(Objective-C) Create a WinZip/7-Zip compatible AES Encrypted Zip

Creates a WinZip compatible AES-encrypted .zip archive

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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];

BOOL success = [zip NewZip: @"/myZipDir/aes.zip"];
if (success != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// Set properties to indicate that the Zip should be
// AES encrypted.

// A value of 4 indicates WinZip compatible AES encryption.
zip.Encryption = [NSNumber numberWithInt:4];

// Key length can be 128, 192, or 256 bits.
zip.EncryptKeyLength = [NSNumber numberWithInt:128];

// Set the password for AES encryption:
zip.EncryptPassword = @"myPassword";

// Add a directory tree to be zipped.  (The files
// are not compressed at this point -- only references
// to the files and directories are added to the zip object.)
BOOL recurse = YES;
success = [zip AppendFiles: @"c:/temp/a/*" recurse: recurse];
if (success != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// Create the encrypted zip ("/myZipDir/aes.zip")
// The path of the zip is what was originally passed
// to the NewZip method (above).  
BOOL success = [zip WriteZipAndClose];
if (success != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@",@"Created AES Encrypted Zip.");