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-.\" $OpenBSD: crypt_checkpass.3,v 1.12 2019/07/29 23:14:06 deraadt Exp $
-.\"
-.\" Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: July 29 2019 $
-.Dt CRYPT_CHECKPASS 3
-.Os
-.Sh NAME
-.Nm crypt_checkpass ,
-.Nm crypt_newhash
-.Nd password hashing
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn crypt_checkpass "const char *password" "const char *hash"
-.Ft int
-.Fn crypt_newhash "const char *password" "const char *pref" "char *hash" "size_t hashsize"
-.Sh DESCRIPTION
-The
-.Fn crypt_checkpass
-function simplifies checking a user's password.
-If both the
-.Fa hash
-and the
-.Fa password
-are the empty string, authentication
-is a success.
-Otherwise, the
-.Fa password
-is hashed and compared to the provided
-.Fa hash .
-If the
-.Fa hash
-is
-.Dv NULL ,
-authentication will always fail, but a default
-amount of work is performed to simulate the hashing operation.
-A successful match will return 0.
-A failure will return \-1 and set
-.Xr errno 2 .
-.Pp
-The
-.Fn crypt_newhash
-function simplifies the creation of new password hashes.
-The provided
-.Fa password
-is randomly salted and hashed and stored in
-.Fa hash .
-The size of the available space is specified by
-.Fa hashsize ,
-which should be
-.Dv _PASSWORD_LEN .
-The
-.Fa pref
-argument identifies the preferred hashing algorithm and parameters.
-Possible values are:
-.Bl -tag -width Ds
-.It Dq bcrypt,<rounds>
-The bcrypt algorithm, where the value of rounds can be between 4 and 31 and
-specifies the base 2 logarithm of the number of rounds.
-If rounds is omitted or the special value
-.Sq a ,
-an appropriate number of rounds is automatically selected based on system
-performance.
-.El
-.Sh RETURN VALUES
-.Rv -std crypt_checkpass crypt_newhash
-.Sh ERRORS
-The
-.Fn crypt_checkpass
-function sets
-.Va errno
-to
-.Er EACCES
-when authentication fails.
-.Pp
-The
-.Fn crypt_newhash
-function sets
-.Va errno
-to
-.Er EINVAL
-if
-.Fa pref
-is unsupported or insufficient space is provided.
-.Sh SEE ALSO
-.Xr crypt 3 ,
-.Xr login.conf 5 ,
-.Xr passwd 5
-.Sh HISTORY
-The function
-.Fn crypt_checkpass
-first appeared in
-.Ox 5.6 ,
-and
-.Fn crypt_newhash
-in
-.Ox 5.7 .
-.Sh AUTHORS
-.An Ted Unangst Aq Mt tedu@openbsd.org