public bool ValidateRecoveryCode(string code, IMultiFactorSettings mfa)
{
var otps = this.ToHotp(mfa);
var otp = new OtpGenerator(otps);
return(otp.Generate(offset: mfa.RecoveryTripCount) == code);
}
public bool ValidateCode(string code, IMultiFactorSettings mfa)
{
var otps = this.ToTotp(mfa);
var otp = new OtpGenerator(otps);
return(otp.GenerateWindow().Contains(code));
}
public MfaSettingsModel GenerateClientData(IMultiFactorSettings mfa, string label, string issuer, string continuation)
{
var otps = new TotpGeneratorSettings(label, issuer, mfa.Secret, ByteEncoding.Base32, (HmacAlgorithm)mfa.HmacAlgorithm, mfa.Digits, mfa.Additional, mfa.Period);
var uri = otps.ToUri().OriginalString;
return(new MfaSettingsModel
{
AuthenticatorUri = uri,
RecoveryCodes = this.GenerateRecoveryCodes(mfa),
Continuation = continuation
});
}
public IEnumerable <string> GenerateRecoveryCodes(IMultiFactorSettings mfa)
{
var recs = this.ToHotp(mfa);
var otp = new OtpGenerator(recs);
for (var i = 0; i < 10; i++)
{
var code = otp.Generate(groupSize: 4);
if (i >= mfa.RecoveryTripCount)
{
yield return(code);
}
}
}
private OtpGeneratorSettings ToTotp(IMultiFactorSettings mfa)
=> mfa.Type switch
{