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-.\" FreeSec: libcrypt for NetBSD
-.\"
-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.\" Manual page, using -mandoc macros
-.\"
-.Dd March 9, 1994
-.Dt CIPHER 3
-.Os
-.Sh NAME
-.Nm setkey ,
-.Nm encrypt ,
-.Nm des_setkey ,
-.Nm des_cipher
-.Nd DES encryption
-.Sh LIBRARY
-.Lb libcipher
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn setkey "const char *key"
-.Ft int
-.Fn encrypt "char *block" "int flag"
-.Ft int
-.Fn des_setkey "const char *key"
-.Ft int
-.Fn des_cipher "const char *in" "char *out" "long salt" "int count"
-.Sh DESCRIPTION
-The functions,
-.Fn encrypt ,
-.Fn setkey ,
-.Fn des_setkey
-and
-.Fn des_cipher
-provide access to the
-.Tn DES
-algorithm.
-.Fn setkey
-is passed a 64-byte array of binary values (numeric 0 or 1).
-A 56-bit key is extracted from this array by dividing the
-array into groups of 8, and ignoring the last bit in each group.
-That bit is reserved for a byte parity check by DES, but is ignored
-by these functions.
-.Pp
-The
-.Fa block
-argument to
-.Fn encrypt
-is also a 64-byte array of binary values.
-If the value of
-.Fa flag
-is 0,
-.Fa block
-is encrypted otherwise it is decrypted.
-The result is returned in the original array
-.Fa block
-after using the key specified by
-.Fn setkey
-to process it.
-.Pp
-The argument to
-.Fn des_setkey
-is a character array of length 8.
-The least significant bit (the parity bit) in each character is ignored,
-and the remaining bits are concatenated to form a 56-bit key.
-The function
-.Fn des_cipher
-encrypts (or decrypts if
-.Fa count
-is negative) the 64-bits stored in the 8 characters at
-.Fa in
-using
-.Xr abs 3
-of
-.Fa count
-iterations of
-.Tn DES
-and stores the 64-bit result in the 8 characters at
-.Fa out
-(which may be the same as
-.Fa in ) .
-The
-.Fa salt
-introduces disorder in the
-.Tn DES
-algorithm in one of 16777216 or 4096 possible ways
-(ie. with 24 or 12 bits: if bit
-.Em i
-of the
-.Ar salt
-is set, then bits
-.Em i
-and
-.Em i+24
-are swapped in the
-.Tn DES
-E-box output).
-.Pp
-The functions
-.Fn setkey ,
-.Fn encrypt ,
-.Fn des_setkey ,
-and
-.Fn des_cipher
-return 0 on success and 1 on failure.
-.Pp
-The
-.Fn setkey
-and
-.Fn des_setkey
-functions manipulate the same key space.
-.Sh SEE ALSO
-.Xr login 1 ,
-.Xr passwd 1 ,
-.Xr crypt 3 ,
-.Xr getpass 3 ,
-.Xr passwd 5
-.Sh HISTORY
-This library (FreeSec 1.0) was developed outside the United States of America
-as an unencumbered replacement for the U.S.-only
-.Nx
-libcrypt encryption
-library.
-Users should be aware that this code (and programs staticly linked with it)
-may not be exported from the U.S., although it apparently can be imported.
-.Sh AUTHORS
-.An David Burren Aq davidb@werj.com.au
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