ethereum-encryption/src/bitcore-ecies/aescbc.js

Use this to encrypt, decrypt, sign and verify data with an ethereum public- or privateKey

/**
 * copied from bitcore-ecies
 * https://github.com/bitpay/bitcore-ecies
 */

import {
    util as bitcoreUtil,
    crypto as bitcoreCrypto
} from 'bitcore-lib';

const $ = bitcoreUtil.preconditions;
const Random = bitcoreCrypto.Random;
const Hash = bitcoreCrypto.Hash;

import * as AES from './aes';
import CBC from './cbc';

// Symmetric encryption with AES and CBC convenience class
const AESCBC = function AESCBC() {};

export function encrypt(messagebuf, passwordstr) {
    $.checkArgument(messagebuf);
    $.checkArgument(passwordstr);
    const cipherkeybuf = Hash.sha256(new Buffer(passwordstr));
    return AESCBC.encryptCipherkey(messagebuf, cipherkeybuf);
};

export function decrypt(encbuf, passwordstr) {
    $.checkArgument(encbuf);
    $.checkArgument(passwordstr);
    const cipherkeybuf = Hash.sha256(new Buffer(passwordstr));
    return AESCBC.decryptCipherkey(encbuf, cipherkeybuf);
};

export function encryptCipherkey(messagebuf, cipherkeybuf, ivbuf) {
    $.checkArgument(messagebuf);
    $.checkArgument(cipherkeybuf);
    $.checkArgument(ivbuf);
    ivbuf = ivbuf || Random.getRandomBuffer(128 / 8);
    const ctbuf = CBC.encrypt(messagebuf, ivbuf, AES, cipherkeybuf);
    const encbuf = Buffer.concat([ivbuf, ctbuf]);
    return encbuf;
};

export function decryptCipherkey(encbuf, cipherkeybuf) {
    $.checkArgument(encbuf);
    $.checkArgument(cipherkeybuf);
    const ivbuf = encbuf.slice(0, 128 / 8);
    const ctbuf = encbuf.slice(128 / 8);
    const messagebuf = CBC.decrypt(ctbuf, ivbuf, AES, cipherkeybuf);
    return messagebuf;
};