Add support for verifying base proof

[Tschuck]

When trying to verify credentials with base proof created using the ecdsa-sd-2023-cryptosuite library, verification fails because only derived proofs can be verified. Since the proof.cryptosuite of the base proof is already ecdsa-sd-2023, it would be beneficial to use the same library for verifying both the base proof and the derived proof.

This pull request (PR) splits the _createBaseProofVerifyData function into two parts: one for base proofs and one for derived proofs.

Details

• Added new functions to lib/proofValue.js:

  • checkForValidProof: Checks if proofValue is a string and ensures it is base64url encoded.
  • isBaseProofValue
  • isDerivedProofValue

• Added new functions to lib/verify:

  • _createVerifyData: Uses isBaseProofValue and isDerivedProofValue to call either _createBaseProofVerifyData or _createDerivedProofVerifyData.
  • _createBaseProofVerifyData: Parses the base proof value and determines required and non-required n-quads.
  • _createDerivedProofVerifyData: Original verify function.

• Adjusted tests to accommodate changes.

Questions

I hope these changes align with the interests of the repository. Please let me know if you need any further adjustments.

[dlongley]

Thank you! We'll take a look at this. We might merge it into another branch and make some stylistic tweaks. We might also make it so that you have to call a new function createConfirmCryptosuite (instead of createVerifyCryptosuite to clearly differentiate between something that will accept a base proof from something that will accept a derived one.

[Tschuck]

Perfect, thanks! Looking forward to it :)

[dlongley]

@Tschuck, version 3.4 has been released that exposes createConfirmCryptosuite() which can be used to confirm a base proof.

[Tschuck]

Works well, thanks! :)