| #![allow(clippy::many_single_char_names)] |
| use crate::consts::{BLOCK_LEN, K64X2}; |
| use core::convert::TryInto; |
| |
| fn add(a: [u64; 2], b: [u64; 2]) -> [u64; 2] { |
| [a[0].wrapping_add(b[0]), a[1].wrapping_add(b[1])] |
| } |
| |
| /// Not an intrinsic, but works like an unaligned load. |
| fn sha512load(v0: [u64; 2], v1: [u64; 2]) -> [u64; 2] { |
| [v1[1], v0[0]] |
| } |
| |
| /// Performs 2 rounds of the SHA-512 message schedule update. |
| pub fn sha512_schedule_x2(v0: [u64; 2], v1: [u64; 2], v4to5: [u64; 2], v7: [u64; 2]) -> [u64; 2] { |
| // sigma 0 |
| fn sigma0(x: u64) -> u64 { |
| ((x << 63) | (x >> 1)) ^ ((x << 56) | (x >> 8)) ^ (x >> 7) |
| } |
| |
| // sigma 1 |
| fn sigma1(x: u64) -> u64 { |
| ((x << 45) | (x >> 19)) ^ ((x << 3) | (x >> 61)) ^ (x >> 6) |
| } |
| |
| let [w1, w0] = v0; |
| let [_, w2] = v1; |
| let [w10, w9] = v4to5; |
| let [w15, w14] = v7; |
| |
| let w16 = sigma1(w14) |
| .wrapping_add(w9) |
| .wrapping_add(sigma0(w1)) |
| .wrapping_add(w0); |
| let w17 = sigma1(w15) |
| .wrapping_add(w10) |
| .wrapping_add(sigma0(w2)) |
| .wrapping_add(w1); |
| |
| [w17, w16] |
| } |
| |
| /// Performs one round of the SHA-512 message block digest. |
| pub fn sha512_digest_round( |
| ae: [u64; 2], |
| bf: [u64; 2], |
| cg: [u64; 2], |
| dh: [u64; 2], |
| wk0: u64, |
| ) -> [u64; 2] { |
| macro_rules! big_sigma0 { |
| ($a:expr) => { |
| ($a.rotate_right(28) ^ $a.rotate_right(34) ^ $a.rotate_right(39)) |
| }; |
| } |
| macro_rules! big_sigma1 { |
| ($a:expr) => { |
| ($a.rotate_right(14) ^ $a.rotate_right(18) ^ $a.rotate_right(41)) |
| }; |
| } |
| macro_rules! bool3ary_202 { |
| ($a:expr, $b:expr, $c:expr) => { |
| $c ^ ($a & ($b ^ $c)) |
| }; |
| } // Choose, MD5F, SHA1C |
| macro_rules! bool3ary_232 { |
| ($a:expr, $b:expr, $c:expr) => { |
| ($a & $b) ^ ($a & $c) ^ ($b & $c) |
| }; |
| } // Majority, SHA1M |
| |
| let [a0, e0] = ae; |
| let [b0, f0] = bf; |
| let [c0, g0] = cg; |
| let [d0, h0] = dh; |
| |
| // a round |
| let x0 = big_sigma1!(e0) |
| .wrapping_add(bool3ary_202!(e0, f0, g0)) |
| .wrapping_add(wk0) |
| .wrapping_add(h0); |
| let y0 = big_sigma0!(a0).wrapping_add(bool3ary_232!(a0, b0, c0)); |
| let (a1, _, _, _, e1, _, _, _) = ( |
| x0.wrapping_add(y0), |
| a0, |
| b0, |
| c0, |
| x0.wrapping_add(d0), |
| e0, |
| f0, |
| g0, |
| ); |
| |
| [a1, e1] |
| } |
| |
| /// Process a block with the SHA-512 algorithm. |
| pub fn sha512_digest_block_u64(state: &mut [u64; 8], block: &[u64; 16]) { |
| let k = &K64X2; |
| |
| macro_rules! schedule { |
| ($v0:expr, $v1:expr, $v4:expr, $v5:expr, $v7:expr) => { |
| sha512_schedule_x2($v0, $v1, sha512load($v4, $v5), $v7) |
| }; |
| } |
| |
| macro_rules! rounds4 { |
| ($ae:ident, $bf:ident, $cg:ident, $dh:ident, $wk0:expr, $wk1:expr) => {{ |
| let [u, t] = $wk0; |
| let [w, v] = $wk1; |
| |
| $dh = sha512_digest_round($ae, $bf, $cg, $dh, t); |
| $cg = sha512_digest_round($dh, $ae, $bf, $cg, u); |
| $bf = sha512_digest_round($cg, $dh, $ae, $bf, v); |
| $ae = sha512_digest_round($bf, $cg, $dh, $ae, w); |
| }}; |
| } |
| |
| let mut ae = [state[0], state[4]]; |
| let mut bf = [state[1], state[5]]; |
| let mut cg = [state[2], state[6]]; |
| let mut dh = [state[3], state[7]]; |
| |
| // Rounds 0..20 |
| let (mut w1, mut w0) = ([block[3], block[2]], [block[1], block[0]]); |
| rounds4!(ae, bf, cg, dh, add(k[0], w0), add(k[1], w1)); |
| let (mut w3, mut w2) = ([block[7], block[6]], [block[5], block[4]]); |
| rounds4!(ae, bf, cg, dh, add(k[2], w2), add(k[3], w3)); |
