-none- 2007-09-03 - By Lars Nagel (Trium)
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Hi Paulo,
Thanks for the quick reply.
> The certification can only be applied to the first signature.
What is the use of a signature that I cannot certify?
Is it not possible to sign with different keys and to certify with the
according certificates?
> Furthermore if you use PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED
the document can't be changed.
So I also cannot add a second signature, because it will change the
document necessarily?
> If you use certification it must be at least PdfSignatureAppearance.CERTIFIED
_FORM_FILLING and the second signature must be made on an existing field.
>
Is it possible to create a signature in a predefined field?
Thanks,
Lars
>> -- --Original Message-- --
>> From: itext-questions-bounces@(protected)
>> [mailto:itext-questions-bounces@(protected)] On
>> Behalf Of Lars Nagel (Trium)
>> Sent: Monday, September 03, 2007 3:48 PM
>> To: Post all your questions about iText here
>> Subject: [iText-questions] Problems with multiple signatures
>>
>> Hi all,
>>
>> When signing a PDF document twice, Acrobat 7.0 does not
>> accept the first
>> signature, because of changes by the second signature.
>>
>> My code looks as follows. The PDF document at pathDocument is signed
>> twice, the resulting document at pathResult2 is then opened
>> in Acrobat
>> 7.0. Acrobat 7.0 has the root certificate and tries to verify
>> using the
>> root certificate and the certificate delivered with the PDF
>> document. It
>> works fine for the second signature, but not for the first
>> one (Acrobat:
>> "Certification INVALID" and "The document has been altered or
>> corrupted
>> since the Certification was applied").
>>
>> Have you any idea? Is
>> PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED too strict maybe?
>>
>> Thanks in advance,
>> Lars
>>
>>
>> KeyStore ks1 = loadKeyStore(pathKeyStore1);
>> PrivateKey key1 = (PrivateKey)ks.getKey(alias1,
>> password1.toCharArray());
>> Certificate[] chain1 = ks.getCertificateChain(alias1);
>> PdfReader reader1 = new PdfReader(pathDocument);
>> FileOutputStream fout1 = new FileOutputStream(pathResult1);
>> PdfStamper stp1 = PdfStamper.createSignature(reader1, fout1,
>> '\0', null,
>> true);
>> PdfSignatureAppearance sap1 = stp1.getSignatureAppearance();
>> sap1.setCrypto(key1, chain1, null,
>> PdfSignatureAppearance.WINCER_SIGNED);
>> sap1.setReason("reason1");
>> sap1.setLocation("location1");
>> sap1.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO
>> _CHANGES_ALLOWED);
>> stp1.close();
>>
>> KeyStore ks2 = loadKeyStore(pathKeyStore2);
>> PrivateKey key2 = (PrivateKey)ks.getKey(alias2,
>> password2.toCharArray());
>> Certificate[] chain2 = ks.getCertificateChain(alias2);
>> PdfReader reader2 = new PdfReader(pathResult1);
>> FileOutputStream fout2 = new FileOutputStream(pathResult2);
>> PdfStamper stp2 = PdfStamper.createSignature(reader2, fout2,
>> '\0', null,
>> true);
>> PdfSignatureAppearance sap2 = stp2.getSignatureAppearance();
>> sap2.setCrypto(key2, chain2, null,
>> PdfSignatureAppearance.WINCER_SIGNED);
>> sap2.setReason("reason2");
>> sap2.setLocation("location2");
>> sap2.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_NO
>> _CHANGES_ALLOWED);
>> stp2.close();
>>
>>
>>
>> --
>> Lars Nagel
>>
>> Trium Analysis Online GmbH
>> Hohenlindenerstr. 1
>> 81677 M?nchen
>>
>> Fon : +49 89 2060269 21
>> Fax : +49 89 2060269 11
>> Internet: www.trium.de
>>
>> Amtsgericht Muenchen, HRB 134012
>> Managing Directors:
>> Dr. Martin Daumer, Michael Scholz
>>
>
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--
Lars Nagel
Trium Analysis Online GmbH
Hohenlindenerstr. 1
81677 M?nchen
Fon : +49 89 2060269 21
Fax : +49 89 2060269 11
Internet: www.trium.de
Amtsgericht Muenchen, HRB 134012
Managing Directors:
Dr. Martin Daumer, Michael Scholz
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- -----
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
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