Arduino DUE AES Encryption library, how to adopt libtomcrypt?

Using Arduino Programming Questions
1

Hi,
Im looking for encryption library that can work with Arduino Due, there are few libs, but every of it working only on AVR's. I found very interesting and advanced library, TomCrypt libtom GitHub - libtom/libtomcrypt: LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines. But unfortunatly it needs few changes to adopt to work as a Arduino library. I dont have any experiences with that and im looking for some who can help me with it, or generally adopt this libs to Arduino to help our community
Regards

2

If you want to integrate it into the libraries folder then the following steps worked for me:

  • Unpack the zip file in the Arduino libraries folder.
  • Go into the top level folder of the unpacked library and create a library.properties with something like this (you can put more sensible values in if you want):
name=TomCrypt
version=1.0.0
author=Tom
maintainer=xxx
sentence=xxx
paragraph=xxx
category=Device Control
url=xxx
architectures=*
include=tomcrypt.h

More details on the properties file here.

  • Now a dirty hack: copy all the headers files from the src/header folder into the src/ folder. The Arduino build environment expects public headers to be there.
  • Now another dirty hack, but only because I don't know why it is necessary and it may not be the best place for it: Edit src/tomcrypt_custom.h, after the include guard, add a new line #define LTC_SOURCE
    I don't know what LTC_SOURCE means, but it is not defined anywhere and without it a few bits and bobs aren't available.
  • Restart your Arduino IDE and include the library in a small test sketch to compile everything. This is what I used, but I have no idea how to use the library - it was just a quick and dirty test:
#include <tomcrypt.h>

symmetric_key mskey;
  
void setup() {
  if (rijndael_setup((const unsigned char *)"my key", 6, 6, &mskey)) { }
}

void loop() { }

If it now compiles - well done. I haven't tested anything more since I don't have a Due and don't really want to figure out how to use the library properly anyway.