Implement Google/Apple file and protocol specs

[pithumke]

Summary:

• Updated "external" protocols to latest Google/Apple spec
• Updated existing code base accordingly
• Implemented new signing and "zipping" behavior

Open TODOs:

• Update submission service
• Write unit tests
  • Measure test coverage #208
• Externalize strings and configurable properties
  • Externalize strings and configuration properties #207
• Update signature algorithm
  • Update signature algorithm to SHA-256 + ECDSA P-256 #205
• Add correct signature algorithm/app package names
  • Use correct app packages and algorithm names in SignatureInfo #206
• Re-activate batching (currently everything just put into one batch)
  • Re-introduce batching for diagnosis key packages #204
• Align REST API with Google/Apple spec (and update OpenAPI file)
  • Align CWA API to Google/Apple spec #203

Closes:

• Implement final Google/Apple server API and file specifications #168
• Decouple Writable, Directory and File interfaces from disk IO #87

Sorry for the large PR 🙈

[pithumke]

Opened new issues for the open TODOs (see PR description). Will resolve those in follow-up PRs (otherwise this one will get even bigger than it already is).

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
42 Code Smells

85.2% Coverage
0.0% Duplication

[michael-burwig]

🧇