Closed machanics closed 4 years ago
Can you share the pdf you are using? I think I know what happens, before signing a "placeHolder" is added that allows us to size where the signature will be placed. If it is not dimensioned with the bytes that correspond to the length of the signature, the error it mentions occurs.
Good afternoon, I figured out this problem yesterday. If there is more than 1 signature in the document, there must be a mandatory ID value
trailer
<< /Size 8
/Root 1 0 R
/ID [ <F7D77B3D22B9F92829D49FF5D78B8F28>
<F7D77B3D22B9F92829D49FF5D78B8F28> ]
>>
startxref
97631
%%EOF
I think it would be nice to add a check to the function plainAddPlaceholder
About the /ID attibute, please read this answer: https://stackoverflow.com/a/20091203/2528232
Could #75 and #76 be related here?
Any additional findings on the /ID attribute, @mechanics?
Yes, this problem has a lot to do with the 'issues' mentioned above.
Now that it has been resolved but now we have another problem, I see that this new problem has been mentioned in several cases but it has not been completely resolved.
When reviewing the Buffer, I have noticed something, I want to get rid of the doubts.
Can't the objects created by each tag be repeated?
Because if the answer is negative, then there is an error in the location of the placeholder
.
I see that the /Type /AcroForm
object is occupying the identifier 26 0 obj
, this identifier was already occupied almost at the beginning of the PDF.
And this object is on the page that has been removed from the PDF and I get the error that it cannot validate the signature.
If the object identifiers cannot be repeated, then there is an error putting the AcroForm
signature.
I am right?
Or, I think the 2 AcroForm
signatures should carry the same object ID, right?
I also mentioned this in this isuue which was closed. @vbuch, Can you help me with this concern?
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Hello! Tell me how to sign a document 2 times ? after signing, the first signature becomes invalid (signature byte range is invalid)