use core::convert::TryInto;
pub struct Sha256Ctx {
h: [u32; 8],
len_bits: u64,
buf: [u8; 64],
buf_len: usize,
}
const SHA256_K: [u32; 64] = [
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
];
fn rotr32(x: u32, n: u32) -> u32 { (x >> n) | (x << (32 - n)) }
fn read_be_u32(block: &[u8], off: usize) -> u32 {
u32::from_be_bytes([block[off], block[off + 1], block[off + 2], block[off + 3]])
}
impl Sha256Ctx {
pub fn new() -> Self {
Sha256Ctx {
h: [
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19,
],
len_bits: 0,
buf: [0u8; 64],
buf_len: 0,
}
}
fn compress(&mut self, block: &[u8; 64]) {
let mut w = [0u32; 64];
for (t, wslot) in w.iter_mut().enumerate().take(16) {
let off = t * 4;
*wslot = read_be_u32(block, off);
}
for t in 16..64 {
let s0 = rotr32(w[t-15], 7) ^ rotr32(w[t-15], 18) ^ (w[t-15] >> 3);
let s1 = rotr32(w[t-2], 17) ^ rotr32(w[t-2], 19) ^ (w[t-2] >> 10);
w[t] = w[t-16].wrapping_add(s0).wrapping_add(w[t-7]).wrapping_add(s1);
}
let mut a = self.h[0];
let mut b = self.h[1];
let mut c = self.h[2];
let mut d = self.h[3];
let mut e = self.h[4];
let mut f = self.h[5];
let mut g = self.h[6];
let mut h = self.h[7];
for t in 0..64 {
let s1 = rotr32(e, 6) ^ rotr32(e, 11) ^ rotr32(e, 25);
let ch = (e & f) ^ ((!e) & g);
let temp1 = h.wrapping_add(s1).wrapping_add(ch).wrapping_add(SHA256_K[t]).wrapping_add(w[t]);
let s0 = rotr32(a, 2) ^ rotr32(a, 13) ^ rotr32(a, 22);
let maj = (a & b) ^ (a & c) ^ (b & c);
let temp2 = s0.wrapping_add(maj);
h = g;
g = f;
f = e;
e = d.wrapping_add(temp1);
d = c;
c = b;
b = a;
a = temp1.wrapping_add(temp2);
}
self.h[0] = self.h[0].wrapping_add(a);
self.h[1] = self.h[1].wrapping_add(b);
self.h[2] = self.h[2].wrapping_add(c);
self.h[3] = self.h[3].wrapping_add(d);
self.h[4] = self.h[4].wrapping_add(e);
self.h[5] = self.h[5].wrapping_add(f);
self.h[6] = self.h[6].wrapping_add(g);
self.h[7] = self.h[7].wrapping_add(h);
}
pub fn update(&mut self, mut data: &[u8]) {
self.len_bits = self.len_bits.wrapping_add((data.len() as u64) << 3);
if self.buf_len > 0 {
let need = 64 - self.buf_len;
if data.len() >= need {
self.buf[self.buf_len..].copy_from_slice(&data[..need]);
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
data = &data[need..];
} else {
self.buf[self.buf_len..self.buf_len + data.len()].copy_from_slice(data);
self.buf_len += data.len();
return;
}
}
while data.len() >= 64 {
let block: &[u8;64] = match data[..64].try_into() { Ok(b) => b, Err(_) => unreachable!() };
self.compress(block);
data = &data[64..];
}
if !data.is_empty() {
self.buf[..data.len()].copy_from_slice(data);
self.buf_len = data.len();
}
}
pub fn finalize(&mut self, out: &mut [u8;32]) {
let msg_len_bits = self.len_bits;
self.buf[self.buf_len] = 0x80;
self.buf_len += 1;
if self.buf_len > 56 {
for b in &mut self.buf[self.buf_len..64] {
*b = 0;
}
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
}
for b in &mut self.buf[self.buf_len..56] {
*b = 0;
}
self.buf[56..64].copy_from_slice(&msg_len_bits.to_be_bytes());
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
for (i, v) in self.h.iter().enumerate() {
let bytes = v.to_be_bytes();
out[i*4..i*4+4].copy_from_slice(&bytes);
}
}
}
impl Default for Sha256Ctx {
fn default() -> Self {
Self::new()
}
}
pub fn sha256_bytes(data: &[u8], out: &mut [u8;32]) {
let mut c = Sha256Ctx::new();
