(Java) Duplicate OpensSSL Command that Decrypts Binary DER

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    crypt.put_CryptAlgorithm("pki");

    CkPem pem = new CkPem();
    boolean success = pem.LoadPemFile("qa_data/pem/myPem.pem","password");
    if (success != true) {
        System.out.println(pem.lastErrorText());
        return;
        }

    CkPrivateKey privkey = pem.GetPrivateKey(0);
    if (pem.get_LastMethodSuccess() != true) {
        System.out.println(pem.lastErrorText());
        return;
        }

    CkCert cert = pem.GetCert(0);
    if (pem.get_LastMethodSuccess() != true) {

        System.out.println(pem.lastErrorText());
        return;
        }

    success = crypt.SetDecryptCert2(cert,privkey);
    if (success != true) {

        System.out.println(crypt.lastErrorText());
        return;
        }

    success = crypt.CkDecryptFile("qa_data/infile.enc","qa_output/outfile.dat");
    if (success != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    System.out.println("Success.");
  }
}