Ed25519/Ed25519 Tests/SignerTests.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using Ed25519;
using NUnit.Framework;

namespace Ed25519_Tests
{
    public sealed class SignerTests
    {
        [Test]
        public void TestSignatureLength()
        {
            var message = Encoding.UTF8.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signature = Signer.Sign(message, privateKey, publicKey);

            Assert.That(signature.Length, Is.EqualTo(64));
        }

        [Test]
        public void TestManipulatedPublicKey()
        {
            var message = Encoding.UTF8.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey()[2..];

            try
            {
                Signer.Sign(message, privateKey, publicKey);
                Assert.Fail("Should not be reached!");
            }
            catch (ArgumentException e)
            {
                Assert.That(true); // Public key is too short!
            }
        }

        [Test]
        public void TestSimpleMessageValidation()
        {
            var message = Encoding.UTF8.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signature = Signer.Sign(message, privateKey, publicKey);
            var validationResult = Signer.Validate(signature, message, publicKey);

            Assert.That(validationResult, Is.True);
        }

        [Test]
        public void TestSlightlyChangedMessageValidation()
        {
            var messageOriginal = Encoding.UTF8.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signature = Signer.Sign(messageOriginal, privateKey, publicKey);

            var messageAltered = Encoding.UTF8.GetBytes("This is a test message!");
            var validationResult = Signer.Validate(signature, messageAltered, publicKey);

            Assert.That(validationResult, Is.False); // Message was altered!
        }

        [Test]
        public void TestSlightlyChangedMessageDifferentSignatures()
        {
            var messageOriginal = Encoding.UTF8.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signatureOriginal = Signer.Sign(messageOriginal, privateKey, publicKey);

            var messageAltered = Encoding.UTF8.GetBytes("This is a test message!");
            var signatureAltered = Signer.Sign(messageAltered, privateKey, publicKey);

            // Two different messages must produce different signatures!
            Assert.That(signatureOriginal.ToArray(), Is.Not.EqualTo(signatureAltered.ToArray()));
        }

        [Test]
        public void TestMessageValidationWithDifferentEncodings()
        {
            var messageOriginal = Encoding.ASCII.GetBytes("This is a test message.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signatureOriginal = Signer.Sign(messageOriginal, privateKey, publicKey);

            var messageAltered = Encoding.UTF32.GetBytes("This is a test message.");
            var signatureAltered = Signer.Sign(messageAltered, privateKey, publicKey);

            // Two equal messages with different encoding must produce different signatures:
            Assert.That(signatureOriginal.ToArray(), Is.Not.EqualTo(signatureAltered.ToArray()));
        }

        [Test]
        public void TestMessageWithUmlautsAndDifferentEncodings()
        {
            var messageOriginal = Encoding.ASCII.GetBytes("This is a test message with umlauts äöü.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signatureOriginal = Signer.Sign(messageOriginal, privateKey, publicKey);

            var messageAltered = Encoding.UTF8.GetBytes("This is a test message with umlauts äöü.");
            var signatureAltered = Signer.Sign(messageAltered, privateKey, publicKey);

            // Two equal messages with different encoding must produce different signatures:
            Assert.That(signatureOriginal.ToArray(), Is.Not.EqualTo(signatureAltered.ToArray()));
        }

        [Test]
        public void TestMessageWithUmlauts()
        {
            var messageOriginal = Encoding.UTF8.GetBytes("This is a test message with umlauts äöü.");
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();
            var signatureOriginal = Signer.Sign(messageOriginal, privateKey, publicKey);

            var message2 = Encoding.UTF8.GetBytes("This is a test message with umlauts äöü.");
            var signature2 = Signer.Sign(message2, privateKey, publicKey);
            var validationResult = Signer.Validate(signatureOriginal, message2, publicKey);

            // Two equal messages must produce same signatures:
            Assert.That(signatureOriginal.ToArray(), Is.EqualTo(signature2.ToArray()));
            Assert.That(validationResult, Is.True);
        }

        [Test]
        public void TestKeyGeneratorWithoutPassword()
        {
            var privateKey = Signer.GeneratePrivateKey();
            var publicKey = privateKey.ExtractPublicKey();

