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(all(feature = "loongarch64_asm", target_arch = "loongarch64"))] {
13        mod loongarch64_asm;
14        use loongarch64_asm::compress as compress_inner;
15    } else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
16        #[cfg(not(feature = "asm"))]
17        mod soft;
18        #[cfg(feature = "asm")]
19        mod soft {
20            pub use sha1_asm::compress;
21        }
22        mod x86;
23        use x86::compress as compress_inner;
24    } else {
25        mod soft;
26        use soft::compress as compress_inner;
27    }
28}
29
30const BLOCK_SIZE: usize = <Sha1Core as BlockSizeUser>::BlockSize::USIZE;
31
32/// SHA-1 compression function
33#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
34pub fn compress(state: &mut [u32; 5], blocks: &[Block<Sha1Core>]) {
35    // SAFETY: GenericArray<u8, U64> and [u8; 64] have
36    // exactly the same memory layout
37    let blocks: &[[u8; BLOCK_SIZE]] =
38        unsafe { &*(blocks as *const _ as *const [[u8; BLOCK_SIZE]]) };
39    compress_inner(state, blocks);
40}