Encrypt

Encrypt PDF-document.

func (document *Document) Encrypt(userPassword string, ownerPassword string, permissions Permissions, cryptoAlgorithm CryptoAlgorithm, usePdf20 bool) error

Parameters:

• userPassword - user password
• ownerPassword - owner password
• permissions - bitmask of allowed PDF permissions (combine flags using |):

type Permissions int32
const (
    PrintDocument                  Permissions = 1 << 2  // 4
    ModifyContent                  Permissions = 1 << 3  // 8
    ExtractContent                 Permissions = 1 << 4  // 16
    ModifyTextAnnotations          Permissions = 1 << 5  // 32
    FillForm                       Permissions = 1 << 8  // 256
    ExtractContentWithDisabilities Permissions = 1 << 9  // 512
    AssembleDocument               Permissions = 1 << 10 // 1024
    PrintingQuality                Permissions = 1 << 11 // 2048
)

• cryptoAlgorithm - encryption algorithm:

type CryptoAlgorithm int32
const (
	RC4x40  CryptoAlgorithm = 0 // RC4 with key length 40.
	RC4x128 CryptoAlgorithm = 1 // RC4 with key length 128.
	AESx128 CryptoAlgorithm = 2 // AES with key length 128.
	AESx256 CryptoAlgorithm = 3 // AES with key length 256.
)

• usePdf20 - if true, uses PDF 2.0 encryption (for AESx128/256); otherwise uses standard PDF 1.x encryption

Return:

• error - contains an error or nil if absent

Example:

package main

import "github.com/aspose-pdf/aspose-pdf-go-cpp"
import "log"

func main() {
	// New creates a new PDF-document
	pdf, err := asposepdf.New()
	if err != nil {
		log.Fatal(err)
	}
	// Close() releases allocated resources for PDF-document
	defer pdf.Close()
	// Encrypt(userPassword, ownerPassword, permissions, cryptoAlgorithm, usePdf20) encrypts PDF-document
	err = pdf.Encrypt(
		"userpass",
		"ownerpass",
		asposepdf.PrintDocument|asposepdf.ModifyContent|asposepdf.FillForm,
		asposepdf.AESx128,
		true,
	)
	if err != nil {
		log.Fatal(err)
	}
	// SaveAs(filename string) saves previously opened PDF-document with new filename
	err = pdf.SaveAs("sample_with_password.pdf")
	if err != nil {
		log.Fatal(err)
	}
}