Java

Encrypt File using X.509 Certificate using AES in CBC Mode

See more Encryption Examples

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.) 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();

    //  Use public-key cryptography for encryption.
    crypt.put_CryptAlgorithm("pki");

    //  Get an X.509 certificate to use for encrypting.
    //  Note: Chilkat provides many different ways of loading a certificate, from many different formats,
    //  or if on Windows, from the installed certificates on the system.
    //  This example simply loads a certificate from a file.
    //  Also, for encryption, only the public key is needed.  Digital certificates embed the public key
    //  within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("qa_data/certs/testCert.cer");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    success = crypt.SetEncryptCert(cert);
    if (success != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    //  Indicate the underlying bulk encryption algorithm to be used:
    crypt.put_Pkcs7CryptAlg("aes");
    crypt.put_KeyLength(128);

    //  Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

    //  There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
    //  By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    //  use RSAES_OAEP.  (We'll leave it set at the default value of false)
    crypt.put_OaepPadding(false);

    //  Everything is specified.  Now just encrypt...
    //  The output is PKCS7 in binary DER format.
    success = crypt.CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7");
    if (success != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

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