core/src/main/java/org/nanohttpd/protocols/http/NanoHTTPD.java
public static SSLServerSocketFactory makeSSLSocketFactory(String keyAndTrustStoreClasspathPath, char[] passphrase) throws IOException {
        try {
            KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
            InputStream keystoreStream = NanoHTTPD.class.getResourceAsStream(keyAndTrustStoreClasspathPath);

            if (keystoreStream == null) {
                throw new IOException("Unable to load keystore from classpath: " + keyAndTrustStoreClasspathPath);
            }

            keystore.load(keystoreStream, passphrase);
            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(keystore, passphrase);
            return makeSSLSocketFactory(keystore, keyManagerFactory);
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }
public static SSLServerSocketFactory makeSSLSocketFactory(String keyAndTrustStoreClasspathPath, char[] passphrase) throws IOException {
        try {
            KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
            InputStream keystoreStream = NanoHTTPD.class.getResourceAsStream(keyAndTrustStoreClasspathPath);

            if (keystoreStream == null) {
                throw new IOException("Unable to load keystore from classpath: " + keyAndTrustStoreClasspathPath);
            }

            keystore.load(keystoreStream, passphrase);
            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(keystore, passphrase);
            return makeSSLSocketFactory(keystore, keyManagerFactory);
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }
Creates an SSLSocketFactory for HTTPS. Pass a KeyStore resource with your
certificate and passphrase