Timestamps and Hashes
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Timestamps and Hashes
by mkl
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Hi!
When I looked at PdfPKCS7.java, I found: 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 The information from Sam might be a bit outdated, especially as SHA-1 is not really state-of-the-art anymore...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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Re: Timestamps and Hashes
by Leonard Rosenthol-3
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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 The information from Sam might be a bit outdated, especially as SHA-1 is not really state-of-the-art anymore...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. -- View this message in context: http://www.nabble.com/Timestamps-and-Hashes-tp24255283p24255283.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ _______________________________________________ iText-questions mailing list iText-questions@... https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/ ------------------------------------------------------------------------------ _______________________________________________ iText-questions mailing list iText-questions@... https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/ |
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