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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package merklesignature
import (
"encoding/json"
"fmt"
"os"
"testing"
"github.com/stretchr/testify/require"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/protocol"
"github.com/algorand/go-algorand/test/partitiontest"
)
type mssKat struct {
PublicKey []byte
KeyLifetime uint64
CtSignature []byte
EphemeralKey []byte
VcIndex uint64
CorrespondingRound uint64
ProofDepth uint8
ProofBytes []byte
Message []byte
}
func extractMssSignatureParts(signature Signature) ([]byte, []byte, []byte, uint8, error) {
ctSignature, err := signature.Signature.GetFixedLengthHashableRepresentation()
if err != nil {
return nil, nil, nil, 0, err
}
pk := signature.VerifyingKey.GetFixedLengthHashableRepresentation()
proof := signature.Proof.GetFixedLengthHashableRepresentation()
proofDepth := proof[0]
proof = proof[1:]
return ctSignature, pk, proof, proofDepth, nil
}
func generateMssKat(startRound, atRound, numOfKeys uint64, messageToSign []byte) (mssKat, error) {
if startRound > atRound {
return mssKat{}, fmt.Errorf("error: Signature round cann't be smaller then start round")
}
interval := config.Consensus[protocol.ConsensusCurrentVersion].StateProofInterval
stateProofSecrets, err := New(startRound, startRound+(interval*numOfKeys)-1, interval)
if err != nil {
return mssKat{}, fmt.Errorf("error: %w", err)
}
keyForRound := stateProofSecrets.GetSigner(atRound)
if keyForRound == nil {
return mssKat{}, fmt.Errorf("error: There is no key for round %d", atRound)
}
signature, err := keyForRound.SignBytes(messageToSign)
if err != nil {
return mssKat{}, fmt.Errorf("error while formating mss signature %w", err)
}
verifier := stateProofSecrets.GetVerifier()
ctSignature, pk, proof, proofDepth, err := extractMssSignatureParts(signature)
if err != nil {
return mssKat{}, fmt.Errorf("error while formating mss signature %w", err)
}
return mssKat{
PublicKey: verifier.Commitment[:],
KeyLifetime: KeyLifetimeDefault,
CtSignature: ctSignature,
EphemeralKey: pk,
VcIndex: signature.VectorCommitmentIndex,
CorrespondingRound: atRound,
ProofDepth: proofDepth,
ProofBytes: proof,
Message: messageToSign}, nil
}
func TestGenerateKat(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
// This test produces MSS samples for the SNARK verifier.
// it will only run explicitly by:
//
// GEN_KATS=x go test -v . -run=GenerateKat -count=1
if os.Getenv("GEN_KATS") == "" {
t.Skip("Skipping; GEN_KATS not set")
}
kat, err := generateMssKat(256, 512, 9, []byte("test"))
a.NoError(err)
katAsJSON, err := json.MarshalIndent(kat, "", "\t")
a.NoError(err)
fmt.Println(string(katAsJSON))
}
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