antiSocial

antisocial-encryption module

Implement Hybrid Cryptosystem used for user to user encryption of messages using previously exchanged public keys

https://en.wikipedia.org/wiki/Hybrid_cryptosystem

npm install antisocial-encryption

Generate a key:

var cryptography = require('antisocial-encryption');

cryptography.getKeyPair(function (err, keypair) {
	if(err) {
		// ...something went wrong...
	}

	kp is an object with 2 properties
	{
		'public': 2048 bit rsa key,
		'private': 2048 bit rsa key
	}

	// now you can do something with the keypair
	// like save it in local data store and hand
	// the public key to the peer you want to exchange
	// encrypted messages with.
});

Encrypt a message

On the senders side encrypt the message using the recipient public key and the sender private key.

var cryptography = require('antisocial-encryption');
var data = JSON.stringify({ 'foo': 'bar' });
message = cryptography.encrypt(publicKeyOfRecipient, privateKeyOfSender, data);

The resulting message is an object containing the encrypted data, a signature and an encrypted password which can only be decrypted by the recipient. This message can now be securely transmitted to the intended recipient.

Decrypt the message

On the recipient side decrypt the message using the sender public key and the recipient private key.

var cryptography = require('antisocial-encryption');
var decrypted = cryptography.decrypt(publicKeyOfSender, privateKeyOfRecipient, message);

decrypted.valid is false then the error description is in decrypted.invalidReason

if decrypted.valid is true, the decrypted information is in decrypted.data.