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[CHORE] Modified functions not to overwrite entire prototype

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Evan Schwartz
2014-04-23 10:59:15 -07:00
parent 7f59fb917c
commit 8275e036c9
1 changed files with 20 additions and 24 deletions
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44
src/js/sjcl-custom/sjcl-validecc.js
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@@ -1,30 +1,26 @@
sjcl.ecc.ecdsa.secretKey.prototype = {
sign: function(hash, paranoia) {
var R = this._curve.r,
l = R.bitLength(),
k = sjcl.bn.random(R.sub(1), paranoia).add(1),
r = this._curve.G.mult(k).x.mod(R),
s = sjcl.bn.fromBits(hash).add(r.mul(this._exponent)).mul(k.inverseMod(R)).mod(R);
sjcl.ecc.ecdsa.secretKey.prototype.sign = function(hash, paranoia) {
var R = this._curve.r,
l = R.bitLength(),
k = sjcl.bn.random(R.sub(1), paranoia).add(1),
r = this._curve.G.mult(k).x.mod(R),
s = sjcl.bn.fromBits(hash).add(r.mul(this._exponent)).mul(k.inverseMod(R)).mod(R);
return sjcl.bitArray.concat(r.toBits(l), s.toBits(l));
}
return sjcl.bitArray.concat(r.toBits(l), s.toBits(l));
};
sjcl.ecc.ecdsa.publicKey.prototype = {
verify: function(hash, rs) {
var w = sjcl.bitArray,
R = this._curve.r,
l = R.bitLength(),
r = sjcl.bn.fromBits(w.bitSlice(rs,0,l)),
s = sjcl.bn.fromBits(w.bitSlice(rs,l,2*l)),
sInv = s.inverseMod(R),
hG = sjcl.bn.fromBits(hash).mul(sInv).mod(R),
hA = r.mul(sInv).mod(R),
r2 = this._curve.G.mult2(hG, hA, this._point).x;
sjcl.ecc.ecdsa.publicKey.prototype.verify = function(hash, rs) {
var w = sjcl.bitArray,
R = this._curve.r,
l = R.bitLength(),
r = sjcl.bn.fromBits(w.bitSlice(rs,0,l)),
s = sjcl.bn.fromBits(w.bitSlice(rs,l,2*l)),
sInv = s.inverseMod(R),
hG = sjcl.bn.fromBits(hash).mul(sInv).mod(R),
hA = r.mul(sInv).mod(R),
r2 = this._curve.G.mult2(hG, hA, this._point).x;
if (r.equals(0) || s.equals(0) || r.greaterEquals(R) || s.greaterEquals(R) || !r2.equals(r)) {
throw (new sjcl.exception.corrupt("signature didn't check out"));
}
return true;
if (r.equals(0) || s.equals(0) || r.greaterEquals(R) || s.greaterEquals(R) || !r2.equals(r)) {
throw (new sjcl.exception.corrupt("signature didn't check out"));
}
return true;
};