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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sat Jul 24 18:54:45 1993 by Rik Faith (faith@cs.unc.edu)
.\" Translated into Spanish Wed Mar 4 10:55:46 CET 1998 by Gerardo
.\" Aburruzaga Garca <gerardo.aburruzagaca.es>
.\"
.TH MEMFROB 3 "4 Marzo 1998" "GNU" "Manual del Programador de Linux"
.SH NOMBRE
.\" frobnicate ? -> frobnicar ???
memfrob \- cifra un rea de memoria
.SH SINOPSIS
.nf
.B #include <string.h>
.sp
.BI "void *memfrob(void *" s ", size_t " n );
.fi
.SH DESCRIPCIN
La funcin \fBmemfrob()\fP cifra los primeros \fIn\fP bytes de la
zona de memoria \fIs\fP haciendo un XOR (O exclusivo) de cada carcter
con el nmero
42. El efecto puede invertirse empleando de nuevo \fBmemfrob()\fP en la
zona de memoria cifrada.
.PP
Observe que esta funcin no es una rutina correcta de cifrado puesto
que la constante para el XOR est fijada de antemano, y por tanto esta
funcin slo es vlida para ocultar cadenas de caracteres
temporalmente.
.SH "VALOR DEVUELTO"
La funcin \fBmemfrob()\fP devuelve un puntero al rea de memoria cifrada.
.SH "CONFORME A"
La funcin \fBmemfrob()\fP es nica a la Biblioteca de C de Linux y a
la de GNU.
.SH "VASE TAMBIN"
.BR strfry (3)
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