Add a link to the platform context passing issue

Author: Andrzej Kurek

authcrypt/main.cpp

@@ -30,6 +30,8 @@ int main() {
     }
 
     int exit_code = MBEDTLS_EXIT_SUCCESS;
+    // The platform context is passed just in case any crypto calls need it.
+    // Please refer to https://github.com/ARMmbed/mbedtls/issues/1200 for more information.
     Authcrypt *authcrypt = new Authcrypt(&platform_ctx);
 
     if (authcrypt->run() != 0) {

benchmark/main.cpp

@@ -311,6 +311,7 @@ static int benchmark( int argc, char *argv[], mbedtls_platform_context* ctx )
 #endif
     // The call below is used to avoid the "unused parameter" warning.
     // The context itself can be used by cryptographic calls which require it.
+    // Please refer to https://github.com/ARMmbed/mbedtls/issues/1200 for more information.
     (void)ctx;
     if( argc <= 1 )
     {

hashing/main.cpp

@@ -51,6 +51,7 @@ static int example(mbedtls_platform_context* ctx)
 {
     // The call below is used to avoid the "unused parameter" warning.
     // The context itself can be used by cryptographic calls which require it.
+    // Please refer to https://github.com/ARMmbed/mbedtls/issues/1200 for more information.
     (void)ctx;
 
     mbedtls_printf("\r\n\r\n");

tls-client/main.cpp

@@ -70,7 +70,11 @@ int main()
     printf("Using Mbed OS from master.\n");
 #endif /* MBEDTLS_MAJOR_VERSION */
 
-    /* Allocate a HTTPS client */
+    /* Allocate a HTTPS client
+     *
+     * The platform context is passed just in case any crypto calls need it.
+     * Please refer to https://github.com/ARMmbed/mbedtls/issues/1200 for more
+     * information. */
     client = new (std::nothrow) HelloHttpsClient(SERVER_NAME, SERVER_PORT,
                                                  &platform_ctx);
     if (client == NULL) {