wyhash
prvhash
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wyhash
- Wyhash: The fastest quality hash function
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What hash function you use for hash maps / hash tables?
I recently switched to wyhash as it seems to have a good combination of speed and stability.
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Are there any weaker hashes than MD5, but still randomly distributed?
wyhash is a decent option for if you don't need a cryptographical quality hash
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Hacker News top posts: Mar 15, 2021
New Bare Hash Map: 2X-3X Speedup over SOTA\ (32 comments)
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New Bare Hash Map: 2X-3X Speedup over SOTA
I feel like you’d want something a bit safer than “we don’t store the keys and just rely on the hash to be really good” [1], putting “please do not use this for serious tasks” in a comment embedded in the header file isn’t a clear enough warning.
It’s not clear to me that that probability of collision assumptions hold. It’s basically assuming that the hashing is perfect and distributes any inputs to the full 64-bit space with uniform probability. That’s the usual hash map / randomized algorithm hope, but does BigCrush or similar avalanche testing really prove that? (Presumably not, otherwise there wouldn’t be image attacks for things like md5).
[1] https://github.com/wangyi-fudan/wyhash/blob/d2a305811972f391...
- wyhash and wyrand are a non-cryptographic 64-bit hash function and PRNG respectively
prvhash
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What are some alternatives?
smhasher - Hash function quality and speed tests
komihash - Very fast, high-quality hash function, discrete-incremental and streamed hashing-capable (non-cryptographic, inline C/C++) 26GB/s + PRNG
aHash - aHash is a non-cryptographic hashing algorithm that uses the AES hardware instruction
mersenne-twister-predictor - Predict MT19937 PRNG, from preceding 624 generated numbers. There is a specialization for the "random" of Python standard library.
meow_hash - Official version of the Meow hash, an extremely fast level 1 hash
cauldron - A collection of single-file C libraries. (generic containers, random number generation, argument parsing and other functionalities)
leocad - A CAD application for creating virtual LEGO models
pthash - Fast and compact minimal perfect hash functions in C++.
smhasher - Automatically exported from code.google.com/p/smhasher
JohnTheRipper - John the Ripper jumbo - advanced offline password cracker, which supports hundreds of hash and cipher types, and runs on many operating systems, CPUs, GPUs, and even some FPGAs [Moved to: https://github.com/openwall/john]
Mersenne-Twister-in-Python - A Mersenne Twister Random Number Generator
ZedmeeHash - Strong, fast, simple, non-cryptographic hash function