On 03/02/10 16:48, Christian Baer wrote:
Mellow greetings!

On a box running FreeBSD 6.something (probably 6.4) the boot drive died.
I had never bothered to update it to 7 or 8, since I was planning to
build a new computer anyway. Since I hadn't done that yet and I still
needed the work of this machine, I just put in a new drive and installed
8.0.

The deal is that a script I restored from backup doesn't quite work as I
think it should. This is the part that somehow causes problems:

   !/bin/sh
   stty -echo
   read -p "Enter passphrase: " passphrase
   stty echo
   main=`echo "${passphrase}" | sha256 | cut -c 1-5`
   if [ "${main}" != "ddfab" ]; then
     echo "Wrong passphrase!"
     exit
   fi

I have typed the password in question about a gazillion times, so I am
pretty sure I got it right. But somehow the 'if' keeps kicking in.

There are two possible reasons for this:

1. I have Alzheimer's.
2. Something about the way sha256(1) and/or digest(1) or one of the
    other commands in the script react differenly than before.

Maybe there is another reason that I just don't see?

sha256 and the like cannot change because they are standard algorithms and changing them would break a lot of things.

Something else must be the problem. Maybe previous versions got newlines in the $passphrase variable or something like that? You will need to check output of every step of the script separately.

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