            Assert.That(privateKey.Length, Is.EqualTo(32));
            Assert.That(publicKey.Length, Is.EqualTo(32));
            Assert.That(privateKey.ToArray(), Is.Not.EqualTo(publicKey.ToArray()));
        }

        [Test]
        public void TestKeyGeneratorWithPassword()
        {
            var password = "test password";
            var privateKeyEncrypted = Signer.GeneratePrivateKey(password);
            var privateKeyDecrypted = privateKeyEncrypted.DecryptPrivateKey(password);
            var publicKey = privateKeyDecrypted.ExtractPublicKey();

            Assert.That(privateKeyEncrypted.Length, Is.GreaterThan(32));
            Assert.That(privateKeyDecrypted.Length, Is.EqualTo(32));
            Assert.That(publicKey.Length, Is.EqualTo(32));
            Assert.That(privateKeyEncrypted.ToArray(), Is.Not.EqualTo(privateKeyDecrypted.ToArray()));
            Assert.That(privateKeyEncrypted.ToArray(), Is.Not.EqualTo(publicKey.ToArray()));
            Assert.That(privateKeyDecrypted.ToArray(), Is.Not.EqualTo(publicKey.ToArray()));
        }

        [Test]
        public void TestMultipleKeysWithoutPassword()
        {
            var privateKey1 = Signer.GeneratePrivateKey();
            var privateKey2 = Signer.GeneratePrivateKey();
            var privateKey3 = Signer.GeneratePrivateKey();

            Assert.That(privateKey1.ToArray(), Is.Not.EqualTo(privateKey2.ToArray()));
            Assert.That(privateKey1.ToArray(), Is.Not.EqualTo(privateKey3.ToArray()));
            Assert.That(privateKey2.ToArray(), Is.Not.EqualTo(privateKey3.ToArray()));
        }

        [Test]
        public void TestMultipleKeysWithPassword()
        {
            var password = "test password";
            var privateKey1 = Signer.GeneratePrivateKey(password);
            var privateKey2 = Signer.GeneratePrivateKey(password);
            var privateKey3 = Signer.GeneratePrivateKey(password);

            Assert.That(privateKey1.ToArray(), Is.Not.EqualTo(privateKey2.ToArray()));
            Assert.That(privateKey1.ToArray(), Is.Not.EqualTo(privateKey3.ToArray()));
            Assert.That(privateKey2.ToArray(), Is.Not.EqualTo(privateKey3.ToArray()));
        }

        [Test]
        public void TestPublicKeyFromRandomData()
        {
            var privateKey = new byte[] { 0x00, 0xac, 0x48 }.AsSpan();
            var publicKey = privateKey.ExtractPublicKey();

            Assert.That(privateKey.Length, Is.EqualTo(3));
            Assert.That(publicKey.Length, Is.EqualTo(0));
            Assert.That(publicKey.IsEmpty, Is.True);
        }

        [Test]
        public void TestWritingKeys()
        {
            var tempFilePrivate = Path.GetTempFileName();
            var tempFilePublic = Path.GetTempFileName();

            try
            {
                var privateKey = Signer.GeneratePrivateKey();
                var publicKey = privateKey.ExtractPublicKey();
                
                privateKey.WriteKey(tempFilePrivate);
                publicKey.WriteKey(tempFilePublic);

                var reloadPrivateKey = Signer.LoadKey(tempFilePrivate);
                var reloadPublicKey = Signer.LoadKey(tempFilePublic);

                Assert.That(reloadPublicKey.Length, Is.EqualTo(32));
                Assert.That(reloadPrivateKey.Length, Is.EqualTo(32));

                Assert.That(reloadPublicKey.ToArray(), Is.EqualTo(publicKey.ToArray()));
                Assert.That(reloadPrivateKey.ToArray(), Is.EqualTo(privateKey.ToArray()));
            }
            finally
            {
                File.Delete(tempFilePublic);
                File.Delete(tempFilePrivate);
            }
        }

        [Test]
        public void TestExtractPublicKeyFromEncryptedPrivateKey()
        {
            var privateKeyEncrypted = Signer.GeneratePrivateKey("secret password");
            var privateKeyDecrypted = privateKeyEncrypted.DecryptPrivateKey("secret password");
            var publicKeyFromDecrypted = privateKeyDecrypted.ExtractPublicKey();
            var publicKeyFromEncrypted = privateKeyEncrypted.ExtractPublicKey();

