wyhash has evolved into rapidhash !
With improved speed, quality and compatibility.
wyhash and wyrand are the ideal 64-bit hash function and PRNG respectively:
solid: wyhash passed SMHasher, wyrand passed BigCrush, practrand.
portable: 64-bit/32-bit system, big/little endian.
fastest: Efficient on 64-bit machines, especially for short keys.
simplest: In the sense of code size.
salted: We use dynamic secret to avoid intended attack.
wyhash is the default hashing algorithm of the great Zig, V, Nim and Go (since 1.17) language. One milestone is that wyhash has deployed by Microsoft on [Windows Terminal] (microsoft/terminal#13686).
Simple Example:
#include "wyhash.h"
uint64_t _wyp[4];
make_secret(time(NULL),_wyp);
string s="fcdskhfjs";
uint64_t h=wyhash(s.c_str(),s.size(),0,_wyp);
Limitations:
It is known now that wyhash/wyrand have their limitations:
Both of them are not 64 bit collision resistant, but is about 62 bits (flyingmutant/Cyan4973/vigna)
When test on longer dataset (32TB, 23 days), wyrand will fail practrand (vigna)
And there may be more flaws detected in the future.
User should make their own decision based the advantage and the flaws of wyhash/wyrand as no one is perfect.
C# https://github.com/cocowalla/wyhash-dotnet
C++ https://github.com/tommyettinger/waterhash
C++ https://github.com/alainesp/wy
GO https://github.com/dgryski/go-wyhash
GO https://github.com/orisano/wyhash
GO https://github.com/littleli/go-wyhash16
GO https://github.com/zeebo/wyhash
GO https://github.com/lonewolf3739/wyhash-go
GO https://github.com/zhangyunhao116/wyhash (final version 1 && 3)
Java https://github.com/OpenHFT/Zero-Allocation-Hashing
Java https://github.com/dynatrace-oss/hash4j (final version 3 and 4)
Kotlin Multiplatform https://github.com/appmattus/crypto/tree/main/cryptohash
Nim https://github.com/nim-lang/Nim/blob/devel/lib/pure/hashes.nim
Nim https://github.com/jackhftang/wyhash.nim
Nim https://github.com/littleli/nim-wyhash16
Rust https://github.com/eldruin/wyhash-rs
Swift https://github.com/lemire/SwiftWyhash
Swift https://github.com/lemire/SwiftWyhashBenchmark
Swift https://github.com/jeudesprits/PSWyhash
V https://github.com/vlang/v/tree/master/vlib/hash/wyhash (v4)
Zig https://github.com/ManDeJan/zig-wyhash
absl hashmap https://github.com/abseil/abseil-cpp/blob/master/absl/hash/internal/low_level_hash.h
I thank these names:
Reini Urban
Dietrich Epp
Joshua Haberman
Tommy Ettinger
Daniel Lemire
Otmar Ertl
cocowalla
leo-yuriev
Diego Barrios Romero
paulie-g
dumblob
Yann Collet
ivte-ms
hyb
James Z.M. Gao
easyaspi314 (Devin)
TheOneric
flyingmutant
vigna
tansy
