public PdfDictionary GetEncryptionDictionary()
{
PdfDictionary dic = new PdfDictionary();
if (publicKeyHandler.GetRecipientsSize() > 0)
{
PdfArray recipients = null;
dic.Put(PdfName.FILTER, PdfName.PUBSEC);
dic.Put(PdfName.R, new PdfNumber(revision));
recipients = publicKeyHandler.GetEncodedRecipients();
if (revision == STANDARD_ENCRYPTION_40)
{
dic.Put(PdfName.V, new PdfNumber(1));
dic.Put(PdfName.SUBFILTER, PdfName.ADBE_PKCS7_S4);
dic.Put(PdfName.RECIPIENTS, recipients);
}
else if (revision == STANDARD_ENCRYPTION_128 && encryptMetadata)
{
dic.Put(PdfName.V, new PdfNumber(2));
dic.Put(PdfName.LENGTH, new PdfNumber(128));
dic.Put(PdfName.SUBFILTER, PdfName.ADBE_PKCS7_S4);
dic.Put(PdfName.RECIPIENTS, recipients);
}
else
{
dic.Put(PdfName.R, new PdfNumber(AES_128));
dic.Put(PdfName.V, new PdfNumber(4));
dic.Put(PdfName.SUBFILTER, PdfName.ADBE_PKCS7_S5);
PdfDictionary stdcf = new PdfDictionary();
stdcf.Put(PdfName.RECIPIENTS, recipients);
if (!encryptMetadata)
{
stdcf.Put(PdfName.ENCRYPTMETADATA, PdfBoolean.PDFFALSE);
}
if (revision == AES_128)
{
stdcf.Put(PdfName.CFM, PdfName.AESV2);
}
else
{
stdcf.Put(PdfName.CFM, PdfName.V2);
}
PdfDictionary cf = new PdfDictionary();
cf.Put(PdfName.DEFAULTCRYPTFILTER, stdcf);
dic.Put(PdfName.CF, cf);
if (embeddedFilesOnly)
{
dic.Put(PdfName.EFF, PdfName.DEFAULTCRYPTFILTER);
dic.Put(PdfName.STRF, PdfName.IDENTITY);
dic.Put(PdfName.STMF, PdfName.IDENTITY);
}
else
{
dic.Put(PdfName.STRF, PdfName.DEFAULTCRYPTFILTER);
dic.Put(PdfName.STMF, PdfName.DEFAULTCRYPTFILTER);
}
}
SHA1 sh = new SHA1CryptoServiceProvider();
byte[] encodedRecipient = null;
byte[] seed = publicKeyHandler.GetSeed();
sh.TransformBlock(seed, 0, seed.Length, seed, 0);
for (int i = 0; i < publicKeyHandler.GetRecipientsSize(); i++)
{
encodedRecipient = publicKeyHandler.GetEncodedRecipient(i);
sh.TransformBlock(encodedRecipient, 0, encodedRecipient.Length, encodedRecipient, 0);
}
if (!encryptMetadata)
{
sh.TransformBlock(metadataPad, 0, metadataPad.Length, metadataPad, 0);
}
sh.TransformFinalBlock(seed, 0, 0);
byte[] mdResult = sh.Hash;
SetupByEncryptionKey(mdResult, keyLength);
}
else
{
dic.Put(PdfName.FILTER, PdfName.STANDARD);
dic.Put(PdfName.O, new PdfLiteral(PdfContentByte.EscapeString(ownerKey)));
dic.Put(PdfName.U, new PdfLiteral(PdfContentByte.EscapeString(userKey)));
dic.Put(PdfName.P, new PdfNumber(permissions));
dic.Put(PdfName.R, new PdfNumber(revision));
if (revision == STANDARD_ENCRYPTION_40)
{
dic.Put(PdfName.V, new PdfNumber(1));
}
else if (revision == STANDARD_ENCRYPTION_128 && encryptMetadata)
{
dic.Put(PdfName.V, new PdfNumber(2));
dic.Put(PdfName.LENGTH, new PdfNumber(128));
}
else
{
if (!encryptMetadata)
{
dic.Put(PdfName.ENCRYPTMETADATA, PdfBoolean.PDFFALSE);
}
dic.Put(PdfName.R, new PdfNumber(AES_128));
dic.Put(PdfName.V, new PdfNumber(4));
dic.Put(PdfName.LENGTH, new PdfNumber(128));
PdfDictionary stdcf = new PdfDictionary();
stdcf.Put(PdfName.LENGTH, new PdfNumber(16));
if (embeddedFilesOnly)
{
stdcf.Put(PdfName.AUTHEVENT, PdfName.EFOPEN);
dic.Put(PdfName.EFF, PdfName.STDCF);
dic.Put(PdfName.STRF, PdfName.IDENTITY);
dic.Put(PdfName.STMF, PdfName.IDENTITY);
}
else
{
stdcf.Put(PdfName.AUTHEVENT, PdfName.DOCOPEN);
dic.Put(PdfName.STRF, PdfName.STDCF);
dic.Put(PdfName.STMF, PdfName.STDCF);
}
if (revision == AES_128)
{
stdcf.Put(PdfName.CFM, PdfName.AESV2);
}
else
{
stdcf.Put(PdfName.CFM, PdfName.V2);
}
PdfDictionary cf = new PdfDictionary();
cf.Put(PdfName.STDCF, stdcf);
dic.Put(PdfName.CF, cf);
}
}
return(dic);
}
