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expose signature internal functions

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"sign" and "genk" ... and add some signature tests
This commit is contained in:
Ryan X. Charles 2014-07-17 15:24:19 -07:00
parent 2c136d4dcc
commit 57a55d0863
3 changed files with 54 additions and 22 deletions
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23
lib/browser/Key.js
View File

@ -117,27 +117,6 @@ Key.prototype.regenerateSync = function() {
Key.prototype.signSync = function(hash) { Key.prototype.signSync = function(hash) {
var ec = elliptic.curves.secp256k1; var ec = elliptic.curves.secp256k1;
var genk = function() {
//TODO: account for when >= n
return new bignum(SecureRandom.getRandomBuffer(8));
};
var sign = function(hash, priv) {
var d = priv;
var n = Point.getN();
var e = new bignum(hash);
do {
var k = genk();
var G = Point.getG();
var Q = Point.multiply(G, k);
var r = Q.x.mod(n);
var s = k.invm(n).mul(e.add(d.mul(r))).mod(n);
} while (r.cmp(new bignum(0)) <= 0 || s.cmp(new bignum(0)) <= 0);
return {r: r, s: s};
};
if (!this.private) { if (!this.private) {
throw new Error('Key does not have a private key set'); throw new Error('Key does not have a private key set');
} }
@ -146,7 +125,7 @@ Key.prototype.signSync = function(hash) {
throw new Error('Arg should be a 32 bytes hash buffer'); throw new Error('Arg should be a 32 bytes hash buffer');
} }
var privnum = new bignum(this.private); var privnum = new bignum(this.private);
var sigrs = sign(hash, privnum); var sigrs = Key.sign(hash, privnum);
var der = Key.rs2DER(sigrs.r, sigrs.s); var der = Key.rs2DER(sigrs.r, sigrs.s);
return der; return der;

21
lib/common/Key.js
View File

@ -80,4 +80,25 @@ Key.rs2DER = function(r, s) {
return der; return der;
}; };
Key.sign = function(hash, priv, k) {
var d = priv;
var n = Point.getN();
var e = new bignum(hash);
do {
var k = k || Key.genk();
var G = Point.getG();
var Q = Point.multiply(G, k);
var r = Q.x.mod(n);
var s = k.invm(n).mul(e.add(d.mul(r))).mod(n);
} while (r.cmp(new bignum(0)) <= 0 || s.cmp(new bignum(0)) <= 0);
return {r: r, s: s};
};
Key.genk = function() {
//TODO: account for when >= n
return new bignum(SecureRandom.getRandomBuffer(8));
};
module.exports = Key; module.exports = Key;

32
test/test.Key.js
View File

@ -148,6 +148,38 @@ describe('Key (ECKey)', function() {
parsed.sbuf.toString('hex').should.equal('0993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72'); parsed.sbuf.toString('hex').should.equal('0993a6ec81755b9111762fc2cf8e3ede73047515622792110867d12654275e72');
parsed.s.toString().should.equal('4331694221846364448463828256391194279133231453999942381442030409253074198130'); 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 = Key.parseDERsig(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 = Key.parseDERsig(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('#rs2DER', function() { describe('#rs2DER', function() {