            Assert.That(publicKeyFromDecrypted.ToArray(), Is.Not.EqualTo(publicKeyFromEncrypted.ToArray()));
        }

        [Test]
        public void TestSigningBehaviourPrivateKeyWithPassword()
        {
            var privateKeyEncrypted = Signer.GeneratePrivateKey("secret password");
            var privateKeyDecrypted = privateKeyEncrypted.DecryptPrivateKey("secret password");
            var publicKey = privateKeyDecrypted.ExtractPublicKey();
            var message = Encoding.UTF8.GetBytes("This is a test message.");
            var signaturePrivateKeyDecrypted = Signer.Sign(message, privateKeyDecrypted, publicKey);
            var signaturePrivateKeyEncrypted = Signer.Sign(message, privateKeyEncrypted[..32], publicKey); // Note: The encrypted private key is 64 bytes long!
            var validationDecrypted = Signer.Validate(signaturePrivateKeyDecrypted, message, publicKey);
            var validationEncrypted = Signer.Validate(signaturePrivateKeyEncrypted, message, publicKey);

            Assert.That(validationDecrypted, Is.True); // This is the intended behaviour. The public key was derived from the decrypted private key.
            Assert.That(validationEncrypted, Is.False); // This should fail, because the public key does not match the *encrypted* private key!
            Assert.That(signaturePrivateKeyEncrypted.ToArray(), Is.Not.EqualTo(signaturePrivateKeyDecrypted.ToArray()));
        }

        // See https://tools.ietf.org/html/rfc8032#section-7.1
        [Test]
        public void TestRFC8032Test01EmptyMessage()
        {
            var message = new ReadOnlySpan<byte>(); // Empty message!
            var publicKey = new byte[]
            {
                0xd7, 0x5a, 0x98, 0x01, 0x82, 0xb1, 0x0a, 0xb7, 0xd5, 0x4b, 0xfe, 0xd3, 0xc9, 0x64, 0x07, 0x3a,
                0x0e, 0xe1, 0x72, 0xf3, 0xda, 0xa6, 0x23, 0x25, 0xaf, 0x02, 0x1a, 0x68, 0xf7, 0x07, 0x51, 0x1a,
            };
            
            var privateKey = new byte[]
            {
                0x9d, 0x61, 0xb1, 0x9d, 0xef, 0xfd, 0x5a, 0x60, 0xba, 0x84, 0x4a, 0xf4, 0x92, 0xec, 0x2c, 0xc4,
                0x44, 0x49, 0xc5, 0x69, 0x7b, 0x32, 0x69, 0x19, 0x70, 0x3b, 0xac, 0x03, 0x1c, 0xae, 0x7f, 0x60,
            };

            var expectedSignature = new byte[]
            {
                0xe5, 0x56, 0x43, 0x00, 0xc3, 0x60, 0xac, 0x72, 0x90, 0x86, 0xe2, 0xcc, 0x80, 0x6e, 0x82, 0x8a,
                0x84, 0x87, 0x7f, 0x1e, 0xb8, 0xe5, 0xd9, 0x74, 0xd8, 0x73, 0xe0, 0x65, 0x22, 0x49, 0x01, 0x55,
                0x5f, 0xb8, 0x82, 0x15, 0x90, 0xa3, 0x3b, 0xac, 0xc6, 0x1e, 0x39, 0x70, 0x1c, 0xf9, 0xb4, 0x6b,
                0xd2, 0x5b, 0xf5, 0xf0, 0x59, 0x5b, 0xbe, 0x24, 0x65, 0x51, 0x41, 0x43, 0x8e, 0x7a, 0x10, 0x0b,
            };

            var signature = Signer.Sign(message, privateKey, publicKey);
            Assert.That(signature.ToArray(), Is.EqualTo(expectedSignature));

            var validationResult = Signer.Validate(signature, message, publicKey);
            Assert.That(validationResult, Is.True);
        }

