osx man page for crypt_unix

crypt_unix(5)						Standards, Environments, and Macros					     crypt_unix(5)

NAME
       crypt_unix - traditional UNIX crypt algorithm

DESCRIPTION
       The  crypt_unix algorithm is the traditional UNIX crypt algorithm. It is not considered sufficiently secure for current systems and is pro-
       vided for backwards compatibility. The crypt_sunmd5(5), crypt_bsdmd5(5), or crypt_bsdbf(5) algorithm should be used instead.

       The algorithm identifier for policy.conf(4) is __unix__. There is no entry in crypt.conf(4) for this algorithm.

       The crypt_unix algorithm is internal to libc and provides the string encoding function used by crypt(3C) when the first	character  of  the
       salt is not a "$".

       This algorithm is based on a one-way encryption algorithm with variations intended (among other things) to frustrate use of hardware imple-
       mentations of a key search.  Only the first eight characters of the key passed to crypt() are  used  with  this	algorithm;  the  rest  are
       silently  ignored.  The salt is a two-character string chosen from the set [a-zA-Z0-9./].  This string is used to perturb the hashing algo-
       rithm in one of 4096 different ways.

       The maximum password length for crypt_unix is 8 characters.

USAGE
       The return value of the crypt_unix algorithm might not be portable among standard-conforming systems. See standards(5).

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       passwd(1), crypt(3C), crypt_genhash_impl(3C), crypt_gensalt(3C), crypt_gensalt_impl(3C), getpassphrase(3C), crypt.conf(4), passwd(4),  pol-
       icy.conf(4), attributes(5), crypt_bsdbf(5), crypt_bsdmd5(5), crypt_sunmd5(5), standards(5)

SunOS 5.10							    6 Aug 2003							     crypt_unix(5)