57 lines
2.0 KiB
Java
57 lines
2.0 KiB
Java
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package org.bouncycastle.math.ec;
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import java.math.BigInteger;
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/* loaded from: classes6.dex */
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public class MixedNafR2LMultiplier extends AbstractECMultiplier {
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protected int additionCoord;
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protected int doublingCoord;
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@Override // org.bouncycastle.math.ec.AbstractECMultiplier
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protected ECPoint multiplyPositive(ECPoint eCPoint, BigInteger bigInteger) {
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ECCurve curve = eCPoint.getCurve();
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ECCurve configureCurve = configureCurve(curve, this.additionCoord);
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ECCurve configureCurve2 = configureCurve(curve, this.doublingCoord);
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int[] generateCompactNaf = WNafUtil.generateCompactNaf(bigInteger);
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ECPoint infinity = configureCurve.getInfinity();
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ECPoint importPoint = configureCurve2.importPoint(eCPoint);
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int i = 0;
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ECPoint eCPoint2 = infinity;
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int i2 = 0;
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while (i < generateCompactNaf.length) {
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int i3 = generateCompactNaf[i];
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importPoint = importPoint.timesPow2(i2 + (65535 & i3));
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ECPoint importPoint2 = configureCurve.importPoint(importPoint);
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if ((i3 >> 16) < 0) {
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importPoint2 = importPoint2.negate();
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}
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eCPoint2 = eCPoint2.add(importPoint2);
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i++;
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i2 = 1;
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}
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return curve.importPoint(eCPoint2);
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}
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protected ECCurve configureCurve(ECCurve eCCurve, int i) {
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if (eCCurve.getCoordinateSystem() == i) {
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return eCCurve;
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}
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if (eCCurve.supportsCoordinateSystem(i)) {
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return eCCurve.configure().setCoordinateSystem(i).create();
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}
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StringBuilder sb = new StringBuilder("Coordinate system ");
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sb.append(i);
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sb.append(" not supported by this curve");
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throw new IllegalArgumentException(sb.toString());
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}
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public MixedNafR2LMultiplier(int i, int i2) {
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this.additionCoord = i;
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this.doublingCoord = i2;
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}
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public MixedNafR2LMultiplier() {
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this(2, 4);
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}
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}
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