Security

Shamir Secret Sharing

Split a secret into n shares where any k (the threshold) are required to reconstruct it — Shamir's k-of-n scheme over GF(256). Pure in-process cryptography (crypto.randomBytes for polynomial coefficients), no network. Split a password/key/passphrase into shares held by separate people, then combine any k of them to recover it. Confidentiality only — no authenticity.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/shamir-secret-sharing' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"split","secret":"my-master-password","threshold":3,"shares":5,"shareInput":"Paste shares to combine (one per line). At least k shares required. Used in Combine mode."}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/shamir-secret-sharing

Parameters

Name	Type	Required	Description
mode	select	No	—
secret	textarea	No	—
threshold	number	No	—
shares	number	No	—
shareInput	textarea	No	—

Response format

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-shamir-secret-sharing": {
      "name": "shamir-secret-sharing",
      "description": "Split a secret into n shares where any k (the threshold) are required to reconstruct it — Shamir's k-of-n scheme over GF(256). Pure in-process cryptography (crypto.randomBytes for polynomial coefficients), no network. Split a password/key/passphrase into shares held by separate people, then combine any k of them to recover it. Confidentiality only — no authenticity.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=shamir-secret-sharing",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "shamir-secret-sharing",
    "arguments": {
  "mode": "split",
  "secret": "my-master-password",
  "threshold": 3,
  "shares": 5,
  "shareInput": "Paste shares to combine (one per line). At least k shares required. Used in Combine mode."
}
  }
}

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