C# 加密－TripleDES

TripleDES
属对称加密，对称加密在加密和解密时都使用相同的密钥，速度快。
TripleDESCryptoServiceProvider 的名称空间是：
System.Security.Cryptography
byte[] plaintextBuffer = System.Text.Encoding.UTF8.GetBytes("明文");
//加密
TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
ICryptoTransform transform = tripleDES.CreateEncryptor();
byte[] cipherTextBuffer = transform.TransformFinalBlock(plaintextBuffer, 0, plaintextBuffer.Length);
lbl.Text = Convert.ToBase64String(cipherTextBuffer) + "<br />";
transform.Dispose();
//解密
TripleDESCryptoServiceProvider tripleDES2 = new TripleDESCryptoServiceProvider();
ICryptoTransform transform2 = tripleDES2.CreateDecryptor(tripleDES.Key, tripleDES.IV);
byte[] decryption = transform2.TransformFinalBlock(cipherTextBuffer, 0, cipherTextBuffer.Length);
lbl.Text += System.Text.Encoding.UTF8.GetString(decryption) + "<br />";
transform2.Dispose();
解密时，使用加密的 Key 和 IV。