Create AES Encrypted Zip (WinZip Compatible)

Create a WinZip compatible AES encrypted zip.

// Create an AES Encrypted Zip File
Chilkat.Zip zip = new Chilkat.Zip();

zip.UnlockComponent("Anything for 30-day trial");

// Calling NewZip initializes the zip object in memory.
// it does not create a file on disk.
zip.NewZip("AesEncrypted.zip");

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

// A value of 4 indicates WinZip compatible AES encryption.
zip.Encryption = 4;
zip.EncryptKeyLength = 128;  // can be 128, 192, or 256

// Set the password needed to unzip.
zip.SetPassword("myPassword");

// Append a directory tree.  The AppendFiles does
// not read the file contents or append them to the zip
// object in memory.  It simply appends references
// to the files so that when WriteZip (or WriteZipAndClose,
// or WriteExe, etc.) is called, the files are compressed
// and encrypted.
bool recurse = true;
zip.AppendFiles("c:/temp/a/*", recurse);

// Write "AesEncrypted.zip"
bool success = zip.WriteZipAndClose();
if (!success)
{
zip.SaveLastError("zipErrors.txt");
}

MessageBox.Show("Done!");