common.cnblogs.com/images/copycode.gif)
string key = "cba1238b";
string abc= Des.Encrypt("abc", key);
Response.Write(abc);
Response.Write("<hr>");
string abc2 = Des.Decrypt(abc, key);
Response.Write(abc2);
来源:C#des加密解密 - 自由无风 - 博客园 (cnblogs.com)