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 nonzero
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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