OPENSSL_load_u32_be
pos = OPENSSL_load_u32_be(&magic, buf);
pos = OPENSSL_load_u32_be(&magic, pos);
pos = OPENSSL_load_u32_be(&magic, buf);
pos = OPENSSL_load_u32_be(&magic, pos);
restin = OPENSSL_load_u32_be(&u32, in);