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crypt_unix(7)

Standards, Environments, Macros, Character Sets, and miscellany
                                                                 crypt_unix(7)



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  provided
       for  backward  compatibility.  The crypt_sha512(7), crypt_sha256(7), or
       crypt_bsdbf(7) algorithm should be used instead.


       The algorithm identifier for policy.conf(5) is __unix__.  There  is  no
       entry in crypt.conf(5) 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(7).

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/library _ Interface StabilityCommit‐
       ted


SEE ALSO
       passwd(1), crypt_gensalt(3C), getpassphrase(3C), crypt(3C),  crypt_gen‐
       hash_impl(3C),  crypt_gensalt_impl(3C),  crypt.conf(5), passwd(5), pol‐
       icy.conf(5),    attributes(7),     crypt_bsdbf(7),     crypt_sha256(7),
       crypt_sha512(7), standards(7)

HISTORY
       This  algorithm has been included in all releases of SunOS and Solaris.
       It was the only algorithm supported by the crypt() function until  sup‐
       port  for  pluggable  crypt  modules  was added to Solaris in Solaris 9
       12/02 (Update 2). It  was  the  CRYPT_DEFAULT  setting  in  policy.conf
       before Solaris 11.0.



Oracle Solaris 11.4               21 Jun 2021                    crypt_unix(7)
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