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feat(hashes): add Jenkins-One-At-A-Time function #14560

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feat(hashes): add Jenkins-One-At-A-Time function #14560

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4cf229d
Add joaat function for non-cryptographic hashing
Sarbatore Apr 14, 2026
42139fd
Add doctest for joaat function
Sarbatore Apr 14, 2026
c9376b9
Refactor joaat function variable names for prevent shadowing
Sarbatore Apr 14, 2026
0ac7d1f
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 14, 2026
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Add joaat function for non-cryptographic hashing 
Implement the Jenkins-One-At-A-Time hash function.
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@Sarbatore
Sarbatore authored Apr 14, 2026
commit 4cf229d9f0fd302d5c748421c2c2f3ceafbc0648
22 changes: 22 additions & 0 deletions hashes/joaat.py
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"""
The Bob Jenkins hash is a fast, non-cryptographic hash function
designed for general-purpose use, such as hash table lookups.

source: https://en.wikipedia.org/wiki/Jenkins_hash_function
"""

def joaat(key: str) -> int:
hash = 0
mask = 0xFFFFFFFF
key_bytes = key.encode('utf-8')

for byte in key_bytes:
hash = (hash + byte) & mask
hash = (hash + (hash << 10)) & mask
hash = (hash ^ (hash >> 6)) & mask

hash = (hash + (hash << 3)) & mask
hash = (hash ^ (hash >> 11)) & mask
hash = (hash + (hash << 15)) & mask

return hash