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            goto err;
        }
        if(!(key = PEM_read_bio_PrivateKey(b, NULL, 0, pwd))) {
            scep_log(config->handle, ERROR, "Reading private key failed");
            goto err;
        }
        BIO_free(b);
    }
    else {
        //we got an engine
        if(!(key = ENGINE_load_private_key(config->handle->configuration->engine, key_str, NULL, NULL))) {
            scep_log(config->handle, ERROR, "Loading private key from engine failed");
            create_err_msg(config, NULL);
        }
    }
    return key;
    err:
        BIO_free(b);
        EVP_PKEY_free(key);
        create_err_msg(config, NULL);
    return NULL;