Cryptography

HMAC + BLAKE3 + SHA-3/Keccak + Poly1305 + BLAKE2 Keyed MAC Construction Linter

Compute and audit MACs across HMAC-SHA-2/SHA-3, keyed BLAKE2, BLAKE3, KMAC and Poly1305 with official known-answer self-tests, key/tag-length linting and a cross-construction compatibility matrix.

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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/hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter' \
  -H 'Content-Type: application/json' \
  -d '{"message":"The quick brown fox jumps over the lazy dog","messageEncoding":"utf8","keyHex":"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f","tagBytes":32,"customLabel":"myapi/v1/webhook"}'

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/hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter

Parameters

Name	Type	Required	Description
message	textarea	Yes	—
messageEncoding	select	No	—
keyHex	text	Yes	—
tagBytes	number	No	—
customLabel	text	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-hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter": {
      "name": "hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter",
      "description": "Compute and audit MACs across HMAC-SHA-2/SHA-3, keyed BLAKE2, BLAKE3, KMAC and Poly1305 with official known-answer self-tests, key/tag-length linting and a cross-construction compatibility matrix.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter",
      "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": "hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter",
    "arguments": {
  "message": "The quick brown fox jumps over the lazy dog",
  "messageEncoding": "utf8",
  "keyHex": "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
  "tagBytes": 32,
  "customLabel": "myapi/v1/webhook"
}
  }
}

Browse tools Open tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter' \ -H 'Content-Type: application/json' \ -d '{"message":"The quick brown fox jumps over the lazy dog","messageEncoding":"utf8","keyHex":"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f","tagBytes":32,"customLabel":"myapi/v1/webhook"}'

Name

Type

Required

Description

message

textarea

Yes

—

messageEncoding

select

—

keyHex

text

Yes

—

tagBytes

number

—

customLabel

text

—

{ "mcpServers": { "elysiatools-hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter": { "name": "hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter", "description": "Compute and audit MACs across HMAC-SHA-2/SHA-3, keyed BLAKE2, BLAKE3, KMAC and Poly1305 with official known-answer self-tests, key/tag-length linting and a cross-construction compatibility matrix.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "hmac-blake3-sha3-keccak-keyed-hash-and-mac-construction-linter", "arguments": { "message": "The quick brown fox jumps over the lazy dog", "messageEncoding": "utf8", "keyHex": "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", "tagBytes": 32, "customLabel": "myapi/v1/webhook" } } }