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[linuxjm/LDP_man-pages.git] / original / man3 / memfrob.3

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-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" 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-.\" manual page may be incorrect or out-of-date.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.
-.\" %%%LICENSE_END
-.\"
-.\" 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)
-.TH MEMFROB 3  2014-03-17 "GNU" "Linux Programmer's Manual"
-.SH NAME
-memfrob \- frobnicate (encrypt) a memory area
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "             /* See feature_test_macros(7) */"
-.B #include <string.h>
-.sp
-.BI "void *memfrob(void *" s ", size_t " n );
-.fi
-.SH DESCRIPTION
-The
-.BR memfrob ()
-function encrypts the first \fIn\fP bytes of the
-memory area \fIs\fP by exclusive-ORing each character with the number
-42.
-The effect can be reversed by using
-.BR memfrob ()
-on the
-encrypted memory area.
-.PP
-Note that this function is not a proper encryption routine as the XOR
-constant is fixed, and is suitable only for hiding strings.
-.SH RETURN VALUE
-The
-.BR memfrob ()
-function returns a pointer to the encrypted memory
-area.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR memfrob ()
-function is thread-safe.
-.SH CONFORMING TO
-The
-.BR memfrob ()
-function is unique to the
-GNU C Library.
-.SH SEE ALSO
-.BR strfry (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.