First commit

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "totp"
+version = "0.1.0"
+authors = ["Cleo Rebert <cleo.rebert@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+otpauth = "0.4.1"
+qrcode = "0.12.0"
+image = "0.23.3"
+base64 = "0.12.0"

README.md

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+# totp-rs
+
+This library is a cheap wrapper around otpauth, qrcode and image to seamlessly manage Time-based One-Time Password authentification
+
+## How to use
+
+Add this to your Cargo.toml
+```toml
+[dependencies.totp]
+git = "https://github.com/constantoine/totp-ts"
+```

src/lib.rs

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+//! This library is a cheap wrapper around otpauth, qrcode and image to seamlessly manage
+//! Time-based One-Time Password authentification
+
+use std::time::{SystemTime, UNIX_EPOCH};
+use otpauth::TOTP;
+
+use qrcode::QrCode;
+use image::Luma;
+use base64;
+
+/// Will check if provided code is valid with provided secret, with a tolerance of 15 seconds offest
+pub fn verify(code: u32, secret: String) -> bool {
+    let auth = TOTP::new(secret);
+    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs();
+    for i in 0..2 {
+        if auth.verify(code, 30, now - 15 + i * 15) {
+            return true;
+        }
+    }
+    false
+}
+
+/// Will return a qrcode to automatically add a TOTP as a base64 string
+pub fn get_qr(secret: String, mail: String) -> String {
+    let auth = TOTP::new(secret);
+    let code = QrCode::new(auth.to_uri(format!("account:{}@42l.fr", mail), "42l.fr".to_string())).unwrap();
+    let mut vec = Vec::new();
+    let encoder = image::png::PNGEncoder::new(&mut vec);
+    encoder.encode(&code.render::<Luma<u8>>().build().to_vec(), 360, 360, image::ColorType::L8).unwrap();
+    base64::encode(vec)
+}