70 lines
2.6 KiB
Java
70 lines
2.6 KiB
Java
// Copyright (C) 2015 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.googlesource.gerrit.convertkey;
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import com.jcraft.jsch.HostKey;
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import com.jcraft.jsch.JSchException;
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import java.io.File;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.security.GeneralSecurityException;
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import java.security.KeyPair;
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import org.apache.sshd.common.util.Buffer;
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import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
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import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
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public class ConvertKey {
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public static void main(String[] args)
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throws GeneralSecurityException, JSchException, IOException {
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SimpleGeneratorHostKeyProvider p;
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if (args.length != 1) {
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System.err.println("Error: requires path to the SSH host key");
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return;
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} else {
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File file = new File(args[0]);
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if (!file.exists() || !file.isFile() || !file.canRead()) {
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System.err.println("Error: ssh key should exist and be readable");
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return;
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}
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}
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p = new SimpleGeneratorHostKeyProvider();
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// Gerrit's SSH "simple" keys are always RSA.
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p.setPath(args[0]);
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p.setAlgorithm("RSA");
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Iterable<KeyPair> keys = p.loadKeys(); // forces the key to generate.
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for (KeyPair k : keys) {
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System.out.println("Public Key (" + k.getPublic().getAlgorithm() + "):");
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// From Gerrit's SshDaemon class; use JSch to get the public
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// key/type
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final Buffer buf = new Buffer();
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buf.putRawPublicKey(k.getPublic());
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final byte[] keyBin = buf.getCompactData();
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HostKey pub = new HostKey("localhost", keyBin);
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System.out.println(pub.getType() + " " + pub.getKey());
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System.out.println("Private Key:");
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// Use Bouncy Castle to write the private key back in PEM format
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// (PKCS#1)
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// http://stackoverflow.com/questions/25129822/export-rsa-public-key-to-pem-string-using-java
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StringWriter privout = new StringWriter();
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JcaPEMWriter privWriter = new JcaPEMWriter(privout);
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privWriter.writeObject(k.getPrivate());
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privWriter.close();
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System.out.println(privout);
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}
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}
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}
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