Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | 1x 1x 1x 1x 1x | /**
* Copyright (c) Benjamin Ansbach - all rights reserved.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
'use strict';
const Sha = require('@pascalcoin-sbx/common').Sha;
const BC = require('@pascalcoin-sbx/common').BC;
const AES = require('./AES');
const elliptic = require('elliptic/lib/elliptic/ec/index');
/**
* AES encryption / decryption for PascalCoin.
*/
class ECDH {
/**
* Encrypts the given data with the given public key.
*
* @param {BC|Buffer|Uint8Array|String} data
* @param {PublicKey} publicKey
* @returns {BC}
*/
static encrypt(publicKey, data) {
data = BC.from(data);
let ecCurve = elliptic(publicKey.curve.name);
let tempKey = ecCurve.genKeyPair();
let pubkey = ecCurve.keyFromPublic(publicKey.ecdh.buffer);
let sharedSecret = tempKey.derive(pubkey.getPublic());
let secrectkey = Sha.sha512(new BC(sharedSecret.toArray()));
let encryptedData = AES.encryptZeroPadding(
secrectkey.slice(0, 32),
data,
new Uint8Array(16)
);
return {
data: encryptedData,
key: secrectkey.slice(32, 64),
publicKey: new BC(tempKey.getPublic(true, 'buffer'))
};
}
/**
* Decrypts the given data.
*
* @param {PrivateKey} privateKey
* @param {BC|Buffer|Uint8Array|String} publicKey
* @param {BC|Buffer|Uint8Array|String} data
* @returns {BC}
*/
static decrypt(privateKey, publicKey, data, origMsgLength) {
publicKey = BC.from(publicKey);
data = BC.from(data);
let ecCurve = elliptic(privateKey.curve.name);
let ecPrivateKey = ecCurve.keyFromPrivate(privateKey.key.buffer);
let ecPublicKey = ecCurve.keyFromPublic(publicKey.buffer);
let sharedSecret = ecPrivateKey.derive(ecPublicKey.getPublic());
let secrectKey = Sha.sha512(new BC(Buffer.from(sharedSecret.toArray())));
let decryptedData = AES.decryptZero(
secrectKey.slice(0, 32),
data,
new Uint8Array(16)
);
let decryptedDataWithPaddingRemoved = decryptedData.slice(0, origMsgLength);
return {
data: decryptedDataWithPaddingRemoved,
key: secrectKey.slice(32, 32)
};
}
}
module.exports = ECDH;
|