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CRYPTO_memcmp - Constant time memory comparison
#include <openssl/crypto.h> 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 and b.
CRYPTO_memcmp() returns 0 if the memory regions are equal and non-zero otherwise.
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 non-zero.
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