40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
"use strict";
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var imports = require('soop').imports();
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var bignum = imports.bignum || require('../Bignum');
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var CPPKey = imports.CPPKey || require('bindings')('KeyModule').Key;
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var assert = require('assert');
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//a point on the secp256k1 curve
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//x and y are bignums
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var Point = function(x, y) {
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this.x = x;
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this.y = y;
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};
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Point.add = function(p1, p2) {
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var u1 = p1.toUncompressedPubKey();
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var u2 = p2.toUncompressedPubKey();
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var pubKey = CPPKey.addUncompressed(u1, u2);
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return Point.fromUncompressedPubKey(pubKey);
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};
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//convert the public key of a Key into a Point
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Point.fromUncompressedPubKey = function(pubkey) {
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var point = new Point();
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point.x = bignum.fromBuffer(pubkey.slice(1, 33), {size: 32});
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point.y = bignum.fromBuffer(pubkey.slice(33, 65), {size: 32});
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return point;
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};
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//convert the Point into the Key containing a compressed public key
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Point.prototype.toUncompressedPubKey = function() {
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var xbuf = this.x.toBuffer({size: 32});
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var ybuf = this.y.toBuffer({size: 32});
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var prefix = new Buffer([0x04]);
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var pubkey = Buffer.concat([prefix, xbuf, ybuf]);
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return pubkey;
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};
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module.exports = require('soop')(Point);
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