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