Adobe Reader not validating signature with three pairs of ByteRange values

I have created a PDF with a Digital signature, when opened with Acrobat Reader 10 i see the signature not bieng validated with a message saying, "There are errors in the formatting or information contained in this signature (support information: SigDict /ByteRange value)". My signature's byterange contains three pairs of integers(/ByteRange[0 569 6417 400 6817 1013]) which seems to be causing this problem. Will appreciate any input regarding this.

How have you created the signature? If you are using a program of your own creation, please repost in the Acrobat SDK forum.

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Acrobat not validating signature with three pairs of ByteRange values

I have created a PDF with a Digital signature, when opened with Acrobat Reader 10 i see the signature not bieng validated with a message saying, "There are errors in the formatting or information contained in this signature (support information: SigDict /ByteRange value)". My signature's byterange contains three pairs of integers(/ByteRange[0 569 6417 400 6817 1013]) which seems to be causing this problem. Will appreciate any input regarding this.

Hi SindhuCT,
I can't speak for PDF-XChange Viewer as to whether or not they are correctly processing the signature. The only thing I can point out is you are hashing the bytes from the beginning of the file (byte 0) to byte 569. Then you are leaving a hole for the signature from byte 570 through byte 6416. You are then hashing from byte 6417 and marching off another 400 bytes which gets you to byte 6817. Finally you are telling Acrobat/Reader to leave a hole from byte 6817 to the end of the file at byte 7830. The problem is your got byte 6817 on both sides of the fence, as part of the signed data and as part of the second unsigned portion of the file. That's probably where your problem lies.
Yes, the PDF specification does say you can include other ranges, but it also says that it's not recommended because you are not going to be checking for all changes to the document. The specification says you should sign the entire file, less the hole for the signature contents.
Steve

Adobe Reader not validating signature with three byterange pairs

I have created a PDF with a Digital signature from my program, when opened with Acrobat Reader 10 i see the signature not bieng validated with a message saying, "There are errors in the formatting or information contained in this signature (support information: SigDict /ByteRange value)". My signature's byterange contains three pairs of integers(/ByteRange[0 569 6417 400 6817 1013]) which seems to be causing this problem. PDF-Xchange viewer works fine with the same file. It validates the signature!.. Appreciate any input regarding this.

As described in ETSI TS 102778 (PAdES), the EU standard for PDF Digital
Signatures that has been incorporated into ISO 32000-2, only a single set
of byte ranges (aka two pairs) is permitted.

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As you can see, I have added the prefix "ds" in it. Plus, the namespace won't appear in enveloping document (saml2:assertion in my case) but in the envelope of my message.
And this is my code for validating:
OMElementImpl ghj=(OMElementImpl)XMLUtils.toOM((doc.getDocumentElement()));
assertdoc=AssertionDocument.Factory.parse(ghj.getXMLStreamReader());
assertdoc2=AssertionDocument.Factory.parse(node,options);
assertdoc3=(OMElementImpl)XMLUtils.toOM((XMLUtils.newDocument(assertdoc2.newInputStream(options)).getDocumentElement()));
asdo=AssertionDocument.Factory.parse(ghj.getXMLStreamReader());
SignatureDocument sido=SignatureDocument.Factory.newInstance();
sido.setSignature(asdo.getAssertion().getSignature());
// The code above will take the signature document from the assertion document. It's made using xmlbeans with axis2
DOMValidateContext valContext = new DOMValidateContext      (cert.getPublicKey(), sido.newDomNode());
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boolean coreValidity = signature2.validate(valContext);
boolean coreValidity2 = signature2.getSignatureValue().validate(valContext);
The result is that coreValidity2 is true but coreValidity is false. I don't know where the problem could be.
Could someone help me?This is very important for me. Thanks in advance.
EDIT: I have added the next code to see if references were ok as well:
Iterator i = signature.getSignedInfo().getReferences().iterator();
     for (int j=0; i.hasNext(); j++) {
     boolean refValid = ((Reference) i.next()).validate(valContext);
     throw new Exception("ref["+j+"] validity status: " + refValid);
and the validity status is true (there was only one referenc so forget about the for loop). So if references and signature are ok. How I can get a false in boolean coreValidity = signature2.validate(valContext); ?
Thank you very much for your cooperation.
Message was edited by:
the_killer_tomato

Hi SindhuCT,
I can't speak for PDF-XChange Viewer as to whether or not they are correctly processing the signature. The only thing I can point out is you are hashing the bytes from the beginning of the file (byte 0) to byte 569. Then you are leaving a hole for the signature from byte 570 through byte 6416. You are then hashing from byte 6417 and marching off another 400 bytes which gets you to byte 6817. Finally you are telling Acrobat/Reader to leave a hole from byte 6817 to the end of the file at byte 7830. The problem is your got byte 6817 on both sides of the fence, as part of the signed data and as part of the second unsigned portion of the file. That's probably where your problem lies.
Yes, the PDF specification does say you can include other ranges, but it also says that it's not recommended because you are not going to be checking for all changes to the document. The specification says you should sign the entire file, less the hole for the signature contents.
Steve

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Adobe Reader not validating signature with three pairs of ByteRange values

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