Hello everyone,
I would like to add some restrictions on my pdf (user password, owner
password, read only mode...) and sign the result. I can sign it, I can encrypt
it, but I can't encrypt it then sign it, because when I do so, my pdf is only
signed, I loose my restrictions as the user password for example. Here is my
source code :
// Encrypt it
PdfReader reader = new PdfReader("guide.pdf");
FileOutputStream fout = new FileOutputStream("encrypted.pdf");
PdfEncryptor.encrypt(reader,fout,"user".getBytes(),
"owner".getBytes(),0,true);
// Sign it
KeyStore ks = KeyStore.getInstance("pkcs12");
ks.load(new FileInputStream("JohnSmith.pfx"), "azerty".toCharArray());
String alias = (String) ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias, "azerty".toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
fout = new FileOutputStream("signednEncrypted.pdf");
reader = new PdfReader("encrypted.pdf","owner".getBytes());
PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.getSignatureAppearance();
sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
sap.setReason("I'm the author");
sap.setLocation("Lisbon");
stp.close();
Thanking you in advance.
John
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