(Go) Encrypt Already Existing Zip

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

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    zip := chilkat.NewZip()

    // Open an unencrypted .zip
    success := zip.OpenZip("qa_data/zips/test.zip")
    if success != true {
        fmt.Println(zip.LastErrorText())
        zip.DisposeZip()
        return
    }

    // Unzip to a temp directory.
    numFilesUnzipped := zip.Unzip("qa_output/tmp")
    if numFilesUnzipped < 0 {
        fmt.Println(zip.LastErrorText())
        zip.DisposeZip()
        return
    }

    // 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.SetEncryption(4)
    zip.SetEncryptKeyLength(128)

    // Set the password.
    zip.SetEncryptPassword("secret")

    // Append the files.
    zip.SetAppendFromDir("qa_output/tmp")
    success = zip.AppendFiles("*.*",true)
    if success != true {
        fmt.Println(zip.LastErrorText())
        zip.DisposeZip()
        return
    }

    // Write the .zip and close it.
    success = zip.WriteZipAndClose()
    if success != true {
        fmt.Println(zip.LastErrorText())
        zip.DisposeZip()
        return
    }

    fmt.Println("Success.")

    zip.DisposeZip()