public static SecurityCodePair GenerateSmsCode(TimeSpan expirationPeriod)
{
Argument.Satisfies(expirationPeriod, x => x.Ticks > 0, "expirationPeriod", "Expiration period should be positive");
using (var rng = new RNGCryptoServiceProvider())
{
var byteCode = new byte[8];
rng.GetBytes(byteCode);
var code = BitConverter.ToUInt64(byteCode, 0);
var smsCode = (code % 100000UL).ToString(CultureInfo.InvariantCulture).PadLeft(6, '0');
var id = Guid.NewGuid();
var privateCode = new SecurityCode(id, expirationPeriod, smsCode);
var publicCode = new PublicSecurityCode(id, smsCode);
return(new SecurityCodePair(privateCode, publicCode));
}
}
private SecurityCodePair(SecurityCode privateSecurityCode, PublicSecurityCode publicSecurityCode)
{
_privateSecurityCode = privateSecurityCode;
_publicSecurityCode = publicSecurityCode;
}