Crate ethereum_hashing

Optimized SHA256 for use in Ethereum.

The initial purpose of this crate was to provide an abstraction over the hash function used in the beacon chain. The hash function changed during the specification process, so defining it once in this crate made it easy to replace.

Now this crate serves primarily as a wrapper over two SHA256 crates: sha2 and ring – which it switches between at runtime based on the availability of SHA intrinsics.

Re-exports

pub use self::DynamicContext as Context;

Structs

RingImpl

Implementation of SHA256 using the ring crate (fastest on CPUs without SHA extensions).

Enums

DynamicContext

Context encapsulating all implemenation contexts.

DynamicImpl

Default dynamic implementation that switches between available implementations.

Constants

HASH_LEN

Length of a SHA256 hash in bytes.

ZERO_HASHES_MAX_INDEX

The max index that can be used with ZERO_HASHES.

Statics

ZERO_HASHES

Cached zero hashes where ZERO_HASHES[i] is the hash of a Merkle tree with 2^i zero leaves.

Traits

Sha256

Top-level trait implemented by both sha2 and ring implementations.

Sha256Context

Context trait for abstracting over implementation contexts.

Functions

hash

Returns the digest of input using the best available implementation.

hash32_concat

Compute the hash of two slices concatenated.

hash_fixed

Hash function returning a fixed-size array (to save on allocations).

have_sha_extensions