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: *const [u8; 64] = blocks.as_ptr() as *const [u8; 64];
38 let blocks: &[[u8; 64]] = unsafe { core::slice::from_raw_parts(data:p, blocks.len()) };
39 compress(state, blocks)
40}
41