| let (mut w5, mut w4) = ([block[11], block[10]], [block[9], block[8]]); |
| rounds4!(ae, bf, cg, dh, add(k[4], w4), add(k[5], w5)); |
| let (mut w7, mut w6) = ([block[15], block[14]], [block[13], block[12]]); |
| rounds4!(ae, bf, cg, dh, add(k[6], w6), add(k[7], w7)); |
| let mut w8 = schedule!(w0, w1, w4, w5, w7); |
| let mut w9 = schedule!(w1, w2, w5, w6, w8); |
| rounds4!(ae, bf, cg, dh, add(k[8], w8), add(k[9], w9)); |
| |
| // Rounds 20..40 |
| w0 = schedule!(w2, w3, w6, w7, w9); |
| w1 = schedule!(w3, w4, w7, w8, w0); |
| rounds4!(ae, bf, cg, dh, add(k[10], w0), add(k[11], w1)); |
| w2 = schedule!(w4, w5, w8, w9, w1); |
| w3 = schedule!(w5, w6, w9, w0, w2); |
| rounds4!(ae, bf, cg, dh, add(k[12], w2), add(k[13], w3)); |
| w4 = schedule!(w6, w7, w0, w1, w3); |
| w5 = schedule!(w7, w8, w1, w2, w4); |
| rounds4!(ae, bf, cg, dh, add(k[14], w4), add(k[15], w5)); |
| w6 = schedule!(w8, w9, w2, w3, w5); |
| w7 = schedule!(w9, w0, w3, w4, w6); |
| rounds4!(ae, bf, cg, dh, add(k[16], w6), add(k[17], w7)); |
| w8 = schedule!(w0, w1, w4, w5, w7); |
| w9 = schedule!(w1, w2, w5, w6, w8); |
| rounds4!(ae, bf, cg, dh, add(k[18], w8), add(k[19], w9)); |
| |
| // Rounds 40..60 |
| w0 = schedule!(w2, w3, w6, w7, w9); |
| w1 = schedule!(w3, w4, w7, w8, w0); |
| rounds4!(ae, bf, cg, dh, add(k[20], w0), add(k[21], w1)); |
| w2 = schedule!(w4, w5, w8, w9, w1); |
| w3 = schedule!(w5, w6, w9, w0, w2); |
| rounds4!(ae, bf, cg, dh, add(k[22], w2), add(k[23], w3)); |
| w4 = schedule!(w6, w7, w0, w1, w3); |
| w5 = schedule!(w7, w8, w1, w2, w4); |
| rounds4!(ae, bf, cg, dh, add(k[24], w4), add(k[25], w5)); |
| w6 = schedule!(w8, w9, w2, w3, w5); |
| w7 = schedule!(w9, w0, w3, w4, w6); |
| rounds4!(ae, bf, cg, dh, add(k[26], w6), add(k[27], w7)); |
| w8 = schedule!(w0, w1, w4, w5, w7); |
| w9 = schedule!(w1, w2, w5, w6, w8); |
| rounds4!(ae, bf, cg, dh, add(k[28], w8), add(k[29], w9)); |
| |
| // Rounds 60..80 |
| w0 = schedule!(w2, w3, w6, w7, w9); |
| w1 = schedule!(w3, w4, w7, w8, w0); |
| rounds4!(ae, bf, cg, dh, add(k[30], w0), add(k[31], w1)); |
| w2 = schedule!(w4, w5, w8, w9, w1); |
| w3 = schedule!(w5, w6, w9, w0, w2); |
| rounds4!(ae, bf, cg, dh, add(k[32], w2), add(k[33], w3)); |
| w4 = schedule!(w6, w7, w0, w1, w3); |
| w5 = schedule!(w7, w8, w1, w2, w4); |
| rounds4!(ae, bf, cg, dh, add(k[34], w4), add(k[35], w5)); |
| w6 = schedule!(w8, w9, w2, w3, w5); |
| w7 = schedule!(w9, w0, w3, w4, w6); |
| rounds4!(ae, bf, cg, dh, add(k[36], w6), add(k[37], w7)); |
| w8 = schedule!(w0, w1, w4, w5, w7); |
| w9 = schedule!(w1, w2, w5, w6, w8); |
| rounds4!(ae, bf, cg, dh, add(k[38], w8), add(k[39], w9)); |
| |
| let [a, e] = ae; |
| let [b, f] = bf; |
| let [c, g] = cg; |
| let [d, h] = dh; |
| |
| state[0] = state[0].wrapping_add(a); |
| state[1] = state[1].wrapping_add(b); |
| state[2] = state[2].wrapping_add(c); |
| state[3] = state[3].wrapping_add(d); |
| state[4] = state[4].wrapping_add(e); |
| state[5] = state[5].wrapping_add(f); |
| state[6] = state[6].wrapping_add(g); |
| state[7] = state[7].wrapping_add(h); |
| } |
| |
| pub fn compress(state: &mut [u64; 8], blocks: &[[u8; 128]]) { |
| let mut block_u32 = [0u64; BLOCK_LEN]; |
| // since LLVM can't properly use aliasing yet it will make |
| // unnecessary state stores without this copy |
| let mut state_cpy = *state; |
| for block in blocks { |
| for (o, chunk) in block_u32.iter_mut().zip(block.chunks_exact(8)) { |
| *o = u64::from_be_bytes(chunk.try_into().unwrap()); |
| } |
| sha512_digest_block_u64(&mut state_cpy, &block_u32); |
| } |
| *state = state_cpy; |
| } |