OK, I'm attaching a signed PDF and the code I'm using to obtain the revision.
But the first revision obtained with this code contains the signature field.
How can I obtain a revision without the signature field?
the code:
byte bb[] = new byte[8192];
PdfReader reader;
reader = new PdfReader(entrada);
AcroFields af = null;
ArrayList names = null;
af = reader.getAcroFields();
names = af.getSignatureNames();
for (int k = 0; k < names.size(); ++k) {
String name = (String)names.get(k);
if (af.getRevision(name)==numRevision){
InputStream ip = af.extractRevision(name);
int n = 0;
while ((n = ip.read(bb)) > 0)
out.write(bb,0,n);
ip.close();
out.close();
return;
}
}
}
Thanks for all.
http://www.nabble.com/file/p23649098/firmado2vecesOk.pdf firmado2vecesOk.pdf
mkl wrote:
>
> Oscar,
>
>
> Oscar P wrote:
>>
>> Hi again,
>>
>> thaks for all answer.
>>
>> how i can sign in append mode to obtain original PDF?
>>
>> I sign with this code:
>>
>> PdfReader reader;
>> PrivateKey privateKey = null;
>> Certificate[] chain = null;
>> privateKey = alm.getClavePrivada(alias, pwdPrivateKey);
>> chain = alm.getKeyStore().getCertificateChain(alias);
>> reader = new PdfReader(entrada);
>> PdfStamper stamper;
>> stamper = PdfStamper.createSignature(reader, salida,
>> '\0',null,true);
>> //this true is to append mode?
>>
>
> Yes, it is.
>
>
> Oscar P wrote:
>>
>> PdfSignatureAppearance appearance =
>> stamper.getSignatureAppearance();
>> appearance.setCrypto(privateKey,chain,
>> null,PdfSignatureAppearance.WINCER_SIGNED);
>> Calendar signedDate = new GregorianCalendar();
>> appearance.setSignDate(signedDate);
>> try {
>> stamper.close();
>> } catch (Exception e) {
>> throw new CifraFirmaException("Error al realizar la
>> firma, no se pudo
>> leer correctamente el PDF",e);
>> }
>>
>> When i sign i get a unique revision, and this revision include the
>> signature field.
>>
>>
>> thaks for all.
>>
>
> Yes, the revision you create includes the signature field. The document
> should also contain the former revision. I actually use a slightly
> different approach here, but yours should also have that older revision
> inside. If you're not sure, just post an example document and we'll check.
>
> Regards, Michael.
>
>
--
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