EVP_RAND_get_strength
if (EVP_RAND_get_strength(rng) < ossl_ifc_ffc_compute_security_bits(nbits)) {
unsigned int EVP_RAND_get_strength(EVP_RAND_CTX *ctx);
strength = EVP_RAND_get_strength(drbg);
strength = EVP_RAND_get_strength(expected->ctx);