use super::hashes::{BufferedHasher, Hasher};
use super::utils::{ch, k_value, maj, sigma_0, sigma_1, sum_0, sum_1};
use std::io::Read;
const BUFFER_SIZE_BITS: usize = 1024;
const BUFFER_SIZE_U8: usize = BUFFER_SIZE_BITS / 8;
const BUFFER_SIZE_U64: usize = BUFFER_SIZE_BITS / 64;
const MESSAGE_SCHEDULE_SIZE: usize = 80;
const HASH_SIZE_BITS: usize = 512;
const HASH_SIZE_U64: usize = HASH_SIZE_BITS / 64;
const LENGTH_VALUE_PADDING_SIZE_BITS: usize = 128;
const H: [u64; HASH_SIZE_U64] = [
0x6a09e667f3bcc908,
0xbb67ae8584caa73b,
0x3c6ef372fe94f82b,
0xa54ff53a5f1d36f1,
0x510e527fade682d1,
0x9b05688c2b3e6c1f,
0x1f83d9abfb41bd6b,
0x5be0cd19137e2179,
];
const K: [u64; MESSAGE_SCHEDULE_SIZE] = [
0x428a2f98d728ae22,
0x7137449123ef65cd,
0xb5c0fbcfec4d3b2f,
0xe9b5dba58189dbbc,
0x3956c25bf348b538,
0x59f111f1b605d019,
0x923f82a4af194f9b,
0xab1c5ed5da6d8118,
0xd807aa98a3030242,
0x12835b0145706fbe,
0x243185be4ee4b28c,
0x550c7dc3d5ffb4e2,
0x72be5d74f27b896f,
0x80deb1fe3b1696b1,
0x9bdc06a725c71235,
0xc19bf174cf692694,
0xe49b69c19ef14ad2,
0xefbe4786384f25e3,
0x0fc19dc68b8cd5b5,
0x240ca1cc77ac9c65,
0x2de92c6f592b0275,
0x4a7484aa6ea6e483,
0x5cb0a9dcbd41fbd4,
0x76f988da831153b5,
0x983e5152ee66dfab,
0xa831c66d2db43210,
0xb00327c898fb213f,
0xbf597fc7beef0ee4,
0xc6e00bf33da88fc2,
0xd5a79147930aa725,
0x06ca6351e003826f,
0x142929670a0e6e70,
0x27b70a8546d22ffc,
0x2e1b21385c26c926,
0x4d2c6dfc5ac42aed,
0x53380d139d95b3df,
0x650a73548baf63de,
0x766a0abb3c77b2a8,
0x81c2c92e47edaee6,
0x92722c851482353b,
0xa2bfe8a14cf10364,
0xa81a664bbc423001,
0xc24b8b70d0f89791,
0xc76c51a30654be30,
0xd192e819d6ef5218,
0xd69906245565a910,
0xf40e35855771202a,
0x106aa07032bbd1b8,
0x19a4c116b8d2d0c8,
0x1e376c085141ab53,
0x2748774cdf8eeb99,
0x34b0bcb5e19b48a8,
0x391c0cb3c5c95a63,
0x4ed8aa4ae3418acb,
0x5b9cca4f7763e373,
0x682e6ff3d6b2b8a3,
0x748f82ee5defb2fc,
0x78a5636f43172f60,
0x84c87814a1f0ab72,
0x8cc702081a6439ec,
0x90befffa23631e28,
0xa4506cebde82bde9,
0xbef9a3f7b2c67915,
0xc67178f2e372532b,
0xca273eceea26619c,
0xd186b8c721c0c207,
0xeada7dd6cde0eb1e,
0xf57d4f7fee6ed178,
0x06f067aa72176fba,
0x0a637dc5a2c898a6,
0x113f9804bef90dae,
0x1b710b35131c471b,
0x28db77f523047d84,
0x32caab7b40c72493,
0x3c9ebe0a15c9bebc,
0x431d67c49c100d4c,
0x4cc5d4becb3e42b6,
0x597f299cfc657e2a,
0x5fcb6fab3ad6faec,
0x6c44198c4a475817,
];
#[derive(Debug, Default)]
pub struct Sha512 {
data: Vec<u8>,
hashes: [u64; HASH_SIZE_U64],
chunk: [u64; BUFFER_SIZE_U64],
bytes_len: usize,
}
impl Sha512 {
fn compression(
w: &[u64; MESSAGE_SCHEDULE_SIZE],
(a, b, c, d, e, f, g, h): (
&mut u64,
&mut u64,
&mut u64,
&mut u64,
&mut u64,
&mut u64,
&mut u64,
&mut u64,
),
) {
for i in 0..MESSAGE_SCHEDULE_SIZE {
let sum_1 = sum_1(*e, (14, 18, 41));
let ch = ch(*e, *f, *g);
let temp_1 = h
.wrapping_add(sum_1)
.wrapping_add(ch)
.wrapping_add(K[i])
.wrapping_add(w[i]);
let sum_0 = sum_0(*a, (28, 34, 39));
let maj = maj(*a, *b, *c);
let temp_2 = sum_0.wrapping_add(maj);
*h = *g;
*g = *f;
*f = *e;
*e = d.wrapping_add(temp_1);
*d = *c;
*c = *b;
*b = *a;
*a = temp_1.wrapping_add(temp_2);
}
}
fn add_padding(temp_block_buf: &mut Vec<u8>, len: Option<usize>) {
let l = match len {
None => temp_block_buf.len() * 8,
Some(val) => val * 8,
};
temp_block_buf.push(0x80u8);
let k = k_value(l, Some(8), LENGTH_VALUE_PADDING_SIZE_BITS, BUFFER_SIZE_BITS) / 8;
let mut padding = vec![0; k];
temp_block_buf.append(&mut padding);
Self::copy_len_to_buf(temp_block_buf, l);
}
fn copy_buf_u8_to_u64(data: &[u8], block: &mut [u64; BUFFER_SIZE_U64], start: usize) {
assert!(
BUFFER_SIZE_U8 <= data.len() - start,
"Remaining bits in buffer are {val}, Expected {BUFFER_SIZE_U8} bits",
