SHA-3 (Keccak)

SHA-3 (Keccak)

Posted Oct 3, 2020 1:24 UTC (Sat) by murukesh (subscriber, #97031)
In reply to: SHA-3 (Keccak) by wittenberg
Parent article: Mercurial planning to transition away from SHA-1

Phrases like "[SHA2-256] is widely supported and some CPUSs have hardware acceleration for that" and "the third category would be picking one of the more modern speed-optimized variants of the SHA3 finalists" makes me think their priorities meant SHA3 itself didn't end up high on the shortlist. The benchmarks in the first post did include SHA3:

I've attached basic benchmark numbers below. The asm variant is using
whatever my Threadripper supports in terms of low-level primitives, e.g.
AVX2 and the SHA extension, either from OpenSSL (BLAKE2, SHA2, SHA3) or
the reference implementations (K12, BLAKE3, BLAKE3*). Test case was
hashing a large file (~7GB). 

BLAKE2s256 (asm)  13.8s
SHA2-256   (asm)   4.5s
SHA2-256   (C)    28.0s
SHA3-256   (asm)  16.7s
SHA3-256   (C)    19.8s
K12        (asm)   5.9s
K12        (C)     9.2s
BLAKE3     (asm)   4.1s
BLAKE3     (C)    10.1s
BLAKE3*    (asm)   5.5s
BLAKE3*    (C)    13.8s

SHA3 is not winning any prizes there.

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