oyvindstegard / totp

Implementation of TOTP in a shell script

Implementation of TOTP in a shell script

The implementation is described in this blog post: https://stegard.net/2023/11/implementing-a-time-based-one-time-password-totp-generator/

Requirements

The following commands must be available in your PATH:

1. openssl
2. base32
3. xxd

Usage

$ echo "SOME_TOTP_BASE32_KEY" | ./totp

$ ./totp < .some_file_with_base32_key

$ gpg -d some_file_with_base32_key.gpg | ./totp

Example

$ echo XCGVLAD4EMLOV72B | ./topt
532405

Verify

Check results using https://www.verifyr.com/en/otp/check#totp