C# 3Des加密解密
C#使用填充模式"PaddingMode.PKCS7和CipherMode.CBC"，可按需修改，使用CBC模式的话在C#下必须传入加密向量IV(固定长度8位)，默认"12345678"，加密密钥和IV双方约定好即可，如果是ECB编码模式，那么就无须使用加密向量。
最主要的类为：TripleDESCryptoServiceProvider
C#代码如下：
using System;using System.IO;using System.Security.Cryptography;using System.Text;namespace TCWireless.Utility{public class DESHelper{#region 3des加密/// <summary>/// 3des ecb模式加密/// </summary>/// <param name="aStrString">待加密的字符串</param>/// <param name="aStrKey">密钥</param>/// <param name="iv">加密矢量：只有在CBC解密模式下才适用</param>/// <param name="mode">运算模式</param>/// <returns>加密后的字符串</returns>public static string Encrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678"){try{var des = new TripleDESCryptoServiceProvider{Key = Encoding.UTF8.GetBytes(aStrKey),Mode = mode};if (mode == CipherMode.CBC){des.IV = Encoding.UTF8.GetBytes(iv);}var desEncrypt = des.CreateEncryptor();byte[] buffer = Encoding.UTF8.GetBytes(aStrString);return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));}catch (Exception e){return string.Empty;}}#endregion#region 3des解密/// <summary>/// des 解密/// </summary>/// <param name="aStrString">加密的字符串</param>/// <param name="aStrKey">密钥</param>/// <param name="iv">解密矢量：只有在CBC解密模式下才适用</param>/// <param name="mode">运算模式</param>/// <returns>解密的字符串</returns>public static string Decrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678"){try{var des = new TripleDESCryptoServiceProvider{Key = Encoding.UTF8.GetBytes(aStrKey),Mode = mode,Padding = PaddingMode.PKCS7};if (mode == CipherMode.CBC){des.IV = Encoding.UTF8.GetBytes(iv);}var desDecrypt = des.CreateDecryptor();var result = "";byte[] buffer = Convert.FromBase64String(aStrString);result = Encoding.UTF8.GetString(desDecrypt.TransformFinalBlock(buffer, 0, buffer.Length));return result;}catch (Exception e){return string.Empty;}}#endregion}}
参考资料：
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