# HMAC

Signs or verifies payloads with an HMAC shared secret.

## Configuration

Use sign mode to produce a signature, verify mode to check inbound provider signatures.

## Runtime output

The node writes its main result to `last_output` and, when structured, to `last_output_parsed`. Downstream nodes can reference named outputs through `{outputs.<node_id>.parsed}`.

## Example workflow

Use the workflow card below to create a working example in the editor. It uses safe sample data and avoids external side effects unless the node itself is an outbound integration.

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*Source: https://agentbuilder.systalink.sn/docs/node-hmac — human documentation.*
*Other language: [/docs-md/fr/node-hmac.md](/docs-md/fr/node-hmac.md).*
*Machine-readable index: [/llms.txt](/llms.txt).*