Update test vectors for BBS Signature Scheme version 05

[Wind4Greg]

This PR updates the test vectors based on the latest release of the draft BBS specification draft-irtf-cfrg-bbs-signatures-05.

Note that the proof generation/verification procedure has been updated in this version. Test vectors are informative but very helpful to developers. Also the text accompanying the test vectors has not changed only the computed values.

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[dlongley]

+1 to getting these in. Thanks!

[Wind4Greg]

Folks, these test vectors have been updated to include the changes requested in issues: #118, #122, #125, and #126.

These changes are implemented in PRs: #128, #129, and #131.

@TallTed there is some new text at the beginning of section A.2 Derived Proof. Other than that all the changes are in the test vector data.

For those interested the code for generating the test vectors can be found in https://github.com/Wind4Greg/ECDSA-SD-TestVectors/tree/main/BBS. Let me know if you have any issues with generating/validating these!

[dlongley]

I'll be trying these against DB's implementation when I get a chance. Thanks!

[dlongley]

I checked some of these test vectors successfully against DB's implementation. The only hang up was with the CBOR serialization of byte strings and I've filed an issue related to that: #134. We can merge these as-is and update after that issue is resolved or wait for it -- I'm ok either way.

[Wind4Greg]

Folks (@dlongley, @TallTed ), the base example credential was missing the required issuer property. I updated the examples to make sure all credentials produced include this required property.

[Wind4Greg]

Informative, multiple reviews, changes requested and made, no objections, merging.