Crypto Tools
Inspect keys, certificates and signatures locally in the browser.
Crypto Tools is a standalone local-first application in the add·ideas Toolbox. Inputs are processed in the browser and are not uploaded.
Version 0.1 scope
- Bounded PEM and DER inspection for X.509 certificates, CSRs and CRLs
- Identification and fingerprinting of public/private PEM key material without decryption
- JWK/JWKS inspection, private-member warnings and RFC 7638 SHA-256 thumbprints
- Explicit issuer-certificate signature links and DNS SAN hostname checks
- A local JSON inspection report with an explicit non-trust model
This is inspection, not complete RFC 5280 path validation, certificate trust, revocation checking, issuance, key generation or general signature verification. Inputs are bounded to 8 MiB and 256 PEM blocks. See docs/ARCHITECTURE.md and docs/PRIVACY-SECURITY.md.
Development
Requires Node.js 22 and npm 11.
npm ci
npm run check
npm run test:browser
Release
npm run release:artifact creates a deterministic release/crypto-tools-0.1.0.zip and checksum sidecar.
Licence
GPL-3.0-or-later. Runtime dependencies retain their own licences; see THIRD_PARTY_NOTICES.md.