（1）使用C＃生成密钥/ iv对：TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider（）;
MemoryStream m = new MemoryStream(Convert.FromBase64String(Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(plainText))));
CryptoStream cs = new CryptoStream(m, cp.CreateEncryptor(cp.Key, cp.IV), CryptoStreamMode.Read);
cp.Key = Convert.FromBase64String("BeaYzNeHfDb27OFYgaYHUd5HUJE2aZyI");
cp.IV = Convert.FromBase64String("T/ENF5G4sCA=");
string key = Convert.ToBase64String(cp.Key);
string iv = Convert.ToBase64String(cp.IV);
// write key/iv to a file here
（2）一旦有了，就可以使用像这样的代码进行编码
TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider();
MemoryStream m = new MemoryStream(Convert.FromBase64String(Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(plainText))));
CryptoStream cs = new CryptoStream(m, cp.CreateEncryptor(cp.Key, cp.IV), CryptoStreamMode.Read);
cp.Key = Convert.FromBase64String("the key value from above");
cp.IV = Convert.FromBase64String("the iv value from above");
string key = Convert.ToBase64String(cp.Key);
string iv = Convert.ToBase64String(cp.IV);
List<byte> r = new List<byte>();
int x = 0;
for (; x > -1; )
{
x = cs.ReadByte();
if (x > -1)
r.Add((byte)x);
}
byte[] y = r.ToArray();
string cypherText = Convert.ToBase64String(y);
（3）然后解码：
TripleDESCryptoServiceProvider cp = new TripleDESCryptoServiceProvider();
MemoryStream m = new MemoryStream(Convert.FromBase64String(cypherText));
cp.Key = Convert.FromBase64String("the key value from above");
cp.IV = Convert.FromBase64String("the iv value from above");
CryptoStream cs = new CryptoStream(m, cp.CreateDecryptor(cp.Key, cp.IV), CryptoStreamMode.Read);
StreamReader reader = new StreamReader(cs);
string plainText = reader.ReadToEnd();
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