This is a simple application for asymmetric encryption.
Bolang wants to send a message to Batman. He wants to say "Criminals are in action on Rabbit Road"
- They must have private key and public key
$ rsaboy.jar '{"command": "generate_key", "filename": "Bolang"}'
Above command will generate Bolang.priv.pem and Bolang.pub.pem in Bolang's device.
$ rsaboy.jar '{"command": "generate_key", "filename": "Batman"}'
Above command will generate Batman.priv.pem and Batman.pub.pem in Batman's device.
In this step they have to share their public key
Bolang send his public key Bolang.pub.pem to Batman
Batman send his public key Batman.pub.pem to Bolang
Encrypt the message using Batman's public key
$ rsaboy.jar '{"command": "encrypt", "message": "Criminals are in action on Rabbit Road", "pubkey_file": "Batman.pub.pem"}'
SKl21Quj/bGR1HMRNrc/qiNAFXIU8RAhBfJdQNmSwgHLKw1KFVfu78+jcQ8UAsXtG6hd8ih9y+Kpdu8aDSxGIh4MNaTBlibfuODdvjhRvBJEr+iX6rzN+2q3+2bwD/gyckePhdGyXNGEmQXTUCf9RWrsVur4gRNdzl5xiE/jQxDhrBo5IN8okTLYJ/5AQNQh2Ic7Rm91M4N70wOM/M0FWzrwFmBTFuQ3pC2+ZeMJfHR5KQ3EP1dNo4xA8GDjgSkE6fmkyWhbQspT3cLUKCHFfna9N+m8x0icbZ7MYFnzTREWrgewpNjuTFH9hmxnLQ7DWulyOlgR48V0RPQBCVr8Dg==
Sign the message
$ rsaboy.jar '{"command": "sign", "message": "Criminals are in action on Rabbit Road", "privkey_file": "Bolang.priv.pem"}'
btT3N2EFuokJUqXfW0IN9MrGe0pi/FuvQ3sFE987/B2OKHuzZnrLl0YVfRp1i3O4Nnrhf9AfCI9ELxQQ2OENDIPQa2iA8/hKEh23IwzZyYBCQGRHc6Gzreoo5OA3IvsXABtJLXJKaNJuKvwpIl0/lTMyqbxZt7Etbfh+LsOovXzSRlDwwvOWLPk5XF8b9UFJm9IWar/EsXhO4Ee6Me49nGc7CDApwzOvv1mufn36MyrdrmQGW6W9YYme58ZBWzYu9/UmH97JLcyXS/X6uYk/iXqWUC81uBO/QA0VpaaUkVXmwvKYLSHhzrEF5ubUrYsxGT/QSkbLK2IwPBD4kDYJUg==
Than he send the encrypted message and the digatal signature to Batman
Decrypt the message using His private key.
$ rsaboy.jar '{"command": "decrypt", "message": "SKl21Quj/bGR1HMRNrc/qiNAFXIU8RAhBfJdQNmSwgHLKw1KFVfu78+jcQ8UAsXtG6hd8ih9y+Kpdu8aDSxGIh4MNaTBlibfuODdvjhRvBJEr+iX6rzN+2q3+2bwD/gyckePhdGyXNGEmQXTUCf9RWrsVur4gRNdzl5xiE/jQxDhrBo5IN8okTLYJ/5AQNQh2Ic7Rm91M4N70wOM/M0FWzrwFmBTFuQ3pC2+ZeMJfHR5KQ3EP1dNo4xA8GDjgSkE6fmkyWhbQspT3cLUKCHFfna9N+m8x0icbZ7MYFnzTREWrgewpNjuTFH9hmxnLQ7DWulyOlgR48V0RPQBCVr8Dg==", "privkey_file": "Batman.priv.pem"}'
Criminals are in action on Rabbit Road
Verifying the message is really came from Bolang. It uses Bolang's public key
$ rsaboy.jar '{"command": "verify", "message": "Criminals are in action on Rabbit Road", "signature":"btT3N2EFuokJUqXfW0IN9MrGe0pi/FuvQ3sFE987/B2OKHuzZnrLl0YVfRp1i3O4Nnrhf9AfCI9ELxQQ2OENDIPQa2iA8/hKEh23IwzZyYBCQGRHc6Gzreoo5OA3IvsXABtJLXJKaNJuKvwpIl0/lTMyqbxZt7Etbfh+LsOovXzSRlDwwvOWLPk5XF8b9UFJm9IWar/EsXhO4Ee6Me49nGc7CDApwzOvv1mufn36MyrdrmQGW6W9YYme58ZBWzYu9/UmH97JLcyXS/X6uYk/iXqWUC81uBO/QA0VpaaUkVXmwvKYLSHhzrEF5ubUrYsxGT/QSkbLK2IwPBD4kDYJUg==", "pubkey_file": "Bolang.pub.pem"}'
true
He can reply to Bolang's message. All He has to do is encrypt the message and give a digital sign like step number 3.
Steps 3 and 4 will be repeated continuously if Bolang and Batman continue the conversation.