OSSL_CMP_CTX_server_perform
resp = OSSL_CMP_CTX_server_perform(cmp_ctx /* of client */, req);
res = OSSL_CMP_CTX_server_perform(ctx, actual_req);
OSSL_CMP_MSG *rsp = OSSL_CMP_CTX_server_perform(ctx, req);
OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx,
if (!TEST_ptr(rsp = OSSL_CMP_CTX_server_perform(client_ctx, fixture->req))