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perf: Replace internal SHA256 hashing with xxhash for 4-6x performance improvement (#676)

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* perf(internal): Use FastHash for internal hashing
docs: Add xxhash performance improvement to changelog entry
feat(hash): Add fast non-cryptographic hash function

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

* test(hash): add xxhash benchmarks and collision tests

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

* Update metadata

check-spelling run (pull_request) for json/hash

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---------

Signed-off-by: Jason Cameron <git@jasoncameron.dev>
Signed-off-by: check-spelling-bot <check-spelling-bot@users.noreply.github.com>
This commit is contained in:
Jason Cameron 2025-06-16 22:53:53 -04:00 • committed by GitHub
parent 3437e575d4
commit e2b46fc5e7
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11 changed files with 291 additions and 16 deletions
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13
internal/hash.go
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@ -3,10 +3,23 @@ package internal
import (
"crypto/sha256"
"encoding/hex"
"strconv"
"github.com/cespare/xxhash/v2"
)
// SHA256sum computes a cryptographic hash. Still used for proof-of-work challenges
// where we need the security properties of a cryptographic hash function.
func SHA256sum(text string) string {
hash := sha256.New()
hash.Write([]byte(text))
return hex.EncodeToString(hash.Sum(nil))
}
// FastHash is a high-performance non-cryptographic hash function suitable for
// internal caching, policy rule identification, and other performance-critical
// use cases where cryptographic security is not required.
func FastHash(text string) string {
h := xxhash.Sum64String(text)
return strconv.FormatUint(h, 16)
}