Added Electrum.js which allows Electrum style key derivation
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var Key = require('../lib/Key');
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var Address = require('../lib/Address');
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var k = new Key();
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//k.public = new Buffer('92eea4d2f5263651db9e3222caded1fd4c89772f79a7c03fb6afc00e9d2c9d2ed9b86c2c95fc1171e49163079dacb7f048b3c509a27a490e1df9e7128362d468', 'hex');
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//k.public = new Buffer('0492eea4d2f5263651db9e3222caded1fd4c89772f79a7c03fb6afc00e9d2c9d2ed9b86c2c95fc1171e49163079dacb7f048b3c509a27a490e1df9e7128362d468', 'hex');
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//k.public = new Buffer('0478d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71a1518063243acd4dfe96b66e3f2ec8013c8e072cd09b3834a19f81f659cc3455', 'hex');
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//k.generatePubKey();
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//debugger;
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//console.log(k);
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var Electrum = require('../lib/Electrum');
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//92eea4d2f5263651db9e3222caded1fd4c89772f79a7c03fb6afc00e9d2c9d2ed9b86c2c95fc1171e49163079dacb7f048b3c509a27a490e1df9e7128362d468
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var mpk = '92eea4d2f5263651db9e3222caded1fd4c89772f79a7c03fb6afc00e9d2c9d2ed9b86c2c95fc1171e49163079dacb7f048b3c509a27a490e1df9e7128362d468';
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mpk = new Electrum(mpk);
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var key1 = mpk.generatePubKey(0);
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var addr1 = Address.fromPubKey(key1);
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console.log(addr1.as('base58'));
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var Key = require('./Key'),
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Point = require('./Point'),
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twoSha256 = require('../util').twoSha256,
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buffertools = require('buffertools'),
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bignum = require('bignum');
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/**
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* Pre-BIP32 Electrum public key derivation (electrum <2.0)
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*
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* @example examples/ElectrumMPK.js
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*/
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function Electrum (master_public_key) {
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this.mpk = new Buffer(master_public_key, 'hex');
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}
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Electrum.prototype.getSequence = function (for_change, n) {
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var mode = for_change ? 1 : 0;
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var buf = Buffer.concat([ new Buffer(n + ':' + mode + ':', 'utf8'), this.mpk ]);
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return bignum.fromBuffer(twoSha256(buf));
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};
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Electrum.prototype.generatePubKey = function (n, for_change) {
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var x = bignum.fromBuffer(this.mpk.slice(0, 32), { size: 32 });
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var y = bignum.fromBuffer(this.mpk.slice(32, 64), { size: 32 });
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var mpk_pt = new Point(x, y);
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var sequence = this.getSequence(false, n);
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var sequence_key = new Key();
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sequence_key.private = sequence.toBuffer();
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sequence_key.regenerateSync();
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var sequence_pt = Point.fromKey(sequence_key);
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pt = Point.add(mpk_pt, sequence_pt);
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var xbuf = pt.x.toBuffer({ size: 32 });
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var ybuf = pt.y.toBuffer({ size: 32 });
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var prefix = new Buffer([0x04]);
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var key = new Key();
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key.compressed = false;
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key.public = Buffer.concat([prefix, xbuf, ybuf]);
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return key.public;
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};
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Electrum.prototype.generateChangePubKey = function (sequence) {
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return this.generatePubKey(sequence, true);
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};
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module.exports = Electrum;
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@ -317,6 +317,7 @@ Key::SetPublic(Local<String> property, Local<Value> value, const AccessorInfo& i
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if (!ret) {
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// TODO: Error
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VException("Invalid public key.");
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return;
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}
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