bitcore/docs/guide/ecies.md

title: ECIES description: Uses ECIES symmetric key negotiation from public keys to encrypt arbitrarily long data streams.

ECIES

Description

Bitcore implements Elliptic Curve Integrated Encryption Scheme (ECIES), which is a public key encryption system that performs bulk encryption on data using a symmetric cipher and a random key.

For more information refer to the bitcore-ecies github repo.

Installation

ECIES is implemented as a separate module and you must add it to your dependencies:

For node projects:

npm install bitcore-ecies --save

For client-side projects:

bower install bitcore-ecies --save

Example

var bitcore = require('bitcore');
var ECIES = require('bitcore-ecies');

var alicePrivateKey = new bitcore.PrivateKey();
var bobPrivateKey = new bitcore.PrivateKey();

var data = new Buffer('The is a raw data example');

// Encrypt data
var cypher1 = ECIES.privateKey(alicePrivateKey).publicKey(bobPrivateKey.publicKey);
var encrypted = cypher.encrypt(data);

// Decrypt data
var cypher2 = ECIES.privateKey(bobPrivateKey).publicKey(alicePrivateKey.publicKey);
var decrypted = cypher.decrypt(encrypted);

assert(data.toString(), decrypted.toString());