Java

Determine if a Zip is Encrypted or Password-Protected

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Determines whether or not a zip archive is AES encrypted or password-protected. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Zip;

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.

        Zip zip = new Zip();

        // An encrypted or password-protected zip can be opened
        // without specifying the password.  However, the contents
        // of the files cannot be unzipped without providing the correct
        // password.

        try {
            zip.openZip("something.zip");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // If the zip is password-protected, meaning that it uses
        // the old (insecure) Zip 2.0 encryption, then the
        // PasswordProtect property will be true
        boolean bPwdProt = zip.getPasswordProtect();
        if (bPwdProt) {
            System.out.println("This zip is password-protected.");
        }

        // If the zip is AES encrypted (WinZip compatible) then
        // the Encryption property will be equal to 4.
        int encValue = zip.getEncryption();
        if (encValue == 4) {
            System.out.println("This zip is AES encrypted.");
        }

        // If the Encryption property = 0, then the zip is NOT
        // strong encrypted, and is either password-protected or
        // entirely unencrypted, depending on the value of the
        // PasswordProtect property.

        zip.closeZip();
    }
}