Remove Zip Encryption

Opens an encrypted zip archive and rewrites it with no encrypton.

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

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[])
  {
    CkZip zip = new CkZip();

    boolean success;

    //  Any string unlocks the component for the 1st 30-days.
    success = zip.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(zip.lastErrorText());
        return;
    }

    //  An encrypted .zip may be "opened" without providing a
    //  password.  However, the contents cannot be unzipped
    //  without setting the DecryptPassword property.
    success = zip.OpenZip("myEncrypted.zip");
    if (success != true) {
        System.out.println(zip.lastErrorText());
        return;
    }

    //  Set the DecryptPassword property:
    zip.put_DecryptPassword("myPassword");

    //  Indicate that when the zip is to be written again,
    //  it should be neither AES encrypted, or password-protected
    //  (i.e. older Zip 2.0 encryption)
    zip.put_Encryption(0);
    zip.put_PasswordProtect(false);

    //  Set the filename of the new unencrypted .zip to be written:
    zip.put_FileName("unencrypted.zip");

    //  Write the unencrypted .zip
    //  What happens during WriteZipAndClose?  --
    //  The encrypted entries from myEncrypted.zip are streamed in,
    //  decrypted, and then written out directly into unencrypted.zip
    //  In other words, internally the component is smart enough
    //  to stream the data from the existing .zip to the new .zip
    //  automatically, decrypting in the process..
    success = zip.WriteZipAndClose();
    if (success != true) {
        System.out.println(zip.lastErrorText());
        return;
    }

    System.out.println("OK!");

  }
}