Added bechmarks

Ed25519 Tests/SignerTests.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
@@ -248,6 +249,66 @@ namespace Ed25519_Tests
             Assert.That(signaturePrivateKeyEncrypted.ToArray(), Is.Not.EqualTo(signaturePrivateKeyDecrypted.ToArray()));
         }
 
+        [Test]
+        public void TestPerformanceSigning()
+        {
+            var privateKey = Signer.GeneratePrivateKey();
+            var publicKey = privateKey.ExtractPublicKey();
+            var rng = new Random();
+            var payload = new byte[1_024];
+            var stopwatch = new Stopwatch();
+            var desiredRuntime = TimeSpan.FromSeconds(30);
+            var counter = 0;
+
+            while (true)
+            {
+                counter++;
+                rng.NextBytes(payload);
+                
+                stopwatch.Start();
+                Signer.Sign(payload, privateKey, publicKey);
+                stopwatch.Stop();
+
+                if(stopwatch.Elapsed >= desiredRuntime)
+                    break;
+            }
+
+            var result = counter / stopwatch.Elapsed.TotalSeconds;
+            TestContext.Write($"Benchmark for signing messages: {result:0.00} messages/second");
+            Assert.That(true);
+        }
+
+        [Test]
+        public void TestPerformanceValidation()
+        {
+            var privateKey = Signer.GeneratePrivateKey();
+            var publicKey = privateKey.ExtractPublicKey();
+            var rng = new Random();
+            var payload = new byte[1_024];
+            var stopwatch = new Stopwatch();
+            var desiredRuntime = TimeSpan.FromSeconds(30);
+            var counter = 0;
+
+            while (true)
+            {
+                counter++;
+                rng.NextBytes(payload);
+
+                var signature = Signer.Sign(payload, privateKey, publicKey);
+                
+                stopwatch.Start();
+                Signer.Validate(signature, payload, publicKey);
+                stopwatch.Stop();
+
+                if (stopwatch.Elapsed >= desiredRuntime)
+                    break;
+            }
+
+            var result = counter / stopwatch.Elapsed.TotalSeconds;
+            TestContext.Write($"Benchmark for validation of messages: {result:0.00} messages/second");
+            Assert.That(true);
+        }
+
         // See https://tools.ietf.org/html/rfc8032#section-7.1
         [Test]
         public void TestRFC8032Test01EmptyMessage()