P-H-C/phc-winner-argon2

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

5358 stars · 462 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

The reference C implementation of Argon2, the winner of the Password Hashing Competition, providing memory-hard password hashing with Argon2i, Argon2d, and Argon2id variants. It builds as a static/shared library plus a command-line utility for hashing passwords and deriving keys.

Use cases

• hash passwords for secure credential storage
• derive encryption keys from passwords
• protect against GPU cracking attacks
• resist side-channel timing attacks when hashing passwords
• benchmark memory-hard hashing on my system

When to choose

• you need the standard, battle-tested Argon2 implementation in C
• you are storing user passwords and want memory-hard hashing
• you need password-based key derivation resistant to tradeoff attacks

When to avoid

• you need a high-level API in another language (use a binding instead)
• you need fast, non-password hashing like SHA-256 for data integrity
• you need FIPS-certified cryptographic primitives

Facets

library · maturity stable

cryptography security auth security developer-tools windows cross-platform cli password-hashing argon2 memory-hard key-derivation phc-winner linux macos

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