49 lines
2.3 KiB
Java
49 lines
2.3 KiB
Java
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package org.bouncycastle.crypto.generators;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
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import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;
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import org.bouncycastle.crypto.KeyGenerationParameters;
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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import org.bouncycastle.crypto.params.ECDomainParameters;
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import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
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import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
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import org.bouncycastle.crypto.params.ECPublicKeyParameters;
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import org.bouncycastle.math.ec.ECConstants;
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import org.bouncycastle.math.ec.ECMultiplier;
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import org.bouncycastle.math.ec.FixedPointCombMultiplier;
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import org.bouncycastle.math.ec.WNafUtil;
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/* loaded from: classes6.dex */
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public class ECKeyPairGenerator implements AsymmetricCipherKeyPairGenerator, ECConstants {
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ECDomainParameters params;
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SecureRandom random;
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public void init(KeyGenerationParameters keyGenerationParameters) {
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ECKeyGenerationParameters eCKeyGenerationParameters = (ECKeyGenerationParameters) keyGenerationParameters;
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this.random = eCKeyGenerationParameters.getRandom();
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this.params = eCKeyGenerationParameters.getDomainParameters();
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if (this.random == null) {
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this.random = new SecureRandom();
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}
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}
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public AsymmetricCipherKeyPair generateKeyPair() {
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BigInteger n = this.params.getN();
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int bitLength = n.bitLength();
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while (true) {
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BigInteger bigInteger = new BigInteger(bitLength, this.random);
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if (bigInteger.compareTo(TWO) >= 0 && bigInteger.compareTo(n) < 0 && WNafUtil.getNafWeight(bigInteger) >= (bitLength >>> 2)) {
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) new ECPublicKeyParameters(createBasePointMultiplier().multiply(this.params.getG(), bigInteger), this.params), (AsymmetricKeyParameter) new ECPrivateKeyParameters(bigInteger, this.params));
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}
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}
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}
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protected ECMultiplier createBasePointMultiplier() {
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return new FixedPointCombMultiplier();
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}
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}
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