Security
SP 800-56C HKDF Extract and Expand Walkthrough
Show each HMAC step of HKDF Extract+Expand for protocol key derivation, including PRK, T(n), and OKM.
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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/sp800-56c-hkdf-extract-and-expand-walkthrough' \
-H 'Content-Type: application/json' \
-d '{"preset":"rfc5869","hash":"sha256","encoding":"hex","ikm":"Hex, text, or Base64 according to input encoding","salt":"Optional; empty uses a zero-filled HashLen salt","info":"Optional context / protocol label","length":42}'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/sp800-56c-hkdf-extract-and-expand-walkthroughParameters
| Name | Type | Required | Description |
|---|---|---|---|
| preset | select | No | — |
| hash | select | No | — |
| encoding | select | No | — |
| ikm | textarea | No | — |
| salt | textarea | No | — |
| info |
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-sp800-56c-hkdf-extract-and-expand-walkthrough": {
"name": "sp800-56c-hkdf-extract-and-expand-walkthrough",
"description": "Show each HMAC step of HKDF Extract+Expand for protocol key derivation, including PRK, T(n), and OKM.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=sp800-56c-hkdf-extract-and-expand-walkthrough",
"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": "sp800-56c-hkdf-extract-and-expand-walkthrough",
"arguments": {
"preset": "rfc5869",
"hash": "sha256",
"encoding": "hex",
"ikm": "Hex, text, or Base64 according to input encoding",
"salt": "Optional; empty uses a zero-filled HashLen salt",
"info": "Optional context / protocol label",
"length": 42
}
}
}Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).