WebCrypt MCP Server

WebCrypt is a cryptography toolkit exposed as an MCP server: six tools cover AES-256-GCM and RSA-4096 encryption and decryption, key management, hashing, digital signatures, and post-quantum key encapsulation and signing with Kyber and Dilithium. It runs entirely through the native W3C Web Crypto API with zero runtime dependencies, distributed as the npm package webcrypt and launched with npx webcrypt mcp over stdio. The server implements its own JSON-RPC 2.0 stdio framing rather than depending on an MCP SDK, and its README states that all operations execute locally with no external API calls, telemetry or network transmissions, which leaves it with no authentication surface of its own.

The GitHub organization putervision owns the repository and publishes the npm package; the package's mcpName field self-declares the registry identity io.github.putervision/webcrypt, matching the official MCP Registry record exactly. WebCrypt fronts no external vendor's API or service; it is a tool of putervision's own making, published under its own verified registry namespace, which sets authority to first_party here. Two sibling servers from the same publisher, state-memory-mcp and vision-memory-mcp, are already cataloged under the shared publisher record github-putervision.

Its own docs/ARCHITECTURE.md states that WebCrypt v1.0.1 "introduces a zero-dependency Model Context Protocol (MCP) stdio server conforming to JSON-RPC 2.0 and specification 2024-11-05," a vendor-authored statement naming a specific, early revision. That sets spec_status to legacy with latest_spec 2024-11-05, several revisions behind the site's current 2026-07-28. npm lists version 1.0.1 as current, one patch ahead of the newest tagged GitHub release, 1.0.0 from 2026-08-21; no GitHub release or tag exists for 1.0.1.