'\" t .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" .\" 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 2024-05-02 "Linux man-pages 6.9.1" .SH NAME memfrob \- frobnicate (obfuscate) a memory area .SH LIBRARY Standard C library .RI ( libc ", " \-lc ) .SH SYNOPSIS .nf .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" .B #include .P .BI "void *memfrob(void " s [. n "], size_t " n ); .fi .SH DESCRIPTION The .BR memfrob () function obfuscates 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 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 bstring (3), .BR strfry (3)