use crate::constants::{CRYPTO_SHORTHASH_SIPHASH24_BYTES, CRYPTO_SHORTHASH_SIPHASH24_KEYBYTES};
use crate::utils::load_u64_le;
pub(crate) type Hash = [u8; CRYPTO_SHORTHASH_SIPHASH24_BYTES];
pub(crate) type Key = [u8; CRYPTO_SHORTHASH_SIPHASH24_KEYBYTES];
fn rotl64(x: u64, b: u64) -> u64 {
(x << b) | (x >> (64 - b))
}
pub(crate) fn siphash24(output: &mut Hash, input: &[u8], key: &Key) {
let mut v0 = 0x736f6d6570736575u64;
let mut v1 = 0x646f72616e646f6du64;
let mut v2 = 0x6c7967656e657261u64;
let mut v3 = 0x7465646279746573u64;
let k0 = load_u64_le(&key[..8]);
let k1 = load_u64_le(&key[8..]);
v3 ^= k1;
v2 ^= k0;
v1 ^= k1;
v0 ^= k0;
let round = |v0: &mut u64, v1: &mut u64, v2: &mut u64, v3: &mut u64| {
*v0 = v0.wrapping_add(*v1);
*v1 = rotl64(*v1, 13);
*v1 ^= *v0;
*v0 = rotl64(*v0, 32);
*v2 = v2.wrapping_add(*v3);
*v3 = rotl64(*v3, 16);
*v3 ^= *v2;
*v0 = v0.wrapping_add(*v3);
*v3 = rotl64(*v3, 21);
*v3 ^= *v0;
*v2 = v2.wrapping_add(*v1);
*v1 = rotl64(*v1, 17);
*v1 ^= *v2;
*v2 = rotl64(*v2, 32);
};
for chunk in input.chunks_exact(8) {
let m = load_u64_le(chunk);
v3 ^= m;
round(&mut v0, &mut v1, &mut v2, &mut v3);
round(&mut v0, &mut v1, &mut v2, &mut v3);
v0 ^= m;
}
let mut b = (input.len() as u64) << 56;
let remainder = input.chunks_exact(8).remainder();
for i in (0..remainder.len()).rev() {
b |= (remainder[i] as u64) << (i * 8);
}
v3 ^= b;
round(&mut v0, &mut v1, &mut v2, &mut v3);
round(&mut v0, &mut v1, &mut v2, &mut v3);
v0 ^= b;
v2 ^= 0xff;
round(&mut v0, &mut v1, &mut v2, &mut v3);
round(&mut v0, &mut v1, &mut v2, &mut v3);
round(&mut v0, &mut v1, &mut v2, &mut v3);
round(&mut v0, &mut v1, &mut v2, &mut v3);
b = v0 ^ v1 ^ v2 ^ v3;
output.copy_from_slice(&b.to_le_bytes());
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_siphash24() {
let vectors: [[u8; 8]; 64] = [
[0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72],
[0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74],
[0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d],
[0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85],
[0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf],
[0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18],
[0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb],
[0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab],
[0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93],
[0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e],
[0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a],
[0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4],
[0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75],
[0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14],
[0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7],
[0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1],
[0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f],
[0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69],
[0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b],
[0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb],
[0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe],
[0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0],
[0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93],
[0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8],
[0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8],
[0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc],
[0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17],
[0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f],
[0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde],
[0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6],
[0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad],
[0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32],
[0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71],
[0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7],
[0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12],
[0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15],
[0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31],
[0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02],
[0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca],
[0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a],
[0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e],
[0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad],
[0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18],
[0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4],
[0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9],
[0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9],
[0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb],
[0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0],
[0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6],
[0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7],
[0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee],
[0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1],
[0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a],
[0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81],
[0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f],
[0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24],
[0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7],
[0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea],
[0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60],
[0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66],
[0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c],
[0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f],
[0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5],
[0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95],
];
let mut key = Key::default();
for (i, item) in key.iter_mut().enumerate() {
*item = i as u8;
}
for (i, item) in vectors.iter().enumerate() {
let mut input = vec![0u8; i];
for (j, item) in input.iter_mut().enumerate().take(i) {
*item = j as u8;
}
let mut output = Hash::default();
siphash24(&mut output, &input, &key);
assert_eq!(output, *item);
}
}
}