[java] How can I use different certificates on specific connections?

I read through LOTS of places online to solve this thing. This is the code I wrote to make it work:

ByteArrayInputStream derInputStream = new ByteArrayInputStream(app.certificateString.getBytes());
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
X509Certificate cert = (X509Certificate) certificateFactory.generateCertificate(derInputStream);
String alias = "alias";//cert.getSubjectX500Principal().getName();

KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(null);
trustStore.setCertificateEntry(alias, cert);
KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
kmf.init(trustStore, null);
KeyManager[] keyManagers = kmf.getKeyManagers();

TrustManagerFactory tmf = TrustManagerFactory.getInstance("X509");
tmf.init(trustStore);
TrustManager[] trustManagers = tmf.getTrustManagers();

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(keyManagers, trustManagers, null);
URL url = new URL(someURL);
conn = (HttpsURLConnection) url.openConnection();
conn.setSSLSocketFactory(sslContext.getSocketFactory());

app.certificateString is a String that contains the Certificate, for example:

static public String certificateString=
        "-----BEGIN CERTIFICATE-----\n" +
        "MIIGQTCCBSmgAwIBAgIHBcg1dAivUzANBgkqhkiG9w0BAQsFADCBjDELMAkGA1UE" +
        "BhMCSUwxFjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBE" +
        ... a bunch of characters...
        "5126sfeEJMRV4Fl2E5W1gDHoOd6V==\n" +
        "-----END CERTIFICATE-----";

I have tested that you can put any characters in the certificate string, if it is self signed, as long as you keep the exact structure above. I obtained the certificate string with my laptop's Terminal command line.

Examples related to java

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How much should a function trust another function How to implement a simple scenario the OO way Two constructors How do I get some variable from another class in Java? this in equals method How to split a string in two and store it in a field How to do perspective fixing? String index out of range: 4 My eclipse won't open, i download the bundle pack it keeps saying error log

Examples related to ssl

Requests (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.") Error in PyCharm requesting website A fatal error occurred while creating a TLS client credential. The internal error state is 10013 curl: (35) error:1408F10B:SSL routines:ssl3_get_record:wrong version number How to install OpenSSL in windows 10? ssl.SSLError: tlsv1 alert protocol version Invalid self signed SSL cert - "Subject Alternative Name Missing" "SSL certificate verify failed" using pip to install packages ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749) Powershell Invoke-WebRequest Fails with SSL/TLS Secure Channel "ssl module in Python is not available" when installing package with pip3

Examples related to keystore

What is difference between cacerts and keystore? Where is debug.keystore in Android Studio keytool error Keystore was tampered with, or password was incorrect How to add certificate chain to keystore? Default keystore file does not exist? How to list the certificates stored in a PKCS12 keystore with keytool? How to check certificate name and alias in keystore files? How to properly import a selfsigned certificate into Java keystore that is available to all Java applications by default? What certificates are trusted in truststore? Difference between .keystore file and .jks file

Examples related to truststore

Specifying trust store information in spring boot application.properties What certificates are trusted in truststore? java - path to trustStore - set property doesn't work? How can I use different certificates on specific connections? Digital Certificate: How to import .cer file in to .truststore file using? Truststore and Keystore Definitions

Examples related to jsse

javax.net.ssl.SSLException: Received fatal alert: protocol_version Keystore type: which one to use? java - path to trustStore - set property doesn't work? Java client certificates over HTTPS/SSL How can I use different certificates on specific connections? scp via java