vendor/sha-1/src/compress/aarch64.rs

   1 #![cfg(feature = "asm-aarch64")]
   2 use libc::{getauxval, AT_HWCAP, HWCAP_SHA1};
   3
   4 fn sha1_supported() -> bool {
   5     #[allow(unsafe_code)]
   6     let hwcaps: u64 = unsafe { getauxval(AT_HWCAP) };
   7     (hwcaps & HWCAP_SHA1) != 0
   8 }
   9
  10 pub fn compress(state: &mut [u32; 5], blocks: &[u8; 64]) {
  11     // TODO: Replace this platform-specific call with is_aarch64_feature_detected!("sha1") once
  12     // that macro is stabilised and https://github.com/rust-lang/rfcs/pull/2725 is implemented
  13     // to let us use it on no_std.
  14     if sha1_supported() {
  15         for block in blocks {
  16             sha1_asm::compress(state, block);
  17         }
  18     } else {
  19         super::soft::compress(state, blocks);
  20     }
  21 }