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Use hardware acceleration for SHA256 (#2426)

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## Proposed Changes

Modify the SHA256 implementation in `eth2_hashing` so that it switches between `ring` and `sha2` to take advantage of [x86_64 SHA extensions](https://en.wikipedia.org/wiki/Intel_SHA_extensions). The extensions are available on modern Intel and AMD CPUs, and seem to provide a considerable speed-up: on my Ryzen 5950X it dropped state tree hashing times by about 30% from 35ms to 25ms (on Prater).

## Additional Info

The extensions became available in the `sha2` crate [last year](https://www.reddit.com/r/rust/comments/hf2vcx/ann_rustcryptos_sha1_and_sha2_now_support/), and are not available in Ring, which uses a [pure Rust implementation of sha2](https://github.com/briansmith/ring/blob/main/src/digest/sha2.rs). Ring is faster on CPUs that lack the extensions so I've implemented a runtime switch to use `sha2` only when the extensions are available. The runtime switching seems to impose a miniscule penalty (see the benchmarks linked below).
This commit is contained in:
Michael Sproul
2021-07-12 08:47:01 +00:00
parent a7b7134abb
commit 2c691af95b
10 changed files with 222 additions and 86 deletions
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Cargo.lock generated
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@@ -1941,6 +1941,7 @@ dependencies = [
name = "eth2_hashing"
version = "0.1.1"
dependencies = [
"cpufeatures",
"lazy_static",
"ring",
"rustc-hex",
@@ -3736,6 +3737,7 @@ dependencies = [
"directory",
"env_logger 0.8.4",
"environment",
"eth2_hashing",
"eth2_libp2p",
"eth2_network_config",
"futures",