44 lines
1.4 KiB
Rust
44 lines
1.4 KiB
Rust
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use digest::{generic_array::GenericArray, typenum::U64};
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cfg_if::cfg_if! {
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if #[cfg(feature = "force-soft-compact")] {
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mod soft_compact;
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use soft_compact::compress;
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} else if #[cfg(feature = "force-soft")] {
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mod soft;
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use soft::compress;
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} else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
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#[cfg(not(feature = "asm"))]
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mod soft;
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#[cfg(feature = "asm")]
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mod soft {
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pub(crate) use sha2_asm::compress256 as compress;
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}
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mod x86;
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use x86::compress;
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} else if #[cfg(all(feature = "asm", target_arch = "aarch64"))] {
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mod soft;
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mod aarch64;
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use aarch64::compress;
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} else if #[cfg(all(feature = "loongarch64_asm", target_arch = "loongarch64"))] {
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mod loongarch64_asm;
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use loongarch64_asm::compress;
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} else {
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mod soft;
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use soft::compress;
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}
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}
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/// Raw SHA-256 compression function.
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///
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/// This is a low-level "hazmat" API which provides direct access to the core
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/// functionality of SHA-256.
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#[cfg_attr(docsrs, doc(cfg(feature = "compress")))]
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pub fn compress256(state: &mut [u32; 8], blocks: &[GenericArray<u8, U64>]) {
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// SAFETY: GenericArray<u8, U64> and [u8; 64] have
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// exactly the same memory layout
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let p = blocks.as_ptr() as *const [u8; 64];
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let blocks = unsafe { core::slice::from_raw_parts(p, blocks.len()) };
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compress(state, blocks)
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}
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