.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" 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.\" manual page may be incorrect or out-of-date.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
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.\" 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 García <gerardo.aburruzagaca.es>
.\"
.TH MEMFROB 3  "12 abril 1993" "GNU" "Manual del Programador de Linux"
.SH NOMBRE
.\" frobnicate ? -> frobnicar ???
memfrob \- cifra un área de memoria
.SH SINOPSIS
.nf
.B #include <string.h>
.sp
.BI "void *memfrob(void *" s ", size_t " n );
.fi
.SH DESCRIPCIÓN
La función \fBmemfrob()\fP cifra los primeros \fIn\fP bytes de la
zona de memoria \fIs\fP haciendo un XOR (O exclusivo) de cada carácter
con el número
42.  El efecto puede invertirse empleando de nuevo \fBmemfrob()\fP en la
zona de memoria cifrada.
.PP
Observe que esta función no es una rutina correcta de cifrado puesto
que la constante para el XOR está fijada de antemano, y por tanto esta
función sólo es válida para ocultar cadenas de caracteres
temporalmente. 
.SH "VALOR DEVUELTO"
La función \fBmemfrob()\fP devuelve un puntero al área de memoria cifrada.
.SH "CONFORME A"
La función \fBmemfrob()\fP es única a la Biblioteca de C de Linux y a
la de GNU.
.SH "VÉASE TAMBIÉN"
.BR strfry (3)