Canonicalizes device_id, nonce and message, computes an HMAC-SHA256 tag with cal
Canonicalizes device_id, nonce and message, computes an HMAC-SHA256 tag with caller-supplied ephemeral key material, and optionally compares a claimed tag in constant time. It does not provision devices, store keys or replace asymmetric device identity; do not submit long-lived production secrets.
Not tested: has real-world effectsour last check, 2026-09-24
0 of 0checks answered this week
n/amedian answer time
$0.002listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://iot.halowerk.com/v1/device-auth
| Category | Commerce and shopping |
|---|---|
| Provider host | iot.halowerk.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"device_id": "sensor-berlin-17",
"ephemeral_key": "example-ephemeral-key-2026",
"message": "boot:4.2.1",
"nonce": "20260831-0001"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"claimed_tag_hex": {
"pattern": "^[0-9a-fA-F]{64}$",
"type": "string"
},
"device_id": {
"description": "Stable device identifier.",
"maxLength": 128,
"minLength": 1,
"type": "string"
},
"ephemeral_key": {
"description": "Ephemeral HMAC key; long-lived production keys must not be sent.",
"maxLength": 512,
"minLength": 16,
"type": "string"
},
"message": {
"description": "Challenge payload.",
"maxLength": 4096,
"minLength": 1,
"type": "string"
},
"nonce": {
"description": "Fresh caller-generated challenge nonce.",
"maxLength": 256,
"minLength": 8,
"type": "string"
}
},
"required": [
"device_id",
"nonce",
"message",
"ephemeral_key"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}