How to unzip encrypted zipfile with Camel

Question

I would like to unzip and decrypt a zip-encrypted file "Encrypted.zip" using Apache Camel.

The encryption has been done as part of the zipping process, with a simple password, so this is a one-step process, not x.zip.pgp or x.pgp.zip. Zip encryption seems to be AES.

ZipFileDataFormat does not seem to have a password option and Crypto seems to be oriented towards key-files and probably not suited for multiple files.

I have a solution that wraps a call to 7zip.exe, but I am looking for a more efficient and Camel-native way of solving the problem.

Answer 1

A Google search led me to Martin Matula's blog: http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/

He has written an InputStream in Java which does what you seem to request:

public class ZipDecryptInputStream extends InputStream {

    public ZipDecryptInputStream(InputStream stream, String password) {
        this.delegate = stream;
        this.password = password;
    }

    ...
}

You should also take a look at Apache Commons Compress which I also believe supports reading of encrypted zipfiles.

Whether or not this is entangled in Camel is probably not so relevant for the problem at hand. Once you have a class, which can read an encrypted zipfile, you can create a custom processor or endpoint in Camel.