1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
151 lines
4.0 KiB
Groff
151 lines
4.0 KiB
Groff
.\" FreeSec: libcrypt for NetBSD
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.\"
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.\" Copyright (c) 1994 David Burren
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the author nor the names of other contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\" Manual page, using -mandoc macros
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.\"
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.Dd March 9, 1994
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.Dt CIPHER 3
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.Os "FreeSec 1.0"
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.Sh NAME
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.Nm setkey ,
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.Nm encrypt ,
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.Nm des_setkey ,
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.Nm des_cipher ,
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.Nd DES encryption
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.Sh SYNOPSIS
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.Ft int
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.Fn setkey "char *key"
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.Ft int
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.Fn encrypt "char *block" "int flag"
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.Ft int
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.Fn des_setkey "const char *key"
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.Ft int
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.Fn des_cipher "const char *in" "char *out" "long salt" "int count"
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.Sh DESCRIPTION
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The functions,
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.Fn encrypt ,
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.Fn setkey ,
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.Fn des_setkey
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and
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.Fn des_cipher
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provide access to the
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.Tn DES
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algorithm.
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.Fn setkey
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is passed a 64-byte array of binary values (numeric 0 or 1).
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A 56-bit key is extracted from this array by dividing the
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array into groups of 8, and ignoring the last bit in each group.
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That bit is reserved for a byte parity check by DES, but is ignored
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by these functions.
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.Pp
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The
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.Fa block
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argument to
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.Fn encrypt
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is also a 64-byte array of binary values.
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If the value of
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.Fa flag
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is 0,
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.Fa block
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is encrypted otherwise it is decrypted.
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The result is returned in the original array
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.Fa block
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after using the key specified by
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.Fn setkey
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to process it.
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.Pp
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The argument to
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.Fn des_setkey
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is a character array of length 8.
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The least significant bit (the parity bit) in each character is ignored,
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and the remaining bits are concatenated to form a 56-bit key.
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The function
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.Fn des_cipher
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encrypts (or decrypts if
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.Fa count
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is negative) the 64-bits stored in the 8 characters at
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.Fa in
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using
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.Xr abs 3
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of
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.Fa count
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iterations of
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.Tn DES
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and stores the 64-bit result in the 8 characters at
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.Fa out
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(which may be the same as
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.Fa in
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).
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The
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.Fa salt
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introduces disorder in the
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.Tn DES
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algorithm in one of 16777216 or 4096 possible ways
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(ie. with 24 or 12 bits: if bit
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.Em i
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of the
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.Ar salt
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is set, then bits
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.Em i
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and
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.Em i+24
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are swapped in the
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.Tn DES
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E-box output).
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.Pp
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The functions
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.Fn setkey ,
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.Fn encrypt ,
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.Fn des_setkey ,
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and
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.Fn des_cipher
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return 0 on success and 1 on failure.
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.Pp
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The
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.Fn setkey
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and
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.Fn des_setkey
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functions manipulate the same key space.
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr passwd 1 ,
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.Xr crypt 3 ,
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.Xr getpass 3 ,
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.Xr passwd 5
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.Sh HISTORY
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This library (FreeSec 1.0) was developed outside the United States of America
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as an unencumbered replacement for the U.S.-only NetBSD libcrypt encryption
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library.
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Users should be aware that this code (and programs staticly linked with it)
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may not be exported from the U.S., although it apparently can be imported.
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.Sh AUTHOR
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David Burren <davidb@werj.com.au>
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