internal TSignedStream(Stream aDataStream, TPdfSigner aSigner)
{
FDataStream = aDataStream;
Signer = aSigner;
HelperStream = null;
SignOffset = 0;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (HelperStream != null)
{
HelperStream.Dispose();
}
HelperStream = null;
}
base.Dispose(disposing);
}
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 void GoVirtual(int aSignOffset)
{
Debug.Assert(HelperStream == null);
SignOffset = aSignOffset;
HelperStream = new THelperStream(FDataStream);
}
