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Path: flop.mcom.com!news.Stanford.EDU!agate!library.ucla.edu!info.ucla.edu!csulb.edu!paris.ics.uci.edu!ucivax!gateway
From: moore@cs.utk.edu (Keith Moore)
Subject: Re: MIME Content-MD5 header
Message-ID: <199508140639.CAA17658@wilma.cs.utk.edu>
In-reply-to: Your message of "Fri, 11 Aug 1995 09:34:10 BST."
<Q9+PDBACYxKwIAQs@turnpike.com>
content-type: multipart/mixed; boundary="frotz"
MIME-Version: 1.0
Newsgroups: comp.mail.mime
Lines: 42
Date: 14 Aug 95 06:39:48 GMT
X-URI: http://www.cs.utk.edu/‾moore/
--frotz
content-type: text/plain; charset=us-ascii
> Thanks for the pointers to mpack/munpack - but we are left with a
> mystery. We were emailed a quoted printable message containing an MD5
> signature by Yanling Qi using "CDE dtmail". However, although our MD5
> calculations agree with mpack/munpack, I can't get either to agree with
> the Content-MD5 header on that message. (However, munpack won't directly
> decode the message so I have to decode it first and see what MD5 mpack
> puts on it when its re-encoded!).
>
> We are uncertain where the problem lies, so we would be grateful for
> some more examples of quoted printable text with Content-MD5 headers.
My guess would be that one of the implementations is not using the
canonical form for end-of-line in text/plain. The newlines in a
quoted-printable should be interpreted as 0D 0A for the purpose of
computing MD5 (as for all other purposes). I'll bet one or more of
the implementations is treating it as either just 0D or just 0A, so
you get a different MD5 value.
Here is the same file encoded twice: one in quoted-printable, another
in base64. They have the same canonical form and thus the same MD5.
See whether they get the same MD5 on your system:
--frotz
Content-type: text/plain; charset=us-ascii
content-transfer-encoding: quoted-printable
content-md5: JBUsEwk6AEsrJxeDnYDj2g==
=46rom moore@cs.utk.edu Mon Aug 14 01:49:07 1995
=46rom moore@cs.utk.edu Mon Aug 14 01:51:53 1995
=46rom moore@cs.utk.edu Mon Aug 14 02:17:26 1995
--frotz
Content-type: text/plain; charset=us-ascii
content-transfer-encoding: base64
content-md5: JBUsEwk6AEsrJxeDnYDj2g==
RnJvbSBtb29yZUBjcy51dGsuZWR1IE1vbiBBdWcgMTQgMDE6NDk6MDcgMTk5NQ0KRnJvbSBtb29y
ZUBjcy51dGsuZWR1IE1vbiBBdWcgMTQgMDE6NTE6NTMgMTk5NQ0KRnJvbSBtb29yZUBjcy51dGsu
ZWR1IE1vbiBBdWcgMTQgMDI6MTc6MjYgMTk5NQ0K
--frotz--
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