48 lines
2.0 KiB
Java
48 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 FixedPointUtil {
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public static final String PRECOMP_NAME = "bc_fixed_point";
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public static FixedPointPreCompInfo precompute(ECPoint eCPoint, int i) {
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ECCurve curve = eCPoint.getCurve();
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int i2 = 1 << i;
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FixedPointPreCompInfo fixedPointPreCompInfo = getFixedPointPreCompInfo(curve.getPreCompInfo(eCPoint, PRECOMP_NAME));
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ECPoint[] preComp = fixedPointPreCompInfo.getPreComp();
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if (preComp == null || preComp.length < i2) {
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int combSize = ((getCombSize(curve) + i) - 1) / i;
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ECPoint[] eCPointArr = new ECPoint[i];
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eCPointArr[0] = eCPoint;
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for (int i3 = 1; i3 < i; i3++) {
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eCPointArr[i3] = eCPointArr[i3 - 1].timesPow2(combSize);
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}
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curve.normalizeAll(eCPointArr);
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ECPoint[] eCPointArr2 = new ECPoint[i2];
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eCPointArr2[0] = curve.getInfinity();
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for (int i4 = i - 1; i4 >= 0; i4--) {
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ECPoint eCPoint2 = eCPointArr[i4];
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int i5 = 1 << i4;
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for (int i6 = i5; i6 < i2; i6 += i5 << 1) {
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eCPointArr2[i6] = eCPointArr2[i6 - i5].add(eCPoint2);
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}
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}
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curve.normalizeAll(eCPointArr2);
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fixedPointPreCompInfo.setPreComp(eCPointArr2);
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fixedPointPreCompInfo.setWidth(i);
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curve.setPreCompInfo(eCPoint, PRECOMP_NAME, fixedPointPreCompInfo);
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}
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return fixedPointPreCompInfo;
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}
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public static FixedPointPreCompInfo getFixedPointPreCompInfo(PreCompInfo preCompInfo) {
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return (preCompInfo == null || !(preCompInfo instanceof FixedPointPreCompInfo)) ? new FixedPointPreCompInfo() : (FixedPointPreCompInfo) preCompInfo;
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}
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public static int getCombSize(ECCurve eCCurve) {
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BigInteger order = eCCurve.getOrder();
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return order == null ? eCCurve.getFieldSize() + 1 : order.bitLength();
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}
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}
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