lnsocket 0.5.2

An async lightning network socket with with core-lightning rpc support
Documentation 
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// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
// You may not use this file except in accordance with one or both of these
// licenses.

// This is a port of Andrew Moons poly1305-donna
// https://github.com/floodyberry/poly1305-donna

use core::cmp::min;

use crate::prelude::*;

#[derive(Clone, Copy)]
pub struct Poly1305 {
    r: [u32; 5],
    h: [u32; 5],
    pad: [u32; 4],
    leftover: usize,
    buffer: [u8; 16],
    finalized: bool,
}

impl Poly1305 {
    pub fn new(key: &[u8]) -> Poly1305 {
        assert!(key.len() == 32);
        let mut poly = Poly1305 {
            r: [0u32; 5],
            h: [0u32; 5],
            pad: [0u32; 4],
            leftover: 0,
            buffer: [0u8; 16],
            finalized: false,
        };

        // r &= 0xffffffc0ffffffc0ffffffc0fffffff
        poly.r[0] = (u32::from_le_bytes(key[0..4].try_into().expect("len is 4"))) & 0x3ffffff;
        poly.r[1] = (u32::from_le_bytes(key[3..7].try_into().expect("len is 4")) >> 2) & 0x3ffff03;
        poly.r[2] = (u32::from_le_bytes(key[6..10].try_into().expect("len is 4")) >> 4) & 0x3ffc0ff;
        poly.r[3] = (u32::from_le_bytes(key[9..13].try_into().expect("len is 4")) >> 6) & 0x3f03fff;
        poly.r[4] =
            (u32::from_le_bytes(key[12..16].try_into().expect("len is 4")) >> 8) & 0x00fffff;

        poly.pad[0] = u32::from_le_bytes(key[16..20].try_into().expect("len is 4"));
        poly.pad[1] = u32::from_le_bytes(key[20..24].try_into().expect("len is 4"));
        poly.pad[2] = u32::from_le_bytes(key[24..28].try_into().expect("len is 4"));
        poly.pad[3] = u32::from_le_bytes(key[28..32].try_into().expect("len is 4"));

        poly
    }

    fn block(&mut self, m: &[u8]) {
        let hibit: u32 = if self.finalized { 0 } else { 1 << 24 };

        let r0 = self.r[0];
        let r1 = self.r[1];
        let r2 = self.r[2];
        let r3 = self.r[3];
        let r4 = self.r[4];

        let s1 = r1 * 5;
        let s2 = r2 * 5;
        let s3 = r3 * 5;
        let s4 = r4 * 5;

        let mut h0 = self.h[0];
        let mut h1 = self.h[1];
        let mut h2 = self.h[2];
        let mut h3 = self.h[3];
        let mut h4 = self.h[4];

        // h += m
        h0 += (u32::from_le_bytes(m[0..4].try_into().expect("len is 4"))) & 0x3ffffff;
        h1 += (u32::from_le_bytes(m[3..7].try_into().expect("len is 4")) >> 2) & 0x3ffffff;
        h2 += (u32::from_le_bytes(m[6..10].try_into().expect("len is 4")) >> 4) & 0x3ffffff;
        h3 += (u32::from_le_bytes(m[9..13].try_into().expect("len is 4")) >> 6) & 0x3ffffff;
        h4 += (u32::from_le_bytes(m[12..16].try_into().expect("len is 4")) >> 8) | hibit;

        // h *= r
        let d0 = (h0 as u64 * r0 as u64)
            + (h1 as u64 * s4 as u64)
            + (h2 as u64 * s3 as u64)
            + (h3 as u64 * s2 as u64)
            + (h4 as u64 * s1 as u64);
        let mut d1 = (h0 as u64 * r1 as u64)
            + (h1 as u64 * r0 as u64)
            + (h2 as u64 * s4 as u64)
            + (h3 as u64 * s3 as u64)
            + (h4 as u64 * s2 as u64);
        let mut d2 = (h0 as u64 * r2 as u64)
            + (h1 as u64 * r1 as u64)
            + (h2 as u64 * r0 as u64)
            + (h3 as u64 * s4 as u64)
            + (h4 as u64 * s3 as u64);
        let mut d3 = (h0 as u64 * r3 as u64)
            + (h1 as u64 * r2 as u64)
            + (h2 as u64 * r1 as u64)
            + (h3 as u64 * r0 as u64)
            + (h4 as u64 * s4 as u64);
        let mut d4 = (h0 as u64 * r4 as u64)
            + (h1 as u64 * r3 as u64)
            + (h2 as u64 * r2 as u64)
            + (h3 as u64 * r1 as u64)
            + (h4 as u64 * r0 as u64);

