private string CalculateHmacStringWithTpm(string value)
{
byte[] valueByteArray = Encoding.UTF8.GetBytes(value);
byte[] hmacByteArray = TpmHelper.CalculateHmac(valueByteArray);
// converte in stringa il valore calcolato e lo torna
return(Convert.ToBase64String(hmacByteArray));
}
private byte[] CypherHmac(byte[] digestBytes, string sharedKey)
{
if (enableTpm)
{
return(TpmHelper.CalculateHmac(digestBytes));
}
else
{
var secretKeyBytes = Convert.FromBase64String(sharedKey);
using (HMACSHA256 hmac = new HMACSHA256(secretKeyBytes))
{
return(hmac.ComputeHash(digestBytes));
}
}
}