Perl

Encrypt Already Existing Zip

See more Zip Examples

To encrypt an already existing non-encrypted .zip, the application must open the .zip, set the encryption related properties, and then re-write. Perl

use chilkat();

$success = 0;

# This requires the Chilkat Zip API to have been previously unlocked.
# See Unlock Chilkat Zip for sample code.

$zip = chilkat::CkZip->new();

# Open an unencrypted .zip
$success = $zip->OpenZip("qa_data/zips/test.zip");
if ($success != 1) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Unzip to a temp directory.
$numFilesUnzipped = $zip->Unzip("qa_output/tmp");
if ($numFilesUnzipped < 0) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Clear the zip object.
$zip->NewZip("qa_output/aesTest.zip");

# Indicate that 128-bit AES encryption is to be used when writing the .zip
$zip->put_Encryption(4);
$zip->put_EncryptKeyLength(128);

# Set the password.
$zip->put_EncryptPassword("secret");

# Append the files.
$zip->put_AppendFromDir("qa_output/tmp");
$success = $zip->AppendFiles("*.*",1);
if ($success != 1) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Write the .zip and close it.
$success = $zip->WriteZipAndClose();
if ($success != 1) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

print "Success." . "\r\n";