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90d3e4b4e9
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41efcce00f
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@ -1,3 +1 @@
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/target
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Cargo.lock
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@ -12,6 +12,3 @@ binascii = { version = "0.1", default-features = false, features = ["decode"] }
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[profile.release]
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lto = true
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panic = "abort"
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strip = true
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opt-level = "z"
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codegen-units = 1
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1
build.sh
1
build.sh
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@ -1 +1,2 @@
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cargo build -Z build-std=core --target avr-atmega328p.json --release
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avr-objcopy -O ihex -R .eeprom target/avr-atmega328p/release/rustytoken.elf rustytoken.hex
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File diff suppressed because it is too large
Load Diff
100
src/main.rs
100
src/main.rs
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@ -1,27 +1,23 @@
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#![no_std]
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#![no_main]
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// #![no_std]
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// #![no_main]
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mod crypto;
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use arduino_hal::hal::usart::BaudrateArduinoExt;
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use arduino_hal::prelude::*;
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use arduino_hal::{delay_ms, Usart};
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use binascii::b32decode;
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use crypto::hmac_sha1;
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use std::time::{Duration, SystemTime, UNIX_EPOCH};
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use panic_halt as _;
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// use panic_halt as _;
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const INTERVAL: u64 = 30;
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const SECRET_KEY_MAX_LEN: u8 = 32;
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fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
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// RFC 6238 Doesn't specify a max length for the secret keys, So I chose 32
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// You can change the max length by modifying the const
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let mut result = [0u8; SECRET_KEY_MAX_LEN];
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let mut result = [0u8; 32];
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let mut inc = 0;
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let offset = match 8 - (secret.len() % 8) {
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8 => 0,
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n => n,
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};
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let offset = 8 - (secret.len() % 8);
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for c in secret.chars() {
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result[inc] = c.to_ascii_uppercase() as u8;
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@ -34,63 +30,73 @@ fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
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let decoded = match binascii::b32decode(&result[..inc], output).ok() {
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Some(bytes) => bytes,
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None => "".as_bytes(), // TODO: Implement a way to display errors
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None => "".as_bytes(),
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};
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decoded.len()
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}
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fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
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let mut output = [0u8; 50];
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fn generate_otp_token(private_key: &str, actual_time: u64) -> u64 {
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let mut output = [0u8; 200];
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let private_key_len = process_secret(private_key, &mut output);
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let interval = actual_time / INTERVAL;
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let msg = interval.to_be_bytes();
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println!("key:\n{private_key:?}");
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println!("msg:\n{msg:?}");
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let mut hmac_digest = [0u8; 20];
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hmac_sha1(&output[..private_key_len], &msg, &mut hmac_digest);
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println!("{:?}", hmac_digest);
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let start = (hmac_digest[19] & 0xF) as usize;
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println!("Start before process: {}", hmac_digest[19]);
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println!("start: {start}");
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let bytes: [u8; 4] = hmac_digest[start..start + 4].try_into().unwrap();
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println!("bytes: {bytes:?}");
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let raw_token = u32::from_be_bytes(bytes);
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((raw_token & 0x7F_FF_FF_FF) % 1_000_000) as u32
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println!("raw token: {raw_token}");
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((raw_token & 0x7F_FF_FF_FF) % 1_000_000) as u64
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}
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fn token_to_bytes(mut token: u32, output: &mut [u8]) {
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let mut inc = 0;
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while token > 0 {
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output[inc] = (token % 10) as u8 + b'0';
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token /= 10;
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inc += 1;
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}
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output.reverse()
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}
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fn main() {
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// let now = SystemTime::now();
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// let elapsed = now.duration_since(UNIX_EPOCH).unwrap();
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// let seconds = elapsed.as_secs();
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// println!("seconds: {seconds}");
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#[arduino_hal::entry]
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fn main() -> ! {
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let dp = arduino_hal::Peripherals::take().unwrap();
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let pins = arduino_hal::pins!(dp);
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// let otp_token = generate_otp_token("holaaaaamundo", seconds);
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let mut led = pins.d13.into_output();
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let mut serial = Usart::new(
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dp.USART0,
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pins.d0,
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pins.d1.into_output(),
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BaudrateArduinoExt::into_baudrate(9600),
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);
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// let token = generate_otp_token("holaaaaamundo", 1680155315);
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let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
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let mut output = [0u8; 6];
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token_to_bytes(token, &mut output);
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for b in output {
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serial.write_byte(b);
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}
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serial.write_byte('\n' as u8);
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// println!("{:06}", otp_token);
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// std::thread::sleep(Duration::from_secs(1));
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loop {
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led.toggle();
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delay_ms(1000);
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let now = SystemTime::now();
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let elapsed = now.duration_since(UNIX_EPOCH).unwrap();
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let seconds = elapsed.as_secs();
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let otp_token = generate_otp_token("holaaaaamundo", seconds);
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println!("{:06}", otp_token);
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std::thread::sleep(Duration::from_secs(1));
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}
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}
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// #[arduino_hal::entry]
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// fn main() -> ! {
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// let dp = arduino_hal::Peripherals::take().unwrap();
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// let pins = arduino_hal::pins!(dp);
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//
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// let mut led = pins.d13.into_output();
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// let mut serial = Usart::new(
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// dp.USART0,
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// pins.d0,
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// pins.d1.into_output(),
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// BaudrateArduinoExt::into_baudrate(9600),
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// );
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//
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// loop {
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// led.toggle();
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// delay_ms(1000);
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// }
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// }
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