        // See https://tools.ietf.org/html/rfc8032#section-7.1
        [Test]
        public void TestRFC8032Test02OneByteMessage()
        {
            var message = new byte[]
            {
                0x72,
            };

            var publicKey = new byte[]
            {
                0x3d, 0x40, 0x17, 0xc3, 0xe8, 0x43, 0x89, 0x5a, 0x92, 0xb7, 0x0a, 0xa7, 0x4d, 0x1b, 0x7e, 0xbc,
                0x9c, 0x98, 0x2c, 0xcf, 0x2e, 0xc4, 0x96, 0x8c, 0xc0, 0xcd, 0x55, 0xf1, 0x2a, 0xf4, 0x66, 0x0c,
            };

            var privateKey = new byte[]
            {
                0x4c, 0xcd, 0x08, 0x9b, 0x28, 0xff, 0x96, 0xda, 0x9d, 0xb6, 0xc3, 0x46, 0xec, 0x11, 0x4e, 0x0f,
                0x5b, 0x8a, 0x31, 0x9f, 0x35, 0xab, 0xa6, 0x24, 0xda, 0x8c, 0xf6, 0xed, 0x4f, 0xb8, 0xa6, 0xfb,
            };

            var expectedSignature = new byte[]
            {
                0x92, 0xa0, 0x09, 0xa9, 0xf0, 0xd4, 0xca, 0xb8, 0x72, 0x0e, 0x82, 0x0b, 0x5f, 0x64, 0x25, 0x40,
                0xa2, 0xb2, 0x7b, 0x54, 0x16, 0x50, 0x3f, 0x8f, 0xb3, 0x76, 0x22, 0x23, 0xeb, 0xdb, 0x69, 0xda,
                0x08, 0x5a, 0xc1, 0xe4, 0x3e, 0x15, 0x99, 0x6e, 0x45, 0x8f, 0x36, 0x13, 0xd0, 0xf1, 0x1d, 0x8c,
                0x38, 0x7b, 0x2e, 0xae, 0xb4, 0x30, 0x2a, 0xee, 0xb0, 0x0d, 0x29, 0x16, 0x12, 0xbb, 0x0c, 0x00,
            };

            var signature = Signer.Sign(message, privateKey, publicKey);
            Assert.That(signature.ToArray(), Is.EqualTo(expectedSignature));

            var validationResult = Signer.Validate(signature, message, publicKey);
            Assert.That(validationResult, Is.True);
        }

        // See https://tools.ietf.org/html/rfc8032#section-7.1
        [Test]
        public void TestRFC8032Test03TwoByteMessage()
        {
            var message = new byte[]
            {
                0xaf, 0x82,
            };

            var publicKey = new byte[]
            {
                0xfc, 0x51, 0xcd, 0x8e, 0x62, 0x18, 0xa1, 0xa3, 0x8d, 0xa4, 0x7e, 0xd0, 0x02, 0x30, 0xf0, 0x58,
                0x08, 0x16, 0xed, 0x13, 0xba, 0x33, 0x03, 0xac, 0x5d, 0xeb, 0x91, 0x15, 0x48, 0x90, 0x80, 0x25,

            };

            var privateKey = new byte[]
            {
                0xc5, 0xaa, 0x8d, 0xf4, 0x3f, 0x9f, 0x83, 0x7b, 0xed, 0xb7, 0x44, 0x2f, 0x31, 0xdc, 0xb7, 0xb1,
                0x66, 0xd3, 0x85, 0x35, 0x07, 0x6f, 0x09, 0x4b, 0x85, 0xce, 0x3a, 0x2e, 0x0b, 0x44, 0x58, 0xf7,
            };

            var expectedSignature = new byte[]
            {
                0x62, 0x91, 0xd6, 0x57, 0xde, 0xec, 0x24, 0x02, 0x48, 0x27, 0xe6, 0x9c, 0x3a, 0xbe, 0x01, 0xa3,
                0x0c, 0xe5, 0x48, 0xa2, 0x84, 0x74, 0x3a, 0x44, 0x5e, 0x36, 0x80, 0xd7, 0xdb, 0x5a, 0xc3, 0xac,
                0x18, 0xff, 0x9b, 0x53, 0x8d, 0x16, 0xf2, 0x90, 0xae, 0x67, 0xf7, 0x60, 0x98, 0x4d, 0xc6, 0x59,
                0x4a, 0x7c, 0x15, 0xe9, 0x71, 0x6e, 0xd2, 0x8d, 0xc0, 0x27, 0xbe, 0xce, 0xea, 0x1e, 0xc4, 0x0a,
            };

            var signature = Signer.Sign(message, privateKey, publicKey);
            Assert.That(signature.ToArray(), Is.EqualTo(expectedSignature));

            var validationResult = Signer.Validate(signature, message, publicKey);
            Assert.That(validationResult, Is.True);
        }

