8K7LCBQZ

1public string BuildSignature(uint UserId, string Timestamp, string SecretKey)
2        {
3            ASCIIEncoding encoding = new ASCIIEncoding();
4            string signature = string.Empty;
5            string key = string.Format("{0:s}{1:zzzz}{2}", Timestamp, Timestamp, UserId);
6            
7            byte[] skbytes = encoding.GetBytes(SecretKey); // encode the secret key
8            byte[] keybytes = encoding.GetBytes(key); // encode the key;
9
10            HMACSHA1 hmacsha1 = new HMACSHA1(skbytes); // create the encryption object with the specified encoded secret key
11            byte[] hmessage = hmacsha1.ComputeHash(keybytes); // create a hash message
12
13            signature = ByteToString(hmessage).ToLower();
14
15 
16
17            return signature;
18        }
19
20protected virtual string ByteToString(byte[] buff)
21        {
22            string sbinary = "";
23
24            for (int i = 0; i < buff.Length; i++)
25            {
26                sbinary += buff[i].ToString("X2"); // hex format
27            }
28            return (sbinary);
29        }