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use hacspec_lib::*;
pub enum Variant {
SHA224 = 224,
SHA256 = 256,
SHA384 = 384,
SHA512 = 512,
}
const BLOCK_SIZE: usize = 64;
const LEN_SIZE: usize = 8;
pub const K_SIZE: usize = 64;
pub const HASH_SIZE: usize = Variant::SHA256 as usize / 8;
type WordT = U32;
bytes!(Block, BLOCK_SIZE);
bytes!(OpTableType, 12);
bytes!(Digest, HASH_SIZE);
array!(RoundConstantsTable, K_SIZE, U32);
array!(Hash, 8, U32);
fn ch(x: WordT, y: WordT, z: WordT) -> WordT {
(x & y) ^ ((!x) & z)
}
fn maj(x: WordT, y: WordT, z: WordT) -> WordT {
(x & y) ^ ((x & z) ^ (y & z))
}
fn sigma(x: WordT, i: usize, op: usize) -> WordT {
let op_table = OpTableType::from_public_array([2u8, 13, 22, 6, 11, 25, 7, 18, 3, 17, 19, 10]);
let tmp: WordT = if op == 0 {
x >> op_table[3 * i + 2].into()
} else {
x.rotate_right(op_table[3 * i + 2].into())
};
x.rotate_right(op_table[3 * i].into()) ^ x.rotate_right(op_table[3 * i + 1].into()) ^ tmp
}
fn schedule(block: Block) -> RoundConstantsTable {
let b = block.to_be_U32s();
let mut s = RoundConstantsTable::new();
for i in 0..K_SIZE {
if i < 16 {
s[i] = b[i];
} else {
let t16 = s[i - 16];
let t15 = s[i - 15];
let t7 = s[i - 7];
let t2 = s[i - 2];
let s1 = sigma(t2, 3, 0);
let s0 = sigma(t15, 2, 0);
s[i] = s1 + t7 + s0 + t16;
}
}
s
}
fn shuffle(ws: RoundConstantsTable, hashi: Hash) -> Hash {
let k_table = RoundConstantsTable::from_public_array([
0x428a_2f98,
0x7137_4491,
0xb5c0_fbcf,
0xe9b5_dba5,
0x3956_c25b,
0x59f1_11f1,
0x923f_82a4,
0xab1c_5ed5,
0xd807_aa98,
0x1283_5b01,
0x2431_85be,
0x550c_7dc3,
0x72be_5d74,
0x80de_b1fe,
0x9bdc_06a7,
0xc19b_f174,
0xe49b_69c1,
0xefbe_4786,
0x0fc1_9dc6,
0x240c_a1cc,
0x2de9_2c6f,
0x4a74_84aa,
0x5cb0_a9dc,
0x76f9_88da,
0x983e_5152,
0xa831_c66d,
0xb003_27c8,
0xbf59_7fc7,
0xc6e0_0bf3,
0xd5a7_9147,
0x06ca_6351,
0x1429_2967,
0x27b7_0a85,
0x2e1b_2138,
0x4d2c_6dfc,
0x5338_0d13,
0x650a_7354,
0x766a_0abb,
0x81c2_c92e,
0x9272_2c85,
0xa2bf_e8a1,
0xa81a_664b,
0xc24b_8b70,
0xc76c_51a3,
0xd192_e819,
0xd699_0624,
0xf40e_3585,
0x106a_a070,
0x19a4_c116,
0x1e37_6c08,
0x2748_774c,
0x34b0_bcb5,
0x391c_0cb3,
0x4ed8_aa4a,
0x5b9c_ca4f,
0x682e_6ff3,
0x748f_82ee,
0x78a5_636f,
0x84c8_7814,
0x8cc7_0208,
0x90be_fffa,
0xa450_6ceb,
0xbef9_a3f7,
0xc671_78f2,
]);
let mut h = hashi;
for i in 0..K_SIZE {
let a0 = h[0];
let b0 = h[1];
let c0 = h[2];
let d0 = h[3];
let e0 = h[4];
let f0 = h[5];
let g0 = h[6];
let h0: WordT = h[7];
let t1 = h0 + sigma(e0, 1, 1) + ch(e0, f0, g0) + k_table[i] + ws[i];
let t2 = sigma(a0, 0, 1) + maj(a0, b0, c0);
h[0] = t1 + t2;
h[1] = a0;
h[2] = b0;
h[3] = c0;
h[4] = d0 + t1;
h[5] = e0;
h[6] = f0;
h[7] = g0;
}
h
}
fn compress(block: Block, h_in: Hash) -> Hash {
let s = schedule(block);
let mut h = shuffle(s, h_in);
for i in 0..8 {
h[i] += h_in[i];
}
h
}
pub fn hash(msg: &ByteSeq) -> Digest {
let mut h = Hash::from_public_array([
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab,
0x5be0cd19,
]);
for i in 0..msg.num_chunks(BLOCK_SIZE) {
let (block_len, block) = msg.get_chunk(BLOCK_SIZE, i);
if block_len < BLOCK_SIZE {
let mut last_block = Block::new();
let block = Block::new().update_start(&block);
last_block = last_block.update(0, &block);
last_block[block_len] = U8(0x80);
let len_bist: U64 = (msg.len() * 8).into();
if block_len < BLOCK_SIZE - LEN_SIZE {
last_block = last_block.update(BLOCK_SIZE - LEN_SIZE, &U64_to_be_bytes(len_bist));
h = compress(last_block, h);
} else {
let mut pad_block = Block::new();
pad_block = pad_block.update(BLOCK_SIZE - LEN_SIZE, &U64_to_be_bytes(len_bist));
h = compress(last_block, h);
h = compress(pad_block, h);
}
} else {
let compress_input = Block::new().update_start(&block);
h = compress(compress_input, h);
}
}
Digest::from_seq(&h.to_be_bytes())
}
