You need at least 2.1.7 and other corrections were introduced in 5.0.x.

From: D'Angelo, Adam []
Sent: Monday, November 29, 2010 5:44 PM
Subject: [iText-questions] Acroform verifySignature() PdfPKCS7 error with SHA256 in iText 2.1.3

We are currently using iText 2.1.3 to pull an Entrust certificate from a PDF.  Up until recently the encryption of these certs has been SHA1.  However, due to pending security infrastructure changes, all certificates will be SHA256 going forward.  While testing with the newer SHA256 Entrust certs we receive the following error:


com.lowagie.text.ExceptionConverter: 2.16.840. MessageDigest not available


This error is thrown from this line of code:


//form is an AcroFields form

PdfPKCS7 pk = form.verifySignature(signatureFieldName);


What version of iText supports SHA256?  Is there a way to resolve this issue without updating the version of iText we are using?




Adam D'Angelo, PMP |


Aviso Legal:
Esta mensagem é destinada exclusivamente ao destinatário. Pode conter informação confidencial ou legalmente protegida. A incorrecta transmissão desta mensagem não significa a perca de confidencialidade. Se esta mensagem for recebida por engano, por favor envie-a de volta para o remetente e apague-a do seu sistema de imediato. É proibido a qualquer pessoa que não o destinatário de usar, revelar ou distribuir qualquer parte desta mensagem.

This message is destined exclusively to the intended receiver. It may contain confidential or legally protected information. The incorrect transmission of this message does not mean the loss of its confidentiality. If this message is received by mistake, please send it back to the sender and delete it from your system immediately. It is forbidden to any person who is not the intended receiver to use, distribute or copy any part of this message.