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crypto/bulletproof/range_verifier_test.go

@@ -0,0 +1,87 @@
+package bulletproof
+
+import (
+	crand "crypto/rand"
+	"testing"
+
+	"github.com/gtank/merlin"
+	"github.com/stretchr/testify/require"
+
+	"github.com/onsonr/hway/crypto/core/curves"
+)
+
+func TestRangeVerifyHappyPath(t *testing.T) {
+	curve := curves.ED25519()
+	n := 256
+	prover, err := NewRangeProver(n, []byte("rangeDomain"), []byte("ippDomain"), *curve)
+	require.NoError(t, err)
+	v := curve.Scalar.Random(crand.Reader)
+	gamma := curve.Scalar.Random(crand.Reader)
+	g := curve.Point.Random(crand.Reader)
+	h := curve.Point.Random(crand.Reader)
+	u := curve.Point.Random(crand.Reader)
+	proofGenerators := RangeProofGenerators{
+		g: g,
+		h: h,
+		u: u,
+	}
+	transcript := merlin.NewTranscript("test")
+	proof, err := prover.Prove(v, gamma, n, proofGenerators, transcript)
+	require.NoError(t, err)
+
+	verifier, err := NewRangeVerifier(n, []byte("rangeDomain"), []byte("ippDomain"), *curve)
+	require.NoError(t, err)
+	transcriptVerifier := merlin.NewTranscript("test")
+	capV := getcapV(v, gamma, g, h)
+	verified, err := verifier.Verify(proof, capV, proofGenerators, n, transcriptVerifier)
+	require.NoError(t, err)
+	require.True(t, verified)
+}
+
+func TestRangeVerifyNotInRange(t *testing.T) {
+	curve := curves.ED25519()
+	n := 2
+	prover, err := NewRangeProver(n, []byte("rangeDomain"), []byte("ippDomain"), *curve)
+	require.NoError(t, err)
+	v := curve.Scalar.Random(crand.Reader)
+	gamma := curve.Scalar.Random(crand.Reader)
+	g := curve.Point.Random(crand.Reader)
+	h := curve.Point.Random(crand.Reader)
+	u := curve.Point.Random(crand.Reader)
+	proofGenerators := RangeProofGenerators{
+		g: g,
+		h: h,
+		u: u,
+	}
+	transcript := merlin.NewTranscript("test")
+	_, err = prover.Prove(v, gamma, n, proofGenerators, transcript)
+	require.Error(t, err)
+}
+
+func TestRangeVerifyNonRandom(t *testing.T) {
+	curve := curves.ED25519()
+	n := 2
+	prover, err := NewRangeProver(n, []byte("rangeDomain"), []byte("ippDomain"), *curve)
+	require.NoError(t, err)
+	v := curve.Scalar.One()
+	gamma := curve.Scalar.Random(crand.Reader)
+	g := curve.Point.Random(crand.Reader)
+	h := curve.Point.Random(crand.Reader)
+	u := curve.Point.Random(crand.Reader)
+	proofGenerators := RangeProofGenerators{
+		g: g,
+		h: h,
+		u: u,
+	}
+	transcript := merlin.NewTranscript("test")
+	proof, err := prover.Prove(v, gamma, n, proofGenerators, transcript)
+	require.NoError(t, err)
+
+	verifier, err := NewRangeVerifier(n, []byte("rangeDomain"), []byte("ippDomain"), *curve)
+	require.NoError(t, err)
+	transcriptVerifier := merlin.NewTranscript("test")
+	capV := getcapV(v, gamma, g, h)
+	verified, err := verifier.Verify(proof, capV, proofGenerators, n, transcriptVerifier)
+	require.NoError(t, err)
+	require.True(t, verified)
+}