Add Koblitz ECDSA Recovery Cryptosuite

[clehner]

I'd like to offer this cryptosuite for recoverable ECDSA signatures as a possible input document in the purview of the WG: https://github.com/decentralized-identity/EcdsaSecp256k1RecoverySignature2020

The "Public Key Recovery Operation" is described in section 4.1.6 of SEC 1 v2.0.

Sorry this is a bit late.

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[OR13]

This PR addresses a use case we have been contributing to for years, and is very much welcome... ES256K-R was originally invented by UPort, marketed as a solution for VC-JWT, but never registered with IANA or IETF.... This PR addresses that historical context and opens the door to encourage WG members to resolve these issues.

[mprorock]

Very important for us as well

[brianorwhatever]

yes, a very important signature suite lets get this in

[mirceanis]

Many thanks for this @clehner!
We should have done this years ago :)

[iherman]

The issue was discussed in a meeting on 2022-03-30

• no resolutions were taken

View the transcript

1.1. Add Koblitz ECDSA Recovery Cryptosuite (pr vc-wg-charter#105)

See github pull request vc-wg-charter#105.

Brent Zundel: This was raised by cel , can you talk us through it. (Charles Lehner).

Charles Lehner: This adds Koblitz ECDSA Recovery Cryptosuite.
… It's similar to other mentioned suites for other algorithms.
… It's JWS based with detached mode. Incorporates new unregistered JWA. This is at DIF.

Michael Prorock: See EcdsaSecp256k1RecoverySignature2020.

Manu Sporny: +1 to this. Supportive of this.
… At some point we need to understand by which DIF releases these specs, so that this WG can pick it up and use it.
… I hope the group that creates it operates in W3C mode, not sure if we have ever handed over a spec from DIF.

Manu Sporny: I don't anticipate it being a problem either, we just need to have an answer for W3C legal.

Brent Zundel: There is an Apache license on the repo. I agree we need to interact with DIF to more formally handle it. I don't anticipate a problem considering the license.
… This PR had positive feedback. Anyone opposed to merging it?
… Hearing no opposition, will merge it.