memfrob - frobnicate (encrypt) a memory area
#define _GNU_SOURCE /* See feature_test_macros(7) */
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.
The memfrob() function returns a pointer to the encrypted memory area.
For an explanation of the terms used in this section, see attributes(7).
The memfrob() function is unique to the GNU C Library.
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