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https://issues.apache.org/jira/browse/PDFBOX-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16911993#comment-16911993
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bal commented on PDFBOX-4609:
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i had implemented the signatureinterface that why signature is attached in pdf. 
i tried to implement the sign() method in the signatureinterface derived class 
but couldn't create the keystore as in java which contains the alias and the 
pin .  The bouncy castle example shows  it is used to create the pkcs 
signature,  i already have signature in pkcs format. It is not usable for me 
for the valid signature. Is another options to pass the correct input to sign 
method for valid signature? 

> At least  one signature is invalid
> ----------------------------------
>
>                 Key: PDFBOX-4609
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4609
>             Project: PDFBox
>          Issue Type: Wish
>          Components: .NET
>    Affects Versions: 1.8.15
>            Reporter: bal
>            Priority: Major
>         Attachments: Debug.txt, keystore.p12
>
>
> I am getting signature is  invalid  error in the signature panel of pdf after 
> pkcs 7 signature insertion. I can see the name of the signer with the signed 
> by in signature panel. I am not able to find out disallowed changes pdfbox 
> does resulting into invalid pdf by acrobat reader.   Is it possible to 
> validate the pdf with pdfbox? Thanks in advance. 



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