(JavaScript) Determine if a Zip is Encrypted or Password-Protected

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

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var zip = new CkZip();

// 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.

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();