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tecdsa/dklsv1/dealer/dealer.go

@@ -0,0 +1,87 @@
+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+// Package dealer implements key generation via a trusted dealer for the protocol [DKLs18](https://eprint.iacr.org/2018/499.pdf).
+// The trusted dealer produces the same output as the corresponding DKG protocol and can be used for signing without
+// additional modifications.
+// Note that running actual DKG is ALWAYS recommended over a trusted dealer.
+package dealer
+
+import (
+	"crypto/rand"
+
+	"github.com/pkg/errors"
+
+	"github.com/sonr-io/sonr/crypto/core/curves"
+	"github.com/sonr-io/sonr/crypto/ot/base/simplest"
+	"github.com/sonr-io/sonr/crypto/ot/extension/kos"
+	"github.com/sonr-io/sonr/crypto/tecdsa/dklsv1/dkg"
+)
+
+// GenerateAndDeal produces private key material for alice and bob which they can later use in signing.
+// Running actual DKG is ALWAYS recommended over using this function, as this function breaks the security guarantees of DKG.
+// only use this function if you have a very good reason to.
+func GenerateAndDeal(curve *curves.Curve) (*dkg.AliceOutput, *dkg.BobOutput, error) {
+	aliceSecretShare, bobSecretShare, publicKey := produceKeyShares(curve)
+	aliceOTOutput, bobOTOutput, err := produceOTResults(curve)
+	if err != nil {
+		return nil, nil, errors.Wrap(err, "couldn't produce OT results")
+	}
+	alice := &dkg.AliceOutput{
+		PublicKey:      publicKey,
+		SecretKeyShare: aliceSecretShare,
+		SeedOtResult:   aliceOTOutput,
+	}
+	bob := &dkg.BobOutput{
+		PublicKey:      publicKey,
+		SecretKeyShare: bobSecretShare,
+		SeedOtResult:   bobOTOutput,
+	}
+	return alice, bob, nil
+}
+
+func produceKeyShares(
+	curve *curves.Curve,
+) (aliceSecretShare curves.Scalar, bobSecretShare curves.Scalar, publicKey curves.Point) {
+	aliceSecretShare = curve.Scalar.Random(rand.Reader)
+	bobSecretShare = curve.Scalar.Random(rand.Reader)
+	publicKey = curve.ScalarBaseMult(aliceSecretShare.Mul(bobSecretShare))
+	return aliceSecretShare, bobSecretShare, publicKey
+}
+
+func produceOTResults(
+	curve *curves.Curve,
+) (*simplest.ReceiverOutput, *simplest.SenderOutput, error) {
+	oneTimePadEncryptionKeys := make([]simplest.OneTimePadEncryptionKeys, kos.Kappa)
+	oneTimePadDecryptionKey := make([]simplest.OneTimePadDecryptionKey, kos.Kappa)
+
+	// we'll need a receiver because in its constructor random bits will be selected.
+	receiver, err := simplest.NewReceiver(curve, kos.Kappa, [simplest.DigestSize]byte{})
+	if err != nil {
+		return nil, nil, errors.Wrap(err, "couldn't initialize a receiver")
+	}
+	packedRandomChoiceBits, randomChoiceBits := receiver.Output.PackedRandomChoiceBits, receiver.Output.RandomChoiceBits
+
+	for i := 0; i < kos.Kappa; i++ {
+		if _, err := rand.Read(oneTimePadEncryptionKeys[i][0][:]); err != nil {
+			return nil, nil, errors.WithStack(err)
+		}
+		if _, err := rand.Read(oneTimePadEncryptionKeys[i][1][:]); err != nil {
+			return nil, nil, errors.WithStack(err)
+		}
+		oneTimePadDecryptionKey[i] = oneTimePadEncryptionKeys[i][randomChoiceBits[i]]
+	}
+
+	senderOutput := &simplest.SenderOutput{
+		OneTimePadEncryptionKeys: oneTimePadEncryptionKeys,
+	}
+	receiverOutput := &simplest.ReceiverOutput{
+		PackedRandomChoiceBits:  packedRandomChoiceBits,
+		RandomChoiceBits:        randomChoiceBits,
+		OneTimePadDecryptionKey: oneTimePadDecryptionKey,
+	}
+	return receiverOutput, senderOutput, nil
+}

tecdsa/dklsv1/dealer/dealer_test.go

@@ -0,0 +1,57 @@
+package dealer_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/crypto/sha3"
+
+	"github.com/sonr-io/sonr/crypto/core/curves"
+	"github.com/sonr-io/sonr/crypto/tecdsa/dklsv1/dealer"
+	"github.com/sonr-io/sonr/crypto/tecdsa/dklsv1/sign"
+)
+
+func Test_DealerCanGenerateKeysThatSign(t *testing.T) {
+	curveInstances := []*curves.Curve{
+		curves.K256(),
+		curves.P256(),
+	}
+	for _, curve := range curveInstances {
+		aliceOutput, bobOutput, err := dealer.GenerateAndDeal(curve)
+		require.NoError(t, err)
+
+		alice := sign.NewAlice(curve, sha3.New256(), aliceOutput)
+		bob := sign.NewBob(curve, sha3.New256(), bobOutput)
+
+		message := []byte("A message.")
+		seed, err := alice.Round1GenerateRandomSeed()
+		require.NoError(t, err)
+		round3Output, err := bob.Round2Initialize(seed)
+		require.NoError(t, err)
+		round4Output, err := alice.Round3Sign(message, round3Output)
+		require.NoError(t, err)
+		err = bob.Round4Final(message, round4Output)
+		require.NoError(t, err, "curve: %s", curve.Name)
+	}
+}
+
+func Test_DealerGeneratesDifferentResultsEachTime(t *testing.T) {
+	curve := curves.K256()
+	aliceOutput1, bobOutput1, err := dealer.GenerateAndDeal(curve)
+	require.NoError(t, err)
+	aliceOutput2, bobOutput2, err := dealer.GenerateAndDeal(curve)
+	require.NoError(t, err)
+
+	require.NotEqual(t, aliceOutput1.SecretKeyShare, aliceOutput2.SecretKeyShare)
+	require.NotEqual(t, bobOutput1.SecretKeyShare, bobOutput2.SecretKeyShare)
+	require.NotEqualValues(
+		t,
+		aliceOutput1.SeedOtResult.RandomChoiceBits,
+		aliceOutput2.SeedOtResult.RandomChoiceBits,
+	)
+	require.NotEqualValues(
+		t,
+		bobOutput1.SeedOtResult.OneTimePadEncryptionKeys,
+		bobOutput2.SeedOtResult.OneTimePadEncryptionKeys,
+	)
+}