Add SSL

trustSsl.java

import javax.net.ssl.*;
import java.io.*;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class Test {
    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

    public static void trustSsl(String host, int port) throws Exception {
        // using default trust store phrase
        char[] passphrase = "changeit".toCharArray();
        char separatorChar = File.separatorChar;
        // determine trust store file
        File dir = new File(System.getProperty("java.home")
                + separatorChar + "lib" + separatorChar + "security");
        File file = new File(dir, "jssecacerts");
        if (!file.isFile()) {
            file = new File(dir, "cacerts");
        }
        // load trust store contents
        System.out.println("Loading KeyStore " + file + "...");
        InputStream in = new FileInputStream(file);
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
        ks.load(in, passphrase);
        in.close();
        // add certificate
        SSLContext context = SSLContext.getInstance("TLS");
        TrustManagerFactory tmf =
                TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        tmf.init(ks);
        X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
        SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
        context.init(null, new TrustManager[]{tm}, null);
        SSLSocketFactory factory = context.getSocketFactory();


        SSLSocket socket;
        socket = (SSLSocket) factory.createSocket(host, port);
        socket.setSoTimeout(10000);
        try {
            System.out.println("Starting SSL handshake...");
            socket.startHandshake();
            socket.close();
            System.out.println();
            System.out.println("No errors, certificate is already trusted");
        } catch (SSLException e) {
            System.out.println();
            e.printStackTrace(System.out);
        }


        X509Certificate[] chain = tm.chain;
        if (chain == null) {
            System.out.println("Could not obtain server certificate chain");
            return;
        }


        System.out.println();
        System.out.println("Server sent " + chain.length + " certificate(s):");
        System.out.println();
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        for (int i = 0; i < chain.length; i++) {
            X509Certificate cert = chain[i];
            System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
            System.out.println(" Issuer " + cert.getIssuerDN());
            sha1.update(cert.getEncoded());
            System.out.println(" sha1 " + toHexString(sha1.digest()));
            md5.update(cert.getEncoded());
            System.out.println(" md5 " + toHexString(md5.digest()));
            System.out.println();
        }


        int k = 0;


        X509Certificate cert = chain[k];
        String alias = host + "-" + (k + 1);
        ks.setCertificateEntry(alias, cert);


        OutputStream out = new FileOutputStream(file);
        ks.store(out, passphrase);
        out.close();


        System.out.println();
        System.out.println(cert);
        System.out.println();
        System.out.println("Added certificate to keystore using alias '" + alias + "'");
    }

    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (int b : bytes) {
            b &= 0xff;
            sb.append(HEXDIGITS[b >> 4]);
            sb.append(HEXDIGITS[b & 15]);
            sb.append(' ');
        }
        return sb.toString();
    }

    private static class SavingTrustManager implements X509TrustManager {


        private final X509TrustManager tm;
        private X509Certificate[] chain;


        SavingTrustManager(X509TrustManager tm) {
            this.tm = tm;
        }


        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }


        public void checkClientTrusted(X509Certificate[] chain, String authType) {
            throw new UnsupportedOperationException();
        }


        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            this.chain = chain;
            tm.checkServerTrusted(chain, authType);
        }
    }

    public static void main(String[] args) throws Exception {
        trustSsl("registry.npmjs.org", 443);
    }
}