51 lines
3.1 KiB
Java
51 lines
3.1 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.CramerShoupKeyGenerationParameters;
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import org.bouncycastle.crypto.params.CramerShoupParameters;
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import org.bouncycastle.crypto.params.CramerShoupPrivateKeyParameters;
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import org.bouncycastle.crypto.params.CramerShoupPublicKeyParameters;
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import org.bouncycastle.util.BigIntegers;
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/* loaded from: classes6.dex */
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public class CramerShoupKeyPairGenerator implements AsymmetricCipherKeyPairGenerator {
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private static final BigInteger ONE = BigInteger.valueOf(1);
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private CramerShoupKeyGenerationParameters 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 = (CramerShoupKeyGenerationParameters) 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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CramerShoupParameters parameters = this.param.getParameters();
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CramerShoupPrivateKeyParameters generatePrivateKey = generatePrivateKey(this.param.getRandom(), parameters);
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CramerShoupPublicKeyParameters calculatePublicKey = calculatePublicKey(parameters, generatePrivateKey);
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generatePrivateKey.setPk(calculatePublicKey);
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return new AsymmetricCipherKeyPair((AsymmetricKeyParameter) calculatePublicKey, (AsymmetricKeyParameter) generatePrivateKey);
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}
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private BigInteger generateRandomElement(BigInteger bigInteger, SecureRandom secureRandom) {
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BigInteger bigInteger2 = ONE;
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return BigIntegers.createRandomInRange(bigInteger2, bigInteger.subtract(bigInteger2), secureRandom);
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}
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private CramerShoupPrivateKeyParameters generatePrivateKey(SecureRandom secureRandom, CramerShoupParameters cramerShoupParameters) {
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BigInteger p = cramerShoupParameters.getP();
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return new CramerShoupPrivateKeyParameters(cramerShoupParameters, generateRandomElement(p, secureRandom), generateRandomElement(p, secureRandom), generateRandomElement(p, secureRandom), generateRandomElement(p, secureRandom), generateRandomElement(p, secureRandom));
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}
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private CramerShoupPublicKeyParameters calculatePublicKey(CramerShoupParameters cramerShoupParameters, CramerShoupPrivateKeyParameters cramerShoupPrivateKeyParameters) {
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BigInteger g1 = cramerShoupParameters.getG1();
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BigInteger g2 = cramerShoupParameters.getG2();
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BigInteger p = cramerShoupParameters.getP();
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return new CramerShoupPublicKeyParameters(cramerShoupParameters, g1.modPow(cramerShoupPrivateKeyParameters.getX1(), p).multiply(g2.modPow(cramerShoupPrivateKeyParameters.getX2(), p)), g1.modPow(cramerShoupPrivateKeyParameters.getY1(), p).multiply(g2.modPow(cramerShoupPrivateKeyParameters.getY2(), p)), g1.modPow(cramerShoupPrivateKeyParameters.getZ(), p));
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}
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}
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