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otp

build-img pkg-img reportcard-img coverage-img version-img

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.