This is a small utility to help generate test cases for github.com/veraison/corim. It compiles YAML documents into CBOR. In general YAML structures are converted into corresponding CBOR structures with two exceptions:

• A map with exactly two keys, "tag" and "value", is converted into a CBOR tag, where the value of "tag" is used as the tag number (it must be an int), and the value of "value" is the tagged structure.
• A map with exactly one key, "encodedCBOR" is converted into a binary string, the contents of which is the CBOR-encoded structure corresponding to that key.

This tool is almost compatible with the output of cbor2yaml.rb from cbor-diag, with the exception that the application-specific !binary YAML tags generated by the that tool need to be replaced with the global !!binary tags in order to work.

For example, to generate input YAML for this tool from an existing CBOR document, you can:

cbor2yaml.rb /path/to/document.cbor | sed 's/!binary/!!binary/g' > document.yaml

(assuming you have cbor-diag tools installed).

Note

While this can be used as a generic tool for compiling YAML into CBOR, it was specifically designed to help generate test cases for corim library, and its general usefulness outside that was not a consideration.

Installation

go install github.com/setrofim/gen-testcase@latest

Usage

gen-testcase samples/corim-full.yaml -o /tmp/unsigned-corim.cbor

see output of gen-testcase -h for all options.

COSE_Sign1

In addition to generating a CBOR document, this tool can optionally wrap it in a COSE_Sign1 message. This is done by specifying a signing key with -s/--signing-key option. The key must be in JWK format. The content type header is set to application/rim+cbor, but an alternative may be specified with -c/--content-type option. Finally, additional arbitrary data maybe encoded and included in the protected header under the label 8 with -m/--meta option.

gen-testcase -s samples/ec-p256.jwk -m samples/meta.yaml \
        samples/corim.yaml -o /tmp/signed-corim.cbor