47 lines
2.3 KiB
Java
47 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.DSAKeyGenerationParameters;
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import org.bouncycastle.crypto.params.DSAParameters;
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import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
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import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
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import org.bouncycastle.math.ec.WNafUtil;
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import org.bouncycastle.util.BigIntegers;
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/* loaded from: classes6.dex */
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public class DSAKeyPairGenerator implements AsymmetricCipherKeyPairGenerator {
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private static final BigInteger ONE = BigInteger.valueOf(1);
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private DSAKeyGenerationParameters 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 = (DSAKeyGenerationParameters) 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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DSAParameters parameters = this.param.getParameters();
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BigInteger generatePrivateKey = generatePrivateKey(parameters.getQ(), this.param.getRandom());
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) new DSAPublicKeyParameters(calculatePublicKey(parameters.getP(), parameters.getG(), generatePrivateKey), parameters), (AsymmetricKeyParameter) new DSAPrivateKeyParameters(generatePrivateKey, parameters));
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}
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private static BigInteger generatePrivateKey(BigInteger bigInteger, SecureRandom secureRandom) {
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BigInteger createRandomInRange;
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int bitLength = bigInteger.bitLength();
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do {
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BigInteger bigInteger2 = ONE;
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createRandomInRange = BigIntegers.createRandomInRange(bigInteger2, bigInteger.subtract(bigInteger2), secureRandom);
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} while (WNafUtil.getNafWeight(createRandomInRange) < (bitLength >>> 2));
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return createRandomInRange;
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}
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private static BigInteger calculatePublicKey(BigInteger bigInteger, BigInteger bigInteger2, BigInteger bigInteger3) {
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return bigInteger2.modPow(bigInteger3, bigInteger);
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}
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}
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