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-.\" $OpenBSD: crypt.3,v 1.5 1996/12/10 09:06:09 deraadt 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 March 9, 1994
-.Dt CRYPT 3
-.Os "FreeSec 1.0"
-.Sh NAME
-.Nm crypt ,
-.Nm encrypt ,
-.Nm setkey
-.Nd DES encryption
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft char *
-.Fo crypt
-.Fa "const char *key"
-.Fa "const char *salt"
-.Fc
-.Ft void
-.Fo encrypt
-.Fa "char *block"
-.Fa "int edflag"
-.Fc
-.Fd #include <stdlib.h>
-.Ft void
-.Fo setkey
-.Fa "const char *key"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn crypt
-function performs password encryption, based on the
-.Tn NBS
-Data Encryption Standard (DES).
-Additional code has been added to deter key search attempts.
-The first argument to
-.Fn crypt
-is a
-.Dv null Ns -terminated
-string, typically a user's typed password.
-The second is in one of two forms:
-if it begins with an underscore (``_''), an extended format is used
-in interpreting both the key and the salt value, as outlined below.
-.Ss Extended crypt:
-.Pp
-The
-.Ar key
-is divided into groups of 8 characters (the last group is null-padded)
-and the low-order 7 bits of each each character (56 bits per group) are
-used to form the DES key as follows:
-the first group of 56 bits becomes the initial DES key.
-For each additional group, the XOR of the encryption of the current DES
-key with itself and the group bits becomes the next DES key.
-.Pp
-The
-.Ar salt
-is a 9-character array consisting of an underscore, followed
-by 4 bytes of iteration count and 4 bytes of salt.
-These are encoded as printable characters, 6 bits per character,
-least significant character first.
-The values 0 to 63 are encoded as ``./0-9A-Za-z''.
-This allows 24 bits for both
-.Fa count
-and
-.Fa salt .
-.Ss "Traditional" crypt:
-.Pp
-The first 8 bytes of the key are null-padded, and the low-order 7 bits of
-each character is used to form the 56-bit
-.Tn DES
-key.
-.Pp
-The
-.Fa salt
-is a 2-character array of the ASCII-encoded salt.
-Thus, only 12 bits of salt are used.
-.Fa count
-is set to 25.
-.Ss Algorithm:
-.Pp
-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 DES key is used to encrypt a 64-bit constant, using
-.Ar count
-iterations of
-.Tn DES .
-The value returned is a
-.Dv null Ns -terminated
-string, 20 or 13 bytes (plus null) in length, consisting of the
-.Ar salt ,
-followed by the encoded 64-bit encryption.
-.Pp
-The functions,
-.Fn encrypt
-and
-.Fn setkey
-provide access to the
-.Tn DES
-algorithm itself.
-.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 edflag
-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 function
-.Fn crypt
-returns a pointer to the encrypted value on success, and NULL on failure.
-.Pp
-The
-.Fn crypt
-and
-.Fn setkey
-functions all manipulate the same key space.
-.Sh SEE ALSO
-.Xr login 1 ,
-.Xr passwd 1 ,
-.Xr getpass 3 ,
-.Xr compat 5 ,
-.Xr passwd 5
-.Sh LEGACY SYNOPSIS
-.Fd #include <unistd.h>
-.Pp
-.Ft int
-.br
-.Fo encrypt
-.Fa "char *block"
-.Fa "int edflag"
-.Fc ;
-.Pp
-The function
-.Fn encrypt
-returns 0 on success and 1 on failure.
-.Pp
-.Ft void
-.br
-.Fo setkey
-.Fa "const char *key"
-.Fc ;
-.Pp
-The include file
-.In unistd.h
-is necessary and sufficient for the
-.Fn setkey
-function.
-.Sh BUGS
-The
-.Fn crypt
-function returns a pointer to static data, and subsequent calls to
-.Fn crypt
-will modify the same object.
-.Sh HISTORY
-A rotor-based
-.Fn crypt
-function appeared in
-.At v6 .
-The current style
-.Fn crypt
-first appeared in
-.At v7 .
-.Pp
-This library (FreeSec 1.0) was developed outside the United States of America
-as an unencumbered replacement for the U.S.-only libcrypt encryption
-library.
-Programs linked against the 
-.Fn crypt
-interface may be exported from the U.S.A. only if they use 
-.Fn crypt
-solely for authentication purposes and avoid use of
-the other programmer interfaces listed above. Special care has been taken
-in the library so that programs which only use the 
-.Fn crypt
-interface do not pull in the other components.
-.Sh AUTHOR
-David Burren <davidb@werj.com.au>