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Informations about the package php-rdf-canonicalize

PHP-RDF-Canonicalize

CI Packagist Version PHP Version License W3C rdf-canon

A PHP implementation of the W3C RDF Dataset Canonicalization (RDFC-1.0) algorithm (the standard that supersedes URDNA2015).

Status: stable (1.0). Extracted from accredifysg/verifiable-credentials-php (mirroring how accredifysg/php-json-ld was), and fully conformant with the W3C rdf-canon suite (86/86). The public API and the canonical output are covered by Semantic Versioning — breaking either bumps the major version. The output is consensus-critical: VC's eddsa-rdfc-2022 and ecdsa-sd-2023 signatures are computed over it — see Parity.

What it does

RDFC-1.0 takes an RDF dataset and produces a canonical (deterministic) serialization, so that two datasets that are equal up to blank-node relabelling serialise to exactly the same bytes. That canonical form is what gets hashed and signed by Data Integrity cryptographic suites.

This package operates purely on an RDF dataset expressed as N-Quads:

Converting JSON-LD to N-Quads (the toRdf algorithm) is out of scope and is the caller's responsibility — use accredifysg/php-json-ld's toRdf() for that. This package intentionally has no dependency on php-json-ld.

Installation

Requires PHP 8.2+ with the hash (SHA-256) and mbstring extensions.

Usage

RDFC10 implements Accredify\RdfCanonicalize\Contracts\Canonicalizer. After canonicalising, getCanonicalIdMap() returns the map of original → canonical blank node identifiers.

Pairing it with php-json-ld to canonicalise a JSON-LD document:

Hash algorithm

RDFC-1.0 uses SHA-256 by default. Pass the spec's optional SHA-384 profile (or any algorithm hash_algos() reports) via the constructor:

Components

The N-Quads I/O is factored into two reusable, composable classes that RDFC10 uses internally and accepts via its constructor:

Scope

Out of scope for the 1.x line: JSON-LD → N-Quads conversion (use php-json-ld).

Parity with verifiable-credentials-php

The canonical output is a frozen, consensus-critical contract: VC's eddsa-rdfc-2022 and ecdsa-sd-2023 suites sign over it. For the N-Quads VC actually produces (via php-json-ld's toRdf), the output is byte-for-byte identical to the implementation VC originally shipped — verified by replaying the full pipeline over real signed credentials (see tools/corpus-replay.php).

tests/ParityTest.php locks this with exact-byte fixtures. Under SemVer, changing the canonical output is a major version bump, paired with a coordinated regeneration of VC's signed fixtures.

Conformance

Tested against the official W3C rdf-canon test suite, pulled in as a git submodule at tests/w3c/. See tests/W3c/README.md for the harness layout.

Score (v1.0.0) — full conformance

Test type W3C suite Passing
Eval 64 64
Map (identifiers) 21 21
NegativeEval 1 1
Total 86 86

The W3C suite gates CI (no allowlist — every case passes). The canonical output is frozen under SemVer; a future change would be a major version bump plus a coordinated regeneration of VC's signed fixtures. See the CHANGELOG for the 0.x → 1.0 conformance history.

License

MIT © Accredify

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