        // See https://tools.ietf.org/html/rfc8032#section-7.1
        [Test]
        public void TestRFC8032Test04With1kMessage()
        {
            var message = new byte[]
            {
                0x08, 0xb8, 0xb2, 0xb7, 0x33, 0x42, 0x42, 0x43, 0x76, 0x0f, 0xe4, 0x26, 0xa4, 0xb5, 0x49, 0x08,
                0x63, 0x21, 0x10, 0xa6, 0x6c, 0x2f, 0x65, 0x91, 0xea, 0xbd, 0x33, 0x45, 0xe3, 0xe4, 0xeb, 0x98,
                0xfa, 0x6e, 0x26, 0x4b, 0xf0, 0x9e, 0xfe, 0x12, 0xee, 0x50, 0xf8, 0xf5, 0x4e, 0x9f, 0x77, 0xb1,
                0xe3, 0x55, 0xf6, 0xc5, 0x05, 0x44, 0xe2, 0x3f, 0xb1, 0x43, 0x3d, 0xdf, 0x73, 0xbe, 0x84, 0xd8,
                0x79, 0xde, 0x7c, 0x00, 0x46, 0xdc, 0x49, 0x96, 0xd9, 0xe7, 0x73, 0xf4, 0xbc, 0x9e, 0xfe, 0x57,
                0x38, 0x82, 0x9a, 0xdb, 0x26, 0xc8, 0x1b, 0x37, 0xc9, 0x3a, 0x1b, 0x27, 0x0b, 0x20, 0x32, 0x9d,
                0x65, 0x86, 0x75, 0xfc, 0x6e, 0xa5, 0x34, 0xe0, 0x81, 0x0a, 0x44, 0x32, 0x82, 0x6b, 0xf5, 0x8c,
                0x94, 0x1e, 0xfb, 0x65, 0xd5, 0x7a, 0x33, 0x8b, 0xbd, 0x2e, 0x26, 0x64, 0x0f, 0x89, 0xff, 0xbc,
                0x1a, 0x85, 0x8e, 0xfc, 0xb8, 0x55, 0x0e, 0xe3, 0xa5, 0xe1, 0x99, 0x8b, 0xd1, 0x77, 0xe9, 0x3a,
                0x73, 0x63, 0xc3, 0x44, 0xfe, 0x6b, 0x19, 0x9e, 0xe5, 0xd0, 0x2e, 0x82, 0xd5, 0x22, 0xc4, 0xfe,
                0xba, 0x15, 0x45, 0x2f, 0x80, 0x28, 0x8a, 0x82, 0x1a, 0x57, 0x91, 0x16, 0xec, 0x6d, 0xad, 0x2b,
                0x3b, 0x31, 0x0d, 0xa9, 0x03, 0x40, 0x1a, 0xa6, 0x21, 0x00, 0xab, 0x5d, 0x1a, 0x36, 0x55, 0x3e,
                0x06, 0x20, 0x3b, 0x33, 0x89, 0x0c, 0xc9, 0xb8, 0x32, 0xf7, 0x9e, 0xf8, 0x05, 0x60, 0xcc, 0xb9,
                0xa3, 0x9c, 0xe7, 0x67, 0x96, 0x7e, 0xd6, 0x28, 0xc6, 0xad, 0x57, 0x3c, 0xb1, 0x16, 0xdb, 0xef,
                0xef, 0xd7, 0x54, 0x99, 0xda, 0x96, 0xbd, 0x68, 0xa8, 0xa9, 0x7b, 0x92, 0x8a, 0x8b, 0xbc, 0x10,
                0x3b, 0x66, 0x21, 0xfc, 0xde, 0x2b, 0xec, 0xa1, 0x23, 0x1d, 0x20, 0x6b, 0xe6, 0xcd, 0x9e, 0xc7,
                0xaf, 0xf6, 0xf6, 0xc9, 0x4f, 0xcd, 0x72, 0x04, 0xed, 0x34, 0x55, 0xc6, 0x8c, 0x83, 0xf4, 0xa4,
                0x1d, 0xa4, 0xaf, 0x2b, 0x74, 0xef, 0x5c, 0x53, 0xf1, 0xd8, 0xac, 0x70, 0xbd, 0xcb, 0x7e, 0xd1,
                0x85, 0xce, 0x81, 0xbd, 0x84, 0x35, 0x9d, 0x44, 0x25, 0x4d, 0x95, 0x62, 0x9e, 0x98, 0x55, 0xa9,
                0x4a, 0x7c, 0x19, 0x58, 0xd1, 0xf8, 0xad, 0xa5, 0xd0, 0x53, 0x2e, 0xd8, 0xa5, 0xaa, 0x3f, 0xb2,
