7f348ca0bd
...no longer relies on Manuel's repo hostig a version of "bignum" that actually
contained bignumber.js. This moves bignumber.js internally and removes bignum
from the browser build process. Also adds a bitcore.Bignum that links to the
right thing. In node, browser.Bignum is require('bignum'). And in the browser,
bitcore.Bignum is is now Bignumber.js (same as before ... except bignumber.js
is now inside bitcore).
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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