42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
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var Point = require('./browser/Point'),
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twoSha256 = require('../util').twoSha256,
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BigInteger = require('../browser/vendor-bundle.js').BigInteger;
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// TODO: use native modules instead of browser libraries
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/**
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* For now, this class can only supports derivation from public key
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* It doesn't support private key derivation (TODO).
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*
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* @example examples/Armory.js
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*/
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function Armory (chaincode, pubkey) {
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this.chaincode = new Buffer(chaincode, 'hex');
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this.pubkey = new Buffer(pubkey, 'hex');
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}
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Armory.prototype.generatePubKey = function () {
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var pubKey = this.pubkey;
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var chainCode = this.chaincode;
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var chainXor = twoSha256(pubKey);
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for (var i = 0; i < 32; i++)
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chainXor[i] ^= chainCode[i];
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var A = new BigInteger(chainXor.toString('hex'), 16);
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var pt = Point.fromUncompressedPubKey(pubKey);
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pt = Point.multiply(pt, A);
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var new_pubkey = pt.toUncompressedPubKey();
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return new_pubkey;
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};
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Armory.prototype.next = function () {
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var next_pubkey = this.generatePubKey();
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return new Armory(this.chaincode, next_pubkey);
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};
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module.exports = Armory;
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