Retire legacy implementations and flatten managed layout

tests/VoiceCat.Tests/TofuTlsTests.cs

@@ -0,0 +1,65 @@
+using VoiceCat.Crypto;
+
+namespace VoiceCat.Tests;
+
+public class TofuTlsTests
+{
+    [Fact]
+    public void PinCreatesMissingParentDirectory()
+    {
+        string root = Path.Combine(Path.GetTempPath(), "voicecat-tofu-parent-" + Guid.NewGuid());
+        string path = Path.Combine(root, "nested", "pins.txt");
+        try
+        {
+            var store = new TofuStore(path);
+            store.Pin("localhost", 8384, new string('a', 64));
+
+            Assert.True(File.Exists(path));
+            Assert.Equal(TofuStatus.Matched, new TofuStore(path).Check("localhost", 8384, new string('A', 64)));
+        }
+        finally { if (Directory.Exists(root)) Directory.Delete(root, true); }
+    }
+
+    [Fact]
+    public void RealHandshakesRequireAcceptanceAndRejectChangedCertificatesAfterRestart()
+    {
+        string directory = Path.Combine(Path.GetTempPath(), "voicecat-tofu-tls-" + Guid.NewGuid());
+        Directory.CreateDirectory(directory);
+        string path = Path.Combine(directory, "pins.txt");
+        try
+        {
+            using var credentials = ServerCredentials.LoadOrCreate(Path.Combine(directory, "server"), "server");
+            var store = new TofuStore(path);
+            using (var server = credentials.CreateTlsSession())
+            using (var rejected = TlsSession.CreateClient(fingerprint =>
+            {
+                Assert.Equal(TofuStatus.FirstConnect, store.Check("localhost", 9987, fingerprint));
+                return false;
+            }))
+                Assert.ThrowsAny<IOException>(() => TlsTests.Handshake(rejected, server));
+            Assert.False(File.Exists(path));
+            using (var server = credentials.CreateTlsSession())
+            using (var accepted = TlsSession.CreateClient(fingerprint =>
+            {
+                Assert.Equal(TofuStatus.FirstConnect, store.Check("localhost", 9987, fingerprint));
+                store.Pin("localhost", 9987, fingerprint);
+                return true;
+            }))
+                TlsTests.Handshake(accepted, server);
+            store = new(path);
+            using (var server = credentials.CreateTlsSession())
+            using (var returning = TlsSession.CreateClient(fingerprint => store.Check("localhost", 9987, fingerprint) == TofuStatus.Matched))
+                TlsTests.Handshake(returning, server);
+            using var rotated = ServerCredentials.LoadOrCreate(Path.Combine(directory, "rotated"), "server");
+            using (var server = rotated.CreateTlsSession())
+            using (var mismatch = TlsSession.CreateClient(fingerprint =>
+            {
+                Assert.Equal(TofuStatus.Mismatch, store.Check("localhost", 9987, fingerprint));
+                return false;
+            }))
+                Assert.ThrowsAny<IOException>(() => TlsTests.Handshake(mismatch, server));
+            Assert.Equal(TofuStatus.Matched, new TofuStore(path).Check("localhost", 9987, credentials.CertificateFingerprint));
+        }
+        finally { Directory.Delete(directory, true); }
+    }
+}