'\" te
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.TH CRYPT_UNIX 7 "Aug 6, 2003"
.SH NAME
crypt_unix \- traditional UNIX crypt algorithm
.SH DESCRIPTION
.sp
.LP
The \fBcrypt_unix\fR algorithm is the traditional UNIX crypt algorithm. It is
not considered sufficiently secure for current systems and is provided for
backwards compatibility. The \fBcrypt_sunmd5\fR(7), \fBcrypt_bsdmd5\fR(7), or
\fBcrypt_bsdbf\fR(7) algorithm should be used instead.
.sp
.LP
The algorithm identifier for \fBpolicy.conf\fR(5) is \fB__unix__\fR. There is
no entry in \fBcrypt.conf\fR(5) for this algorithm.
.sp
.LP
The \fBcrypt_unix\fR algorithm is internal to \fBlibc\fR and provides the
string encoding function used by \fBcrypt\fR(3C) when the first character of
the salt is not a "$".
.sp
.LP
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 \fBcrypt()\fR
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.
.sp
.LP
The maximum password length for \fBcrypt_unix\fR is 8 characters.
.SH USAGE
.sp
.LP
The return value of the \fBcrypt_unix\fR algorithm might not be portable among
standard-conforming systems. See \fBstandards\fR(7).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
MT-Level	Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR passwd (1),
.BR crypt (3C),
.BR crypt_genhash_impl (3C),
.BR crypt_gensalt (3C),
.BR crypt_gensalt_impl (3C),
.BR getpassphrase (3C),
.BR crypt.conf (5),
.BR passwd (5),
.BR policy.conf (5),
.BR attributes (7),
.BR crypt_bsdbf (7),
.BR crypt_bsdmd5 (7),
.BR crypt_sunmd5 (7),
.BR standards (7)