NetSkycn.Security/DESProvider.cs

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

namespace NetSkycn.Security
{
    /// <summary>
    /// DESEncrypt加密解密算法。
    /// </summary>
    public sealed class DESProvider
    {
        private DESProvider()
        {

        }

        private static string key = "netskycn";

        /// <summary>
        /// 对称加密解密的密钥
        /// </summary>
        public static string Key
        {
            get
            {
                return key;
            }
            set
            {
                key = value;
            }
        }

        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="encryptString">要加密的字符串</param>
        /// <returns></returns>
        public static string Encrypt(string encryptString)
        {
            if (string.IsNullOrEmpty(encryptString))
            {
                throw new ArgumentNullException("encryptString", "不能为空");
            }
            byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            byte[] keyIV = keyBytes;
            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Convert.ToBase64String(mStream.ToArray());
        }

        /// <summary>
        /// DES解密
        /// </summary>