sha2/
sha512.rs

1use digest::{generic_array::GenericArray, typenum::U128};
2
3cfg_if::cfg_if! {
4    if #[cfg(feature = "force-soft-compact")] {
5        mod soft_compact;
6        use soft_compact::compress;
7    } else if #[cfg(feature = "force-soft")] {
8        mod soft;
9        use soft::compress;
10    } else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
11        #[cfg(not(feature = "asm"))]
12        mod soft;
13        #[cfg(feature = "asm")]
14        mod soft {
15            pub(crate) fn compress(state: &mut [u64; 8], blocks: &[[u8; 128]]) {
16                sha2_asm::compress512(state, blocks);
17            }
18        }
19        mod x86;
20        use x86::compress;
21    } else if #[cfg(all(feature = "asm", target_arch = "aarch64"))] {
22        mod soft;
23        mod aarch64;
24        use aarch64::compress;
25    } else if #[cfg(all(feature = "loongarch64_asm", target_arch = "loongarch64"))] {
26        mod loongarch64_asm;
27        use loongarch64_asm::compress;
28    } else {
29        mod soft;
30        use soft::compress;
31    }
32}
33
34/// Raw SHA-512 compression function.
35///
36/// This is a low-level "hazmat" API which provides direct access to the core
37/// functionality of SHA-512.
38#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
39pub fn compress512(state: &mut [u64; 8], blocks: &[GenericArray<u8, U128>]) {
40    // SAFETY: GenericArray<u8, U64> and [u8; 64] have
41    // exactly the same memory layout
42    let p = blocks.as_ptr() as *const [u8; 128];
43    let blocks = unsafe { core::slice::from_raw_parts(p, blocks.len()) };
44    compress(state, blocks)
45}