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); }