Connect to Secure web service with certificate from SAP EP

Hi Experts,

Here is the current situation:

1. Our business requirement is to connect 3rd party RESTful web service which requires secure connection with private client certificate attached

2. I've tested in my Java test application and successfully attached private certificate to HttpsURLConection request to the web service and made a connection. No problem at all.

KeyStore keyStore  = KeyStore.getInstance("PKCS12");

InputStream inputStream = new FileInputStream("privateKeyCert.p12");

keyStore.load(inputStream, "myPassword".toCharArray());

KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());

keyManagerFactory.init(keyStore, "myPassword".toCharArray());

KeyManager[] kms = keyManagerFactory.getKeyManagers();

SSLContext sslContext = SSLContext.getInstance("SSL");

sslContext.init(kms, null, new SecureRandom());

SSLSocketFactory sockFact = sslContext.getSocketFactory();

URL url = new URL("https://www.thirdpartywebservice.com/testroot/");

HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

conn.setSSLSocketFactory(sockFact);

conn.setRequestMethod("POST");

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setUseCaches(false);

conn.setDefaultUseCaches (false);

conn.setRequestProperty("Content-Type", "text/xml");

3. Next, I tried to apply my Java application to SAP EP NetWeaver, and found that I have to use SecureConnectionFactory:

https://help.sap.com/saphelp_nw70ehp1/helpdata/en/e2/71c83edf72e16be10000000a114084/content.htm

4. So, I modified my Java code for SAP EP:

KeyStore keyStore  = KeyStore.getInstance("PKCS12");

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("privateKeyCert.p12");

keyStore.load(inputStream, "myPassword".toCharArray());

SecureConnectionFactory scFactory = new SecureConnectionFactory(keyStore);

HttpURLConnection conn = scFactory.createURLConnection("https://www.thirdpartywebservice.com/testroot/");

conn.setRequestMethod("POST");

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setUseCaches(false);

conn.setDefaultUseCaches (false);

conn.setRequestProperty("Content-Type", "text/xml");

And I'm facing the following error message:

Exception: java.security.UnrecoverableKeyException: ja

va.security.GeneralSecurityException: Unable to decrypt private key: javax.crypto.BadPaddingException: Invalid PKCS#5 padding length: 253

Could you please help me what this error message means?

Do you think do I need to to do some other configuration to make connection to web service with client certificate?

This is our first approach. Please help...

Thank you in advance.