Cose Lib Laravel Package

Product Decisions This Supports

• Passwordless/passkey roadmap: COSE is the signing/encryption envelope used by WebAuthn/FIDO2 attestation and assertion flows. This package supports adding passkey login or step-up authentication to a Laravel app through the web-auth ecosystem instead of hand-rolling CBOR/COSE parsing and crypto.
• Digital credential verification: Directly supports verifying COSE_Sign1-based credentials such as EU Digital COVID Certificate-style health passes, if that is on the roadmap or required for compliance.
• Document and payload signing: Enables compact CBOR-based signatures for internal APIs, device messages, or document-signing features where JOSE/JWT is not the right format.
• Build vs buy: Strong “buy/consume” signal for COSE primitives. Building COSE tag handling, algorithm identifiers, key validation, and signature structures in-house is slow and security-sensitive; this package is MIT-licensed and standards-focused.
• Roadmap sequencing: Treat as an enabling dependency, not a customer-facing differentiator. Approve a spike/security review before committing roadmap dates.
• Scope guardrail: Do not adopt for general JWT/JOSE needs. Use JWT libraries there; COSE is specifically for CBOR-based signing, encryption, MAC, and key management.

When to Consider This Package

• Consider it when:
  • You need COSE_Sign1, COSE_Sign, COSE_Encrypt0, COSE_Encrypt, COSE_Mac0, or COSE_Mac support in PHP.
  • You are building WebAuthn/FIDO2/passkey flows and need low-level attestation/assertion verification; likely via a higher-level web-auth/webauthn-lib integration.
  • You need to verify EU DCC or other COSE-based digital certificates.
  • Your stack is PHP 8.1+, Composer-based, and can use OpenSSL/sodium-backed crypto.
  • Your team can perform security review, pin versions, and monitor a niche OSS dependency.
  • You need RFC 9052/9053/9864 algorithm coverage, including ECDSA, EdDSA, RSA, and HMAC families.
• Look elsewhere when:
  • You need turnkey WebAuthn UI and flows; use a higher-level library or managed identity provider.
  • You need JWT/JWS/JWE; use a JWT/JOSE package instead.
  • You need CMS/PKCS#7, PGP, XMLDSig, or broader PKI workflows.
  • You require vendor SLA, large community support, or multiple maintainers; this package has low stars/direct dependents and is effectively single-maintainer.
  • You cannot accept cryptographic supply-chain risk or cannot run a security review.
  • You are on PHP <8.1 or cannot rely on required extensions/dependencies.

How to Pitch It (Stakeholders)

• Executives: This is a small MIT-licensed building block that lets us add standards-based passwordless/passkey sign-in or verify COSE-based digital credentials without building cryptography ourselves. It lowers time-to-market and license cost, but it is not a standalone product differentiator. Approve only with a security review, pinned version, and fallback plan because adoption is niche.
• Engineering: The package is standards-aligned (RFC 9052/9053/9864), PHP 8.1+, typed, tested, and covers a broad algorithm set. Use it as a low-level dependency alongside spomky-labs/cbor-php and, for WebAuthn, the higher-level web-auth stack. Main risks are low direct adoption, single-maintainer concentration, and cryptographic sensitivity; mitigate with version pinning, integration tests, release monitoring, and avoiding exposure of raw COSE APIs.
• Product: Position it as an enabler for roadmap items such as passkeys, digital health certificate verification, or signed IoT/API payloads. Run a short spike first. If passkeys are strategic, prefer the broader web-auth stack and treat this as a transitive dependency. If the need is only JWT, do not adopt this package.