1 files changed, 260 insertions, 0 deletions
diff --git a/third_party/rust/sha1/src/compress/soft.rs b/third_party/rust/sha1/src/compress/soft.rs
new file mode 100644
index 0000000000..0b9fb27014
--- /dev/null
+++ b/third_party/rust/sha1/src/compress/soft.rs
@@ -0,0 +1,260 @@
+#![allow(clippy::many_single_char_names)]
+use super::BLOCK_SIZE;
+use core::convert::TryInto;
+
+const K: [u32; 4] = [0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6];
+
+#[inline(always)]
+fn add(a: [u32; 4], b: [u32; 4]) -> [u32; 4] {
+    [
+        a[0].wrapping_add(b[0]),
+        a[1].wrapping_add(b[1]),
+        a[2].wrapping_add(b[2]),
+        a[3].wrapping_add(b[3]),
+    ]
+}
+
+#[inline(always)]
+fn xor(a: [u32; 4], b: [u32; 4]) -> [u32; 4] {
+    [a[0] ^ b[0], a[1] ^ b[1], a[2] ^ b[2], a[3] ^ b[3]]
+}
+
+#[inline]
+pub fn sha1_first_add(e: u32, w0: [u32; 4]) -> [u32; 4] {
+    let [a, b, c, d] = w0;
+    [e.wrapping_add(a), b, c, d]
+}
+
+fn sha1msg1(a: [u32; 4], b: [u32; 4]) -> [u32; 4] {
+    let [_, _, w2, w3] = a;
+    let [w4, w5, _, _] = b;
+    [a[0] ^ w2, a[1] ^ w3, a[2] ^ w4, a[3] ^ w5]
+}
+
+fn sha1msg2(a: [u32; 4], b: [u32; 4]) -> [u32; 4] {
+    let [x0, x1, x2, x3] = a;
+    let [_, w13, w14, w15] = b;
+
+    let w16 = (x0 ^ w13).rotate_left(1);
+    let w17 = (x1 ^ w14).rotate_left(1);
+    let w18 = (x2 ^ w15).rotate_left(1);
+    let w19 = (x3 ^ w16).rotate_left(1);
+
+    [w16, w17, w18, w19]
+}
+
+#[inline]
+fn sha1_first_half(abcd: [u32; 4], msg: [u32; 4]) -> [u32; 4] {
+    sha1_first_add(abcd[0].rotate_left(30), msg)
+}
+
+fn sha1_digest_round_x4(abcd: [u32; 4], work: [u32; 4], i: i8) -> [u32; 4] {
+    match i {
+        0 => sha1rnds4c(abcd, add(work, [K[0]; 4])),
+        1 => sha1rnds4p(abcd, add(work, [K[1]; 4])),
+        2 => sha1rnds4m(abcd, add(work, [K[2]; 4])),
+        3 => sha1rnds4p(abcd, add(work, [K[3]; 4])),
+        _ => unreachable!("unknown icosaround index"),
+    }
+}
+
+fn sha1rnds4c(abcd: [u32; 4], msg: [u32; 4]) -> [u32; 4] {
+    let [mut a, mut b, mut c, mut d] = abcd;
+    let [t, u, v, w] = msg;
+    let mut e = 0u32;
+
+    macro_rules! bool3ary_202 {
+        ($a:expr, $b:expr, $c:expr) => {
+            $c ^ ($a & ($b ^ $c))
+        };
+    } // Choose, MD5F, SHA1C
+
+    e = e
+        .wrapping_add(a.rotate_left(5))
+        .wrapping_add(bool3ary_202!(b, c, d))
+        .wrapping_add(t);
+    b = b.rotate_left(30);
+
+    d = d
+        .wrapping_add(e.rotate_left(5))
+        .wrapping_add(bool3ary_202!(a, b, c))
+        .wrapping_add(u);
+    a = a.rotate_left(30);
+
+    c = c
+        .wrapping_add(d.rotate_left(5))
+        .wrapping_add(bool3ary_202!(e, a, b))
+        .wrapping_add(v);
+    e = e.rotate_left(30);
+
+    b = b
+        .wrapping_add(c.rotate_left(5))
+        .wrapping_add(bool3ary_202!(d, e, a))
+        .wrapping_add(w);
+    d = d.rotate_left(30);
+
+    [b, c, d, e]
+}
+
+fn sha1rnds4p(abcd: [u32; 4], msg: [u32; 4]) -> [u32; 4] {
+    let [mut a, mut b, mut c, mut d] = abcd;
+    let [t, u, v, w] = msg;
+    let mut e = 0u32;
+
+    macro_rules! bool3ary_150 {
+        ($a:expr, $b:expr, $c:expr) => {
+            $a ^ $b ^ $c
+        };
+    } // Parity, XOR, MD5H, SHA1P
+
+    e = e
+        .wrapping_add(a.rotate_left(5))
+        .wrapping_add(bool3ary_150!(b, c, d))
+        .wrapping_add(t);
+    b = b.rotate_left(30);
+
+    d = d
+        .wrapping_add(e.rotate_left(5))
+        .wrapping_add(bool3ary_150!(a, b, c))
+        .wrapping_add(u);
+    a = a.rotate_left(30);
+
+    c = c
+        .wrapping_add(d.rotate_left(5))
+        .wrapping_add(bool3ary_150!(e, a, b))
+        .wrapping_add(v);
+    e = e.rotate_left(30);
+
+    b = b
+        .wrapping_add(c.rotate_left(5))
+        .wrapping_add(bool3ary_150!(d, e, a))
+        .wrapping_add(w);
