mirror of
https://github.com/BLAKE3-team/BLAKE3
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b5f1e925f7
This is simpler than sometimes incrementing by CHUNK_LEN and other times incrementing by BLOCK_LEN.
85 lines
2.2 KiB
Rust
85 lines
2.2 KiB
Rust
use crate::{CVWords, IncrementCounter, BLOCK_LEN, OUT_LEN};
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pub const DEGREE: usize = 4;
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// Unsafe because this may only be called on platforms supporting NEON.
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pub unsafe fn hash_many<A: arrayvec::Array<Item = u8>>(
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inputs: &[&A],
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key: &CVWords,
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counter: u64,
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increment_counter: IncrementCounter,
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flags: u8,
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flags_start: u8,
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flags_end: u8,
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out: &mut [u8],
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) {
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// The Rust hash_many implementations do bounds checking on the `out`
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// array, but the C implementations don't. Even though this is an unsafe
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// function, assert the bounds here.
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assert!(out.len() >= inputs.len() * OUT_LEN);
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ffi::blake3_hash_many_neon(
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inputs.as_ptr() as *const *const u8,
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inputs.len(),
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A::CAPACITY / BLOCK_LEN,
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key.as_ptr(),
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counter,
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increment_counter.yes(),
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flags,
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flags_start,
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flags_end,
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out.as_mut_ptr(),
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)
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}
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// blake3_neon.c normally depends on blake3_portable.c, because the NEON
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// implementation only provides 4x compression, and it relies on the portable
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// implementation for 1x compression. However, we expose the portable Rust
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// implementation here instead, to avoid linking in unnecessary code.
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#[no_mangle]
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pub extern "C" fn blake3_compress_in_place_portable(
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cv: *mut u32,
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block: *const u8,
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block_len: u8,
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counter: u64,
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flags: u8,
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) {
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unsafe {
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crate::portable::compress_in_place(
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&mut *(cv as *mut [u32; 8]),
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&*(block as *const [u8; 64]),
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block_len,
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counter,
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flags,
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)
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}
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}
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pub mod ffi {
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extern "C" {
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pub fn blake3_hash_many_neon(
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inputs: *const *const u8,
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num_inputs: usize,
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blocks: usize,
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key: *const u32,
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counter: u64,
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increment_counter: bool,
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flags: u8,
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flags_start: u8,
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flags_end: u8,
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out: *mut u8,
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);
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_hash_many() {
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// This entire file is gated on feature="c_neon", so NEON support is
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// assumed here.
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crate::test::test_hash_many_fn(hash_many, hash_many);
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}
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}
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