lukechilds
/
bitcoincashjs
mirror of https://github.com/lukechilds/bitcoincashjs.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

signature

patch-2
Ryan X. Charles 11 years ago
parent
333c075ae7
commit
1a01674532
3 changed files with 260 additions and 0 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 1
      index.js
  2. 127
      lib/signature.js
  3. 132
      test/test.signature.js

1
index.js
View File

@ -19,6 +19,7 @@ privsec.point = require('./lib/point');
privsec.privkey = require('./lib/privkey');
privsec.pubkey = require('./lib/pubkey');
privsec.random = require('./lib/random');
privsec.signature = require('./lib/signature');
//privsec.script = require('lib/script');
//privsec.scriptexec = require('lib/scriptexec');

127
lib/signature.js
View File

@ -0,0 +1,127 @@
var bn = require('./bn');
var Signature = function(r, s) {
this.r = r;
this.s = s;
};
Signature.prototype.fromCompressed = function(buf) {
var b1 = buf.slice(0, 1)[0];
var b2 = buf.slice(1, 33);
var b3 = buf.slice(33, 65);
if (!(b1 === 0 || b1 === 1 || b1 === 2 || b1 === 3))
throw new Error('signature: i must be 0, 1, 2, or 3');
if (b2.length !== 32)
throw new Error('signature: r must be 32 bytes');
if (b3.length !== 32)
throw new Error('signature: s must be 32 bytes');
this.r = bn.fromBuffer(b2);
this.s = bn.fromBuffer(b3);
};
Signature.prototype.fromDER = function(buf) {
var obj = Signature.parseDER(buf);
this.r = obj.r;
this.s = obj.s;
};
Signature.prototype.fromString = function(str) {
var buf = new Buffer(str, 'hex');
this.fromDER(buf);
};
Signature.parseDER = function(buf) {
if (!Buffer.isBuffer(buf))
throw new Error('signature: DER formatted signature should be a buffer');
var header = buf[0];
if (header !== 0x30)
throw new Error('signature: Header byte should be 0x30');
var length = buf[1];
if (length !== buf.slice(2).length)
throw new Error('signature: Length byte should length of what follows');
var rheader = buf[2 + 0];
if (rheader !== 0x02)
throw new Error('signature: Integer byte for r should be 0x02');
var rlength = buf[2 + 1];
var rbuf = buf.slice(2 + 2, 2 + 2 + rlength);
var r = bn.fromBuffer(rbuf);
var rneg = buf[2 + 1 + 1] === 0x00 ? true : false;
if (rlength !== rbuf.length)
throw new Error('signature: Length of r incorrect');
var sheader = buf[2 + 2 + rlength + 0];
if (sheader !== 0x02)
throw new Error('signature: Integer byte for s should be 0x02');
var slength = buf[2 + 2 + rlength + 1];
var sbuf = buf.slice(2 + 2 + rlength + 2, 2 + 2 + rlength + 2 + slength);
var s = bn.fromBuffer(sbuf);
var sneg = buf[2 + 2 + rlength + 2 + 2] === 0x00 ? true : false;
if (slength !== sbuf.length)
throw new Error('signature: Length of s incorrect');
var sumlength = 2 + 2 + rlength + 2 + slength;
if (length !== sumlength - 2)
throw new Error('signature: Length of signature incorrect');
var obj = {
header: header,
length: length,
rheader: rheader,
rlength: rlength,
rneg: rneg,
rbuf: rbuf,
r: r,
sheader: sheader,
slength: slength,
sneg: sneg,
sbuf: sbuf,
s: s
};
return obj;
};
Signature.prototype.toCompressed = function(i) {
if (!(i === 0 || i === 1 || i ===2 || i ===3))
throw new Error('signature: i must be equal to 0, 1, 2, or 3');
var b1 = new Buffer([i]);
var b2 = this.r.toBuffer({size: 32});
var b3 = this.s.toBuffer({size: 32});
return Buffer.concat([b1, b2, b3]);
};
Signature.prototype.toDER = function() {
var rnbuf = this.r.toBuffer();
var snbuf = this.s.toBuffer();
var rneg = rnbuf[0] & 0x80 ? true : false;
var sneg = snbuf[0] & 0x80 ? true : false;
var rbuf = rneg ? Buffer.concat([new Buffer([0x00]), rnbuf]) : rnbuf;
var sbuf = sneg ? Buffer.concat([new Buffer([0x00]), snbuf]) : snbuf;
var length = 2 + rbuf.length + 2 + sbuf.length;
var rlength = rbuf.length;
var slength = sbuf.length;
var rheader = 0x02;
var sheader = 0x02;
var header = 0x30;
var der = Buffer.concat([new Buffer([header, length, rheader, rlength]), rbuf, new Buffer([sheader, slength]), sbuf]);
return der;
};
Signature.prototype.toString = function() {
var buf = this.toDER();
return buf.toString('hex');
};
module.exports = Signature;

