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diff --git a/src/remmina_utils.h b/src/remmina_utils.h
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+/*
+ * Remmina - The GTK+ Remote Desktop Client
+ * Copyright (C) 2016-2023 Antenore Gatta, Giovanni Panozzo
+ * Copyright (C) 2023-2024 Hiroyuki Tanaka, Sunil Bhat
+ *
+ * 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.
+ *
+ *  In addition, as a special exception, the copyright holders give
+ *  permission to link the code of portions of this program with the
+ *  OpenSSL library under certain conditions as described in each
+ *  individual source file, and distribute linked combinations
+ *  including the two.
+ *  You must obey the GNU General Public License in all respects
+ *  for all of the code used other than OpenSSL. *  If you modify
+ *  file(s) with this exception, you may extend this exception to your
+ *  version of the file(s), but you are not obligated to do so. *  If you
+ *  do not wish to do so, delete this exception statement from your
+ *  version. *  If you delete this exception statement from all source
+ *  files in the program, then also delete it here.
+ *
+ */
+
+/**
+ *  @file: remmina_utils.h
+ *  General utility functions, non-GTK related.
+ */
+
+#pragma once
+
+#include <glib.h>
+#include <gio/gio.h>
+#include <openssl/rsa.h>
+#include <openssl/evp.h>
+#include <openssl/decoder.h>
+
+#define MAX_COMPRESSED_FILE_SIZE 100000 //100kb file size max
+#define NAME_OF_DIGEST "SHA256"
+#define RSA_KEYTYPE "RSA"
+
+extern const char *remmina_RSA_PubKey_v1;
+extern const char *remmina_RSA_PubKey_v2;
+extern const char *remmina_EC_PubKey;
+G_BEGIN_DECLS
+gint remmina_utils_string_find(GString *haystack, gint start, gint end, const gchar *needle);
+gint remmina_utils_string_replace(GString *str, gint pos, gint len, const gchar *replace);
+
+guint remmina_utils_string_replace_all(GString *haystack, const gchar *needle, const gchar *replace);
+gchar *remmina_utils_string_strip(const gchar *s);
+
+gchar *remmina_utils_get_lang();
+gchar *remmina_utils_get_kernel_name();
+gchar *remmina_utils_get_kernel_release();
+gchar *remmina_utils_get_kernel_arch();
+gchar *remmina_utils_get_lsb_id();
+gchar *remmina_utils_get_lsb_description();
+gchar *remmina_utils_get_lsb_release();
+gchar *remmina_utils_get_lsb_codename();
+GHashTable *remmina_utils_get_etc_release();
+gchar *remmina_utils_get_dev();
+gchar *remmina_utils_get_logical();
+gchar *remmina_utils_get_link();
+gchar *remmina_utils_get_python();
+gchar *remmina_utils_get_mage();
+gchar *remmina_sha256_buffer(const guchar *buffer, gssize length);
+gchar *remmina_sha1_file(const gchar *filename);
+gchar *remmina_gen_random_uuid();
+EVP_PKEY *remmina_get_pubkey(const char *keytype, const char *public_key_selection);
+gchar *remmina_rsa_encrypt_string(EVP_PKEY *pubkey, const char *instr);
+int remmina_decompress_from_memory_to_file(guchar *source, int len, GFile* plugin_file);
+int remmina_compress_from_file_to_file(GFile *source, GFile *dest);
+gboolean remmina_verify_plugin_signature(const guchar *signature, GFile* plugin_file, size_t message_length, size_t signature_length);
+gboolean remmina_execute_plugin_signature_verification(GFile* plugin_file, size_t msg_len, const guchar *sig, size_t sig_len, EVP_PKEY* public_key);
+G_END_DECLS