                0xd1, 0x7b, 0xa7, 0x0e, 0xb6, 0x24, 0x8e, 0x59, 0x4e, 0x1a, 0x22, 0x97, 0xac, 0xbb, 0xb3, 0x9d,
                0x50, 0x2f, 0x1a, 0x8c, 0x6e, 0xb6, 0xf1, 0xce, 0x22, 0xb3, 0xde, 0x1a, 0x1f, 0x40, 0xcc, 0x24,
                0x55, 0x41, 0x19, 0xa8, 0x31, 0xa9, 0xaa, 0xd6, 0x07, 0x9c, 0xad, 0x88, 0x42, 0x5d, 0xe6, 0xbd,
                0xe1, 0xa9, 0x18, 0x7e, 0xbb, 0x60, 0x92, 0xcf, 0x67, 0xbf, 0x2b, 0x13, 0xfd, 0x65, 0xf2, 0x70,
                0x88, 0xd7, 0x8b, 0x7e, 0x88, 0x3c, 0x87, 0x59, 0xd2, 0xc4, 0xf5, 0xc6, 0x5a, 0xdb, 0x75, 0x53,
                0x87, 0x8a, 0xd5, 0x75, 0xf9, 0xfa, 0xd8, 0x78, 0xe8, 0x0a, 0x0c, 0x9b, 0xa6, 0x3b, 0xcb, 0xcc,
                0x27, 0x32, 0xe6, 0x94, 0x85, 0xbb, 0xc9, 0xc9, 0x0b, 0xfb, 0xd6, 0x24, 0x81, 0xd9, 0x08, 0x9b,
                0xec, 0xcf, 0x80, 0xcf, 0xe2, 0xdf, 0x16, 0xa2, 0xcf, 0x65, 0xbd, 0x92, 0xdd, 0x59, 0x7b, 0x07,
                0x07, 0xe0, 0x91, 0x7a, 0xf4, 0x8b, 0xbb, 0x75, 0xfe, 0xd4, 0x13, 0xd2, 0x38, 0xf5, 0x55, 0x5a,
                0x7a, 0x56, 0x9d, 0x80, 0xc3, 0x41, 0x4a, 0x8d, 0x08, 0x59, 0xdc, 0x65, 0xa4, 0x61, 0x28, 0xba,
                0xb2, 0x7a, 0xf8, 0x7a, 0x71, 0x31, 0x4f, 0x31, 0x8c, 0x78, 0x2b, 0x23, 0xeb, 0xfe, 0x80, 0x8b,
                0x82, 0xb0, 0xce, 0x26, 0x40, 0x1d, 0x2e, 0x22, 0xf0, 0x4d, 0x83, 0xd1, 0x25, 0x5d, 0xc5, 0x1a,
                0xdd, 0xd3, 0xb7, 0x5a, 0x2b, 0x1a, 0xe0, 0x78, 0x45, 0x04, 0xdf, 0x54, 0x3a, 0xf8, 0x96, 0x9b,
                0xe3, 0xea, 0x70, 0x82, 0xff, 0x7f, 0xc9, 0x88, 0x8c, 0x14, 0x4d, 0xa2, 0xaf, 0x58, 0x42, 0x9e,
                0xc9, 0x60, 0x31, 0xdb, 0xca, 0xd3, 0xda, 0xd9, 0xaf, 0x0d, 0xcb, 0xaa, 0xaf, 0x26, 0x8c, 0xb8,
                0xfc, 0xff, 0xea, 0xd9, 0x4f, 0x3c, 0x7c, 0xa4, 0x95, 0xe0, 0x56, 0xa9, 0xb4, 0x7a, 0xcd, 0xb7,
                0x51, 0xfb, 0x73, 0xe6, 0x66, 0xc6, 0xc6, 0x55, 0xad, 0xe8, 0x29, 0x72, 0x97, 0xd0, 0x7a, 0xd1,
                0xba, 0x5e, 0x43, 0xf1, 0xbc, 0xa3, 0x23, 0x01, 0x65, 0x13, 0x39, 0xe2, 0x29, 0x04, 0xcc, 0x8c,
                0x42, 0xf5, 0x8c, 0x30, 0xc0, 0x4a, 0xaf, 0xdb, 0x03, 0x8d, 0xda, 0x08, 0x47, 0xdd, 0x98, 0x8d,
                0xcd, 0xa6, 0xf3, 0xbf, 0xd1, 0x5c, 0x4b, 0x4c, 0x45, 0x25, 0x00, 0x4a, 0xa0, 0x6e, 0xef, 0xf8,
                0xca, 0x61, 0x78, 0x3a, 0xac, 0xec, 0x57, 0xfb, 0x3d, 0x1f, 0x92, 0xb0, 0xfe, 0x2f, 0xd1, 0xa8,
                0x5f, 0x67, 0x24, 0x51, 0x7b, 0x65, 0xe6, 0x14, 0xad, 0x68, 0x08, 0xd6, 0xf6, 0xee, 0x34, 0xdf,
