David Bear wrote:
> I am trying to translate some perl code to python and I need some
> advice on making fixed sized strings.
looks like you're reimplementing HMAC; there's no need to do that in
Python, really, since it's part of the standard library:
http://docs.python.org/lib/module-hmac.html
pass in hashlib.sha1 instead of the default, and you're done.
if you insist on doing it yourself, read on:
> my $ipad = chr(0x36)x$blen;
> my $opad = chr(0x5c)x$blen;
>
> I don't know if I ever seen any way in python of created a fixed size
> string. Can anyone show me how to implement the same statements in python?
just remove all the junk, and use multiply instead of "x":
ipad = chr(0x36) * blen
opad = chr(0x5c) * blen
however, Python strings are not mutable, so to implement the rest of
that algorithm, you probably want to use a list or array object instead.
the md5-example-4.py script on this page shows one way to do that:
http://effbot.org/librarybook/md5.htm
to get a SHA-1 hmac, you have to replace "md5" with "sha".
</F>
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