Add secret file to print out

This is useful for testing decryption with large files

Author: will-v-pi

encrypted/hello_encrypted/CMakeLists.txt

@@ -1,8 +1,15 @@
 # Example encrypted binard
 add_executable(hello_encrypted
         hello_encrypted.c
+        secret.S
         )
 
+# include secret.txt
+target_include_directories(hello_encrypted PRIVATE ${CMAKE_CURRENT_LIST_DIR})
+
+# add dependency on secret.txt
+set_property(SOURCE secret.S APPEND PROPERTY OBJECT_DEPENDS ${CMAKE_CURRENT_LIST_DIR}/secret.txt)
+
 # pull in common dependencies
 target_link_libraries(hello_encrypted pico_stdlib)
 

encrypted/hello_encrypted/hello_encrypted.c

@@ -20,11 +20,14 @@ int main() {
     rom_explicit_buy(buffer, 4096);
     free(buffer);
 #endif
+    extern char secret_data[];
 
     while (true) {
         printf("Hello, world!\n");
         printf("I'm a self-decrypting binary\n");
         printf("My secret is...\n");
         sleep_ms(1000);
+        printf(secret_data);
+        sleep_ms(10000);
     }
 }

encrypted/hello_encrypted/secret.S

@@ -0,0 +1,5 @@
+.section .rodata
+.global secret_data
+secret_data:
+.incbin "secret.txt"
+.byte 0

encrypted/hello_encrypted/secret.txt

@@ -0,0 +1 @@
+TODO: Put a funny secret here