c# 中的等效 python hmac 方法

Question

I'm trying to pair my Philips TV in a .NET program i am wrting.

I found this awessome Python library nammed pylips and I am using it as a reference, but having a hard time with the signature method.

I dont know python, and have tried mutiple solution to reproduce same signature in c#

auth["auth_signature"] = self.create_signature(b64decode(secret_key), str(auth_Timestamp).encode() + str(pin).encode())
      
def create_signature(self, secret_key, to_sign):
sign = HMAC.new(secret_key, to_sign, SHA)
return str(b64encode(sign.hexdigest().encode()))

If i run "create_signature" in python with following arguments

to_sign= 1400493467    
secret_key = JCqdN5AcnAHgJYseUn7ER5k3qgtemfUvMRghQpTfTZq7Cvv8EPQPqfz6dDxPQPSu4gKFPWkJGw32zyASgJkHwCjU

I get this output

b'Y2NiNDQ4ZDcyYjg5ZmJlNzg1MWNiYjIyYzEwOGNhMTJmNWZmODYwNA=='

Answer 1

Normally, I have at least a couple of questions, but I think I can show a simple answer.

• Your to_sign is a concatenated string of a timestamp auth_Timestamp and some pin .

• You have to see how this timestamp is generated (in my example I imply it is the Unix-Time).

• The pin - is this the message actually or some other value (in my example I imply it is the message)?

• Which SHA algorithm are you using ( SHA )? Because the correct HMAC implementation depends on this (in my example I imply SHA256).

   static void Main(string[] args) { int message = 1400493467; string secret_key = "key"; string auth_Timestamp = (DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds.ToString();// is this the Unix-Time string pin = message.ToString(); // is this the message? string to_sign = auth_Timestamp + pin;//str(auth_Timestamp).encode() + str(pin).encode() string result = create_signature(secret_key, to_sign); Console.WriteLine(result); } private static string create_signature(string secret_key, string to_sign) { // Which SHA are you using? SHA256 (HMACSHA256), SHA1 (HMACSHA1) or something else using (var hmacsha256 = new HMACSHA256(Encoding.UTF8.GetBytes(secret_key))) { var hash = hmacsha256.ComputeHash(Encoding.UTF8.GetBytes(to_sign)); return Convert.ToBase64String(hash); } }