Crate libotp

HMAC and Time-Based One-Time-Password implementations based on RFC4226 and RFC6238.

Examples

use libotp::{HOTP, TOTP};

const TOTP_STEP: u64 = 30;
const OTP_DIGITS: u32 = 8;

fn check_user_otp(user: User, guess: u32) -> bool {
    // get the shared secret from some database.
    let secret = user.get_totp_secret();

    // create a HOTP instance & TOTP instance
    let hotp = HOTP::from_bin(secret).unwrap();
    let totp = TOTP::new(hotp, TOTP_STEP, 0);

    // validate guess with TOTP
    return totp.validate(OTP_DIGITS, guess, 0);
}

fn get_user_otp(user: User) -> u32 {
    // get shared secret
    let secret = user.get_totp_secret();

    return TOTP::new(
        HOTP::from_bin(secret).unwrap(),
        TOTP_STEP,
        0).get_otp(OTP_DIGITS, 0);
}

Structs

HOTP	This is the secret that will be used to generate HMAC based one-time-passwords.
TOTP	Provides Time based One Time Passwords.

Enums

HOTPAlgorithm