(Node.js) Determine if a Zip is Encrypted or Password-Protected

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

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var zip = new chilkat.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.

    var success = zip.OpenZip("something.zip");
    if (success !== true) {
        console.log(zip.LastErrorText);
        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
    var bPwdProt = zip.PasswordProtect;
    if (bPwdProt) {
        console.log("This zip is password-protected.");
    }

    // If the zip is AES encrypted (WinZip compatible) then
    // the Encryption property will be equal to 4.
    var encValue = zip.Encryption;
    if (encValue == 4) {
        console.log("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();

}

chilkatExample();