save keys

README

@@ -6,6 +6,17 @@ to try it out:
     apt-get install arduino arduino-mk
 - get the required libraries from https://gitlab.net.020wireless.nl/yids/arduino-build
 
+- in base-tx there is test.c, it is a test for the messages
+
+possible ways to get the message to the pager:
+- udp packets to open wifi ap
+- multicast on lorawan
+- own transmitter
+- iridium paging system
+- udp packets via sattelite with a not encrypted dvb-ip downlink
+
+
+
 some things on ECC:
 
 http://www.infosecwriters.com/Papers/Anoopms_ECC.pdf

base-tx/packets.h

@@ -10,21 +10,15 @@ struct keypair
     uint8_t compressed_point[33];
 };
 
-
-struct pagermessage 
-{
   //Will be filled in with the compressed public key. Must be at least
   //                   (curve size + 1) bytes long; for example, if the curve is secp256r1,
   //                   compressed must be 33 bytes long.
+
+struct pagermessage 
+{
   uint8_t sender_compressed_point[33];
-  // address is SHA1 hash of publickey
-  //int address; 
-  // maybe use 7bit ascii, or even smaller characters (only letters +  numbers)
   char msg[128];
-    //unsigned char key[32];
-    unsigned char iv[16];
-
-
+  unsigned char iv[16];
 };
 
 /* subjectPublicKeyInfo field

base-tx/test.c

@@ -97,7 +97,15 @@ struct  pagermessage * send_message(struct keypair  *to, struct keypair *from, c
 */
 
 //  dump_buffer(sizeof(struct pagermessage), msg);
-  return msg;
+    char to_base64[sizeof(struct keypair)];
+    base64_encode(&to_base64, to, sizeof(struct keypair));
+    printf(" \nto (keypair):  len: %u base64: \n %129.129s \n", sizeof(struct keypair) ,to_base64, to);
+ 
+
+    char msg_base64[sizeof(struct pagermessage)];
+    base64_encode(&msg_base64, msg, sizeof(struct pagermessage));
+    printf(" \n encmsg: len: %u base64: \n %177.177s \n", sizeof(struct pagermessage) ,msg_base64, msg);
+    return msg;
 }
 void receive_message(struct keypair *me, struct pagermessage *msg)
 {
@@ -155,6 +163,21 @@ struct keypair * create_keypair() {
   return keypair;
 }
 
+save_key(struct keypair *key, char * filename) {
+  FILE  *f;
+  f = fopen(filename, "w");
+  fwrite(key, 1, sizeof(struct keypair), f);
+  fclose(f);
+}
+
+load_key(struct keypair *key, char * filename) {
+  FILE  *f;
+  f = fopen(filename, "r");
+  fread(key, 1, sizeof(struct keypair), f);
+  fclose(f);
+}
+
+
 void pb(char buf) {
 
 }
@@ -185,7 +208,9 @@ int main() {
     struct pagermessage * sended_msg;
     /* create keypairs */
     sender = create_keypair();
+    save_key(sender,"sender.keypair");
     receiver = create_keypair();
+    save_key(receiver,"receiver.keypair");
 
     sended_msg = send_message(receiver, sender, clear_message);