skills/plugins/document-navigator/docs/foundation/bitpacker/bitpacker-crypto/src/xxhash32.md at 7d268b52c23aa248ab40136042c0c13197993e48

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admin 9bf56a806b Move docs/ package mirror into document-navigator plugin

Relocate the ~6k-file docs tree from the repo root into
plugins/document-navigator/docs/ so the plugin is self-contained and
portable. docs/superpowers/ (specs and plans) stays at the repo root.

Moved via cp+rm rather than git mv because directory rename() fails with
EPERM on this WSL /mnt DrvFs mount; git rename-detection pairs the
identical-content files at commit time.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-05-30 01:10:00 +01:00

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xxhash32

Path: src/xxhash32.ts
Export: calculateXxhash32, verifyXxhash32, packXxhash32, unpackXxhash32, appendXxhash32, verifyAndStripXxhash32

What it does

Pure TypeScript implementation of the XXHash32 non-cryptographic hash algorithm (spec v0.8.2). No external dependencies.

Key API

Function	Description
`calculateXxhash32(data, seed?)`	Compute 32-bit hash of a `Uint8Array`
`verifyXxhash32(data, expected, seed?)`	Verify a hash matches
`packXxhash32(checksum)`	Pack hash as 4 little-endian bytes
`unpackXxhash32(bytes, offset?)`	Unpack 4 bytes to hash value
`appendXxhash32(data, seed?)`	Append 4-byte hash to data
`verifyAndStripXxhash32(data, seed?)`	Verify and strip appended hash

Constants

PRIME1 = 0x9e3779b1
PRIME2 = 0x85ebca77
PRIME3 = 0xc2b2ae3d
PRIME4 = 0x27d4eb2f
PRIME5 = 0x165667b1

Used by

Checksum validation in downstream network protocols

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