crypt_unix(5) Standards, Environments, and Macros crypt_unix(5)NAMEcrypt_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 provided
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 varia‐
tions 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 algorithm 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 ALSOpasswd(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)SunOS 5.10 6 Aug 2003 crypt_unix(5)
