totp-rs

This library permits the creation of 2FA authentification tokens per TOTP, the verification of said tokens, with configurable time skew, validity time of each token, algorithm and number of digits! Default features are kept as lightweight as possible to ensure small binaries and short compilation time.

It now supports parsing otpauth URLs into a totp object, with sane default values.

Be aware that some authenticator apps will accept the SHA256 and SHA512 algorithms but silently fallback to SHA1 which will make the check() function fail due to mismatched algorithms.

Features

qr

With optional feature “qr”, you can use it to generate a base64 png qrcode. This will enable feature otpauth

otpauth

With optional feature “otpauth”, support parsing the TOTP parameters from an otpauth URL, and generating an otpauth URL

serde_support

With optional feature “serde_support”, library-defined types TOTP and Algorithm and will be Deserialize-able and Serialize-able

How to use

Add it to your Cargo.toml:

[dependencies]
totp-rs = "^2.0"

You can then do something like:

use std::time::SystemTime;
use totp_rs::{Algorithm, TOTP};

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        "supersecret",
        Some("Github".to_string()),
        "constantoine@github.com".to_string(),
    ).unwrap();
    let token = totp.generate_current().unwrap();
    println!("{}", token);   
}

With qrcode generation

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^2.0"
features = ["qr"]

You can then do something like:

use totp_rs::{Algorithm, TOTP};

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        "supersecret",
        Some("Github".to_string()),
        "constantoine@github.com".to_string(),
    ).unwrap();
    let code = totp.get_qr("user@example.com", "my-org.com")?;
    println!("{}", code);   
}

With serde support

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^2.0"
features = ["serde_support"]

With otpauth url support

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^2.0"
features = ["otpauth"]

You can then do something like:

use totp_rs::TOTP;

fn main() {
    let otpauth = "otpauth://totp/GitHub:constantoine@github.com?secret=ABC&issuer=GitHub";
    let totp = TOTP::from_url(otpauth).unwrap();
    println!("{}", totp.generate_current().unwrap());
}