c#3des，base64加密

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

/// <summary>
/// CryptTo 实现加密、解密算法
/// </summary>
public class CryptTo
{
    /// <summary>
    /// 根据任意字符生成Des密钥
    /// </summary>
    /// <param name="secret">生成密钥的种子字</param>
    /// <returns>返回合格的Des密钥</returns>
    public static byte[] CreateKey(string secret)
    {
        if ((secret == null) || (secret.Length == 0))
            throw new ArgumentException("Secret is not valid");

        byte[] temp;

        temp = Hash(new ASCIIEncoding().GetBytes(secret));

        byte[] ret = new byte[24];

        int i;

        if (temp.Length < 24)
        {
            System.Array.Copy(temp, 0, ret, 0, temp.Length);
            for (i = temp.Length; i < 24; i++)
                ret[i] = 0;
        }
        else
            System.Array.Copy(temp, 0, ret, 0, 24);

        return ret;
    }

    /// <summary>
    /// 根据任意字符生成Des密钥
    /// </summary>
    /// <param name="secret">生成密钥的种子字</param>
    /// <returns>返回合格的Des密钥</returns>
    public static string GenerateKey(string secret)
    {
        return Convert.ToBase64String(CreateKey(secret));
    }

    /// <summary>
    /// 随机生成Des密钥
    /// </summary>
    /// <returns>返回合格的Des密钥</returns>
    public static string GenerateKey()
    {
        string ret;
        TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();

        TDES.GenerateKey();
        ret = Convert.ToBase64String(TDES.Key);

        return (ret);
    }

    /// <summary>
    /// 使用TripledDES加密
    /// </summary>
    /// <param name="content">要加密的内容</param>
    /// <param name="secret">密钥</param>
    /// <returns>加密后的结果</returns>
    public static string Encrypt(string content, string secret)
    {
        if ((content == null) || (secret == null) || (content.Length == 0) || (secret.Length == 0))
            throw new ArgumentNullException("Invalid Argument");

        try
        {
            byte[] Key = Convert.FromBase64String(secret);
            byte[] ContentByte = Encoding.Unicode.GetBytes(content);
            byte[] ContentCryptByte = Encrypt(ContentByte, Key);

            return Convert.ToBase64String(ContentCryptByte);
        }
        catch (Exception e)
        {
            throw e;
        }
    }

    /// <summary>
    /// 使用TripledDES解密
    /// </summary>
    /// <param name="content">要解密的内容</param>
    /// <param name="secret">密钥</param>
    /// <returns>解密后的结果</returns>
    public static string Decrypt(string content, string secret)
    {
        if ((content == null) || (secret == null) || (content.Length == 0) || (secret.Length == 0))
            throw new ArgumentNullException("Invalid Argument");

        try
        {
            byte[] Key = Convert.FromBase64String(secret);
            byte[] CryByte = Convert.FromBase64String(content);
            byte[] DecByte = Decrypt(CryByte, Key);

            return Encoding.Unicode.GetString(DecByte);
        }
        catch (Exception e)
        {
            throw e;
        }
    }

    /// <summary>
    /// 使用TripledDES加密
    /// </summary>
    /// <param name="source">要加密的内容</param>
    /// <param name="key">密钥</param>
    /// <returns>加密后的结果</returns>
    public static byte[] Encrypt(byte[] source, byte[] key)
    {
        if ((source.Length == 0) || (source == null) || (key == null) || (key.Length == 0))
        {
            throw new ArgumentException("Invalid Argument");
        }

        TripleDESCryptoServiceProvider dsp = new TripleDESCryptoServiceProvider();
        dsp.Mode = CipherMode.ECB;

        ICryptoTransform des = dsp.CreateEncryptor(key, null);

        try
        {
            return des.TransformFinalBlock(source, 0, source.Length);
        }
        catch (Exception e1)
        {
            throw e1;
        }
    }

    /// <summary>
    /// 使用TripledDES解密
    /// </summary>
    /// <param name="source">要解密的内容</param>
    /// <param name="key">密钥</param>
    /// <returns>解密后的结果</returns>
    public static byte[] Decrypt(byte[] source, byte[] key)
    {
        if ((source.Length == 0) || (source == null) || (key == null) || (key.Length == 0))
        {
            throw new ArgumentNullException("Invalid Argument");
        }

        TripleDESCryptoServiceProvider dsp = new TripleDESCryptoServiceProvider();
        dsp.Mode = CipherMode.ECB;

        ICryptoTransform des = dsp.CreateDecryptor(key, null);
        try
        {
            byte[] ret = new byte[source.Length + 8];

            des.TransformBlock(source, 0, source.Length, ret, 0);
            ret = des.TransformFinalBlock(source, 0, source.Length);
            ret = des.TransformFinalBlock(source, 0, source.Length);
            return ret;
        }
        catch (Exception e1)
        {
            throw e1;
        }
    }

    /// <summary>
    /// 使用md5计算散列
    /// </summary>
    /// <param name="source">要加密的内容</param>
    /// <returns>加密后的结果</returns>
    public static byte[] Hash(byte[] source)
    {
        if ((source == null) || (source.Length == 0))
            throw new ArgumentException("source is not valid");

        MD5 m = MD5.Create();
        return m.ComputeHash(source);
    }

    /// <summary>
    /// 使用md5计算散列
    /// </summary>
    /// <param name="source">要加密的内容</param>
    /// <returns>加密后的结果</returns>
    public static string Hash(string source)
    {
        // 两者的执行相同
        // return BitConverter.ToString(Hash(Encoding.ASCII.GetBytes(source)));

        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "md5");
    }

    /// <summary>
    /// 原始base64编码
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    public static byte[] Base64Encode(byte[] source)
    {
        if ((source == null) || (source.Length == 0))
            throw new ArgumentException("source is not valid");

        ToBase64Transform tb64 = new ToBase64Transform();
        MemoryStream stm = new MemoryStream();
        int pos = 0;
        byte[] buff;

        while (pos + 3 < source.Length)
        {
            buff = tb64.TransformFinalBlock(source, pos, 3);
            stm.Write(buff, 0, buff.Length);
            pos += 3;
        }

        buff = tb64.TransformFinalBlock(source, pos, source.Length - pos);
        stm.Write(buff, 0, buff.Length);

        return stm.ToArray();

    }

    /// <summary>
    /// 原始base64解码
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    public static byte[] Base64Decode(byte[] source)
    {
        if ((source == null) || (source.Length == 0))
            throw new ArgumentException("source is not valid");

        FromBase64Transform fb64 = new FromBase64Transform();
        MemoryStream stm = new MemoryStream();
        int pos = 0;
        byte[] buff;

        while (pos + 4 < source.Length)
        {
            buff = fb64.TransformFinalBlock(source, pos, 4);
            stm.Write(buff, 0, buff.Length);
            pos += 4;
        }

        buff = fb64.TransformFinalBlock(source, pos, source.Length - pos);
        stm.Write(buff, 0, buff.Length);
        return stm.ToArray();

    }

    public static string ToBase64(string source)
    {
        return Convert.ToBase64String(Encoding.Unicode.GetBytes(source));
    }

    public static string FromBase64(string source)
    {
        return Encoding.Unicode.GetString(Convert.FromBase64String(source));
    }
}

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