ptym.cs

来自「c# vs2005 asp.net2.0 一个des加/解密字符串的类,相信这方」· CS 代码 · 共 95 行

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

namespace Ptym
{
    public class Security
    {
        public Security()
        { 
        
        }

        //默认密钥向量
        private static byte[] Keys = { 0x14, 0x14, 0x21, 0x14, 0x14, 0x21, 0x14, 0x14 };

        private static string defaultiv ="yourself";


        public static string[] EncryptDES(string encryptString)
        {
            return EncryptDES(encryptString, defaultiv);
        }

        public static string[] DecryptDES(string decryptString)
        {
            return DecryptDES(decryptString, defaultiv);
        }

        /// <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>返回数组，string[0]=0为成功，=1为失败，失败时反回原始值</returns>
        public static string[] EncryptDES(string encryptString, string encryptKey)
        {
            string[] returnvalue = new string[2];
            try
            {
                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();
                returnvalue[0] = "0";
                returnvalue[1] = Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                returnvalue[0] = "1";
                returnvalue[1] = encryptString;
            }
            
            return returnvalue;
        }

        /// <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>返回数组，string[0]=0为成功，=1为失败，失败时反回原始值</returns>
        public static string[] DecryptDES(string decryptString, string decryptKey)
        {
            string[] returnvalue = new string[2];

            try
            {
                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();
                returnvalue[0] = "0";
                returnvalue[1] = Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                returnvalue[0] = "1";
                returnvalue[1] = decryptString;
            }
            return returnvalue;
        } 
    }
}