zitadel/internal/domain/human_otp.go

package domain

import (
	"github.com/pquerna/otp"
	"github.com/pquerna/otp/totp"
	"github.com/zitadel/zitadel/internal/crypto"
	caos_errs "github.com/zitadel/zitadel/internal/errors"
	es_models "github.com/zitadel/zitadel/internal/eventstore/v1/models"
)

type OTP struct {
	es_models.ObjectRoot

	Secret       *crypto.CryptoValue
	SecretString string
	Url          string
	State        MFAState
}

func NewOTPKey(issuer, accountName string, cryptoAlg crypto.EncryptionAlgorithm) (*otp.Key, *crypto.CryptoValue, error) {
	key, err := totp.Generate(totp.GenerateOpts{Issuer: issuer, AccountName: accountName})
	if err != nil {
		return nil, nil, err
	}
	encryptedSecret, err := crypto.Encrypt([]byte(key.Secret()), cryptoAlg)
	if err != nil {
		return nil, nil, err
	}
	return key, encryptedSecret, nil
}

func VerifyMFAOTP(code string, secret *crypto.CryptoValue, cryptoAlg crypto.EncryptionAlgorithm) error {
	decrypt, err := crypto.DecryptString(secret, cryptoAlg)
	if err != nil {
		return err
	}

	valid := totp.Validate(code, decrypt)
	if !valid {
		return caos_errs.ThrowInvalidArgument(nil, "EVENT-8isk2", "Errors.User.MFA.OTP.InvalidCode")
	}
	return nil
}