memfrob - frobnicate (encrypt) a memory area
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.
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