"Verification failed" after adding AppParams

[justincpresley]

After playing around with the schema-based examples, I found a situation where verification fails.

Go version: 1.21.1 + 1.20.8 (tested both)
Example: Schema-based Single Packet

Changing this line to be the following:
result := <-mNode.Call("NeedChan", enc.Wire{prefix.Bytes()}).(chan schema.NeedResult)
i.e. adding AppParams to the interest (the prefix name in this case for simplicity).

This results in the attached error.

I assume the schema needs to be changed to state there is parameters added to the interest? Yet after looking through the codebase including the svs example that also signs the interest, I do not see any option. Am I missing something?

[zjkmxy]

An Interest with AppParam must be signed. However, current NTSchema does not automatically signs the Interest.
The SVS example specifies a signer as:

go-ndn/examples/schema-test/sync/schema.json

Lines 37 to 41 in 2e42d59

	"type": "FixedHmacIntSigner",
	"path": "/sync/32=notif",
	"attrs": {
	"KeyValue": "$hmacKey"
	}

[justincpresley]

That makes sense. It's good it doesn't just let me use the Sha256Signer for security reasons.
Okay, I suppose Hmac can work for rough testing the functionality of an app.
Thank you!