简单的 DES 加密解密

[c#]代码库

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
public class DesUtils
{

    //默认密钥向量
    //private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    private static byte[] Keys = { 1, 2, 3, 4, 5, 6, 7, 8 };
    private const string KEY = "abcdefgh";

    /// <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，失败返回源串</returns>
    public static string EncryptDES(string encryptString, string encryptKey = KEY)
    {
        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
        byte[] rgbIV = Keys;
        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();
        return Convert.ToBase64String(mStream.ToArray());
    }

    /// <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，失败返源串</returns>
    public static string DecryptDES(string decryptString, string decryptKey = KEY)
    {
        byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
        byte[] rgbIV = Keys;
        byte[] inputByteArray = Convert.FromBase64String(decryptString);
        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());
    }

    ///   <summary>  
    ///   给一个字符串进行MD5加密  
    ///   </summary>  
    ///   <param   name="strText">待加密字符串</param>  
    ///   <returns>加密后的字符串</returns>  
    public static string EncryptMD5(string strText)
    {
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
        byte[] bytValue, bytHash;
        bytValue = System.Text.Encoding.UTF8.GetBytes(strText);
        bytHash = md5.ComputeHash(bytValue);
        md5.Clear();
        string sTemp = "";
        for (int i = 0; i < bytHash.Length; i++)
        {
            sTemp += bytHash[i].ToString("X").PadLeft(2, '0');
        }
        return sTemp.ToUpper();
    }
}