Security
Digital Signature Generator
Sign a message with a private key or verify a signature with a public key — supports RSA-PSS (SHA-256), ECDSA (P-256), and Ed25519. Pure client-side crypto (Node crypto.createSign/createVerify), no network. Paste a PEM key to sign or to verify a base64 signature. This tool signs/verifies; it does not generate key pairs.
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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/digital-signature-generator' \
-H 'Content-Type: application/json' \
-d '{"mode":"sign","algorithm":"ed25519","message":"This document is authentic.","privateKey":"-----BEGIN PRIVATE KEY-----\nMC4CAQAwBQYDK2VwBCIEILoP...\n-----END PRIVATE KEY-----","publicKey":"-----BEGIN PUBLIC KEY-----\n...\n-----END PUBLIC KEY-----\n\n(Used in Verify mode.)","signature":"Paste the base64 signature to verify. (Used in Verify 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/digital-signature-generatorParameters
| Name | Type | Required | Description |
|---|---|---|---|
| mode | select | No | — |
| algorithm | select | No | — |
| message | textarea | Yes | — |
| privateKey | textarea | No | — |
| publicKey | textarea | No | — |
| signature |
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-digital-signature-generator": {
"name": "digital-signature-generator",
"description": "Sign a message with a private key or verify a signature with a public key — supports RSA-PSS (SHA-256), ECDSA (P-256), and Ed25519. Pure client-side crypto (Node crypto.createSign/createVerify), no network. Paste a PEM key to sign or to verify a base64 signature. This tool signs/verifies; it does not generate key pairs.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=digital-signature-generator",
"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": "digital-signature-generator",
"arguments": {
"mode": "sign",
"algorithm": "ed25519",
"message": "This document is authentic.",
"privateKey": "-----BEGIN PRIVATE KEY-----\nMC4CAQAwBQYDK2VwBCIEILoP...\n-----END PRIVATE KEY-----",
"publicKey": "-----BEGIN PUBLIC KEY-----\n...\n-----END PUBLIC KEY-----\n\n(Used in Verify mode.)",
"signature": "Paste the base64 signature to verify. (Used in Verify mode.)"
}
}
}