31 lines
1.4 KiB
Java
31 lines
1.4 KiB
Java
package org.bouncycastle.math.ec;
|
|
|
|
import java.math.BigInteger;
|
|
import org.bouncycastle.math.ec.endo.GLVEndomorphism;
|
|
|
|
/* loaded from: classes6.dex */
|
|
public class GLVMultiplier extends AbstractECMultiplier {
|
|
protected final ECCurve curve;
|
|
protected final GLVEndomorphism glvEndomorphism;
|
|
|
|
@Override // org.bouncycastle.math.ec.AbstractECMultiplier
|
|
protected ECPoint multiplyPositive(ECPoint eCPoint, BigInteger bigInteger) {
|
|
if (!this.curve.equals(eCPoint.getCurve())) {
|
|
throw new IllegalStateException();
|
|
}
|
|
BigInteger[] decomposeScalar = this.glvEndomorphism.decomposeScalar(bigInteger.mod(eCPoint.getCurve().getOrder()));
|
|
BigInteger bigInteger2 = decomposeScalar[0];
|
|
BigInteger bigInteger3 = decomposeScalar[1];
|
|
ECPointMap pointMap = this.glvEndomorphism.getPointMap();
|
|
return this.glvEndomorphism.hasEfficientPointMap() ? ECAlgorithms.implShamirsTrickWNaf(eCPoint, bigInteger2, pointMap, bigInteger3) : ECAlgorithms.implShamirsTrickWNaf(eCPoint, bigInteger2, pointMap.map(eCPoint), bigInteger3);
|
|
}
|
|
|
|
public GLVMultiplier(ECCurve eCCurve, GLVEndomorphism gLVEndomorphism) {
|
|
if (eCCurve == null || eCCurve.getOrder() == null) {
|
|
throw new IllegalArgumentException("Need curve with known group order");
|
|
}
|
|
this.curve = eCCurve;
|
|
this.glvEndomorphism = gLVEndomorphism;
|
|
}
|
|
}
|