        // (partial) h %= p
        let mut c: u32;
        c = (d0 >> 26) as u32;
        h0 = d0 as u32 & 0x3ffffff;
        d1 += c as u64;
        c = (d1 >> 26) as u32;
        h1 = d1 as u32 & 0x3ffffff;
        d2 += c as u64;
        c = (d2 >> 26) as u32;
        h2 = d2 as u32 & 0x3ffffff;
        d3 += c as u64;
        c = (d3 >> 26) as u32;
        h3 = d3 as u32 & 0x3ffffff;
        d4 += c as u64;
        c = (d4 >> 26) as u32;
        h4 = d4 as u32 & 0x3ffffff;
        h0 += c * 5;
        c = h0 >> 26;
        h0 &= 0x3ffffff;
        h1 += c;

        self.h[0] = h0;
        self.h[1] = h1;
        self.h[2] = h2;
        self.h[3] = h3;
        self.h[4] = h4;
    }

    pub fn finish(&mut self) {
        if self.leftover > 0 {
            self.buffer[self.leftover] = 1;
            for i in self.leftover + 1..16 {
                self.buffer[i] = 0;
            }
            self.finalized = true;
            let tmp = self.buffer;
            self.block(&tmp);
        }

        // fully carry h
        let mut h0 = self.h[0];
        let mut h1 = self.h[1];
        let mut h2 = self.h[2];
        let mut h3 = self.h[3];
        let mut h4 = self.h[4];

        let mut c: u32;
        c = h1 >> 26;
        h1 &= 0x3ffffff;
        h2 += c;
        c = h2 >> 26;
        h2 &= 0x3ffffff;
        h3 += c;
        c = h3 >> 26;
        h3 &= 0x3ffffff;
        h4 += c;
        c = h4 >> 26;
        h4 &= 0x3ffffff;
        h0 += c * 5;
        c = h0 >> 26;
        h0 &= 0x3ffffff;
        h1 += c;

        // compute h + -p
        let mut g0 = h0.wrapping_add(5);
        c = g0 >> 26;
        g0 &= 0x3ffffff;
        let mut g1 = h1.wrapping_add(c);
        c = g1 >> 26;
        g1 &= 0x3ffffff;
        let mut g2 = h2.wrapping_add(c);
        c = g2 >> 26;
        g2 &= 0x3ffffff;
        let mut g3 = h3.wrapping_add(c);
        c = g3 >> 26;
        g3 &= 0x3ffffff;
        let mut g4 = h4.wrapping_add(c).wrapping_sub(1 << 26);

        // select h if h < p, or h + -p if h >= p
        let mut mask = (g4 >> (32 - 1)).wrapping_sub(1);
        g0 &= mask;
        g1 &= mask;
        g2 &= mask;
        g3 &= mask;
        g4 &= mask;
        mask = !mask;
        h0 = (h0 & mask) | g0;
        h1 = (h1 & mask) | g1;
        h2 = (h2 & mask) | g2;
        h3 = (h3 & mask) | g3;
        h4 = (h4 & mask) | g4;

        // h = h % (2^128)
        h0 |= h1 << 26;
        h1 = (h1 >> 6) | (h2 << 20);
        h2 = (h2 >> 12) | (h3 << 14);
        h3 = (h3 >> 18) | (h4 << 8);

        // h = mac = (h + pad) % (2^128)
        let mut f: u64;
        f = h0 as u64 + self.pad[0] as u64;
        h0 = f as u32;
        f = h1 as u64 + self.pad[1] as u64 + (f >> 32);
        h1 = f as u32;
        f = h2 as u64 + self.pad[2] as u64 + (f >> 32);
        h2 = f as u32;
        f = h3 as u64 + self.pad[3] as u64 + (f >> 32);
        h3 = f as u32;

        self.h[0] = h0;
        self.h[1] = h1;
        self.h[2] = h2;
        self.h[3] = h3;
    }

    pub fn input(&mut self, data: &[u8]) {
        assert!(!self.finalized);
        let mut m = data;

        if self.leftover > 0 {
            let want = min(16 - self.leftover, m.len());
            for (i, item) in m.iter().enumerate().take(want) {
                self.buffer[self.leftover + i] = *item;
            }
            m = &m[want..];
            self.leftover += want;

            if self.leftover < 16 {
                return;
            }

            // self.block(self.buffer[..]);
            let tmp = self.buffer;
            self.block(&tmp);

            self.leftover = 0;
        }

        while m.len() >= 16 {
            self.block(&m[0..16]);
            m = &m[16..];
        }

        self.buffer[..m.len()].copy_from_slice(m);
        self.leftover = m.len();
    }

    pub fn raw_result(&mut self, output: &mut [u8]) {
        assert!(output.len() >= 16);
        if !self.finalized {
            self.finish();
        }
        output[0..4].copy_from_slice(&self.h[0].to_le_bytes());
        output[4..8].copy_from_slice(&self.h[1].to_le_bytes());
        output[8..12].copy_from_slice(&self.h[2].to_le_bytes());
        output[12..16].copy_from_slice(&self.h[3].to_le_bytes());
    }
}

