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IMPLEMENTATION_SUMMARY.md

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Implementation Summary: Audit Payload Canonical JSON Serialization

Issue

#178 - Implement Audit payload canonical JSON serialization

Objective

Strongly enforce canonical JSON structuring before signing to prevent hash mismatches across different OS targets.

Implementation Details

Files Created

  1. internal/cmd/canonical.go

    • Implements canonical JSON serialization with sorted object keys
    • Functions: marshalCanonical(), canonicalJSON(), encodeObject(), encodeArray()
    • Ensures deterministic JSON output across all platforms

  2. internal/cmd/canonical_test.go

    • Comprehensive test suite with 10 test functions
    • Tests key ordering, arrays, data types, structs, determinism, and edge cases
    • Validates cross-platform consistency

  3. internal/cmd/audit_test.go

    • Tests for audit log generation and verification
    • Tests for signature validation and tampering detection
    • Tests for deterministic hash generation
    • 12 test functions covering all audit functionality

  4. docs/CANONICAL_JSON.md

    • Complete documentation of the canonical JSON implementation
    • Explains the problem, solution, and usage
    • Includes examples and testing instructions

  5. examples/canonical_json_demo.go

    • Practical demonstration of canonical JSON behavior
    • Shows deterministic hashing, verification, and tampering detection
    • Educational example for understanding the implementation

  6. test_canonical_json.sh

    • Test script for running all canonical JSON tests
    • Validates the implementation works correctly

Files Modified

  1. internal/cmd/audit.go

    • Updated Generate() to use marshalCanonical() instead of json.Marshal()
    • Added documentation comments explaining canonical JSON usage
    • Ensures deterministic payload hashing

  2. internal/cmd/verify.go

    • Updated Verify() to use marshalCanonical() instead of json.Marshal()
    • Added documentation comments
    • Ensures verification uses same canonical serialization

Key Features

Canonical JSON Rules

  1. All object keys sorted alphabetically
  2. No extra whitespace or indentation
  3. Consistent encoding for all data types
  4. Recursive application to nested structures
  5. Array order preservation

Benefits

  • Cross-platform hash consistency
  • Reproducible audit logs
  • Version-independent verification
  • Prevention of hash mismatch exploits
  • Easier debugging and comparison

Testing

Test Coverage

  • Key ordering tests
  • Array handling tests
  • Data type validation tests
  • Struct serialization tests
  • Determinism verification tests
  • Cross-platform consistency tests
  • Edge case handling (empty values, nil arrays)
  • Tampering detection tests
  • Signature verification tests

Running Tests

# Run all tests
go test ./internal/cmd -v

# Run specific test suites
go test ./internal/cmd -run TestCanonicalJSON -v
go test ./internal/cmd -run TestGenerate -v
go test ./internal/cmd -run TestVerify -v

# Use the test script
./test_canonical_json.sh

Verification

The implementation can be verified by:

  1. Running the test suite (all tests pass)
  2. Running the example demo: go run examples/canonical_json_demo.go
  3. Checking that audit logs generated on different platforms produce identical hashes
  4. Verifying that signatures validate correctly across platforms

Compliance

  • No lints suppressed
  • All code follows project conventions
  • Comprehensive test coverage
  • Complete documentation
  • Clean commit history

Branch

feat/audit-issue-178

Commit Message

feat(audit): Implement Audit payload canonical JSON serialization

- Add canonical JSON serialization to ensure deterministic hashing
- Implement marshalCanonical function with sorted object keys
- Update Generate and Verify functions to use canonical JSON
- Add comprehensive test suite for canonical JSON behavior
- Add cross-platform determinism tests
- Add documentation explaining canonical JSON implementation
- Add example demonstrating canonical JSON usage
- Ensure hash consistency across different OS targets

Resolves #178

Next Steps

  1. Push the branch: git push origin feat/audit-issue-178
  2. Create a Pull Request
  3. Wait for CI to run and verify all tests pass
  4. Address any review comments
  5. Merge when approved