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use elliptic in Point in the browser instead of cryptojs

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This commit is contained in:
Ryan X. Charles 2014-07-04 11:54:41 -07:00
parent c8fe404402
commit 15d4328b35
3 changed files with 47 additions and 77 deletions
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91
lib/browser/Point.js
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@ -3,10 +3,7 @@
var Key = require('./Key'); var Key = require('./Key');
var bignum = require('bignum'); var bignum = require('bignum');
var assert = require('assert'); var assert = require('assert');
var ECPointFp = require('../../browser/vendor-bundle.js').ECPointFp; var elliptic = require('elliptic');
var ECFieldElementFp = require('../../browser/vendor-bundle.js').ECFieldElementFp;
var getSECCurveByName = require('../../browser/vendor-bundle.js').getSECCurveByName;
var BigInteger = require('../../browser/vendor-bundle.js').BigInteger;
//a point on the secp256k1 curve //a point on the secp256k1 curve
//x and y are bignums //x and y are bignums
@ -16,81 +13,21 @@ var Point = function(x, y) {
}; };
Point.add = function(p1, p2) { Point.add = function(p1, p2) {
var ecparams = getSECCurveByName('secp256k1'); var ec = elliptic.curves.secp256k1;
var ecp1 = ec.curve.point(p1.x, p1.y);
var p1xhex = p1.x.toBuffer({ var ecp2 = ec.curve.point(p2.x, p2.y);
size: 32 var ecp3 = ecp1.add(ecp2);
}).toString('hex'); //var p3 = ec.curve.point(ecp3.x, ecp3.y);
var p1x = new BigInteger(p1xhex, 16); var p3 = new Point(ecp3.x, ecp3.y);
var p1yhex = p1.y.toBuffer({ return p3;
size: 32
}).toString('hex');
var p1y = new BigInteger(p1yhex, 16);
var p1px = new ECFieldElementFp(ecparams.getCurve().getQ(), p1x);
var p1py = new ECFieldElementFp(ecparams.getCurve().getQ(), p1y);
var p1p = new ECPointFp(ecparams.getCurve(), p1px, p1py);
var p2xhex = p2.x.toBuffer({
size: 32
}).toString('hex');
var p2x = new BigInteger(p2xhex, 16);
var p2yhex = p2.y.toBuffer({
size: 32
}).toString('hex');
var p2y = new BigInteger(p2yhex, 16);
var p2px = new ECFieldElementFp(ecparams.getCurve().getQ(), p2x);
var p2py = new ECFieldElementFp(ecparams.getCurve().getQ(), p2y);
var p2p = new ECPointFp(ecparams.getCurve(), p2px, p2py);
var p = p1p.add(p2p);
var point = new Point();
var pointxbuf = new Buffer(p.getX().toBigInteger().toByteArrayUnsigned());
point.x = bignum.fromBuffer(pointxbuf, {
size: pointxbuf.length
});
assert(pointxbuf.length <= 32);
var pointybuf = new Buffer(p.getY().toBigInteger().toByteArrayUnsigned());
assert(pointybuf.length <= 32);
point.y = bignum.fromBuffer(pointybuf, {
size: pointybuf.length
});
return point;
}; };
Point.multiply = function(p1, x) { Point.multiply = function(p1, xbuf) {
var x = new BigInteger(x.toString('hex'), 16); var ec = elliptic.curves.secp256k1;
var ecp1 = ec.curve.point(p1.x, p1.y);
var ecparams = getSECCurveByName('secp256k1'); var ecp = ecp1.mul(xbuf);
var p = new Point(ecp.x, ecp.y);
var p1xhex = p1.x.toBuffer({ return p;
size: 32
}).toString('hex');
var p1x = new BigInteger(p1xhex, 16);
var p1yhex = p1.y.toBuffer({
size: 32
}).toString('hex');
var p1y = new BigInteger(p1yhex, 16);
var p1px = new ECFieldElementFp(ecparams.getCurve().getQ(), p1x);
var p1py = new ECFieldElementFp(ecparams.getCurve().getQ(), p1y);
var p1p = new ECPointFp(ecparams.getCurve(), p1px, p1py);
var p = p1p.multiply(x);
var point = new Point();
var pointxbuf = new Buffer(p.getX().toBigInteger().toByteArrayUnsigned());
point.x = bignum.fromBuffer(pointxbuf, {
size: pointxbuf.length
});
assert(pointxbuf.length <= 32);
var pointybuf = new Buffer(p.getY().toBigInteger().toByteArrayUnsigned());
assert(pointybuf.length <= 32);
point.y = bignum.fromBuffer(pointybuf, {
size: pointybuf.length
});
return point;
}; };
//convert the public key of a Key into a Point //convert the public key of a Key into a Point

1
package.json
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@ -64,6 +64,7 @@
"mocha": ">=1.15.1", "mocha": ">=1.15.1",
"sjcl": "=1.0.1", "sjcl": "=1.0.1",
"bn.js": "=0.13.2", "bn.js": "=0.13.2",
"elliptic": "=0.15.7",
"bindings": "=1.1.1", "bindings": "=1.1.1",
"bufferput": "git://github.com/bitpay/node-bufferput.git", "bufferput": "git://github.com/bitpay/node-bufferput.git",
"bignum": "=0.6.2", "bignum": "=0.6.2",

32
test/test.Point.js
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@ -68,4 +68,36 @@ describe('Point', function() {
point.y.toBuffer({size: 32}).toString('hex').should.equal(ayhex); point.y.toBuffer({size: 32}).toString('hex').should.equal(ayhex);
}); });
describe('#multiply', function() {
it('should multiply this number by 2', function() {
var axhex = "69b154b42ff9452c31251cb341d7db01ad603dc56d64f9c5fb9e7031b89a241d";
var axbuf = new Buffer(axhex, 'hex');
var ayhex = "eeedc91342b3c8982c1e676435780fe5f9d62f3f692e8d1512485d77fab35997";
var aybuf = new Buffer(ayhex, 'hex');
var a = new Point(bignum.fromBuffer(axbuf, {size: 32}), bignum.fromBuffer(aybuf, {size: 32}));
var x = new bignum(2);
var xbuf = x.toBuffer({size: 32});
var mult = Point.multiply(a, xbuf);
mult.x.toBuffer({size: 32}).toString('hex').should.equal('f81b3dcae4eeb504d2898500721ece357767b9564bdf03dce95a3db12de72d3a');
mult.y.toBuffer({size: 32}).toString('hex').should.equal('e0220ac6e8524ca3f80c2c65a390dacc0371a6875afc8546d621eb20284e5568');
});
it('should multiply this number by 200', function() {
var axhex = "69b154b42ff9452c31251cb341d7db01ad603dc56d64f9c5fb9e7031b89a241d";
var axbuf = new Buffer(axhex, 'hex');
var ayhex = "eeedc91342b3c8982c1e676435780fe5f9d62f3f692e8d1512485d77fab35997";
var aybuf = new Buffer(ayhex, 'hex');
var a = new Point(bignum.fromBuffer(axbuf, {size: 32}), bignum.fromBuffer(aybuf, {size: 32}));
var x = new bignum(200);
var xbuf = x.toBuffer({size: 32});
var mult = Point.multiply(a, xbuf);
mult.x.toBuffer({size: 32}).toString('hex').should.equal('91c03d9104df24f01d69702c680a53a9b46ba49de89ab27819ea02c61229bace');
mult.y.toBuffer({size: 32}).toString('hex').should.equal('5d2fdbdeab06383f14b2702e893444be5e80af58cecb9a70c1ae22e9daab69c1');
});
});
}); });