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Added deterministic signing and added a public key class. Note that getPub should now be replaced with getPub().export('bytes')

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This commit is contained in:
Vitalik Buterin 2014-01-04 13:26:03 -05:00
commit 30e8b572d6
7 changed files with 130 additions and 120 deletions

30
src/ecdsa.js
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@ -2,6 +2,7 @@ var sec = require('./jsbn/sec');
var util = require('./util');
var SecureRandom = require('./jsbn/rng');
var BigInteger = require('./jsbn/jsbn');
var conv = require('./convert')
var ECPointFp = require('./jsbn/ec').ECPointFp;
@ -36,6 +37,19 @@ function implShamirsTrick(P, k, Q, l)
return R;
};
function deterministicGenerateK(hash,key) {
var v = [];
var k = [];
for (var i = 0;i < 32;i++) v.push(1);
for (var i = 0;i < 32;i++) k.push(0);
k = Bitcoin.Crypto.HMAC(Bitcoin.Crypto.SHA256,v.concat([0]).concat(key).concat(hash),k,{ asBytes: true })
v = Bitcoin.Crypto.HMAC(Bitcoin.Crypto.SHA256,v,k,{ asBytes: true })
k = Bitcoin.Crypto.HMAC(Bitcoin.Crypto.SHA256,v.concat([1]).concat(key).concat(hash),k,{ asBytes: true })
v = Bitcoin.Crypto.HMAC(Bitcoin.Crypto.SHA256,v,k,{ asBytes: true })
v = Bitcoin.Crypto.HMAC(Bitcoin.Crypto.SHA256,v,k,{ asBytes: true })
return Bitcoin.BigInteger.fromByteArrayUnsigned(v);
}
var ECDSA = {
getBigRandom: function (limit) {
return new BigInteger(limit.bitLength(), rng)
@ -48,12 +62,10 @@ var ECDSA = {
var n = ecparams.getN();
var e = BigInteger.fromByteArrayUnsigned(hash);
do {
var k = ECDSA.getBigRandom(n);
var G = ecparams.getG();
var Q = G.multiply(k);
var r = Q.getX().toBigInteger().mod(n);
} while (r.compareTo(BigInteger.ZERO) <= 0);
var k = deterministicGenerateK(hash,priv.toByteArrayUnsigned())
var G = ecparams.getG();
var Q = G.multiply(k);
var r = Q.getX().toBigInteger().mod(n);
var s = k.modInverse(n).multiply(e.add(d.multiply(r))).mod(n);
@ -258,10 +270,8 @@ var ECDSA = {
// TODO (shtylman) this is stupid because this file and eckey
// have circular dependencies
var ECKey = require('./eckey');
var pubKey = ECKey();
pubKey.pub = Q;
return pubKey;
var ECPubKey = require('./eckey').ECPubKey;
return ECPubKey(Q);
},
/**