crypt_unix(5)
NAME
crypt_unix - traditional UNIX crypt algorithm
DESCRIPTION
The crypt_unix algorithm is the traditional UNIX crypt algo-
rithm. It is not considered sufficiently secure for current
systems and is provided for backwards compatibility. The
crypt_sunmd5(5), crypt_bsdmd5(5), or crypt_bsdbf(5) algo-
rithm 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 implementations 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 algorithm in one
of 4096 different ways.
USAGE
The return value of the crypt_unix algorithm might not be
portable among standard-conforming systems. See stan-
dards(5).
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| 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), policy.conf(4),
attributes(5), crypt_bsdbf(5), crypt_bsdmd5(5),
crypt_sunmd5(5), standards(5)
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