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-.\" $OpenBSD: crypt.3,v 1.46 2025/01/09 23:18:08 jsg Exp $
-.\"
-.\" FreeSec: libcrypt
-.\"
-.\" Copyright (c) 1994 David Burren
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the author nor the names of other contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" Manual page, using -mandoc macros
-.\"
-.Dd $Mdocdate: January 9 2025 $
-.Dt CRYPT 3
-.Os
-.Sh NAME
-.Nm crypt ,
-.Nm bcrypt_gensalt ,
-.Nm bcrypt
-.Nd password hashing
-.Sh SYNOPSIS
-.In stdlib.h
-.Pp
-.In unistd.h
-.Ft char *
-.Fn crypt "const char *key" "const char *setting"
-.In pwd.h
-.Ft char *
-.Fn bcrypt_gensalt "u_int8_t log_rounds"
-.Ft char *
-.Fn bcrypt "const char *key" "const char *salt"
-.Sh DESCRIPTION
-These functions are deprecated in favor of
-.Xr crypt_checkpass 3
-and
-.Xr crypt_newhash 3 .
-.Pp
-The
-.Fn crypt
-function performs password hashing.
-Additional code has been added to deter key search attempts and to use
-stronger hashing algorithms.
-.Pp
-The first argument to
-.Fn crypt
-is a NUL-terminated
-string
-.Fa key ,
-typically a user's typed password.
-The second,
-.Fa setting ,
-currently supports a single form.
-If it begins
-with a string character
-.Pq Ql $
-and a number then a different algorithm is used depending on the number.
-At the moment
-.Ql $2
-chooses Blowfish hashing; see below for more information.
-.Ss Blowfish crypt
-The Blowfish version of crypt has 128 bits of
-.Fa salt
-in order to make building dictionaries of common passwords space consuming.
-The initial state of the
-Blowfish cipher is expanded using the
-.Fa salt
-and the
-.Fa password
-repeating the process a variable number of rounds, which is encoded in
-the password string.
-The maximum password length is 72.
-The final Blowfish password entry is created by encrypting the string
-.Pp
-.Dq OrpheanBeholderScryDoubt
-.Pp
-with the Blowfish state 64 times.
-.Pp
-The version number, the logarithm of the number of rounds and
-the concatenation of salt and hashed password are separated by the
-.Ql $
-character.
-An encoded
-.Sq 8
-would specify 256 rounds.
-A valid Blowfish password looks like this:
-.Pp
-.Dq $2b$12$FPWWO2RJ3CK4FINTw0Hi8OiPKJcX653gzSS.jqltHFMxyDmmQ0Hqq .
-.Pp
-The whole Blowfish password string is passed as
-.Fa setting
-for interpretation.
-.Sh RETURN VALUES
-The function
-.Fn crypt
-returns a pointer to the encrypted value on success, and
-.Dv NULL
-on failure.
-.Sh SEE ALSO
-.Xr encrypt 1 ,
-.Xr login 1 ,
-.Xr passwd 1 ,
-.Xr blowfish 3 ,
-.Xr crypt_checkpass 3 ,
-.Xr getpass 3 ,
-.Xr passwd 5
-.Sh HISTORY
-An M-209 based
-.Fn crypt
-function appeared in
-.At v3 .
-A DES-based
-.Fn crypt
-first appeared in
-.At v7 .
-.Fn bcrypt
-first appeared in
-.Ox 2.1 .
-.Sh BUGS
-The
-.Fn crypt
-function returns a pointer to static data, and subsequent calls to
-.Fn crypt
-will modify the same object.