fake_rand_set_callback
fake_rand_set_callback(RAND_get0_private(NULL), &fbytes);
fake_rand_set_callback(RAND_get0_private(NULL), &fbytes);
fake_rand_set_callback(ctx, NULL);
void fake_rand_set_callback(EVP_RAND_CTX *ctx,
fake_rand_set_callback(RAND_get0_private(libctx), cb);
fake_rand_set_callback(RAND_get0_public(libctx), cb);