CBOR decoding and encoding?
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Description
### New API Proposal:CBOR Encoding/Decoding
#### Motivation:
A lot of WebAuthn and Apple attestation and passkey APIs depend on [CBOR](https://datatracker.ietf.org/doc/html/rfc7049) encoding of attestation. I think it makes sense to have a thorough and vetted implementation of code to encode and decode the format.
#### Importance:
As an example, implementing the server side of App Attestation requires decoding a CBOR: https://developer.apple.com/documentation/devicecheck/validating-apps-that-connect-to-your-server
#### Alternatives
At least [one](https://github.com/valpackett/SwiftCBOR) third-party implementation exists, but this seems to me like a reasonable addition to CryptoKit.
Contributor guide
Research direction
The issue names no repository files or tests. Start by reviewing RFC 7049 and Apple's app-attestation documentation, then compare the SwiftCBOR alternative; done would require an agreed, vetted CBOR encoding and decoding API for swift-crypto.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- swift
- Domain
- cryptography, security
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100