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use digest::{generic_array::GenericArray, typenum::U64};
cfg_if::cfg_if! {
if #[cfg(feature = "force-soft")] {
mod soft;
use soft::compress;
} else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
#[cfg(not(feature = "asm"))]
mod soft;
#[cfg(feature = "asm")]
mod soft {
pub(crate) use sha2_asm::compress256 as compress;
}
mod x86;
use x86::compress;
} else if #[cfg(all(feature = "asm", target_arch = "aarch64"))] {
mod soft;
mod aarch64;
use aarch64::compress;
} else {
mod soft;
use soft::compress;
}
}
/// Raw SHA-256 compression function.
///
/// This is a low-level "hazmat" API which provides direct access to the core
/// functionality of SHA-256.
#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
pub fn compress256(state: &mut [u32; 8], blocks: &[GenericArray<u8, U64>]) {
// SAFETY: GenericArray<u8, U64> and [u8; 64] have
// exactly the same memory layout
let p = blocks.as_ptr() as *const [u8; 64];
let blocks = unsafe { core::slice::from_raw_parts(p, blocks.len()) };
compress(state, blocks)
}