1 files changed, 90 insertions, 0 deletions
diff --git a/lib/libcrypt/descrypt.3 b/lib/libcrypt/descrypt.3
new file mode 100644
index 0000000..c028b19
--- /dev/null
+++ b/lib/libcrypt/descrypt.3
@@ -0,0 +1,90 @@
+.\" 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 January 19, 1997
+.Dt DES 3
+.Os "FreeSec 1.0"
+.Sh NAME
+.Nm des
+.Nd Trapdoor encryption
+.Sh DESCRIPTION
+.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.
+.Sh SEE ALSO
+.Xr crypt 3
+.Sh AVAILABILITY
+.Pp
+DES Crypt is only available if it has been added.  It is not available
+by default.
+.Sh HISTORY
+A rotor-based
+.Fn crypt
+function appeared in
+.At v6 .
+The current style
+.Fn crypt
+first appeared in
+.At v7 .
+.Pp
+The DES section of the code (FreeSec 1.0) was developed outside the United
+States of America as an unencumbered replacement for the U.S.-only NetBSD
+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
+David Burren <davidb@werj.com.au>