"+" bug in mac_key?

meepbear * meepbear at hotmail.com
Sun Aug 7 12:44:58 PDT 2005

>The code is something like:
>if (ord($a[0]) & 0x80) $a = "\x00" . $a;
>in a perl-like language. Don't bother converting to hex.

The shared secret is the result of gmp_powm() which returns a resource. How 
do you go from resource->binary MAC without converting to a numeric string 
somewhere along the line?

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