mbed-os-examples / Mbed OS mbed-os-example-tls-hashing

Hello world example of using the hashing functions of mbed TLS. The canonical source for this example lives at https://github.com/ARMmbed/mbed-os-example-tls

SHA-256 Hash example on mbed OS

This application performs hashing of a buffer with SHA-256 using various APIs. It serves as a tutorial for the basic hashing APIs of mbed TLS.

Getting started

Building with mbed CLI

If you'd like to use mbed CLI to build this, then you should set up your environment if you have not done so already. For instructions, refer to the main readme. The instructions on this page relate to using the developer.mbed.org Online Compiler

Import the program in to the Online Compiler, select your board from the drop down in the top right hand corner and then compile the application. Once it has built, you can drag and drop the binary onto your device.

Monitoring the application

The output in the terminal window should be similar to this:

terminal output

Method 1: 315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3
Method 2: 315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3
Method 3: 315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3
Method 4: 315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3

DONE

Diff: main.cpp

Revision:
75:cc01992ff516
Parent:
72:6973f9247848
--- a/main.cpp	Tue Oct 23 09:45:14 2018 +0100
+++ b/main.cpp	Wed Oct 31 16:00:13 2018 +0000
@@ -47,13 +47,8 @@
 static const unsigned char *hello_buffer = (const unsigned char *) hello_str;
 static const size_t hello_len = strlen(hello_str);
 
-static int example(mbedtls_platform_context* ctx)
+static int example()
 {
-    // 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("\n\n");
 
     /*
@@ -157,20 +152,19 @@
 }
 
 int main() {
-    mbedtls_platform_context platform_ctx;
     int exit_code = MBEDTLS_EXIT_FAILURE;
 
-    if((exit_code = mbedtls_platform_setup(&platform_ctx)) != 0) {
+    if((exit_code = mbedtls_platform_setup(NULL)) != 0) {
         printf("Platform initialization failed with error %d\n", exit_code);
         return MBEDTLS_EXIT_FAILURE;
     }
 
-    exit_code = example(&platform_ctx);
+    exit_code = example();
     if (exit_code != 0) {
         mbedtls_printf("Example failed with error %d\n", exit_code);
         exit_code = MBEDTLS_EXIT_FAILURE;
     }
 
-    mbedtls_platform_teardown(&platform_ctx);
+    mbedtls_platform_teardown(NULL);
     return exit_code;
 }