'\" t
.\" Copyright 1993, David Metcalfe <david@prism.demon.co.uk>
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH memfrob 3 2026-08-05 "Linux man-pages 6.19"
.SH NAME
memfrob \- memory frobnicate (obfuscate)
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" "             /* See feature_test_macros(7) */"
.BR #include\~<string.h> "  // see memory.h(3head)"
.P
.BR "void *memfrob(" "size_t n;"
.BI "              void " s [ n "], size_t " n );
.fi
.SH DESCRIPTION
The
.BR memfrob ()
function obfuscates the first
.I n
bytes of the memory area
.I s
by exclusive-ORing each character with the number
42.
The effect can be reversed by using
.BR memfrob ()
on the
obfuscated memory area.
.P
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 obfuscated memory
area.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.na
.nh
.BR memfrob ()
T}	Thread safety	MT-Safe
.TE
.SH STANDARDS
GNU.
.SH SEE ALSO
.BR memory.h (3head),
.BR strfry (3)