Re: Timestamps and Hashes

No, SHA1 is not required and in fact with Acrobat 9 we now default to SHA256.

Leonard

-----Original Message-----
From: mkl [mailto:mkl@...]
Sent: Monday, June 29, 2009 10:33 AM
To: itext-questions@...
Subject: [iText-questions] Timestamps and Hashes


Hi!

When I looked at PdfPKCS7.java, I found:



> // When requested, go get and add the timestamp. May throw an exception.
> // Added by Martin Brunecky, 07/12/2007 folowing Aiken Sam, 2006-11-15
> // Sam found Adobe expects time-stamped SHA1-1 of the encrypted digest
> if (tsaClient != null) {
>     byte[] tsImprint = MessageDigest.getInstance("SHA-1").digest(digest);
>

Is SHA-1 actually still required by Adobe? The information from Sam might be
a bit outdated, especially as SHA-1 is not really state-of-the-art
anymore...

Regards,   Michael.
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