public static void main(String[] args)
throws GeneralSecurityException, JSchException, IOException {
SimpleGeneratorHostKeyProvider p;
if (args.length != 1) {
System.err.println("Error: requires path to the SSH host key");
return;
} else {
File file = new File(args[0]);
if (!file.exists() || !file.isFile() || !file.canRead()) {
System.err.println("Error: ssh key should exist and be readable");
return;
}
}
p = new SimpleGeneratorHostKeyProvider();
// Gerrit's SSH "simple" keys are always RSA.
p.setPath(args[0]);
p.setAlgorithm("RSA");
Iterable<KeyPair> keys = p.loadKeys(); // forces the key to generate.
for (KeyPair k : keys) {
System.out.println("Public Key (" + k.getPublic().getAlgorithm() + "):");
// From Gerrit's SshDaemon class; use JSch to get the public
// key/type
final Buffer buf = new Buffer();
buf.putRawPublicKey(k.getPublic());
final byte[] keyBin = buf.getCompactData();
HostKey pub = new HostKey("localhost", keyBin);
System.out.println(pub.getType() + " " + pub.getKey());
System.out.println("Private Key:");
// Use Bouncy Castle to write the private key back in PEM format
// (PKCS#1)
// http://stackoverflow.com/questions/25129822/export-rsa-public-key-to-pem-string-using-java
StringWriter privout = new StringWriter();
JcaPEMWriter privWriter = new JcaPEMWriter(privout);
privWriter.writeObject(k.getPrivate());
privWriter.close();
System.out.println(privout);
}
}