#[cfg(test)]
mod test {
    use core::iter::repeat;

    use super::Poly1305;

    fn poly1305(key: &[u8], msg: &[u8], mac: &mut [u8]) {
        let mut poly = Poly1305::new(key);
        poly.input(msg);
        poly.raw_result(mac);
    }

    #[test]
    fn test_nacl_vector() {
        let key = [
            0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91, 0x6d, 0x11, 0xc2, 0xcb, 0x21, 0x4d,
            0x3c, 0x25, 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23, 0x4e, 0x65, 0x2d, 0x65, 0x1f, 0xa4,
            0xc8, 0xcf, 0xf8, 0x80,
        ];

        let msg = [
            0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, 0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc,
            0x76, 0xce, 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4, 0x47, 0x6f, 0xb8, 0xc5,
            0x31, 0xa1, 0x18, 0x6a, 0xc0, 0xdf, 0xc1, 0x7c, 0x98, 0xdc, 0xe8, 0x7b, 0x4d, 0xa7,
            0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72, 0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2,
            0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38, 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7,
            0xcc, 0x8a, 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, 0x90, 0x22, 0x43, 0x68,
            0x51, 0x7a, 0xcf, 0xea, 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda, 0x99, 0x83,
            0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde, 0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3,
            0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6, 0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4,
            0x5a, 0x74, 0xe3, 0x55, 0xa5,
        ];

        let expected = [
            0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5, 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33,
            0x05, 0xd9,
        ];

        let mut mac = [0u8; 16];
        poly1305(&key, &msg, &mut mac);
        assert_eq!(&mac[..], &expected[..]);

        let mut poly = Poly1305::new(&key);
        poly.input(&msg[0..32]);
        poly.input(&msg[32..96]);
        poly.input(&msg[96..112]);
        poly.input(&msg[112..120]);
        poly.input(&msg[120..124]);
        poly.input(&msg[124..126]);
        poly.input(&msg[126..127]);
        poly.input(&msg[127..128]);
        poly.input(&msg[128..129]);
        poly.input(&msg[129..130]);
        poly.input(&msg[130..131]);
        poly.raw_result(&mut mac);
        assert_eq!(&mac[..], &expected[..]);
    }

    #[test]
    fn donna_self_test() {
        let wrap_key = [
            0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
        ];

        let wrap_msg = [
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff,
        ];

        let wrap_mac = [
            0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00,
        ];

        let mut mac = [0u8; 16];
        poly1305(&wrap_key, &wrap_msg, &mut mac);
        assert_eq!(&mac[..], &wrap_mac[..]);

        let total_key = [
            0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0x00, 0x00, 0x00, 0x00,
        ];

        let total_mac = [
            0x64, 0xaf, 0xe2, 0xe8, 0xd6, 0xad, 0x7b, 0xbd, 0xd2, 0x87, 0xf9, 0x7c, 0x44, 0x62,
            0x3d, 0x39,
        ];

        let mut tpoly = Poly1305::new(&total_key);
        for i in 0..256 {
            let key: Vec<u8> = repeat(i as u8).take(32).collect();
            let msg: Vec<u8> = repeat(i as u8).take(256).collect();
            let mut mac = [0u8; 16];
            poly1305(&key[..], &msg[0..i], &mut mac);
            tpoly.input(&mac);
        }
        tpoly.raw_result(&mut mac);
        assert_eq!(&mac[..], &total_mac[..]);
    }

    #[test]
    fn test_tls_vectors() {
        // from http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04
        let key = b"this is 32-byte key for Poly1305";
        let msg = [0u8; 32];
        let expected = [
            0x49, 0xec, 0x78, 0x09, 0x0e, 0x48, 0x1e, 0xc6, 0xc2, 0x6b, 0x33, 0xb9, 0x1c, 0xcc,
            0x03, 0x07,
        ];
        let mut mac = [0u8; 16];
        poly1305(key, &msg, &mut mac);
        assert_eq!(&mac[..], &expected[..]);

        let msg = b"Hello world!";
        let expected = [
            0xa6, 0xf7, 0x45, 0x00, 0x8f, 0x81, 0xc9, 0x16, 0xa2, 0x0d, 0xcc, 0x74, 0xee, 0xf2,
            0xb2, 0xf0,
        ];
        poly1305(key, msg, &mut mac);
        assert_eq!(&mac[..], &expected[..]);
    }
}