checkpw - 1.02-3 main

checkpw is an implementation of the checkpassword interface that checks a
password against a ``.password'' file in the user's Maildir. The password
file has read and write permissions to the user only.
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The code is in the public domain.
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The original checkpassword program and interface specification is written
by D. J. Bernstein:
http://cr.yp.to/checkpwd.html