Esempio n. 1
0
        public void ConvertBackAndForth()
        {
            var converter = new UnblindedSignatureJsonConverter();
            var r         = new Key();
            var key       = new Key();
            var signer    = new SchnorrBlinding.Signer(key, r);

            foreach (var i in Enumerable.Range(0, 100))
            {
                var requester = new SchnorrBlinding.Requester();

                var message = new byte[256];
                Random.NextBytes(message);
                var blindedMessage     = requester.BlindMessage(message, r.PubKey, key.PubKey);
                var blindSignature     = signer.Sign(blindedMessage);
                var unblindedSignature = requester.UnblindSignature(blindSignature);

                var sb = new StringBuilder();
                using var writer = new JsonTextWriter(new StringWriter(sb));
                converter.WriteJson(writer, unblindedSignature, null);

                using var reader = new JsonTextReader(new StringReader(sb.ToString()));
                var convertedUnblindedSignature = (UnblindedSignature)converter.ReadJson(reader, null, null, null);
                Assert.Equal(unblindedSignature.C, convertedUnblindedSignature.C);
                Assert.Equal(unblindedSignature.S, convertedUnblindedSignature.S);
            }
        }
Esempio n. 2
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        public void CanParseUnblindedSignature()
        {
            var requester = new SchnorrBlinding.Requester();
            var r         = new Key(Encoders.Hex.DecodeData("31E151628AED2A6ABF7155809CF4F3C762E7160F38B4DA56B784D9045190CFA0"));
            var key       = new Key(Encoders.Hex.DecodeData("B7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF"));
            var signer    = new SchnorrBlinding.Signer(key, r);

            var message            = new uint256(Encoders.Hex.DecodeData("243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89"), false);
            var blindedMessage     = requester.BlindMessage(message, r.PubKey, key.PubKey);
            var blindSignature     = signer.Sign(blindedMessage);
            var unblindedSignature = requester.UnblindSignature(blindSignature);

            var str = unblindedSignature.ToString();

            Assert.True(UnblindedSignature.TryParse(str, out var unblindedSignature2));
            Assert.Equal(unblindedSignature.C, unblindedSignature2.C);
            Assert.Equal(unblindedSignature.S, unblindedSignature2.S);
            str += "o";
            Assert.False(UnblindedSignature.TryParse(str, out _));
            Assert.Throws <FormatException>(() => UnblindedSignature.Parse(str));
            byte[] overflow = new byte[64];
            overflow.AsSpan().Fill(255);
            Assert.False(UnblindedSignature.TryParse(overflow, out _));
            Assert.Throws <FormatException>(() => UnblindedSignature.Parse(overflow));
        }
Esempio n. 3
0
        static void Main(string[] args)
        {
            var requester = new SchnorrBlinding.Requester();
            var r         = new Key(Encoders.Hex.DecodeData("31E151628AED2A6ABF7155809CF4F3C762E7160F38B4DA56B784D9045190CFA0"));
            var key       = new Key(Encoders.Hex.DecodeData("B7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF"));
            var message   = new uint256(Encoders.Hex.DecodeData("243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89"));

            switch (args[0])
            {
            case "blind-verify":
                var blindedMessage = requester.BlindMessage(message, r.PubKey, key.PubKey);

                Console.WriteLine(blindedMessage);

                var blindedSignatureInput = Console.ReadLine();
                var blindedSignature2     = uint256.Parse(blindedSignatureInput);
                var unblindedSignature    = requester.UnblindSignature(blindedSignature2);
                var success = SchnorrBlinding.VerifySignature(message, unblindedSignature, key.PubKey);
                Console.WriteLine(success);
                return;

            case "sign":
                var signer = new SchnorrBlinding.Signer(key, r);
                var blindedMessageInput = Console.ReadLine();
                var blindedMessage2     = uint256.Parse(blindedMessageInput);
                var blindSignature      = signer.Sign(blindedMessage2);
                Console.WriteLine(blindSignature);
                return;
            }
        }
Esempio n. 4
0
        public void BlindingSignature()
        {
            // Test with known values
            var requester = new SchnorrBlinding.Requester();
            var r         = new Key(Encoders.Hex.DecodeData("31E151628AED2A6ABF7155809CF4F3C762E7160F38B4DA56B784D9045190CFA0"));
            var key       = new Key(Encoders.Hex.DecodeData("B7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF"));
            var signer    = new SchnorrBlinding.Signer(key, r);

            var message            = new uint256(Encoders.Hex.DecodeData("243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89"), false);
            var blindedMessage     = requester.BlindMessage(message, r.PubKey, key.PubKey);
            var blindSignature     = signer.Sign(blindedMessage);
            var unblindedSignature = requester.UnblindSignature(blindSignature);

            Assert.True(SchnorrBlinding.VerifySignature(message, unblindedSignature, key.PubKey));
            Assert.False(SchnorrBlinding.VerifySignature(uint256.Zero, unblindedSignature, key.PubKey));
            Assert.False(SchnorrBlinding.VerifySignature(uint256.One, unblindedSignature, key.PubKey));

            // Test with unknown values
            requester = new SchnorrBlinding.Requester();
            signer    = new SchnorrBlinding.Signer(new Key(), new Key());

            message        = NBitcoin.Crypto.Hashes.Hash256(Encoders.ASCII.DecodeData("Hello world!"));
            blindedMessage = requester.BlindMessage(message, signer.R.PubKey, signer.Key.PubKey);

            blindSignature     = signer.Sign(blindedMessage);
            unblindedSignature = requester.UnblindSignature(blindSignature);
            Assert.True(SchnorrBlinding.VerifySignature(message, unblindedSignature, signer.Key.PubKey));
            Assert.False(SchnorrBlinding.VerifySignature(uint256.One, unblindedSignature, signer.Key.PubKey));
            Assert.False(SchnorrBlinding.VerifySignature(uint256.One, unblindedSignature, signer.Key.PubKey));
            var newMessage = Encoders.ASCII.DecodeData("Hello, World!");

            for (var i = 0; i < 1_000; i++)
            {
                requester          = new SchnorrBlinding.Requester();
                signer             = new SchnorrBlinding.Signer(new Key());
                blindedMessage     = requester.BlindMessage(newMessage, signer.R.PubKey, signer.Key.PubKey);
                blindSignature     = signer.Sign(blindedMessage);
                unblindedSignature = requester.UnblindSignature(blindSignature);

                Assert.True(signer.VerifyUnblindedSignature(unblindedSignature, newMessage));
            }

            var ex = Assert.Throws <ArgumentException>(() => signer.Sign(uint256.Zero));

            Assert.StartsWith("Invalid blinded message.", ex.Message);
        }