                0xf7, 0x31, 0x0f, 0xdc, 0x82, 0xae, 0xbf, 0xd9, 0x04, 0xb0, 0x1e, 0x1d, 0xc5, 0x4b, 0x29, 0x27,
                0x09, 0x4b, 0x2d, 0xb6, 0x8d, 0x6f, 0x90, 0x3b, 0x68, 0x40, 0x1a, 0xde, 0xbf, 0x5a, 0x7e, 0x08,
                0xd7, 0x8f, 0xf4, 0xef, 0x5d, 0x63, 0x65, 0x3a, 0x65, 0x04, 0x0c, 0xf9, 0xbf, 0xd4, 0xac, 0xa7,
                0x98, 0x4a, 0x74, 0xd3, 0x71, 0x45, 0x98, 0x67, 0x80, 0xfc, 0x0b, 0x16, 0xac, 0x45, 0x16, 0x49,
                0xde, 0x61, 0x88, 0xa7, 0xdb, 0xdf, 0x19, 0x1f, 0x64, 0xb5, 0xfc, 0x5e, 0x2a, 0xb4, 0x7b, 0x57,
                0xf7, 0xf7, 0x27, 0x6c, 0xd4, 0x19, 0xc1, 0x7a, 0x3c, 0xa8, 0xe1, 0xb9, 0x39, 0xae, 0x49, 0xe4,
                0x88, 0xac, 0xba, 0x6b, 0x96, 0x56, 0x10, 0xb5, 0x48, 0x01, 0x09, 0xc8, 0xb1, 0x7b, 0x80, 0xe1,
                0xb7, 0xb7, 0x50, 0xdf, 0xc7, 0x59, 0x8d, 0x5d, 0x50, 0x11, 0xfd, 0x2d, 0xcc, 0x56, 0x00, 0xa3,
                0x2e, 0xf5, 0xb5, 0x2a, 0x1e, 0xcc, 0x82, 0x0e, 0x30, 0x8a, 0xa3, 0x42, 0x72, 0x1a, 0xac, 0x09,
                0x43, 0xbf, 0x66, 0x86, 0xb6, 0x4b, 0x25, 0x79, 0x37, 0x65, 0x04, 0xcc, 0xc4, 0x93, 0xd9, 0x7e,
                0x6a, 0xed, 0x3f, 0xb0, 0xf9, 0xcd, 0x71, 0xa4, 0x3d, 0xd4, 0x97, 0xf0, 0x1f, 0x17, 0xc0, 0xe2,
                0xcb, 0x37, 0x97, 0xaa, 0x2a, 0x2f, 0x25, 0x66, 0x56, 0x16, 0x8e, 0x6c, 0x49, 0x6a, 0xfc, 0x5f,
                0xb9, 0x32, 0x46, 0xf6, 0xb1, 0x11, 0x63, 0x98, 0xa3, 0x46, 0xf1, 0xa6, 0x41, 0xf3, 0xb0, 0x41,
                0xe9, 0x89, 0xf7, 0x91, 0x4f, 0x90, 0xcc, 0x2c, 0x7f, 0xff, 0x35, 0x78, 0x76, 0xe5, 0x06, 0xb5,
                0x0d, 0x33, 0x4b, 0xa7, 0x7c, 0x22, 0x5b, 0xc3, 0x07, 0xba, 0x53, 0x71, 0x52, 0xf3, 0xf1, 0x61,
                0x0e, 0x4e, 0xaf, 0xe5, 0x95, 0xf6, 0xd9, 0xd9, 0x0d, 0x11, 0xfa, 0xa9, 0x33, 0xa1, 0x5e, 0xf1,
                0x36, 0x95, 0x46, 0x86, 0x8a, 0x7f, 0x3a, 0x45, 0xa9, 0x67, 0x68, 0xd4, 0x0f, 0xd9, 0xd0, 0x34,
                0x12, 0xc0, 0x91, 0xc6, 0x31, 0x5c, 0xf4, 0xfd, 0xe7, 0xcb, 0x68, 0x60, 0x69, 0x37, 0x38, 0x0d,
                0xb2, 0xea, 0xaa, 0x70, 0x7b, 0x4c, 0x41, 0x85, 0xc3, 0x2e, 0xdd, 0xcd, 0xd3, 0x06, 0x70, 0x5e,
                0x4d, 0xc1, 0xff, 0xc8, 0x72, 0xee, 0xee, 0x47, 0x5a, 0x64, 0xdf, 0xac, 0x86, 0xab, 0xa4, 0x1c,
                0x06, 0x18, 0x98, 0x3f, 0x87, 0x41, 0xc5, 0xef, 0x68, 0xd3, 0xa1, 0x01, 0xe8, 0xa3, 0xb8, 0xca,
                0xc6, 0x0c, 0x90, 0x5c, 0x15, 0xfc, 0x91, 0x08, 0x40, 0xb9, 0x4c, 0x00, 0xa0, 0xb9, 0xd0,
            };

