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pubkey

This commit is contained in:
Ryan X. Charles 2014-08-07 16:18:17 -07:00
parent 3df3d41434
commit 448f532738
3 changed files with 164 additions and 1 deletions
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2
index.js
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@ -16,9 +16,9 @@ privsec.constants = require('./lib/constants');
privsec.hash = require('./lib/hash');
privsec.point = require('./lib/point');
privsec.privkey = require('./lib/privkey');
privsec.pubkey = require('./lib/pubkey');
//privsec.key = require('lib/key');
//privsec.pubkey = require('lib/pubkey');
//privsec.script = require('lib/script');
//privsec.scriptexec = require('lib/scriptexec');
//privsec.tx = require('lib/tx');

67
lib/pubkey.js Normal file
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@ -0,0 +1,67 @@
var point = require('./point');
var bn = require('./bn');
var Pubkey = function(p) {
this.p = p;
};
Pubkey.prototype.fromDER = function(buf) {
if (buf[0] == 0x04) {
var xbuf = buf.slice(1, 33);
var ybuf = buf.slice(33, 65);
if (xbuf.length !== 32 || ybuf.length !== 32 || buf.length !== 65)
throw new Error('pubkey: Length of x and y must be 32 bytes');
var x = bn(xbuf);
var y = bn(ybuf);
this.p = point(x, y);
} else if (buf[0] == 0x03) {
var xbuf = buf.slice(1);
var x = bn(xbuf);
this.fromX(true, x);
} else if (buf[0] == 0x02) {
var xbuf = buf.slice(1);
var x = bn(xbuf);
this.fromX(false, x);
} else {
throw new Error('pubkey: Invalid DER format pubkey');
}
};
Pubkey.prototype.fromString = function(str) {
this.fromDER(new Buffer(str, 'hex'));
};
Pubkey.prototype.fromX = function(odd, x) {
if (typeof odd !== 'boolean')
throw new Error('pubkey: Must specify whether y is odd or not (true or false)');
this.p = point.fromX(odd, x);
};
Pubkey.prototype.toDER = function(compressed) {
if (typeof compressed !== 'boolean')
throw new Error('pubkey: Must specify whether the public key is compressed or not (true or false)');
var x = this.p.getX();
var y = this.p.getY();
var xbuf = x.toBuffer({size: 32});
var ybuf = y.toBuffer({size: 32});
if (!compressed) {
var prefix = new Buffer([0x04]);
return Buffer.concat([prefix, xbuf, ybuf]);
} else {
var odd = ybuf[ybuf.length - 1] % 2;
if (odd)
var prefix = new Buffer([0x03]);
else
var prefix = new Buffer([0x02]);
return Buffer.concat([prefix, xbuf]);
}
};
Pubkey.prototype.toString = function() {
return this.toDER(true).toString('hex');
};
module.exports = Pubkey;

96
test/test.pubkey.js Normal file
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@ -0,0 +1,96 @@
var should = require('chai').should();
var pubkey = require('../lib/pubkey');
var point = require('../lib/point');
var bn = require('../lib/bn');
describe('pubkey', function() {
it('should create a blank public key', function() {
var pk = new pubkey();
should.exist(pk);
});
it('should create a public key with a point', function() {
var p = point();
var pk = new pubkey(p);
should.exist(pk.p);
});
describe('#fromDER', function() {
it('should parse this uncompressed public key', function() {
var pk = new pubkey();
pk.fromDER(new Buffer('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341', 'hex'));
pk.p.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
pk.p.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
});
it('should parse this compressed public key', function() {
var pk = new pubkey();
pk.fromDER(new Buffer('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
pk.p.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
pk.p.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
});
it('should throw an error on this invalid public key', function() {
var pk = new pubkey();
(function() {
pk.fromDER(new Buffer('091ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
}).should.throw();
});
});
describe('#fromString', function() {
it('should parse this known valid public key', function() {
pk = new pubkey();
pk.fromString('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
pk.p.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
pk.p.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
});
});
describe('#fromX', function() {
it('should create this known public key', function() {
var x = bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
var pk = new pubkey();
pk.fromX(true, x);
pk.p.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
pk.p.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
});
});
describe('#toDER', function() {
it('should return this compressed DER format', function() {
var x = bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
var pk = new pubkey();
pk.fromX(true, x);
pk.toDER(true).toString('hex').should.equal('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
});
it('should return this uncompressed DER format', function() {
var x = bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
var pk = new pubkey();
pk.fromX(true, x);
pk.toDER(false).toString('hex').should.equal('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
});
});
describe('#toString', function() {
it('should print this known public key', function() {
var hex = '031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a';
var pk = new pubkey();
pk.fromString(hex);
pk.toString().should.equal(hex);
});
});
});