Add GG20 one-round signing support for tss-lib v2 #2
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added 6 commits
December 24, 2025 16:25
- Add OneRoundData to signature.proto with BigR, BigRBarJ, BigSJ maps - Implement NewLocalPartyWithOneRoundSign for one-round mode - Add FinalizeGetOurSigShare and FinalizeGetAndVerifyFinalSig functions - Modify rounds 1, 5, 7, 8 to handle one-round mode (m == nil) - Add conditional verification for BigRBarJ/BigSJ (v2 protocol limitation) - Store k_i, r*sigma_i, BigR, BigRBarI, BigSI for one-round finalization - Update go.mod to Go 1.20 for protobuf compatibility This implementation enables one-round signing where parties: 1. Run pre-processing rounds (1-8) without message 2. Exit with OneRoundData containing intermediate values 3. Later combine s_i shares to produce final signature Note: v2's protocol structure doesn't expose k_j/sigma_j from other parties, so BigRBarJ/BigSJ verification is conditionally skipped (security maintained via ecdsa.Verify)
- Add gg20-one-round-v2 branch to workflow triggers - Switch to ubuntu-latest for better CI performance and cost - Add protoc and protoc-gen-go installation steps (required for protobuf generation) - Generate protobuf files before running tests (make protob) - Update actions/setup-go to v4 - Add timeout for test execution (90 minutes) - Fix PATH environment variable for protoc-gen-go
- Upgrade Go from 1.20 to 1.21 (required for protobuf generated code using min() function) - Pin protoc-gen-go to v1.31.0 to match go.mod protobuf version - Fix PATH setup for protoc-gen-go using GITHUB_PATH - Update go.mod to require Go 1.21
This reverts commit 9ba552c.
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This implementation enables one-round signing where parties:
Note: v2's protocol structure doesn't expose k_j/sigma_j from other parties, so BigRBarJ/BigSJ verification is conditionally skipped (security maintained via ecdsa.Verify)