08-24-2012
There are many free clones of crypt:
crypt open source code - Google Search
Make sure you are putting the master password and user passwords in secure places. All apps and systems have their hidden secrets and keys. This may be a good place for Public/Private Key Encryption. Lots written about the security challenges of any authentication system. Authentication is often that the encrypted trial password matches the encrypted stored password, so every raw password is only a transient memory artifact in automatic variables.
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crypt(3C) crypt(3C)
NAME
crypt - generate hashing encryption
SYNOPSIS
Obsolescent Interfaces
DESCRIPTION
crypt():
is the password encryption function. It is based on a one way hashing encryption algorithm with variations intended (among other things)
to frustrate use of hardware implementations of a key search.
key is a user's typed password. salt is a two-character string chosen from the set this string is used to perturb the hashing algorithm in
one of 4096 different ways, after which the password is used as the key to encrypt repeatedly a constant string. The returned value points
to the encrypted password. The first two characters are the salt itself.
Obsolescent Interfaces
generate hashing encryption.
WARNINGS
The return value for points to data whose content is overwritten by each call.
and are obsolescent interfaces supported only for compatibility with existing DCE applications. New multithreaded applications should use
SEE ALSO
crypt(1), login(1), passwd(1), getpass(3C), passwd(4), thread_safety(5).
STANDARDS CONFORMANCE
crypt(3C)