otp

One time password for Go.

Features

• Simple API.
• Dependency-free.
• Clean and tested code.
• HOTP RFC 4226.
• TOTP RFC 6238.

See GUIDE.md for more details.

Install

Go version 1.17+

go get github.com/cristalhq/otp

Example

secretInBase32 := "JBSWY3DPEHPK3PXP"

algo := otp.AlgorithmSHA1
digits := otp.Digits(10)
issuer := "cristalhq"

hotp, err := otp.NewHOTP(algo, digits, issuer)
checkErr(err)

code, err := hotp.GenerateCode(42, secretInBase32)
checkErr(err)

fmt.Println(code)

err = hotp.Validate(code, 42, secretInBase32)
checkErr(err)

// Output:
// 0979090604

Also see examples: examples_test.go.

Documentation

See these docs.

License

MIT License.