1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" Permission is granted to make and distribute verbatim copies of this
4 .\" manual provided the copyright notice and this permission notice are
5 .\" preserved on all copies.
7 .\" Permission is granted to copy and distribute modified versions of this
8 .\" manual under the conditions for verbatim copying, provided that the
9 .\" entire resulting derived work is distributed under the terms of a
10 .\" permission notice identical to this one.
12 .\" Since the Linux kernel and libraries are constantly changing, this
13 .\" manual page may be incorrect or out-of-date. The author(s) assume no
14 .\" responsibility for errors or omissions, or for damages resulting from
15 .\" the use of the information contained herein. The author(s) may not
16 .\" have taken the same level of care in the production of this manual,
17 .\" which is licensed free of charge, as they might when working
20 .\" Formatted or processed versions of this manual, if unaccompanied by
21 .\" the source, must acknowledge the copyright and authors of this work.
23 .\" References consulted:
24 .\" Linux libc source code
25 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
27 .\" Modified Sat Jul 24 18:54:45 1993 by Rik Faith (faith@cs.unc.edu)
28 .TH MEMFROB 3 2007-07-26 "GNU" "Linux Programmer's Manual"
30 memfrob \- frobnicate (encrypt) a memory area
33 .B #define _GNU_SOURCE
34 .B #include <string.h>
36 .BI "void *memfrob(void *" s ", size_t " n );
41 function encrypts the first \fIn\fP bytes of the
42 memory area \fIs\fP by exclusive-ORing each character with the number
44 The effect can be reversed by using
47 encrypted memory area.
49 Note that this function is not a proper encryption routine as the XOR
50 constant is fixed, and is only suitable for hiding strings.
54 function returns a pointer to the encrypted memory
59 function is unique to the