The new authentication of bitstamp says the following:
Signature is a HMAC-SHA256 encoded message containing: nonce, client ID and API key. The HMAC-SHA256 code must be generated using a secret key that was generated with your API key. This code must be converted to it's hexadecimal representation (64 uppercase characters).Example (Python): message = nonce + client_id + api_key signature = hmac.new(API_SECRET, msg=message, digestmod=hashlib.sha256).hexdigest().upper()
Source: link
I've got the following code to add the new signature (and other parameters):
public void AddApiAuthentication(RestRequest restRequest)
{
var nonce = DateTime.Now.Ticks;
var signature = GetSignature(nonce, apiKey, apiSecret, clientId);
restRequest.AddParameter("key", apiKey);
restRequest.AddParameter("signature", signature);
restRequest.AddParameter("nonce", nonce);
}
private string GetSignature(long nonce, string key, string secret, string clientId)
{
string msg = string.Format("{0}{1}{2}", nonce,
clientId,
key);
return ByteArrayToString(SignHMACSHA256(secret, StrinToByteArray(msg))).ToUpper();
}
public static byte[] SignHMACSHA256(String key, byte[] data)
{
HMACSHA256 hashMaker = new HMACSHA256(Encoding.ASCII.GetBytes(key));
return hashMaker.ComputeHash(data);
}
public static byte[] StrinToByteArray(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
public static string ByteArrayToString(byte[] hash)
{
return BitConverter.ToString(hash).Replace("-", "").ToLower();
}
And then I get this error:
{"error": "Invalid signature"}
Anyone got an idea what the problem could be? I checked my parameters a 100 times and those aren't wrong. Maybe somebody got a working piece of code (in C#) for the new authentication?
UPDATE
Abhinav was right, the StringToByteArray method was wrong (not only the typo :P) the working code is:
public static byte[] StrinToByteArray(string str)
{
return System.Text.Encoding.ASCII.GetBytes(str);
}