+    d = d.rotate_left(30);
+
+    [b, c, d, e]
+}
+
+fn sha1rnds4m(abcd: [u32; 4], msg: [u32; 4]) -> [u32; 4] {
+    let [mut a, mut b, mut c, mut d] = abcd;
+    let [t, u, v, w] = msg;
+    let mut e = 0u32;
+
+    macro_rules! bool3ary_232 {
+        ($a:expr, $b:expr, $c:expr) => {
+            ($a & $b) ^ ($a & $c) ^ ($b & $c)
+        };
+    } // Majority, SHA1M
+
+    e = e
+        .wrapping_add(a.rotate_left(5))
+        .wrapping_add(bool3ary_232!(b, c, d))
+        .wrapping_add(t);
+    b = b.rotate_left(30);
+
+    d = d
+        .wrapping_add(e.rotate_left(5))
+        .wrapping_add(bool3ary_232!(a, b, c))
+        .wrapping_add(u);
+    a = a.rotate_left(30);
+
+    c = c
+        .wrapping_add(d.rotate_left(5))
+        .wrapping_add(bool3ary_232!(e, a, b))
+        .wrapping_add(v);
+    e = e.rotate_left(30);
+
+    b = b
+        .wrapping_add(c.rotate_left(5))
+        .wrapping_add(bool3ary_232!(d, e, a))
+        .wrapping_add(w);
+    d = d.rotate_left(30);
+
+    [b, c, d, e]
+}
+
+macro_rules! rounds4 {
+    ($h0:ident, $h1:ident, $wk:expr, $i:expr) => {
+        sha1_digest_round_x4($h0, sha1_first_half($h1, $wk), $i)
+    };
+}
+
+macro_rules! schedule {
+    ($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {
+        sha1msg2(xor(sha1msg1($v0, $v1), $v2), $v3)
+    };
+}
+
+macro_rules! schedule_rounds4 {
+    (
+        $h0:ident, $h1:ident,
+        $w0:expr, $w1:expr, $w2:expr, $w3:expr, $w4:expr,
+        $i:expr
+    ) => {
+        $w4 = schedule!($w0, $w1, $w2, $w3);
+        $h1 = rounds4!($h0, $h1, $w4, $i);
+    };
+}
+
+#[inline(always)]
+fn sha1_digest_block_u32(state: &mut [u32; 5], block: &[u32; 16]) {
+    let mut w0 = [block[0], block[1], block[2], block[3]];
+    let mut w1 = [block[4], block[5], block[6], block[7]];
+    let mut w2 = [block[8], block[9], block[10], block[11]];
+    let mut w3 = [block[12], block[13], block[14], block[15]];
+    #[allow(clippy::needless_late_init)]
+    let mut w4;
+
+    let mut h0 = [state[0], state[1], state[2], state[3]];
+    let mut h1 = sha1_first_add(state[4], w0);
+
+    // Rounds 0..20
+    h1 = sha1_digest_round_x4(h0, h1, 0);
+    h0 = rounds4!(h1, h0, w1, 0);
+    h1 = rounds4!(h0, h1, w2, 0);
+    h0 = rounds4!(h1, h0, w3, 0);
+    schedule_rounds4!(h0, h1, w0, w1, w2, w3, w4, 0);
+
+    // Rounds 20..40
+    schedule_rounds4!(h1, h0, w1, w2, w3, w4, w0, 1);
+    schedule_rounds4!(h0, h1, w2, w3, w4, w0, w1, 1);
+    schedule_rounds4!(h1, h0, w3, w4, w0, w1, w2, 1);
+    schedule_rounds4!(h0, h1, w4, w0, w1, w2, w3, 1);
+    schedule_rounds4!(h1, h0, w0, w1, w2, w3, w4, 1);
+
+    // Rounds 40..60
+    schedule_rounds4!(h0, h1, w1, w2, w3, w4, w0, 2);
+    schedule_rounds4!(h1, h0, w2, w3, w4, w0, w1, 2);
+    schedule_rounds4!(h0, h1, w3, w4, w0, w1, w2, 2);
+    schedule_rounds4!(h1, h0, w4, w0, w1, w2, w3, 2);
+    schedule_rounds4!(h0, h1, w0, w1, w2, w3, w4, 2);
+
+    // Rounds 60..80
+    schedule_rounds4!(h1, h0, w1, w2, w3, w4, w0, 3);
+    schedule_rounds4!(h0, h1, w2, w3, w4, w0, w1, 3);
+    schedule_rounds4!(h1, h0, w3, w4, w0, w1, w2, 3);
+    schedule_rounds4!(h0, h1, w4, w0, w1, w2, w3, 3);
+    schedule_rounds4!(h1, h0, w0, w1, w2, w3, w4, 3);
+
+    let e = h1[0].rotate_left(30);
+    let [a, b, c, d] = h0;
+
+    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);
+}
+
+pub fn compress(state: &mut [u32; 5], blocks: &[[u8; BLOCK_SIZE]]) {
+    let mut block_u32 = [0u32; BLOCK_SIZE / 4];
+    // 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.iter() {
+        for (o, chunk) in block_u32.iter_mut().zip(block.chunks_exact(4)) {
+            *o = u32::from_be_bytes(chunk.try_into().unwrap());
+        }
+        sha1_digest_block_u32(&mut state_cpy, &block_u32);
+    }
+    *state = state_cpy;
+}