sha2/
sha256.rs

1use digest::{generic_array::GenericArray, typenum::U64};
2
3cfg_if::cfg_if! {
4    if #[cfg(feature = "force-soft")] {
5        mod soft;
6        use soft::compress;
7    } else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
8        #[cfg(not(feature = "asm"))]
9        mod soft;
10        #[cfg(feature = "asm")]
11        mod soft {
12            pub(crate) use sha2_asm::compress256 as compress;
13        }
14        mod x86;
15        use x86::compress;
16    } else if #[cfg(all(feature = "asm", target_arch = "aarch64"))] {
17        mod soft;
18        mod aarch64;
19        use aarch64::compress;
20    } else if #[cfg(all(feature = "loongarch64_asm", target_arch = "loongarch64"))] {
21        mod loongarch64_asm;
22        use loongarch64_asm::compress;
23    } else {
24        mod soft;
25        use soft::compress;
26    }
27}
28
29/// Raw SHA-256 compression function.
30///
31/// This is a low-level "hazmat" API which provides direct access to the core
32/// functionality of SHA-256.
33#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
34pub fn compress256(state: &mut [u32; 8], blocks: &[GenericArray<u8, U64>]) {
35    // SAFETY: GenericArray<u8, U64> and [u8; 64] have
36    // exactly the same memory layout
37    let p = blocks.as_ptr() as *const [u8; 64];
38    let blocks = unsafe { core::slice::from_raw_parts(p, blocks.len()) };
39    compress(state, blocks)
40}
sha2/sha256.rs

sha2/
sha256.rs
