EVP_PKEY_get1_DH
key = EVP_PKEY_get1_DH(pkey);
key = EVP_PKEY_get1_DH(pkey);
OSSL_DEPRECATEDIN_3_0 struct dh_st *EVP_PKEY_get1_DH(EVP_PKEY *pkey);
ret = EVP_PKEY_get1_DH(dhpkey);
dh = EVP_PKEY_get1_DH(dhpkey);