Fix aes spitting garbage on Linux

Separate Makefiles for GNU make on Linux and BSD make on FreeBSD

Improve Makefile

Make RSA work with OpenSSL 1.1.1l as well

Remove a test file

Merge branch 'aes' into openssl-3.0

Add a bunch of CPP to get it compiling with OpenSSL 1.1.1

But not fully working yet

Preliminary Implementation of AES Encryption/Decryption

Initial notes on AES encryption and decryption

Update Makefile

Add lib64 to LDIR

As tested on OpenSSL 3.0.0-beta2

Finish porting to OpenSSL 3.0

Avoid OpenSSL 3.0 deprecations during RSA encrypt

Check key id for RSA key validation

Replace RSA specific structures with EVP_PKEY

Prepare for migration to OpenSSL 3.0

Add License

Fix hyperlink in README

Exit with proper exit code in case of encryption / decryption errors

Handle file open errors