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

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

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#import <CkoZip.h>

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

CkoZip *zip = [[CkoZip alloc] init];

// 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.

BOOL success = [zip OpenZip: @"something.zip"];
if (success != YES) {
    NSLog(@"%@",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 YES
BOOL bPwdProt = zip.PasswordProtect;
if (bPwdProt) {
    NSLog(@"%@",@"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.Encryption intValue];
if (encValue == 4) {
    NSLog(@"%@",@"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];