LIBTOMCRYPT RSA DIGITAL SIGNATURES HOW-TO

This how-to describes how to implement RSA digital signatures using LibTomCrypt (and LibTomMath) on Windows and macOS.

GETTING STARTED

1. Get LibTomMath and LibTomCrypt

   git clone https://github.com/TaleTN/libtommath.git git clone https://github.com/TaleTN/libtomcrypt.git

2. Remove unused source files (optional)

   perl remove_unused.pl --force

3. Build LibTomMath and LibTomCrypt

   [n]make [-f makefile.msvc]

4. Generate public/private key pair

   [n]make [-f makefile.msvc] key

5. Run sign and verify examples

   [n]make [-f makefile.msvc] test

6. Have fun!

FILES IN THIS DISTRIBUTION

dertoh.cpp - Utility that converts DER to C/C++ header file format, so you can directly include the public key in a C/C++ source file. dertopem.sh - Bash script that uses OpenSSL to convert the public and private key pair from DER to PEM file format. error.h - Helper routines for rsa_make_key.cpp, rsa_sign.cpp, and rsa_verify.cpp. LICENSE - License, duh! makefile - GCC/Clang makefile. makefile.msvc - Microsoft C/C++ makefile. README - <-- You are here. remove_unused.pl - Perl script that removes all unused LibTomMath and LibTomCrypt files. rsa_make_key.cpp - Example that generates a public and private key pair. rsa_sign.cpp - Example that signs a message. rsa_verify.cpp - Example that verifies a signature.

LICENSE

Copyright (C) 2015-2021 Theo Niessink theo@taletn.com This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the LICENSE file for more details.