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// Copyright 2017 Guanhao Yin <sopium@mysterious.site>
// This file is part of WireGuard.rs.
// WireGuard.rs is free software: you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
// WireGuard.rs is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with WireGuard.rs. If not, see <https://www.gnu.org/licenses/>.
// Ported from the libsodium.
extern crate byteorder;
use self::byteorder::{ByteOrder, LittleEndian};
macro_rules! rotate {
($v:expr, $c:expr) => (($v << $c) | ($v >> (32 - $c)))
}
macro_rules! quarter_round {
($a:ident, $b:ident, $c:ident, $d:ident) => {
$a = $a.wrapping_add($b);
$d = rotate!($d ^ $a, 16);
$c = $c.wrapping_add($d);
$b = rotate!($b ^ $c, 12);
$a = $a.wrapping_add($b);
$d = rotate!($d ^ $a, 8);
$c = $c.wrapping_add($d);
$b = rotate!($b ^ $c, 7);
}
}
/// The `hchacha20` primitive, same as libsodium.
pub fn hchacha20(input: &[u8], key: &[u8]) -> [u8; 32] {
// It's a bit difficult to work with &[u8; 16], &[u8; 32], etc. So just use slices, and assert
// their lengths.
assert_eq!(input.len(), 16);
assert_eq!(key.len(), 32);
let mut x0 = 0x61707865u32;
let mut x1 = 0x3320646eu32;
let mut x2 = 0x79622d32u32;
let mut x3 = 0x6b206574u32;
let mut x4 = LittleEndian::read_u32(&key[0..4]);
let mut x5 = LittleEndian::read_u32(&key[4..8]);
let mut x6 = LittleEndian::read_u32(&key[8..12]);
let mut x7 = LittleEndian::read_u32(&key[12..16]);
let mut x8 = LittleEndian::read_u32(&key[16..20]);
let mut x9 = LittleEndian::read_u32(&key[20..24]);
let mut x10 = LittleEndian::read_u32(&key[24..28]);
let mut x11 = LittleEndian::read_u32(&key[28..32]);
let mut x12 = LittleEndian::read_u32(&input[0..4]);
let mut x13 = LittleEndian::read_u32(&input[4..8]);
let mut x14 = LittleEndian::read_u32(&input[8..12]);
let mut x15 = LittleEndian::read_u32(&input[12..16]);
for _ in 0..10 {
quarter_round!(x0, x4, x8, x12);
quarter_round!(x1, x5, x9, x13);
quarter_round!(x2, x6, x10, x14);
quarter_round!(x3, x7, x11, x15);
quarter_round!(x0, x5, x10, x15);
quarter_round!(x1, x6, x11, x12);
quarter_round!(x2, x7, x8, x13);
quarter_round!(x3, x4, x9, x14);
}
let mut out = [0u8; 32];
LittleEndian::write_u32(&mut out[0..4], x0);
LittleEndian::write_u32(&mut out[4..8], x1);
LittleEndian::write_u32(&mut out[8..12], x2);
LittleEndian::write_u32(&mut out[12..16], x3);
LittleEndian::write_u32(&mut out[16..20], x12);
LittleEndian::write_u32(&mut out[20..24], x13);
LittleEndian::write_u32(&mut out[24..28], x14);
LittleEndian::write_u32(&mut out[28..32], x15);
out
}
#[cfg(test)]
mod tests {
extern crate rustc_serialize;
use self::rustc_serialize::hex::FromHex;
#[test]
fn hchacha20_vectors() {
// From libsodium.
// [[key, in, out]]
let vec = [["24f11cce8a1b3d61e441561a696c1c1b7e173d084fd4812425435a8896a013dc",
"d9660c5900ae19ddad28d6e06e45fe5e",
"5966b3eec3bff1189f831f06afe4d4e3be97fa9235ec8c20d08acfbbb4e851e3"],
["80a5f6272031e18bb9bcd84f3385da65e7731b7039f13f5e3d475364cd4d42f7",
"c0eccc384b44c88e92c57eb2d5ca4dfa",
"6ed11741f724009a640a44fce7320954c46e18e0d7ae063bdbc8d7cf372709df"],
["cb1fc686c0eec11a89438b6f4013bf110e7171dace3297f3a657a309b3199629",
"fcd49b93e5f8f299227e64d40dc864a3",
"84b7e96937a1a0a406bb7162eeaad34308d49de60fd2f7ec9dc6a79cbab2ca34"],
["6640f4d80af5496ca1bc2cfff1fefbe99638dbceaabd7d0ade118999d45f053d",
"31f59ceeeafdbfe8cae7914caeba90d6",
"9af4697d2f5574a44834a2c2ae1a0505af9f5d869dbe381a994a18eb374c36a0"],
["0693ff36d971225a44ac92c092c60b399e672e4cc5aafd5e31426f123787ac27",
"3a6293da061da405db45be1731d5fc4d",
"f87b38609142c01095bfc425573bb3c698f9ae866b7e4216840b9c4caf3b0865"],
["809539bd2639a23bf83578700f055f313561c7785a4a19fc9114086915eee551",
"780c65d6a3318e479c02141d3f0b3918",
"902ea8ce4680c09395ce71874d242f84274243a156938aaa2dd37ac5be382b42"],
["1a170ddf25a4fd69b648926e6d794e73408805835c64b2c70efddd8cd1c56ce0",
"05dbee10de87eb0c5acb2b66ebbe67d3",
"a4e20b634c77d7db908d387b48ec2b370059db916e8ea7716dc07238532d5981"],
["3b354e4bb69b5b4a1126f509e84cad49f18c9f5f29f0be0c821316a6986e15a6",
"d8a89af02f4b8b2901d8321796388b6c",
"9816cb1a5b61993735a4b161b51ed2265b696e7ded5309c229a5a99f53534fbc"],
["4b9a818892e15a530db50dd2832e95ee192e5ed6afffb408bd624a0c4e12a081",
"a9079c551de70501be0286d1bc78b045",
"ebc5224cf41ea97473683b6c2f38a084bf6e1feaaeff62676db59d5b719d999b"],
["c49758f00003714c38f1d4972bde57ee8271f543b91e07ebce56b554eb7fa6a7",
"31f0204e10cf4f2035f9e62bb5ba7303",
"0dd8cc400f702d2c06ed920be52048a287076b86480ae273c6d568a2e9e7518c"]];
for v in &vec {
let key = v[0].from_hex().unwrap();
let input = v[1].from_hex().unwrap();
let expected = v[2].from_hex().unwrap();
let out = super::hchacha20(input.as_slice(), key.as_slice());
assert_eq!(&expected, &out);
}
}
}
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