C# DES加密解密

using System;

using System.Text;

using System.Security.Cryptography;

using System.IO;



//默认密钥向量

private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

/// <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>加密成功返回加密后的字符串，失败返回源串</returns>

public static string EncryptDES(string encryptString, string encryptKey)

{

    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();

        return Convert.ToBase64String(mStream.ToArray());

    }

    catch

    {

        return encryptString;

    }

}



/// <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>解密成功返回解密后的字符串，失败返源串</returns>

public static string DecryptDES(string decryptString, string decryptKey)

{

    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();

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

    }

    catch

    {

        return decryptString;

    }

}