val = (data.len() - start)
);
for i in 0..BUFFER_SIZE_U64 {
block[i] = (data[start + (i * 8)] as u64) << 56
| (data[start + (i * 8) + 1] as u64) << 48
| (data[start + (i * 8) + 2] as u64) << 40
| (data[start + (i * 8) + 3] as u64) << 32
| (data[start + (i * 8) + 4] as u64) << 24
| (data[start + (i * 8) + 5] as u64) << 16
| (data[start + (i * 8) + 6] as u64) << 8
| data[start + (i * 8) + 7] as u64;
}
}
fn copy_len_to_buf(temp_block_buf: &mut Vec<u8>, len: usize) {
let len = len as u128;
temp_block_buf.push((len >> 120u128) as u8);
temp_block_buf.push((len >> 112u128) as u8);
temp_block_buf.push((len >> 104u128) as u8);
temp_block_buf.push((len >> 96u128) as u8);
temp_block_buf.push((len >> 88u128) as u8);
temp_block_buf.push((len >> 80u128) as u8);
temp_block_buf.push((len >> 72u128) as u8);
temp_block_buf.push((len >> 64u128) as u8);
temp_block_buf.push((len >> 56u128) as u8);
temp_block_buf.push((len >> 48u128) as u8);
temp_block_buf.push((len >> 40u128) as u8);
temp_block_buf.push((len >> 32u128) as u8);
temp_block_buf.push((len >> 24u128) as u8);
temp_block_buf.push((len >> 16u128) as u8);
temp_block_buf.push((len >> 8u128) as u8);
temp_block_buf.push(len as u8);
}
fn hash_algo(&mut self) {
let mut w = [0; MESSAGE_SCHEDULE_SIZE];
w[0..16].copy_from_slice(&self.chunk[..]);
for i in 16..MESSAGE_SCHEDULE_SIZE {
let sigma_0 = sigma_0(w[i - 15], (1, 8, 7));
let sigma_1 = sigma_1(w[i - 2], (19, 61, 6));
w[i] = sigma_0
.wrapping_add(sigma_1)
.wrapping_add(w[i - 16])
.wrapping_add(w[i - 7]);
}
let [mut a, mut b, mut c, mut d, mut e, mut f, mut g, mut h] = self.hashes;
Self::compression(
&w,
(
&mut a, &mut b, &mut c, &mut d, &mut e, &mut f, &mut g, &mut h,
),
);
self.hashes[0] = a.wrapping_add(self.hashes[0]);
self.hashes[1] = b.wrapping_add(self.hashes[1]);
self.hashes[2] = c.wrapping_add(self.hashes[2]);
self.hashes[3] = d.wrapping_add(self.hashes[3]);
self.hashes[4] = e.wrapping_add(self.hashes[4]);
self.hashes[5] = f.wrapping_add(self.hashes[5]);
self.hashes[6] = g.wrapping_add(self.hashes[6]);
self.hashes[7] = h.wrapping_add(self.hashes[7]);
}
fn get_hash_string(&self) -> String {
format!(
"{:016x}{:016x}{:016x}{:016x}{:016x}{:016x}{:016x}{:016x}",
self.hashes[0],
self.hashes[1],
self.hashes[2],
self.hashes[3],
self.hashes[4],
self.hashes[5],
self.hashes[6],
self.hashes[7]
)
}
}
impl BufferedHasher for Sha512 {
fn new() -> Self {
Self {
data: Vec::new(),
hashes: H,
chunk: [0; BUFFER_SIZE_U64],
bytes_len: 0,
}
}
fn consumed_len(&self) -> usize {
self.bytes_len
}
fn hash_bufferd(&mut self, handle: &mut dyn Read) -> String {
let mut buffer = [0; BUFFER_SIZE_U8];
while let Ok(n) = handle.read(&mut buffer) {
self.bytes_len += n;
if n == 0 {
break;
} else if n == BUFFER_SIZE_U8 {
Self::copy_buf_u8_to_u64(&buffer, &mut self.chunk, 0);
self.hash_algo();
} else {
let mut data = Vec::new();
for d in &buffer[..n] {
data.push(*d);
}
Self::add_padding(&mut data, Some(self.bytes_len));
for i in (0..data.len()).step_by(BUFFER_SIZE_U8) {
Self::copy_buf_u8_to_u64(&data, &mut self.chunk, i);
self.hash_algo();
}
}
}
self.get_hash_string()
}
}
impl Hasher for Sha512 {
fn new() -> Self {
Self {
data: Vec::new(),
hashes: H,
chunk: [0; BUFFER_SIZE_U64],
bytes_len: 0,
}
}
fn consumed_len(&self) -> usize {
self.data.len()
}
fn digest(&mut self, data: &[u8]) {
for byte in data {
self.data.push(*byte);
}
}
fn finish(&mut self) -> String {
Self::add_padding(&mut self.data, None);
for i in (0..self.data.len()).step_by(BUFFER_SIZE_U8) {
Self::copy_buf_u8_to_u64(&self.data, &mut self.chunk, i);
self.hash_algo();
}
self.get_hash_string()
}
}