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To: cs551@merlot.usc.edu
Subject: Re: Error in MD5 Output
Date: Wed, 10 Sep 2008 22:02:52 -0700
From: Bill Cheng <william@bourbon.usc.edu>

Someone wrote:

  > I compute the md5 on both the server and client side for debugging purposes
  > and they were the same, but they differ from the output of "openssl md5
  > filename". I looked in the debugger and the output I am printing does seem
  > to be correct. The filesizes and bytes transferred are correct as well.
  > Furthermore it worked fine on cygwin. I did notice that the filesizes are
  > different on cygwin than they are on nunki. 

As I've mentioned in my message on "Thu 04 Sep 09:11", your
bug is in your print routine!  If you look at the first byte
of your output, you will see that instead of print "02", you
printed "2".  You need to print a leading "0" if the byte is
less than 0x10.
--
Bill Cheng // bill.cheng@usc.edu <URL:http://merlot.usc.edu/william/usc/>



  

-----Original Message-----
From: Bill Cheng [mailto:william@bourbon.usc.edu] 
Sent: Wednesday, September 10, 2008 7:55 AM
To: cs551@merlot.usc.edu
Subject: Re: Error in MD5 Output

Someone wrote:

  > Hi,I having some prob with the o/p of MD5.
  > I compared it with the o/p generated by the openssl/md5
  >
  > My o/p is../
  > nunki.usc.edu(12): ./client get -m nunki.usc.edu:15272 /etc/passwd
  > 26a948ab7bd6d3ab622ac9d6e1fe26
  >
  > O/P of OpenSSL / MD5 is
  >
  > nunki.usc.edu(13): ~csci551b/bin/filemd5 /etc/passwd
  > 026a948ab7bd6d3ab622ac9d6e1f0e26
  >
  > It seems, all 0 (zeros) are ignored from my o/p. (at two places)
  > Any idea why this happens?

Please see my message on "Thu 04 Sep 09:11".
--
Bill Cheng // bill.cheng@usc.edu <URL:http://merlot.usc.edu/william/usc/>