private void SaveDocMDP(TPdfStream DataStream, TXRefSection XRef)
{
BeginDictionary(DataStream);
SaveKey(DataStream, TPdfToken.TypeName, TPdfTokens.GetString(TPdfToken.SigRefName));
SaveKey(DataStream, TPdfToken.TransformMethodName, TPdfTokens.GetString(TPdfToken.DocMDPName));
SaveTransformParams(DataStream);
SaveKey(DataStream, TPdfToken.DigestMethodName, TPdfTokens.GetString(TPdfToken.MD5Name));
//This is a small hack. We don't have an object model of the pdf file able to compute the object hash,
//and it is not needed anyway for Acrobat >=7 (and <6 does not allow MDP anyway).
//But we need to write something here, or acrobat will complain the document is not PDF/SigQ complaint.
byte[] MDPHash = new byte[16];
string MDPHashStr = PdfConv.ToHexString(MDPHash, true);
Write(DataStream, TPdfTokens.GetString(TPdfToken.DigestValueName));
long StartMDPHash = DataStream.Position;
Write(DataStream, MDPHashStr);
string LocationString =
TPdfTokens.GetString(TPdfToken.OpenArray) +
String.Format(CultureInfo.InvariantCulture, "{0} {1}", StartMDPHash, MDPHashStr.Length) +
TPdfTokens.GetString(TPdfToken.CloseArray);
SaveKey(DataStream, TPdfToken.DigestLocationName, LocationString);
EndDictionary(DataStream);
}
internal void GoReal(byte[] AfterSign, int PKCSSize)
{
Debug.Assert(HelperStream != null);
Signer.Write(AfterSign, 0, AfterSign.Length);
if (PKCSSize + AfterSign.Length > SignOffset)
{
PdfMessages.ThrowException(PdfErr.ErrSigningLengthToSmall);
}
byte[] PaddedByteCount = Pad(0x20, SignOffset - (PKCSSize + AfterSign.Length));
Signer.Write(PaddedByteCount, 0, PaddedByteCount.Length);
byte[] bt = HelperStream.CurrentStream.ToArray();
HelperStream.Dispose();
HelperStream = null;
Signer.Write(bt, 0, bt.Length);
byte[] sg = Signer.GetSignature();
byte[] hexsg = TPdfBaseRecord.Coder.GetBytes("<" + PdfConv.ToHexString(sg, false));
FDataStream.Write(hexsg, 0, hexsg.Length);
if (hexsg.Length > PKCSSize - 1)
{
PdfMessages.ThrowException(PdfErr.ErrSigningLengthToSmall);
}
for (int i = hexsg.Length; i < PKCSSize - 1; i++) //pad the certificate.
{
FDataStream.WriteByte(0);
}
FDataStream.Write(TPdfBaseRecord.Coder.GetBytes(">"), 0, 1);
FDataStream.Write(AfterSign, 0, AfterSign.Length);
FDataStream.Write(PaddedByteCount, 0, PaddedByteCount.Length); //Pad the whole thing.
FDataStream.Write(bt, 0, bt.Length);
}
internal static void SaveToStream(TPdfStream DataStream, TXRefSection XRef, int CatalogId, int InfoId)
{
TPdfBaseRecord.WriteLine(DataStream, TPdfTokens.GetString(TPdfToken.Trailer));
TDictionaryRecord.BeginDictionary(DataStream);
TDictionaryRecord.SaveKey(DataStream, TPdfToken.SizeName, XRef.Count);
TDictionaryRecord.SaveKey(DataStream, TPdfToken.RootName, TIndirectRecord.GetCallObj(CatalogId));
TDictionaryRecord.SaveKey(DataStream, TPdfToken.InfoName, TIndirectRecord.GetCallObj(InfoId));
Byte[] FileIdBytes = Guid.NewGuid().ToByteArray();
string FileId = PdfConv.ToHexString(FileIdBytes, true);
TDictionaryRecord.SaveKey(DataStream, TPdfToken.IDName,
TPdfTokens.GetString(TPdfToken.OpenArray) +
FileId + " " + FileId +
TPdfTokens.GetString(TPdfToken.CloseArray));
TDictionaryRecord.EndDictionary(DataStream);
TPdfBaseRecord.WriteLine(DataStream, TPdfTokens.GetString(TPdfToken.StartXRef));
TPdfBaseRecord.WriteLine(DataStream, XRef.StartPosition.ToString(CultureInfo.InvariantCulture));
TPdfBaseRecord.WriteLine(DataStream, TPdfTokens.GetString(TPdfToken.Eof));
}
