memfrob — frobnicate (encrypt) a memory area


#define _GNU_SOURCE             /* See feature_test_macros(7) */
#include <string.h>

void *memfrob(void *s, size_t n);


The memfrob() function encrypts the first n bytes of the memory area s by exclusive-ORing each character with the number 42. The effect can be reversed by using memfrob() on the encrypted memory area.

Note that this function is not a proper encryption routine as the XOR constant is fixed, and is suitable only for hiding strings.

Return Value

The memfrob() function returns a pointer to the encrypted memory area.


For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
memfrob() Thread safety MT-Safe

Conforming to

The memfrob() function is unique to the GNU C Library.

See Also

bstring(3), strfry(3)


This page is part of release 5.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at

Referenced By

bstring(3), strfry(3).

2017-03-13 GNU Linux Programmer's Manual