39 lines
1.9 KiB
Java
39 lines
1.9 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.GOST3410KeyGenerationParameters;
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import org.bouncycastle.crypto.params.GOST3410Parameters;
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import org.bouncycastle.crypto.params.GOST3410PrivateKeyParameters;
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import org.bouncycastle.crypto.params.GOST3410PublicKeyParameters;
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import org.bouncycastle.math.ec.WNafUtil;
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/* loaded from: classes6.dex */
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public class GOST3410KeyPairGenerator implements AsymmetricCipherKeyPairGenerator {
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private GOST3410KeyGenerationParameters param;
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public void init(KeyGenerationParameters keyGenerationParameters) {
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this.param = (GOST3410KeyGenerationParameters) keyGenerationParameters;
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}
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@Override // org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator
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public AsymmetricCipherKeyPair generateKeyPair() {
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GOST3410Parameters parameters = this.param.getParameters();
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SecureRandom random = this.param.getRandom();
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BigInteger q = parameters.getQ();
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BigInteger p = parameters.getP();
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BigInteger a = parameters.getA();
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while (true) {
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BigInteger bigInteger = new BigInteger(256, random);
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if (bigInteger.signum() > 0 && bigInteger.compareTo(q) < 0 && WNafUtil.getNafWeight(bigInteger) >= 64) {
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) new GOST3410PublicKeyParameters(a.modPow(bigInteger, p), parameters), (AsymmetricKeyParameter) new GOST3410PrivateKeyParameters(bigInteger, parameters));
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}
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}
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}
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}
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