I have trouble finding a library capable for digital signing PDF.
I was able to create .Net app for signing but now I need dll that will work without .Net framework.
Does anyone knows good lightweight library for that? Commercial/NonCommercial
Asked
Active
Viewed 631 times
1
-
What platform do you need it for? For Windows you can use our SecureBlackbox (VCL, ActiveX or Library edition would work), PDFBlackbox package. – Eugene Mayevski 'Callback Jan 03 '13 at 12:30
-
Windows is platform. SecureBlackbox is too large :( almost 10MB [libsbb.dll](http://eldos.com/files/sbbx/secbboxlib_win.zip) – Nikola Loncar Jan 03 '13 at 12:50
-
unfortunately, yes, at the moment everything is packed into single DLL which is quite large. Also there was my mistake - PDFBlackbox is not available as ActiveX. If you know pascal, VCL edition is a good option. – Eugene Mayevski 'Callback Jan 03 '13 at 12:51
-
What about iTextSharp (1.286K)? See http://itextpdf.com/book/digitalsignatures for the documentation. Download the C# examples here: http://sourceforge.net/p/itextsharp/code/HEAD/tree/tutorial/signatures/ – Bruno Lowagie Jan 03 '13 at 17:26
-
@BrunoLowagie That is a .Net dll, I am looking for non .net library. – Nikola Loncar Jan 04 '13 at 14:20
-
Aha, I'm a Java developer; I'm not familiar with the difference between .net and other DLLs. Sorry. – Bruno Lowagie Jan 05 '13 at 10:14
-
@BrunoLowagie and how do you develop iTextSharp then, without knowing Windows? – Eugene Mayevski 'Callback Jan 07 '13 at 20:09
-
iTextSharp is ported from iText. Its development is funded with the revenue made with iText. – Bruno Lowagie Jan 08 '13 at 07:11
1 Answers
0
I am not sure if it classifies as "lightweight", but you could try with Amyuni PDF Creator ActiveX (commercial). You can use it from C++, Delphi, VB etc. The current version (4.5) takes about 4.7Mb.
Take a look at the documentation for the method DigitalSignature for more details.
Sample code in VB from the documentation:
Private Sub cmdSingDocument_Click ()
With PDFCreactiveX1
.Open( "document.pdf", "" )
.DigitalSignature("Amyuni Dev Signature", "Testing",
"signatureImage.jpg", "Montreal", 1, 100, 100, 400, 200, 1 + 2 + 4 + 8)
.Save("signed.pdf", "" )
End With
End Sub
Usual disclaimer applies.
yms
- 10,361
- 3
- 38
- 68
-
Something completely different: On [documentation](http://stackoverflow.com/documentation/pdf/5161/integrated-pdf-signatures/18525/the-signed-byte-range#t=201610210600075019686) you claimed "I have seen PDF signatures with the byte-range specified for the page contents only. They worked just fine in Acrobat Reader." There is no way to ask back there, so I do it here in a comment: Can you share a sample file for that? It should not be possible, at least not interoperably in current Reader versions – mkl Oct 21 '16 at 06:09
-
@mkl I am no longer working in the pdf field, so I lost access to the files database that had those samples. The interoperability however I cannot garantee it, it may very well not work anymore on most recent readers. This was about 4 years ago, by the time I wrote this: http://stackoverflow.com/questions/12074543/comparing-a-signed-pdf-to-an-unsigned-pdf-using-document-hash/12957758#12957758 – yms Oct 21 '16 at 14:38
-
At the bottom of that answer you mention you quote from a PDF Reference concerning an object digest. If the signatures you saw signing a single page only were actually object digest signatures, not byte range digest signatures, that would make sense to me. Object digest signatures did not make it into the ISO specification. – mkl Oct 21 '16 at 17:20