HighwayHash

HighwayHash is a fast keyed hash/pseudorandom function developed by Jyrki Alakuijala and Jan Wassenberg. The stated design goals are high-throughput mixing and low-cost finalization. An open-source (Apache 2 license) reference implementation was published in March 2016.

Overview

HighwayHash computes 64, 128 or 256-bit digests of variable-length inputs, using a 256-bit seed/key. It processes 32 bytes at a time using AVX-2 SIMD instructions. For 1 KiB blocks, the reported^[1] throughput is 0.24 cycles per byte. This is more than 10 times as fast as cryptographic hashes in the ECRYPT hash benchmark.^[2]

HighwayHash is not claimed to be a cryptographic hash, but the authors have undertaken preliminary cryptanalysis^[3] and claim resistance against differential, length-extension and rotational attacks.

The mixing multiplies 32-bit halves of the input with internal state, yielding a 64-bit result which is permuted and added to the state. The finalization involves four mixing rounds.

Applications

Suggested applications of HighwayHash include:

pseudorandom number generation, e.g. to assign items to bins for A/B tests
replacing larger data with hash 'fingerprints'
authenticating short-lived messages such as RPCs
data structures resistant to hash-flooding attacks.

Naming

The name HighwayHash is similar to other hashes developed within Google: CityHash and FarmHash.

References

↑ Jyrki Alakuijala, Jan Wassenberg (2017-01-24). "HighwayHash description".
↑ "eBACS: ECRYPT Benchmarking of Cryptographic Systems".
↑ Jyrki Alakuijala, Bill Cox, Jan Wassenberg (2016-12-28). "Fast keyed hash/pseudo-random function using SIMD multiply and permute" (PDF).

External links

Jyrki Alakuijala, Jan Wassenberg. "HighwayHash on Github: fast mixing".
"Google Open Source Blog (release announcement)".

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