ssh UPDATE add new private key identities

Added support for new privkey identities - PKCS8 and OpenSSH, which are
missing in the ietf-netconf-server model. Renamed config_new to
config_new_ssh.
diff --git a/src/config_new_ssh.h b/src/config_new_ssh.h
new file mode 100644
index 0000000..780a9c7
--- /dev/null
+++ b/src/config_new_ssh.h
@@ -0,0 +1,89 @@
+/**
+ * @file config_new_ssh.h
+ * @author Roman Janota <janota@cesnet.cz>
+ * @brief libnetconf2 server new configuration creation
+ *
+ * @copyright
+ * Copyright (c) 2023 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#ifndef NC_CONFIG_NEW_SSH_H_
+#define NC_CONFIG_NEW_SSH_H_
+
+#include <libyang/libyang.h>
+
+#include "session_p.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* private key's pkcs8 header */
+#define NC_PKCS8_PRIVKEY_HEADER "-----BEGIN PRIVATE KEY-----\n"
+
+/* private key's pkcs8 footer */
+#define NC_PKCS8_PRIVKEY_FOOTER "\n-----END PRIVATE KEY-----\n"
+
+/* private key's openssh header */
+#define NC_OPENSSH_PRIVKEY_HEADER "-----BEGIN OPENSSH PRIVATE KEY-----\n"
+
+/* private key's openssh footer */
+#define NC_OPENSSH_PRIVKEY_FOOTER "\n-----END OPENSSH PRIVATE KEY-----\n"
+
+/* private key's pkcs1 rsa header */
+#define NC_PKCS1_RSA_PRIVKEY_HEADER "-----BEGIN RSA PRIVATE KEY-----\n"
+
+/* private key's sec1 ec header */
+#define NC_SEC1_EC_PRIVKEY_HEADER "-----BEGIN EC PRIVATE KEY-----\n"
+
+/* private key's header when getting an EC/RSA privkey from file using libssh */
+#define NC_LIBSSH_PRIVKEY_HEADER "-----BEGIN PRIVATE KEY-----\n"
+
+/* private key's footer when getting an EC/RSA privkey from file using libssh */
+#define NC_LIBSSH_PRIVKEY_FOOTER "\n-----END PRIVATE KEY-----\n"
+
+/* public key's ssh2 header */
+#define NC_SSH2_PUBKEY_HEADER "---- BEGIN SSH2 PUBLIC KEY ----\n"
+
+/* public key's SubjectPublicKeyInfo format header */
+#define NC_SUBJECT_PUBKEY_INFO_HEADER "-----BEGIN PUBLIC KEY-----\n"
+
+/* public key's SubjectPublicKeyInfo format footer */
+#define NC_SUBJECT_PUBKEY_INFO_FOOTER "\n-----END PUBLIC KEY-----\n"
+
+typedef enum {
+    NC_ALG_HOSTKEY,
+    NC_ALG_KEY_EXCHANGE,
+    NC_ALG_ENCRYPTION,
+    NC_ALG_MAC
+} NC_ALG_TYPE;
+
+/**
+ * @brief Configures the listen subtree in the ietf-netconf-server module.
+ *
+ * @param[in] op Operation to be done on the subtree. Only does something if the operation is NC_OP_DELETE.
+ * @return 0 on success, 1 on error.
+ */
+int nc_server_config_listen(NC_OPERATION op);
+
+/**
+ * @brief Deletes everything stored in the keystore.
+ */
+void nc_server_config_del_keystore(void);
+
+/**
+ * @brief Deletes everything stored in the truststore.
+ */
+void nc_server_config_del_trustore(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NC_CONFIG_NEW_SSH_H_ */