public static bool ValidateCode(byte[] securityToken, int code, string modifier = null)
{
var sectokenstring = Base32.ToBase32(securityToken);
Console.Write(sectokenstring);
if (securityToken == null)
{
throw new ArgumentNullException(nameof(securityToken));
}
// Allow a variance of no greater than 90 seconds in either direction
var currentTimeStep = GetCurrentTimeStepNumber();
using (var hashAlgorithm = new HMACSHA1(securityToken))
{
for (var i = -2; i <= 2; i++)
{
var computedTotp = ComputeTotp(hashAlgorithm, (ulong)((long)currentTimeStep + i), modifier);
if (computedTotp == code)
{
return(true);
}
}
}
// No match
return(false);
}
public static string GenerateStandardSecret()
{
return(Base32.ToBase32(GenerateRandomKey(20)));
}