Java

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

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).

Java

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[])
  {
    boolean success = false;

    // 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();
    success = pem.LoadPemFile("qa_data/pem/myPem.pem","password");
    if (success == false) {
        System.out.println(pem.lastErrorText());
        return;
        }

    CkPrivateKey privkey = new CkPrivateKey();
    success = pem.PrivateKeyAt(0,privkey);
    if (success == false) {
        System.out.println(pem.lastErrorText());
        return;
        }

    CkCert cert = new CkCert();
    success = pem.CertAt(0,cert);
    if (success == false) {
        System.out.println(pem.lastErrorText());
        return;
        }

    success = crypt.SetDecryptCert2(cert,privkey);
    if (success == false) {
        System.out.println(crypt.lastErrorText());
        return;
        }

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

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