src/DotNetCommon.Core/Encrypt/DESEncrypt.cs

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using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using DotNetCommon.Extensions;

namespace DotNetCommon.Encrypt
{
    /// <summary>
    /// DES加解密
    /// </summary>
    public static class DESEncrypt
    {

        /// <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,必须为8位ASCII码,否则不成功</param> 
        /// <exception cref="Exception">加密过程失败</exception>
        /// <returns>加密后的字符串(16进制表示法)</returns> 
        public static string Encrypt(string encryptString, string encryptKey)
        {
            if (string.IsNullOrEmpty(encryptString)) return encryptString;
            if (string.IsNullOrWhiteSpace(encryptKey) || encryptKey.Length != 8) throw new Exception("秘钥的长度必须为8!");
            byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(encryptKey);

            byte[] rgbIV = ASCIIEncoding.ASCII.GetBytes(MD5Encrypt.MD5(encryptKey).Substring(0, 8));
            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            des.Key = rgbKey;
            des.IV = rgbIV;
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, des.CreateEncryptor(), 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);
            }
            return ret.ToString();
        }
        /// <summary> 
        /// DES解密字符串 
        /// </summary> 
        /// <param name="decryptString">待解密的字符串</param> 
        /// <param name="decryptKey">加密密钥,必须为8位ASCII码,否则不成功</param> 
        /// <exception cref="Exception"></exception>
        /// <returns>解密后的字符串</returns> 
        public static string Decrypt(string decryptString, string decryptKey)
        {
            if (string.IsNullOrEmpty(decryptString)) return decryptString;
            if (string.IsNullOrWhiteSpace(decryptKey) || decryptKey.Length != 8) throw new Exception("秘钥的长度必须为8!");
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = decryptString.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;