[ale] Verifying a MD5 password?

[Robert.L.Harris at rdlg.net (Robert L. Harris)]

We're trying to write a script that can verify passwords against md5
password entries.  We've got a good mechanism to get the password from
/etc/shadow but something in the actual computation of the md5 hash of
the user input is not right.

Anyone have a good command line or HOWTO I can read through?

A couple combinations we've tried:

salt=spudpeel
password=foo

#
echo -n "foospudpeel" | openssl md5 -binary | openssl base64
u9FAH8zsyXmwYX3pBqLd6Q==

# trying with a base64 encoded salt
echo -n "foodc3B1ZHBlZWw=" | openssl md5 -binary | openssl base64
JmyoP+AVagwGzN0uLF4Mow==


We've only found a couple docs on how the md5 password hash's are
generated, nothing that flat out says "do x, do y, do z, shove it in a
file"...

Robert



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