It isn't supported.
There are two alternatives if you use 2.0:
1) use keylength 256 => AES256 will be used
or
2) change the source code. In StandardSecurityHandler.java there is a line
//TODO return 4 if keyLength is 128 to enable AES128 functionality
replace it with this:
else if (keyLength == 128)
return 4;
and your files can be encrypted with AES128 if you use keylen 128.
There is no "official" way to enable AES128 encryption with a setter.
The AES128 encryption/decryption was implemented very recently by me (as
part of an issue that dealt with signing encrypted documents -
PDFBOX-2729), I didn't want to make too much changes before the 2.0
release because it wouldn't have been tested enough.
Tilman
Am 18.02.2016 um 13:56 schrieb M. Niedermair:
Hello,
I have a problem with the AES encryption algorithm.
The PDF generated still displays RC4 and opening only blank pages are
displayed.
I use iText with AES, AES is displayed and when opening all the pages
are displayed correctly.
What am I doing wrong?
greeting
Michael
My Code:
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.encryption.AccessPermission;
import org.apache.pdfbox.pdmodel.encryption.PDEncryption;
import org.apache.pdfbox.pdmodel.encryption.SecurityHandler;
import org.apache.pdfbox.pdmodel.encryption.StandardProtectionPolicy;
import org.apache.pdfbox.util.Version;
public class Test01 {
public static void main(final String[] args) throws IOException {
final File input = new File("s10.pdf");
final File output = new File("target/s10-secure.pdf");
final AccessPermission ap = new AccessPermission();
ap.setCanPrint(true);
ap.setCanPrintDegraded(true);
ap.setCanModify(false);
ap.setCanAssembleDocument(false);
ap.setCanExtractContent(false);
ap.setCanFillInForm(false);
ap.setCanExtractForAccessibility(false);
ap.setCanModifyAnnotations(false);
PDDocument document = PDDocument.load(input);
final StandardProtectionPolicy spp = new
StandardProtectionPolicy("12345", null, ap);
spp.setEncryptionKeyLength(128);
document.protect(spp);
document.getEncryption().getSecurityHandler().setAES(true);
document.getEncryption().getSecurityHandler().setKeyLength(128);
document.setVersion(1.5f);
document.save(output);
document.close();
System.out.println(output.getName() + " create");
// relaod and print info...
document = PDDocument.load(output);
printInfo(document);
document.close();
// load pdf create with itext
System.out.println("\n-------- with iText ----------------------");
document = PDDocument.load(new File("s10-itext.pdf"));
printInfo(document);
document.close();
}
private static void printInfo(final PDDocument document) throws
IOException {
System.out.println("pdfbox : " + Version.getVersion());
System.out.println("Version : " + document.getVersion());
System.out.println("encrypted : " + document.isEncrypted());
final AccessPermission perm =
document.getCurrentAccessPermission();
System.out.println("enc_accesspermission : " +
perm.canAssembleDocument());
System.out.println("enc_extractcontent : " +
perm.canExtractContent());
System.out.println("enc_extractforaccessibility : " +
perm.canExtractForAccessibility());
System.out.println("enc_fillinform : " +
perm.canFillInForm());
System.out.println("enc_modify : " +
perm.canModify());
System.out.println("enc_modifyannotations : " +
perm.canModifyAnnotations());
System.out.println("enc_print : " +
perm.canPrint());
System.out.println("enc_printdegraded : " +
perm.canPrintDegraded());
final PDEncryption enc = document.getEncryption();
System.out.println("enc_length : " + enc.getLength());
final SecurityHandler sh = enc.getSecurityHandler();
System.out.println("enc_sh_length : " + sh.getKeyLength());
System.out.println("enc_sh_name : " + (sh.isAES() ? "AES" :
"RC4"));
}
}
Output:
s10-secure.pdf create
pdfbox : 2.0.0-RC3
Version : 1.5
encrypted : true
enc_accesspermission : false
enc_extractcontent : false
enc_extractforaccessibility : false
enc_fillinform : false
enc_modify : false
enc_modifyannotations : false
enc_print : true
enc_printdegraded : true
enc_length : 128
enc_sh_length : 40
enc_sh_name : RC4
-------- with iText ----------------------
pdfbox : 2.0.0-RC3
Version : 1.5
encrypted : true
enc_accesspermission : false
enc_extractcontent : false
enc_extractforaccessibility : false
enc_fillinform : false
enc_modify : false
enc_modifyannotations : false
enc_print : true
enc_printdegraded : true
enc_length : 128
enc_sh_length : 40
enc_sh_name : AES
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