Date: Thu, 19 Jul 2001 08:10:02 -0700 (PDT) From: Dima Dorfman <dima@unixfreak.org> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/28988: We need more simple message digesting tools Message-ID: <200107191510.f6JFA2Y32641@freefall.freebsd.org>
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The following reply was made to PR bin/28988; it has been noted by GNATS. From: Dima Dorfman <dima@unixfreak.org> To: Peter Pentchev <roam@orbitel.bg> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: bin/28988: We need more simple message digesting tools Date: Thu, 19 Jul 2001 08:05:49 -0700 Peter Pentchev <roam@orbitel.bg> writes: > The following reply was made to PR bin/28988; it has been noted by GNATS. > > From: Peter Pentchev <roam@orbitel.bg> > To: Anders Nordby <anders@fix.no> > Cc: freebsd-gnats-submit@FreeBSD.org > Subject: Re: bin/28988: We need more simple message digesting tools > Date: Thu, 19 Jul 2001 17:05:00 +0300 > > On Thu, Jul 19, 2001 at 04:30:30AM -0700, Anders Nordby wrote: > > The following reply was made to PR bin/28988; it has been noted by GNATS. > > > > From: Anders Nordby <anders@fix.no> > > To: Dima Dorfman <dima@unixfreak.org> > > Cc: FreeBSD-gnats-submit@freebsd.org > > Subject: Re: bin/28988: We need more simple message digesting tools > > Date: Thu, 19 Jul 2001 13:28:57 +0200 > > > > On Mon, Jul 16, 2001 at 10:20:00PM -0700, Dima Dorfman wrote: > > >> md5(1) is just a frontend for libmd. If I make md5(1) use > > >> libcrypto instead, would that be better? > > > Why? What's wrong with: > > > > > > ln -s /usr/bin/openssl md5 > > > > The fact that md5 dgst -sha1 does not make sence, and that md5(1) is > > expected to output differently and have other options. > > It doesn't work, either. If openssl is invoked with an algorithm name, > it accepts only filenames, not commands/options. Thus, it preserves > md5(1)'s syntax (at least in this respect). > > > [roam@edge:p1 /usr/src]$ ln -s /usr/bin/openssl /usr/tmp/md5 > [roam@edge:p1 /usr/src]$ /usr/tmp/md5 /etc/passwd > MD5(/etc/passwd)= dbcf40cb4677824638143626b514ad4e > [roam@edge:p1 /usr/src]$ /usr/tmp/md5 dgst -sha1 /etc/passwd > dgst: No such file or directory > -sha1: No such file or directory > MD5(/etc/passwd)= dbcf40cb4677824638143626b514ad4e > [roam@edge:p1 /usr/src]$ Actually, it does accept arguments. Just not the same way openssl(1) does. 'dgst' is the actual program name inside OpenSSL; you can think of 'openssl md5' as being a symlink to 'openssl dgst md5'. When you make a real symlink called 'md5' to /usr/bin/openssl, you're actually making a symlink to the 'dgst' program, which is embedded inside openssl(1). You can't run other embedded programs, but you can switch algorithms. Observe: dima@hornet% ln -s /usr/bin/openssl md5 dima@hornet% ./md5 /HORNET MD5(/HORNET)= e3823deaea6ac04928da26c118a36149 dima@hornet% ./md5 -sha1 /HORNET SHA1(/HORNET)= 01539871ab3ece58b874bf47be652508a1e11649 That said, I fail to see why this is a problem. > (And before phk jumps at me, yes, I know that libmd was introduced waay > before libcrypto made it into the source tree, and yes, I know that they > have slightly different functionality - actually I even contributed some > of that difference, remember? :P .. and no, I'm not the one advocating > libmd replacement with libcrypto, just stating that some people are :) I don't know if you think I'm one of these people, but I really have no opinion on libmd. As long as things are using it, I have no problem with it staying. However, new things probably shouldn't be implemented using it. In this case, openssl(1) is almost the perfect fit: what we need is *already* implemented. Besides, when the XYZ hash becomes popular, chances are OpenSSL will implement it quickly; then, for us to have an xyz(1), all we'd have to do is create another symlink. This is certainly better than implementing XYZ in libmd. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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