c.update(data);
c.finalize(out);
}
pub struct Sha512Ctx {
h: [u64;8],
len_bits: u128,
buf: [u8; 128],
buf_len: usize,
}
const SHA512_K: [u64; 80] = [
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,
];
fn rotr64(x: u64, n: u32) -> u64 { (x >> n) | (x << (64 - n)) }
fn read_be_u64(block: &[u8], off: usize) -> u64 {
u64::from_be_bytes([
block[off],
block[off + 1],
block[off + 2],
block[off + 3],
block[off + 4],
block[off + 5],
block[off + 6],
block[off + 7],
])
}
impl Sha512Ctx {
pub fn new() -> Self {
Sha512Ctx {
h: [
0x6a09e667f3bcc908,0xbb67ae8584caa73b,0x3c6ef372fe94f82b,0xa54ff53a5f1d36f1,
0x510e527fade682d1,0x9b05688c2b3e6c1f,0x1f83d9abfb41bd6b,0x5be0cd19137e2179,
],
len_bits: 0,
buf: [0u8; 128],
buf_len: 0,
}
}
fn compress(&mut self, block: &[u8;128]) {
let mut w = [0u64; 80];
for (t, wslot) in w.iter_mut().enumerate().take(16) {
let off = t * 8;
*wslot = read_be_u64(block, off);
}
for t in 16..80 {
let s0 = rotr64(w[t-15], 1) ^ rotr64(w[t-15], 8) ^ (w[t-15] >> 7);
let s1 = rotr64(w[t-2], 19) ^ rotr64(w[t-2], 61) ^ (w[t-2] >> 6);
w[t] = w[t-16].wrapping_add(s0).wrapping_add(w[t-7]).wrapping_add(s1);
}
let mut a = self.h[0];
let mut b = self.h[1];
let mut c = self.h[2];
let mut d = self.h[3];
let mut e = self.h[4];
let mut f = self.h[5];
let mut g = self.h[6];
let mut h = self.h[7];
for t in 0..80 {
let s1 = rotr64(e, 14) ^ rotr64(e, 18) ^ rotr64(e, 41);
let ch = (e & f) ^ ((!e) & g);
let temp1 = h.wrapping_add(s1).wrapping_add(ch).wrapping_add(SHA512_K[t]).wrapping_add(w[t]);
let s0 = rotr64(a, 28) ^ rotr64(a, 34) ^ rotr64(a, 39);
let maj = (a & b) ^ (a & c) ^ (b & c);
let temp2 = s0.wrapping_add(maj);
h = g;
g = f;
f = e;
e = d.wrapping_add(temp1);
d = c;
c = b;
b = a;
a = temp1.wrapping_add(temp2);
}
for i in 0..8 { self.h[i] = self.h[i].wrapping_add([a,b,c,d,e,f,g,h][i]); }
}
pub fn update(&mut self, mut data: &[u8]) {
self.len_bits = self.len_bits.wrapping_add((data.len() as u128) << 3);
if self.buf_len > 0 {
let need = 128 - self.buf_len;
if data.len() >= need {
self.buf[self.buf_len..].copy_from_slice(&data[..need]);
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
data = &data[need..];
} else {
self.buf[self.buf_len..self.buf_len + data.len()].copy_from_slice(data);
self.buf_len += data.len();
return;
}
}
while data.len() >= 128 {
let block: &[u8;128] = match data[..128].try_into() { Ok(b) => b, Err(_) => unreachable!() };
self.compress(block);
data = &data[128..];
}
if !data.is_empty() {
self.buf[..data.len()].copy_from_slice(data);
self.buf_len = data.len();
}
}
pub fn finalize(&mut self, out: &mut [u8;64]) {
let msg_len_bits = self.len_bits;
self.buf[self.buf_len] = 0x80;
self.buf_len += 1;
if self.buf_len > 112 {
for b in &mut self.buf[self.buf_len..128] {
*b = 0;
}
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
}
for b in &mut self.buf[self.buf_len..112] {
*b = 0;
}
self.buf[112..128].copy_from_slice(&msg_len_bits.to_be_bytes());
let block = self.buf;
self.compress(&block);
self.buf_len = 0;
for (i, v) in self.h.iter().enumerate() {
let bytes = v.to_be_bytes();
out[i*8..i*8+8].copy_from_slice(&bytes);
}
}
}
impl Default for Sha512Ctx {
fn default() -> Self {
Self::new()
}
}
pub fn sha512_bytes(data: &[u8], out: &mut [u8;64]) {
let mut c = Sha512Ctx::new();
c.update(data);
c.finalize(out);
}