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cleanup some unused ec.js code

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This commit is contained in:
Kyle Drake 2014-05-24 13:33:23 +10:00
parent b6addfdfc8
commit bc062fbdce
1 changed files with 0 additions and 80 deletions
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80
src/ec.js
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@ -287,20 +287,6 @@ ECCurveFp.prototype.equals = curveFpEquals;
ECCurveFp.prototype.getInfinity = curveFpGetInfinity;
ECCurveFp.prototype.fromBigInteger = curveFpFromBigInteger;
// prepends 0 if bytes < len
// cuts off start if bytes > len
function integerToBytes(i, len) {
var bytes = i.toByteArrayUnsigned();
if (len < bytes.length) {
bytes = bytes.slice(bytes.length-len);
} else while (len > bytes.length) {
bytes.unshift(0);
}
return bytes;
};
ECFieldElementFp.prototype.getByteLength = function () {
return Math.floor((this.toBigInteger().bitLength() + 7) / 8);
};
@ -370,72 +356,6 @@ ECPointFp.decodeFrom = function (curve, buffer) {
}
}
ECPointFp.prototype.add2D = function (b) {
if(this.isInfinity()) return b;
if(b.isInfinity()) return this;
if (this.x.equals(b.x)) {
if (this.y.equals(b.y)) {
// this = b, i.e. this must be doubled
return this.twice();
}
// this = -b, i.e. the result is the point at infinity
return this.curve.getInfinity();
}
var x_x = b.x.subtract(this.x);
var y_y = b.y.subtract(this.y);
var gamma = y_y.divide(x_x);
var x3 = gamma.square().subtract(this.x).subtract(b.x);
var y3 = gamma.multiply(this.x.subtract(x3)).subtract(this.y);
return new ECPointFp(this.curve, x3, y3);
};
ECPointFp.prototype.twice2D = function () {
if (this.isInfinity()) return this;
if (this.y.toBigInteger().signum() === 0) {
// if y1 == 0, then (x1, y1) == (x1, -y1)
// and hence this = -this and thus 2(x1, y1) == infinity
return this.curve.getInfinity();
}
var FpTWO = this.curve.fromBigInteger(TWO);
var FpTHREE = this.curve.fromBigInteger(THREE)
var gamma = this.x.square().multiply(FpTHREE).add(this.curve.a).divide(this.y.multiply(FpTWO));
var x3 = gamma.square().subtract(this.x.multiply(FpTWO));
var y3 = gamma.multiply(this.x.subtract(x3)).subtract(this.y);
return new ECPointFp(this.curve, x3, y3);
};
ECPointFp.prototype.multiply2D = function (k) {
if(this.isInfinity()) return this;
if (k.signum() === 0) return this.curve.getInfinity()
var e = k;
var h = e.multiply(THREE)
var neg = this.negate();
var R = this;
var i;
for (i = h.bitLength() - 2; i > 0; --i) {
R = R.twice();
var hBit = h.testBit(i);
var eBit = e.testBit(i);
if (hBit != eBit) {
R = R.add2D(hBit ? this : neg);
}
}
return R;
};
ECPointFp.prototype.isOnCurve = function () {
var x = this.getX().toBigInteger();
var y = this.getY().toBigInteger();