            var publicKey = new byte[]
            {
                0x27, 0x81, 0x17, 0xfc, 0x14, 0x4c, 0x72, 0x34, 0x0f, 0x67, 0xd0, 0xf2, 0x31, 0x6e, 0x83, 0x86,
                0xce, 0xff, 0xbf, 0x2b, 0x24, 0x28, 0xc9, 0xc5, 0x1f, 0xef, 0x7c, 0x59, 0x7f, 0x1d, 0x42, 0x6e,
            };

            var privateKey = new byte[]
            {
                0xf5, 0xe5, 0x76, 0x7c, 0xf1, 0x53, 0x31, 0x95, 0x17, 0x63, 0x0f, 0x22, 0x68, 0x76, 0xb8, 0x6c,
                0x81, 0x60, 0xcc, 0x58, 0x3b, 0xc0, 0x13, 0x74, 0x4c, 0x6b, 0xf2, 0x55, 0xf5, 0xcc, 0x0e, 0xe5,
            };

            var expectedSignature = new byte[]
            {
                0x0a, 0xab, 0x4c, 0x90, 0x05, 0x01, 0xb3, 0xe2, 0x4d, 0x7c, 0xdf, 0x46, 0x63, 0x32, 0x6a, 0x3a,
                0x87, 0xdf, 0x5e, 0x48, 0x43, 0xb2, 0xcb, 0xdb, 0x67, 0xcb, 0xf6, 0xe4, 0x60, 0xfe, 0xc3, 0x50,
                0xaa, 0x53, 0x71, 0xb1, 0x50, 0x8f, 0x9f, 0x45, 0x28, 0xec, 0xea, 0x23, 0xc4, 0x36, 0xd9, 0x4b,
                0x5e, 0x8f, 0xcd, 0x4f, 0x68, 0x1e, 0x30, 0xa6, 0xac, 0x00, 0xa9, 0x70, 0x4a, 0x18, 0x8a, 0x03,
            };

            var signature = Signer.Sign(message, privateKey, publicKey);
            Assert.That(signature.ToArray(), Is.EqualTo(expectedSignature));

            var validationResult = Signer.Validate(signature, message, publicKey);
            Assert.That(validationResult, Is.True);
        }
    }
}