In-memory SSH keys for the "no files" sshd tests

Avoid using a key written to a file. This makes it clearer that
the test does not rely on files being present.

Change-Id: I31cf4f404aab5b891c32fc4bda906b7f8fe03777
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit.junit.ssh/src/org/eclipse/jgit/junit/ssh/SshTestGitServer.java

 /*
- * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch> and others
+ * Copyright (C) 2018, 2020 Thomas Wolf <thomas.wolf@paranor.ch> and others
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0 which is available at
 					.loadKeyPairIdentities(null,
 							NamedResource.ofName(key.toString()), in, null)
 					.iterator().next();
-			if (inFront) {
-				hostKeys.add(0, pair);
-			} else {
-				hostKeys.add(pair);
-			}
+			addHostKey(pair, inFront);
+		}
+	}
+
+	/**
+	 * Adds an additional host key to the server.
+	 *
+	 * @param key
+	 *            {@link KeyPair} to add
+	 * @param inFront
+	 *            whether to add the new key before other existing keys
+	 * @since 5.8
+	 */
+	public void addHostKey(@NonNull KeyPair key, boolean inFront) {
+		if (inFront) {
+			hostKeys.add(0, key);
+		} else {
+			hostKeys.add(key);
 		}
 	}
 
 				.resolvePublicKey(null, PublicKeyEntryResolver.IGNORING);
 	}
 
+	/**
+	 * Sets the test user's public key on the server.
+	 *
+	 * @param key
+	 *            to set
+	 *
+	 * @since 5.8
+	 */
+	public void setTestUserPublicKey(@NonNull PublicKey key) {
+		this.testKey = key;
+	}
+
 	/**
 	 * Sets the lines the server sends before its server identification in the
 	 * initial protocol version exchange.

org.eclipse.jgit.ssh.apache.test/tst/org/eclipse/jgit/transport/sshd/NoFilesSshBuilderTest.java

 package org.eclipse.jgit.transport.sshd;
 
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.UncheckedIOException;
 import java.net.InetSocketAddress;
 import java.nio.file.Files;
-import java.nio.file.Path;
 import java.security.GeneralSecurityException;
 import java.security.KeyPair;
+import java.security.KeyPairGenerator;
 import java.security.PublicKey;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 
-import org.apache.sshd.common.NamedResource;
 import org.apache.sshd.common.config.keys.KeyUtils;
 import org.apache.sshd.common.keyprovider.KeyIdentityProvider;
 import org.apache.sshd.common.session.SessionContext;
 import org.apache.sshd.common.util.net.SshdSocketAddress;
-import org.apache.sshd.common.util.security.SecurityUtils;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.transport.CredentialsProvider;
 import org.eclipse.jgit.transport.SshSessionFactory;
 		}
 	}
 
-	private KeyPair load(Path path) throws Exception {
-		try (InputStream in = Files.newInputStream(path)) {
-			return SecurityUtils
-					.loadKeyPairIdentities(null,
-							NamedResource.ofName(path.toString()), in, null)
-					.iterator().next();
-		}
-	}
-
 	@Test
 	public void testCloneWithBuiltInKeys() throws Exception {
 		// This test should fail unless our in-memory setup is taken: no
-		// known_hosts file, and a config that specifies a non-existing key.
-		File newHostKey = new File(getTemporaryDirectory(), "newhostkey");
-		copyTestResource("id_ed25519", newHostKey);
-		server.addHostKey(newHostKey.toPath(), true);
-		testServerKey = load(newHostKey.toPath()).getPublic();
-		assertTrue(newHostKey.delete());
-		testUserKey = load(privateKey1.getAbsoluteFile().toPath());
+		// known_hosts file, a config that specifies a non-existing key,
+		// and the test is using a newly generated KeyPairs anyway.
+		KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+		generator.initialize(2048);
+		testUserKey = generator.generateKeyPair();
+		KeyPair hostKey = generator.generateKeyPair();
+		server.addHostKey(hostKey, true);
+		testServerKey = hostKey.getPublic();
 		assertNotNull(testServerKey);
 		assertNotNull(testUserKey);
+		server.setTestUserPublicKey(testUserKey.getPublic());
 		cloneWith(
 				"ssh://" + TEST_USER + "@localhost:" + testPort
 						+ "/doesntmatter",

org.eclipse.jgit.ssh.apache.test/tst/org/eclipse/jgit/transport/sshd/NoFilesSshTest.java

 /*
- * Copyright (C) 2019 Thomas Wolf <thomas.wolf@paranor.ch> and others
+ * Copyright (C) 2019, 2020 Thomas Wolf <thomas.wolf@paranor.ch> and others
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0 which is available at
 package org.eclipse.jgit.transport.sshd;
 
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.UncheckedIOException;
 import java.net.InetSocketAddress;
 import java.nio.file.Files;
-import java.nio.file.Path;
 import java.security.GeneralSecurityException;
 import java.security.KeyPair;
+import java.security.KeyPairGenerator;
 import java.security.PublicKey;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 
-import org.apache.sshd.common.NamedResource;
 import org.apache.sshd.common.config.keys.KeyUtils;
 import org.apache.sshd.common.keyprovider.KeyIdentityProvider;
 import org.apache.sshd.common.session.SessionContext;
 import org.apache.sshd.common.util.net.SshdSocketAddress;
-import org.apache.sshd.common.util.security.SecurityUtils;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.transport.CredentialsProvider;
 import org.eclipse.jgit.transport.SshSessionFactory;
 		}
 	}
 
-	private KeyPair load(Path path) throws Exception {
-		try (InputStream in = Files.newInputStream(path)) {
-			return SecurityUtils
-					.loadKeyPairIdentities(null,
-							NamedResource.ofName(path.toString()), in, null)
-					.iterator().next();
-		}
-	}
-
 	@Test
 	public void testCloneWithBuiltInKeys() throws Exception {
 		// This test should fail unless our in-memory setup is taken: no
-		// known_hosts file, and a config that specifies a non-existing key.
-		File newHostKey = new File(getTemporaryDirectory(), "newhostkey");
-		copyTestResource("id_ed25519", newHostKey);
-		server.addHostKey(newHostKey.toPath(), true);
-		testServerKey = load(newHostKey.toPath()).getPublic();
-		assertTrue(newHostKey.delete());
-		testUserKey = load(privateKey1.getAbsoluteFile().toPath());
+		// known_hosts file, a config that specifies a non-existing key,
+		// and the test is using a newly generated KeyPairs anyway.
+		KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+		generator.initialize(2048);
+		testUserKey = generator.generateKeyPair();
+		KeyPair hostKey = generator.generateKeyPair();
+		server.addHostKey(hostKey, true);
+		testServerKey = hostKey.getPublic();
 		assertNotNull(testServerKey);
 		assertNotNull(testUserKey);
+		server.setTestUserPublicKey(testUserKey.getPublic());
 		cloneWith(
 				"ssh://" + TEST_USER + "@localhost:" + testPort
 						+ "/doesntmatter",