datp

datp is a lightweight Rust library for working with TOTP (Time-based One-Time Password) and generating QR codes for two-factor authentication.

Features

• Generate random TOTP secrets in base32.
• Compute TOTP codes for the current or a specific time.
• Generate SVG QR codes with customizable colors, size, and version.

Installation

Add to Cargo.toml:

[dependencies]
datp = "0.1.0"

Usage Examples

Generate a secret

use datp::generate_totp_secret;

let secret = generate_totp_secret(10);
println!("TOTP secret: {}", secret);

Get the current TOTP code

use datp::totp_raw_now;

let secret = "JBSWY3DPEHPK3PXP";
let code = totp_raw_now(secret, 30, 0).unwrap();
println!("Current TOTP code: {}", code);

TOTP code for a specific time

use datp::totp_raw;

let secret = "JBSWY3DPEHPK3PXP";
let code = totp_raw(secret, 30, 0, 1_388_865_600).unwrap();
println!("TOTP code at specific time: {}", code);

Generate a TOTP QR code

use datp::{totp_qr_svg, TotpQrConfig};
use qrcode::EcLevel;
use qrcode::Version;

let secret = "JBSWY3DPEHPK3PXP";
let config = TotpQrConfig {
    account_name: "user@example.com",
    issuer: "MyApp",
    dark_color: "#000080",
    light_color: "#ffffcc",
    min_dimension: 250,
    version: Version::Normal(5),
    ec_level: EcLevel::M,
};

let svg = totp_qr_svg(secret, &config);
std::fs::write("totp.svg", svg).unwrap();

Notes

• Uses Hmac<Sha1> for TOTP generation.
• Fully compatible with TOTP apps like Google Authenticator or Authy.
• QR code colors and size are customizable.