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/// <summary>
/// 3DES加密方法
/// </summary>
/// <param name="strPlain">明文</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <param name="ReturnBytes">标志位,如果返回数组则填写标志位</param>
/// <returns>密文</returns>
public static byte[] TripleDESEncrypt(string strPlain, string strDESKey, string strDESIV, bool ReturnBytes)
{
//把密钥转换成字节数组
byte[] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
//把向量转换成字节数组
byte[] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
//声明1个新的3DES对象
TripleDESCryptoServiceProvider tripledesEncrypt = new TripleDESCryptoServiceProvider();
//开辟一块内存流
MemoryStream msEncrypt = new MemoryStream();
//把内存流对象包装成加密流对象
CryptoStream csEncrypt = new CryptoStream(msEncrypt, tripledesEncrypt.CreateEncryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Write);
//把加密流对象包装成写入流对象
StreamWriter swEncrypt = new StreamWriter(csEncrypt);
//写入流对象写入明文
swEncrypt.WriteLine(strPlain);
//写入流关闭
swEncrypt.Close();
//加密流关闭
csEncrypt.Close();
//把内存流转换成字节数组,内存流现在已经是密文了
byte[] bytesCipher = msEncrypt.ToArray();
//内存流关闭
msEncrypt.Close();
tripledesEncrypt.Clear();
return bytesCipher;
}
/// <summary>
/// 3DES解密方法
/// </summary>
/// <param name="bytes">包含密文的字节数组</param>
/// <param name="lenght">字节数组中需要加密的字节长度</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <returns>明文</returns>
public static string TripleDESDecrypt(byte[] bytes, int lenght, string strDESKey, string strDESIV)
{
//把密钥转换成字节数组
byte[] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
//把向量转换成字节数组
byte[] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
byte[] bytesCipher = new byte[lenght];
Array.Copy(bytes, bytesCipher, lenght);
//声明1个新的3DES对象
TripleDESCryptoServiceProvider tripledesDecrypt = new TripleDESCryptoServiceProvider();
//开辟一块内存流,并存放密文字节数组
MemoryStream msDecrypt = new MemoryStream(bytesCipher);
//把内存流对象包装成解密流对象
CryptoStream csDecrypt = new CryptoStream(msDecrypt, tripledesDecrypt.CreateDecryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Read);
//把解密流对象包装成读出流对象
StreamReader srDecrypt = new StreamReader(csDecrypt);
//明文=读出流的读出内容
string strPlainText = srDecrypt.ReadLine();
//读出流关闭
srDecrypt.Close();
//解密流关闭
csDecrypt.Close();
//内存流关闭
msDecrypt.Close();
//返回明文
tripledesDecrypt.Clear();
return strPlainText;
}
//然后用这两个方法对字符串加密:
sMsg = "{\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fcharset134 \'cb\'ce\'cc\'e5;}}
\viewkind4\uc1\pard\lang2052\f0\fs18 1
}";
byte[] ByteData = Security.TripleDESEncrypt(sMsg, strKey,strIV, true);
//进行解密:
string s = TripleDESDecrypt(ByteData, ByteData.Length,strKey,strIV);
//解密后字符串为:{\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fcharset134 \'cb\'ce\'cc\'e5;}}
/// <summary>
/// 你的注释...
/// </summary>
public static string TripleDESDecrypt(byte[] bytes, int lenght, string DESKey, string DESIv)
{
byte[] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(DESKey);
byte[] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(DESIv);
// 为什么要拷贝...
byte[] bytesCipher = new byte[ Length ];
Array.Copy(bytes, bytesCipher, lenght);
using( TripleDESCryptoServiceProvider tripledes = new TripleDESCryptoServiceProvider())
using( MemoryStream ms = new MemoryStream(bytesCipher) )
using( CryptoStream cs = new CryptoStream(ms, tripledes.CreateDecryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Read) )
using (StreamReader sr = new StreamReader(cs))
{
return sr.ReadToEnd();
}
}