CipherHUB Cryptography Toolkit

CipherHUB MCP Server

Production-grade cryptography toolkit exposing 55 cryptographic operations via MCP (Model Context Protocol). Built and operated by Yang X. CHEN — the engineering decisions behind this service are written up on the blog at cipherhub.cloud.

Overview

CipherHUB enables AI agents to perform cryptographic operations without implementing algorithms themselves. It covers:

• Classical Algorithms: AES (CBC/GCM/CTR/XTS), ChaCha20-Poly1305, RSA, ECC (SECP256R1/384R1/521R1, X25519, Ed25519), SHA-2 family, SHAKE
• Chinese National Standards (国密): SM2, SM3, SM4, ZUC-128, SM9 identity-based cryptography (GM/T 0044)
• Post-Quantum Cryptography: ML-KEM (FIPS 203), ML-DSA (FIPS 204), X25519+ML-KEM-768 Hybrid KEX
• Certificates & Structured Crypto Messages: X.509 parsing and verification, CMS SignedData and EnvelopedData (RFC 5652), COSE_Sign1 (RFC 9052), CBOR (RFC 8949), ASN.1/DER dissection
• Interoperability, verified against three independent stacks: AWS KMS (70/70), Tencent Cloud KMS (39/39), OpenSSL 3.6 (148/154 — 6 skipped, 0 failed)

Quick Start

MCP Endpoint

https://tools.cipherhub.cloud/cipherhub/mcp

Protocol

• Type: Streamable HTTP (MCP protocol revision 2025-03-26)
• Format: JSON-RPC 2.0
• Stateless: No session, no handshake, no API key — every request is a standalone POST
• Deployed version: 1.11.0

Example: Call a Tool

curl -X POST https://tools.cipherhub.cloud/cipherhub/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{
    "jsonrpc": "2.0",
    "method": "tools/call",
    "params": {
      "name": "hash_sum",
      "arguments": {
        "plain_in_hex": "48656c6c6f",
        "required_hash_modes": ["Sha384"]
      }
    },
    "id": 1
  }'

The tool payload is a JSON string inside result.content[0].text:

{
  "code": "success",
  "Results": {
    "Sha384": {
      "hash_sum_in_hex": "3519fe5ad2c596efe3e276a6f351b8fc0b03db861782490d45f7598ebd0ab5fd5520ed102f38c4a5ec834e98668035fc",
      "hash_length": 48
    }
  }
}

Note the conventions: binary input and output travel as hex strings (*_in_hex fields), and algorithm names use TitleCase enum values (Sha384, Sm3) — SHA-384 is rejected by the schema.

More runnable examples: examples/curl_examples.sh and examples/quickstart.py (Python stdlib only).

Tools

Hash & MAC

Key Derivation

Random & Utility

Symmetric Encryption

RSA

ECC

SM2 — Chinese National Standard Curve

SM9 — Identity-Based Cryptography (GM/T 0044)

Post-Quantum Cryptography

X.509 Certificates

Structured Data

COSE & CMS

Prompts

Six ready-made agent workflows served via prompts/list:

Resources

Agent Skill

A ready-to-use Agent Skills package lives in skills/cipherhub-crypto/. It teaches any SKILL.md-compatible agent (Claude Code and others) when to reach for CipherHUB and how to call it — either by registering the MCP server or with plain HTTP. Install:

cp -r skills/cipherhub-crypto ~/.claude/skills/

Client Configuration

Claude Code

claude mcp add --scope user --transport http cipherhub https://tools.cipherhub.cloud/cipherhub/mcp

Claude Desktop

Add to your Claude Desktop config:

{
  "mcpServers": {
    "cipherhub": {
      "url": "https://tools.cipherhub.cloud/cipherhub/mcp"
    }
  }
}

Custom Client

Use any MCP-compatible client with the endpoint URL.

API Documentation

• OpenAPI: https://tools.cipherhub.cloud/.well-known/openapi.yaml
• llms.txt: https://tools.cipherhub.cloud/llms.txt

Web Interface

Interactive web UI available at: https://tools.cipherhub.cloud

Author

Yang X. CHEN

• Blog: https://cipherhub.cloud — the engineering story behind this toolkit: algorithm choices, GmSSL integration, interoperability testing, and post-quantum migration notes
• GitHub: @bowenerchen

License

MIT License