TFA/MFA clients that produce a ‘one time’ numeric code require a secret that they share with the server validating the authentication. If my phone bricks, is lost or stolen, I can still get access to my TFA-protected accounts if I can access any of those other computers, or any other computer on which I can install and run authenticator and access a copy of my accounts file. I keep a copy of the accounts file in a variety of places. Personally, I use both Google Authenticator on my iPhone and iPad, and run authenticator on several different computer systems. The benefit of using authenticator over a phone app is that this CLI utility can run anywhere Python 3.5 can run from a command line interface (e.g., a terminal window), and the database of accounts and secrets is a platform-independent passphrase-protected encrypted file that can be backed up and can be copied to multiple systems without fear of bad actors gaining access to the second factor authentication.Īnother benefit is that authenticator can act as a backup in case you loose your phone or tablet (running Google Authenticator) or Google breaks the app or withdraws it. It is a TOTP/HOTP client that can generate the numeric codes needed for authentication with sites that support Two-Factor Authentication (TFA) or Multi-Factor Authentication (MFA). func (t *TOTP) VerifyTime(otp string, timestamp time.Authenticator is a CLI analog to the Google Authenticator phone app, or the LastPass Authenticator phone app.func (t *TOTP) Verify(otp string, timestamp int64) bool.func (t *TOTP) ProvisioningUri(accountName, issuerName string) string.func (t *TOTP) NowWithExpiration() (string, int64).func (t *TOTP) AtTime(timestamp time.Time) string. ![]() func (t *TOTP) At(timestamp int64) string.func NewTOTP(secret string, digits, interval int, hasher *Hasher) *TOTP.func NewDefaultTOTP(secret string) *TOTP.func NewOTP(secret string, digits int, hasher *Hasher) OTP.func (h *HOTP) Verify(otp string, count int) bool.func (h *HOTP) ProvisioningUri(accountName, issuerName string, initialCount int) string.func NewHOTP(secret string, digits int, hasher *Hasher) *HOTP.func NewDefaultHOTP(secret string) *HOTP.func BuildUri(otpType, secret, accountName, issuerName, algorithm string.GOTP is licensed under the MIT License Expand ▾ Collapse ▴ Now run the following and compare the output: package mainįmt.Println("Current OTP is", gotp.NewDefaultTOTP("4S62BZNFXXSZLCRO").Now()) Scan the following barcode with your phone's OTP app (e.g. This URL can then be rendered as a QR Code which can then be scanned and added to the users list of OTP credentials. Gotp.NewDefaultHOTP("4S62BZNFXXSZLCRO").ProvisioningUri("demoAccountName", "issuerName", 1) Scanner built into these MFA client apps via otpObj.ProvisioningUri method: gotp.NewDefaultTOTP("4S62BZNFXXSZLCRO").ProvisioningUri("demoAccountName", "issuerName") GOTP includes the ability to generate provisioning URIs for use with the QR Code GOTP works with the Google Authenticator iPhone and Android app, as well as other OTP apps like Authy. Gotp.RandomSecret(secretLength) // LMT4URYNZKEWZRAA Generate random secret secretLength := 16 otpauth://hotp/issuerName:demoAccountName?secret=4S62BZNFXXSZLCRO&counter=1&issuer=issuerName Hotp.ProvisioningUri("demoAccountName", "issuerName", 1) otpauth://totp/issuerName:demoAccountName?secret=4S62BZNFXXSZLCRO&issuer=issuerNameĬounter-based OTPs hotp := gotp.NewDefaultHOTP("4S62BZNFXXSZLCRO") Totp.ProvisioningUri("demoAccountName", "issuerName") Installation $ go get /xlzd/gotpĬheck API docs at Time-based OTPs totp := gotp.NewDefaultTOTP("4S62BZNFXXSZLCRO") GOTP implements server-side support for both of these standards. Open MFA standards are defined in RFC 4226 (HOTP: An HMAC-Based One-Time Password Algorithm) and in RFC 6238 (TOTP: Time-Based One-Time Password Algorithm). It can be used to implement two-factor (2FA) or multi-factor (MFA) authentication methods in anywhere that requires users to log in. GOTP is a Golang package for generating and verifying one-time passwords. GOTP - The Golang One-Time Password Library
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