Add support for openssh known_hosts files

src/Renci.SshNet.Tests/Classes/KnownHostStoreTests.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Renci.SshNet.Common;
+
+namespace Renci.SshNet.Tests.Classes
+{
+    [TestClass]
+    public class KnownHostStoreTests
+    {
+        private static readonly byte[] ExampleKey = new byte[]
+        {
+            0x00, 0x11, 0x22, 0x33, 0x44,
+            0x55, 0x66, 0x77, 0x88, 0x99,
+            0xaa, 0xbb, 0xcc, 0xdd, 0xee,
+            0xff
+        };
+
+        private const string ExampleHost = "some.domain.com";
+        private const string ExampleSubDomain = "*.domain.com";
+        private const string ExampleKeyType = "rsa";
+
+        [TestMethod]
+        public void TestKnownHostStoreFindsHostIfMatch()
+        {
+            KnownHostStore hostStore = new KnownHostStore();
+            hostStore.AddHost(ExampleHost, 22, ExampleKeyType, ExampleKey, false);
+            Assert.IsTrue(hostStore.Knows(ExampleHost, ExampleKeyType, ExampleKey, 22));
+        }
+
+        [TestMethod]
+        public void TestKnownHostStoreFindsHashedHostIfMatch()
+        {
+            KnownHostStore hostStore = new KnownHostStore();
+            hostStore.AddHost(ExampleHost, 22, ExampleKeyType, ExampleKey, true);
+            Assert.IsTrue(hostStore.Knows(ExampleHost, ExampleKeyType, ExampleKey, 22));
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(RevokedKeyException), "Did not throw an exception upon finding a revoked key in the store")]
+        public void TestKnownHostStoreRejectsKeyIfRevoked()
+        {
+            KnownHostStore hostStore = new KnownHostStore();
+            hostStore.AddHost(ExampleHost, 22, ExampleKeyType, ExampleKey, false);
+            hostStore.AddHost(ExampleSubDomain, 22, ExampleKeyType, ExampleKey, false, "@revoked");
+
+            hostStore.Knows(ExampleHost, ExampleKeyType, ExampleKey, 22);
+        }
+    }
+}