CRYPTO_memcmp - Constant time memory comparison
int CRYPTO_memcmp(const void *a, const void *b, size_t len);
The CRYPTO_memcmp function compares the len bytes pointed to by a
and b for equality. It takes an amount of time dependent on len,
but independent of the contents of the memory regions pointed to by a
CRYPTO_memcmp() returns 0 if the memory regions are equal and non-zero
Unlike memcmp(2), this function cannot be used to order the two memory
regions as the return value when they differ is undefined, other than being
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