132
test/test.signature.js
View File

@ -0,0 +1,132 @@
var bn = require('../lib/bn');
var should = require('chai').should();
var Signature = require('../lib/signature');
describe('Signature', function() {
it('should make a blank signature', function() {
var sig = new Signature();
should.exist(sig);
});
describe('#fromCompressed', function() {
it('should create a signature from a compressed signature', function() {
var blank = new Buffer(32);
blank.fill(0);
var compressed = Buffer.concat([
new Buffer([0]),
blank,
blank
]);
var sig = new Signature();
sig.fromCompressed(compressed);
sig.r.cmp(0).should.equal(0);
sig.s.cmp(0).should.equal(0);
});
});
describe('#fromDER', function() {
var buf = new Buffer('3044022075fc517e541bd54769c080b64397e32161c850f6c1b2b67a5c433affbb3e62770220729e85cc46ffab881065ec07694220e71d4df9b2b8c8fd12c3122cf3a5efbcf2', 'hex');
it('should parse this DER format signature', function() {
var sig = new Signature();
sig.fromDER(buf);
sig.r.toBuffer({size: 32}).toString('hex').should.equal('75fc517e541bd54769c080b64397e32161c850f6c1b2b67a5c433affbb3e6277');
sig.s.toBuffer({size: 32}).toString('hex').should.equal('729e85cc46ffab881065ec07694220e71d4df9b2b8c8fd12c3122cf3a5efbcf2');
});
});
describe('#fromString', function() {
var buf = new Buffer('3044022075fc517e541bd54769c080b64397e32161c850f6c1b2b67a5c433affbb3e62770220729e85cc46ffab881065ec07694220e71d4df9b2b8c8fd12c3122cf3a5efbcf2', 'hex');
it('should parse this DER format signature in hex', function() {
var sig = new Signature();
sig.fromString(buf.toString('hex'));
sig.r.toBuffer({size: 32}).toString('hex').should.equal('75fc517e541bd54769c080b64397e32161c850f6c1b2b67a5c433affbb3e6277');
sig.s.toBuffer({size: 32}).toString('hex').should.equal('729e85cc46ffab881065ec07694220e71d4df9b2b8c8fd12c3122cf3a5efbcf2');
});
});
describe('#parseDER', function() {
it('should parse this signature generated in node', function() {
var sighex = '30450221008bab1f0a2ff2f9cb8992173d8ad73c229d31ea8e10b0f4d4ae1a0d8ed76021fa02200993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72';
var sig = new Buffer(sighex, 'hex');
var parsed = Signature.parseDER(sig);
parsed.header.should.equal(0x30)
parsed.length.should.equal(69)
parsed.rlength.should.equal(33);
parsed.rneg.should.equal(true);
parsed.rbuf.toString('hex').should.equal('008bab1f0a2ff2f9cb8992173d8ad73c229d31ea8e10b0f4d4ae1a0d8ed76021fa');
parsed.r.toString().should.equal('63173831029936981022572627018246571655303050627048489594159321588908385378810');
parsed.slength.should.equal(32);
parsed.sneg.should.equal(false);
parsed.sbuf.toString('hex').should.equal('0993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72');
parsed.s.toString().should.equal('4331694221846364448463828256391194279133231453999942381442030409253074198130');
});
it('should parse this 69 byte signature', function() {
var sighex = '3043021f59e4705959cc78acbfcf8bd0114e9cc1b389a4287fb33152b73a38c319b50302202f7428a27284c757e409bf41506183e9e49dfb54d5063796dfa0d403a4deccfa';
var sig = new Buffer(sighex, 'hex');
var parsed = Signature.parseDER(sig);
parsed.header.should.equal(0x30)
parsed.length.should.equal(67)
parsed.rlength.should.equal(31);
parsed.rneg.should.equal(false);
parsed.rbuf.toString('hex').should.equal('59e4705959cc78acbfcf8bd0114e9cc1b389a4287fb33152b73a38c319b503');
parsed.r.toString().should.equal('158826015856106182499128681792325160381907915189052224498209222621383996675');
parsed.slength.should.equal(32);
parsed.sneg.should.equal(false);
parsed.sbuf.toString('hex').should.equal('2f7428a27284c757e409bf41506183e9e49dfb54d5063796dfa0d403a4deccfa');
parsed.s.toString().should.equal('21463938592353267769710297084836796652964571266930856168996063301532842380538');
});
it('should parse this 68 byte signature', function() {
var sighex = '3042021e17cfe77536c3fb0526bd1a72d7a8e0973f463add210be14063c8a9c37632022061bfa677f825ded82ba0863fb0c46ca1388dd3e647f6a93c038168b59d131a51';
var sig = new Buffer(sighex, 'hex');
var parsed = Signature.parseDER(sig);
parsed.header.should.equal(0x30)
parsed.length.should.equal(66)
parsed.rlength.should.equal(30);
parsed.rneg.should.equal(false);
parsed.rbuf.toString('hex').should.equal('17cfe77536c3fb0526bd1a72d7a8e0973f463add210be14063c8a9c37632');
parsed.r.toString().should.equal('164345250294671732127776123343329699648286106708464198588053542748255794');
parsed.slength.should.equal(32);
parsed.sneg.should.equal(false);
parsed.sbuf.toString('hex').should.equal('61bfa677f825ded82ba0863fb0c46ca1388dd3e647f6a93c038168b59d131a51');
parsed.s.toString().should.equal('44212963026209759051804639008236126356702363229859210154760104982946304432721');
});
});
describe('#toDER', function() {
it('should convert these known r and s values into a known signature', function() {
var r = bn('63173831029936981022572627018246571655303050627048489594159321588908385378810');
var s = bn('4331694221846364448463828256391194279133231453999942381442030409253074198130');
var sig = new Signature(r, s);
var der = sig.toDER(r, s);
der.toString('hex').should.equal('30450221008bab1f0a2ff2f9cb8992173d8ad73c229d31ea8e10b0f4d4ae1a0d8ed76021fa02200993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72');
});
});
describe('#toString', function() {
it('should convert this signature in to hex DER', function() {
var r = bn('63173831029936981022572627018246571655303050627048489594159321588908385378810');
var s = bn('4331694221846364448463828256391194279133231453999942381442030409253074198130');
var sig = new Signature(r, s);
var hex = sig.toString();
hex.should.equal('30450221008bab1f0a2ff2f9cb8992173d8ad73c229d31ea8e10b0f4d4ae1a0d8ed76021fa02200993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72');
});
});
});
Write Preview
Loading…
Cancel
Save