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I've verified that the patent has expired, but don't know how to document it. Here are the steps:

• Go to: https://ramps.uspto.gov/eram/patentMaintFees.do
• Use patent and application numbers from: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4908861 (PN: 4908861; AN: 07090633)
• Click "Get Bibliographic Data"

Patent Bibliographic Data - 11/06/2007 11:02 AM
Patent Number: 4908861
Application Number: 07090633
Issue Date: 03/13/1990
Filing Date: 08/28/1987
Title: DATA AUTHENTICATION USING MODIFICATION DETECTION CODES BASED ON A PUBL
Status: Expired for non-payment on: 03/13/2002

-- 128.221.197.20 16:07, 6 November 2007 (UTC) reply

I added a reference for this, but the OpenSSL fact should still be sourced and cleaned up. As of now it's still contradictory, but at least there's a reference that it expired. Thanks. 71.142.208.226 ( talk) 09:19, 31 January 2008 (UTC) reply

Are the strings in the example zero-terminated? 71.142.208.226 ( talk) 08:36, 31 January 2008 (UTC) reply

In a sense they are: All strings are padded with zeros until they reach a multiple of the blocksize (8 bytes). As none of them already are a multiple of the blocksize, at least one zero is added. 93.159.251.115 ( talk) 14:46, 28 November 2018 (UTC) reply