xxHash128
High-performance xxHash128 for large-scale systems - fastest 128-bit hash for big data applications
Short explanation
xxHash is a family of extremely fast non-cryptographic hash functions built for checksums, cache keys, deduplication, and high-throughput data pipelines. It is designed for speed and distribution, not for security.
Example input
customer:4815162342:invoice:2026-07Typical use
Hash stable strings or byte ranges when you need a compact fingerprint for partitioning, lookup, bucketing, or quick change detection.
When to use it
- Hash table keys, cache keys, bloom filters, or partitioning keys.
- Fast file or chunk fingerprinting where malicious collision attacks are not part of the threat model.
- Data engineering jobs that need high throughput and repeatable non-security hashes.
When not to use it
- Password storage, API signatures, tokens, certificates, or security-sensitive integrity checks.
- Any place where an attacker can choose input and benefit from collisions.
- Regulated cryptographic workflows that require SHA-2, SHA-3, BLAKE2, or another approved primitive.
FAQ
Is xxHash cryptographically secure?
No. xxHash is intentionally non-cryptographic. Use it for speed, not for authentication, password hashing, or tamper-resistant integrity.
Should I use xxHash32, xxHash64, or xxHash128?
Use xxHash64 as the practical default on modern systems. Use xxHash32 for legacy 32-bit compatibility and xxHash128 when you need a wider fingerprint for large-scale datasets.
Is xxHash better than CRC-32?
For many software workloads, xxHash is faster and has better distribution. CRC-32 is still useful when protocol or file-format compatibility requires it.
High-performance xxHash128 for large-scale systems - fastest 128-bit hash for big data applications
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FNV-1
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Jenkins One-at-a-Time
Bob Jenkins' One-at-a-Time hash