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Example code of paragonie/ext-pqcrypto

Informations about the package ext-pqcrypto

ext-pqcrypto: Post-Quantum Cryptography for PHP

CI Latest Stable Version License Downloads crates.io

A PHP extension (written in Rust) that exposes post-quantum cryptography algorithms from the RustCrypto project.

Implements FIPS 203 (ML-KEM), FIPS 204 (ML-DSA), FIPS 205 (SLH-DSA), and X-Wing (hybrid X25519 + ML-KEM-768).

Requirements

Building

After installing, add extension=pqcrypto to your php.ini, then run:

Usage

X-Wing (Hybrid KEM: X25519 + ML-KEM-768)

[!TIP]

X-Wing is the recommend hybrid post-quantum KEM.

ML-KEM (Key Encapsulation)

[!TIP]

We do not recommend ML-KEM-512, but include it for completeness. ML-KEM-768 or ML-KEM-1024 should be used if X-Wing is not acceptable.

ML-DSA (Digital Signatures)

[!TIP]

ML-DSA-44 is fine. The larger parameter sets should only be used if you specifically need them for compliance reasons (i.e., CNSA 2.0).

SLH-DSA (Stateless Hash-Based Signatures)

Key Sizes

KEM

Algorithm Seed Public Key Ciphertext Shared Secret
ML-KEM-512 64 800 768 32
ML-KEM-768 64 1184 1088 32
ML-KEM-1024 64 1568 1568 32
X-Wing 32 1216 1120 32

Signatures

Algorithm Seed Public Key Signature
ML-DSA-44 32 1312 2420
ML-DSA-65 32 1952 3309
ML-DSA-87 32 2592 4627
SLH-DSA-*-128s 64 32 7856
SLH-DSA-*-128f 64 32 17088
SLH-DSA-*-192s 96 48 16224
SLH-DSA-*-192f 96 48 35664
SLH-DSA-*-256s 128 64 29792
SLH-DSA-*-256f 128 64 49856

All sizes above are measured in bytes.

Secret keys are stored as seeds, never semi-expanded secrets. This is a deliberate design choice.

All versions of ext-pqcrypto with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
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