C#实现3DES加密

Code
    public class TRIP3DES

    {

        //密钥

        private string sKey = "qJzGEh6hESZDVJeCnFPGuxzaiB7NLQM3"; 

        //矢量，矢量可以为空

        private string sIV = "qcDY6X+aPLw=";

        //构造一个对称算法

        private SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();

 

        public TRIP3DES(string _sKey,string _sIV)
        {
            sKey=_sKey;
            sIV=_sIV;
        }

 

        #region public string EncryptString(string Value)

        /// 

        /// 加密字符串

        /// 

        /// 输入的字符串

        /// 加密后的字符串

        public string EncryptString(string Value)

        {

            ICryptoTransform ct;

            MemoryStream ms;

            CryptoStream cs;

            byte[] byt;

            mCSP.Key = Convert.FromBase64String(sKey);

            mCSP.IV = Convert.FromBase64String(sIV);

            //指定加密的运算模式

            mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;

            //获取或设置加密算法的填充模式

            mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

            ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);

            byt = Encoding.UTF8.GetBytes(Value);

            ms = new MemoryStream();

            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);

            cs.Write(byt, 0, byt.Length);

            cs.FlushFinalBlock();

            cs.Close();

            //return Convert.ToBase64String(ms.ToArray());
            //return Convert.ToChar(ms.ToArray()).ToString();

            string strResult="";
            byte[] b=ms.ToArray();
            for(int i=0;i<b.Length;i++)
            {
                strResult += b[i].ToString("x").PadLeft(2,'0');
            }
            return strResult;
        }

        #endregion

 

        #region public string DecryptString(string Value)

        /// 

        /// 解密字符串

        /// 

        /// 加过密的字符串

        /// 解密后的字符串

        public string DecryptString(string Value)

        {

            ICryptoTransform ct;

            MemoryStream ms;

            CryptoStream cs;

            byte[] byt;

            mCSP.Key = Convert.FromBase64String(sKey);

            mCSP.IV = Convert.FromBase64String(sIV);

            mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;

            mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

            ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);

            //byt = Convert.FromBase64String(Value);

            byt=new byte[Value.Length/2];
            int bi=0;
            for (int i=0;i<Value.Length;i+=2)
            {
                byt[bi]= (byte)Int32.Parse(Value.Substring(i,2),System.Globalization.NumberStyles.HexNumber);
                bi++;
            }

            ms = new MemoryStream();

            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);

            cs.Write(byt, 0, byt.Length);

            cs.FlushFinalBlock();

            cs.Close();

 

            return Encoding.UTF8.GetString(ms.ToArray());

        }

        #endregion

    }

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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


public partial class Default3 : System.Web.UI.Page
{
    //密钥
    private const string sKey = "5tpMC2dovLDHzt/pRr/TOGSJPXANLG51";

    protected void Page_Load(object sender, EventArgs e)
    {
        //Response.Write(EncryptString("aabbcc"));
        //Response.Write("<BR>");
        //Response.Write(DecryptString(EncryptString("aabbcc")));


        //string transDesKey = "L/Lcp55e4H8OMelF1nw9yMhhpFvymI9b";
        //Encrypt3DES test = new Encrypt3DES(transDesKey);
        //Response.Write(EncryptString("aabbcc"));
        //test.EncryptString("aabbcc");
    }
    
    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="encryptValue"></param>
    /// <returns></returns>
    private string EncryptString(string encryptValue)
    {
        TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
        des.Key = Convert.FromBase64String(sKey);
        des.Mode = CipherMode.ECB;

        byte[] valBytes = Encoding.Unicode.GetBytes(encryptValue);
        ICryptoTransform transform = des.CreateEncryptor();

        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, transform, CryptoStreamMode.Write);
        cs.Write(valBytes, 0, valBytes.Length);
        cs.FlushFinalBlock();
        byte[] returnBytes = ms.ToArray();
        cs.Close();

        return Convert.ToBase64String(returnBytes);
    }

    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="encryptedValue"></param>
    /// <returns></returns>
    private string DecryptString(string encryptedValue)
    {
        TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
        des.Key = Convert.FromBase64String(sKey);
        des.Mode = CipherMode.ECB;

        byte[] valBytes = Convert.FromBase64String(encryptedValue);
        ICryptoTransform transform = des.CreateDecryptor();

        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, transform, CryptoStreamMode.Write);
        cs.Write(valBytes, 0, valBytes.Length);
        cs.FlushFinalBlock();
        byte[] returnBytes = ms.ToArray();
        cs.Close();

        return Encoding.Unicode.GetString(returnBytes);
    }

    //private string ByteToHex(byte[] byteArray)
    //{
    //    string outString = "";
    //    foreach (Byte b in byteArray)
    //        outString += b.ToString("X2");
    //    return outString;
    //}

    //private byte[] HexToByte(string hexString)
    //{
    //    byte[] returnBytes = new byte[hexString.Length / 2];
    //    for (int i = 0; i < returnBytes.Length; i++)
    //        returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
    //    return returnBytes;
    //}

}


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