diff --git a/include/chat/crypto.h b/include/chat/crypto.h
index 86ad7ec..4ee5cdd 100644
--- a/include/chat/crypto.h
+++ b/include/chat/crypto.h
@@ -35,8 +35,6 @@ extern "C" {
 #define WHY2_CHAT_PRI_KEY "pri"
 #define WHY2_CHAT_KEY_BASE 62 //BASE IN THE GENERATED KEYS ARE STORED IN WHY2_CHAT_KEY_LOCATION
 
-#define WHY2_CHECKSUM_SEGMENT_SIZE 4
-
 void why2_chat_init_keys(void); //INIT (POSSIBLY GENERATE) RSA KEYS
 void why2_chat_deallocate_keys(void); //DEALLOCATE :) (NO SLUR HERE)
 
@@ -48,8 +46,6 @@ char *why2_chat_rsa_pri_decrypt(char *to_decrypt); //RSA DECRYPT USING PRIVATE K
 
 char *why2_sha256(char *input); //HASH input USING SHA256 AND RETURN IN STRING
 
-unsigned long why2_checksum_segment(char *input); //TOO LONG TO EXPLAIN, DEAL WITH IT. TREAT IT LIKE A NORMAL CHECKSUM
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/crypto.h b/include/crypto.h
new file mode 100644
index 0000000..2dee4dc
--- /dev/null
+++ b/include/crypto.h
@@ -0,0 +1,36 @@
+/*
+This is part of WHY2
+Copyright (C) 2022 Václav Šmejkal
+
+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 3 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, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef WHY2_CRYPTO_H
+#define WHY2_CRYPTO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//MACROS
+#define WHY2_CHECKSUM_SEGMENT_SIZE 4 //SEGMENT SIZE FOR CALCULATING CHECKSUM
+
+//FUNCTIONS
+unsigned long why2_checksum_segment(char *input); //TOO LONG TO EXPLAIN, DEAL WITH IT. TREAT IT LIKE A NORMAL CHECKSUM
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file