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. It adds 2 fields to TOTP.

serde_support

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

gen_secret

With optional feature “gen_secret”, a secret will be generated for you to store in database.

Examples

Summary

0. Understanding Secret
1. Generate a token
2. Enable qrcode generation
3. Enable serde support
4. Enable otpauth url support
5. Enable gen_secret support
6. With RFC-6238 compliant default

Understanding Secret

This new type was added as a disambiguation between Raw and already base32 encoded secrets.

    Secret::Raw("TestSecretSuperSecret".as_bytes().to_vec())

Is equivalent to

    Secret::Encoded("KRSXG5CTMVRXEZLUKN2XAZLSKNSWG4TFOQ".to_string())

Generate a token

Add it to your Cargo.toml:

[dependencies]
totp-rs = "^3.0"

You can then do something like:

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

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        Secret::Raw("TestSecretSuperSecret".as_bytes().to_vec()).to_bytes().unwrap(),
    ).unwrap();
    let token = totp.generate_current().unwrap();
    println!("{}", token);   
}

Which is equivalent to:

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

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        Secret::Encoded("KRSXG5CTMVRXEZLUKN2XAZLSKNSWG4TFOQ".to_string()).to_bytes().unwrap(),
    ).unwrap();
    let token = totp.generate_current().unwrap();
    println!("{}", token);   
}

With qrcode generation

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^3.0"
features = ["qr"]

You can then do something like:

use totp_rs::{Algorithm, TOTP, Secret};

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        Secret::Encoded("KRSXG5CTMVRXEZLUKN2XAZLSKNSWG4TFOQ".to_string()).to_bytes().unwrap(),
        Some("Github".to_string()),
        "constantoine@github.com".to_string(),
    ).unwrap();
    let code = totp.get_qr()?;
    println!("{}", code);   
}

With serde support

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^3.0"
features = ["serde_support"]

With otpauth url support

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^3.0"
features = ["otpauth"]

You can then do something like:

use totp_rs::TOTP;

fn main() {
    let otpauth = "otpauth://totp/GitHub:constantoine@github.com?secret=KRSXG5CTMVRXEZLUKN2XAZLSKNSWG4TFOQ&issuer=GitHub";
    let totp = TOTP::from_url(otpauth).unwrap();
    println!("{}", totp.generate_current().unwrap());
}

With gen_secret

Add it to your Cargo.toml:

[dependencies.totp-rs]
version = "^3.0"
features = ["gen_secret"]

You can then do something like:

use totp_rs::{Algorithm, TOTP, Secret};

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        Secret::default().to_bytes().unwrap(),
        Some("Github".to_string()),
        "constantoine@github.com".to_string(),
    ).unwrap();
    let code = totp.get_qr()?;
    println!("{}", code);   
}

Which is equivalent to

use totp_rs::{Algorithm, TOTP, Secret};

fn main() {
    let totp = TOTP::new(
        Algorithm::SHA1,
        6,
        1,
        30,
        Secret::generate_secret().to_bytes().unwrap(),
        Some("Github".to_string()),
        "constantoine@github.com".to_string(),
    ).unwrap();
    let code = totp.get_qr()?;
    println!("{}", code);   
}

With RFC-6238 compliant default

You can do something like this

use totp_rs::{Algorithm, TOTP, Secret, Rfc6238};

fn main () {
    let mut rfc = Rfc6238::with_defaults(
            Secret::Encoded("KRSXG5CTMVRXEZLUKN2XAZLSKNSWG4TFOQ".to_string()).to_bytes().unwrap(),
        )
        .unwrap();

    // optional, set digits
    rfc.digits(8).unwrap();

    // create a TOTP from rfc
    let totp = TOTP::from_rfc6238(rfc).unwrap();
    let code = totp.generate_current().unwrap();
    println!("code: {}", code);
}

With gen_secret feature, you can go even further and have all values by default and a secure secret.

Note: With otpauth feature, TOTP.issuer will be None, and TOTP.account_name will be "". Be sure to set those fields before generating an URL/QRCode

fn main() {
    let totp = TOTP::default();
    println!("code: {}", code);
}