［转载］MD5加密解密

MD5加密解密

using System;

using System.Text;

using System.IO;

using System.Security.Cryptography;

class Class1

{

static void Main()

{

Console.WriteLine("Encrypt String...");

txtKey = "tkGGRmBErvc=";//设置加密Key

btnKeyGen();

Console.WriteLine("Encrypt Key :{0}",txtKey);

txtIV = "Kl7ZgtM1dvQ=";//设置加密IV

btnIVGen();

Console.WriteLine("Encrypt IV :{0}",txtIV);

Console.WriteLine();

string txtEncrypted = EncryptString("测试");

Console.WriteLine("Encrypt String : {0}",txtEncrypted);

string txtOriginal = DecryptString(txtEncrypted);

Console.WriteLine("Decrypt String : {0}",txtOriginal);

}

private static SymmetricAlgorithm mCSP;

private static string txtKey;

private static string txtIV;

private static void btnKeyGen()

{

mCSP = SetEnc();

byte[] byt2 = Convert.FromBase64String(txtKey);

mCSP.Key = byt2;

}

private static void btnIVGen()

{

byte[] byt2 = Convert.FromBase64String(txtIV);

mCSP.IV = byt2;

}

private static string EncryptString(string Value)

{

ICryptoTransform ct;

MemoryStream ms;

CryptoStream cs;

byte[] byt;

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());

}

private static string DecryptString(string Value)

{

ICryptoTransform ct;

MemoryStream ms;

CryptoStream cs;

byte[] byt;

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

byt = Convert.FromBase64String(Value);

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());

}

private static SymmetricAlgorithm SetEnc()

{

return new DESCryptoServiceProvider();

}

}