sha1/
compress.rs

1use crate::{Block, BlockSizeUser, Sha1Core};
2use digest::typenum::Unsigned;
3
4cfg_if::cfg_if! {
5    if #[cfg(feature = "force-soft")] {
6        mod soft;
7        use soft::compress as compress_inner;
8    } else if #[cfg(all(feature = "asm", target_arch = "aarch64"))] {
9        mod soft;
10        mod aarch64;
11        use aarch64::compress as compress_inner;
12    } else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
13        #[cfg(not(feature = "asm"))]
14        mod soft;
15        #[cfg(feature = "asm")]
16        mod soft {
17            pub use sha1_asm::compress;
18        }
19        mod x86;
20        use x86::compress as compress_inner;
21    } else {
22        mod soft;
23        use soft::compress as compress_inner;
24    }
25}
26
27const BLOCK_SIZE: usize = <Sha1Core as BlockSizeUser>::BlockSize::USIZE;
28
29/// SHA-1 compression function
30#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
31pub fn compress(state: &mut [u32; 5], blocks: &[Block<Sha1Core>]) {
32    // SAFETY: GenericArray<u8, U64> and [u8; 64] have
33    // exactly the same memory layout
34    let blocks: &[[u8; BLOCK_SIZE]] =
35        unsafe { &*(blocks as *const _ as *const [[u8; BLOCK_SIZE]]) };
36    compress_inner(state, blocks);
37}