static string Sign(string stringToSign, string deviceSymmetricKey)
{
IMacAlgorithmProvider algorithm = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha256);
PCLCrypto.CryptographicHash hash = algorithm.CreateHash(Convert.FromBase64String(deviceSymmetricKey));
hash.Append(Encoding.UTF8.GetBytes(stringToSign));
byte[] mac = hash.GetValueAndReset();
return(Convert.ToBase64String(mac));
}
public void Clear()
{
_hash = _hasher.CreateHash();
}
// Appends a given number of bytes to the hash
private static void Append(CryptographicHash hash, int bytesRead, byte[] buffer)
{
if (bytesRead == buffer.Length)
{
// append the whole buffer
hash.Append(buffer);
}
else
{
// only a part of the buffer should be appended, so need a smaller buffer
var partialBuffer = new byte[bytesRead];
Array.Copy(buffer, partialBuffer, bytesRead);
hash.Append(partialBuffer);
}
}
/// <summary>
/// Implements the Dispose pattern
/// </summary>
/// <param name="disposing">Whether this object is being disposed via a call to Dispose
/// or garbage collected.</param>
protected virtual void Dispose(bool disposing)
{
if (disposing && _hash != null)
{
_hash.Dispose();
_hash = null;
}
}
