Op 21/08/2012 16:50, roboboot schreef:
After having read on this ml that PDF signature with iText 5.3.x causes that
the older PDF viewers couldn't correctly show the signature
Where did you read that?
The new iText supports detached signatures. Those have been around for
quite a while!
If you create a CAdES signature: that won't work on old PDF viewers.
If you want a signature to work on old viewers, you should create a CMS
signature.
Are you aware of the difference between CMS and CAdES?
You can use iText to create detached CMS (PKCS#7) signatures for
versions of Reader 4.0!
I'm not saying that would be wise, but it's possible!
Should you use an older version of iText, you'll be creating signatures
that will be either deprecated in the new ISO standard:
The /adbe.pkcs7.sha1sub filter will be deprecated in PDF 2.0.
ISO-32000-2 recommends: /"To support backward compatibility, PDF readers
should process this value for the ///SubFilter//key but PDF writers
shall not use this value for that key."/iText is a PDF writer, and since
iText 5.3.0, we no longer allow the creation of this type of signatures.
Please don't sign any documents using this sub filter anymore.
Or you will be creating signatures that use an encryption algorithm that
is forbidden in the PAdES standard: As for /adbe.x509.rsa_sha1, it will
still be available in PDF 2.0, but the underlying standard that is used
(PKCS#1) is explicitly forbidden in PAdES. We've discontinued support
for the creation of PKCS#1 signatures, so that iText-created signatures
comply with PAdES.
Surely you wouldn't want to create one of those old types of signatures?
It would be helpful if you told us where you found the disinformation.
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