Java

Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

See more OpenSSL Examples

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.PrivateKey;

public class ChilkatExample {

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

        // Duplicates the following openssl command:
        // openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

        Cert cert = new Cert();
        try {
            cert.loadFromFile("qa_data/openssl/EE.cer");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        BinData bd = new BinData();
        bd.loadFile("qa_data/openssl/EE.key");
        // Assuming success..

        PrivateKey privKey = new PrivateKey();
        try {
            privKey.loadAnyFormat(bd, "");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Crypt2 crypt = new Crypt2();
        try {
            crypt.setDecryptCert2(cert, privKey);

            crypt.setCryptAlgorithm("PKI");
            crypt.ckDecryptFile("qa_data/openssl/hello.txt.enc", "qa_output/hello.txt");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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