ssh token: Move SSH code to a separate utils file

tokens/ssh/ssh-utils.h

@@ -0,0 +1,29 @@
+/*
+ * ssh plugin utilities
+ *
+ * Copyright (C) 2016-2021 Milan Broz <gmazyland@gmail.com>
+ * Copyright (C) 2020-2021 Vojtech Trefny
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <libssh/libssh.h>
+#include <libssh/sftp.h>
+#include <libcryptsetup.h>
+
+int sshplugin_download_password(struct crypt_device *cd, ssh_session ssh,
+	const char *path, char **password, size_t *password_len);
+ssh_session sshplugin_session_init(struct crypt_device *cd, const char *host, const char *user);
+int sshplugin_public_key_auth(struct crypt_device *cd, ssh_session ssh, const ssh_key pkey);