sha2/
sha512.rs

1use digest::{generic_array::GenericArray, typenum::U128};
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) fn compress(state: &mut [u64; 8], blocks: &[[u8; 128]]) {
13                sha2_asm::compress512(state, blocks);
14            }
15        }
16        mod x86;
17        use x86::compress;
18    } else {
19        mod soft;
20        use soft::compress;
21    }
22}
23
24/// Raw SHA-512 compression function.
25///
26/// This is a low-level "hazmat" API which provides direct access to the core
27/// functionality of SHA-512.
28#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
29pub fn compress512(state: &mut [u64; 8], blocks: &[GenericArray<u8, U128>]) {
30    // SAFETY: GenericArray<u8, U64> and [u8; 64] have
31    // exactly the same memory layout
32    let p = blocks.as_ptr() as *const [u8; 128];
33    let blocks = unsafe { core::slice::from_raw_parts(p, blocks.len()) };
34    compress(state, blocks)
35}