55 lines
2.6 KiB
Java
55 lines
2.6 KiB
Java
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package org.bouncycastle.crypto.agreement;
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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.CipherParameters;
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import org.bouncycastle.crypto.generators.DHKeyPairGenerator;
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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import org.bouncycastle.crypto.params.DHKeyGenerationParameters;
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import org.bouncycastle.crypto.params.DHParameters;
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import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
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import org.bouncycastle.crypto.params.DHPublicKeyParameters;
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import org.bouncycastle.crypto.params.ParametersWithRandom;
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/* loaded from: classes6.dex */
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public class DHAgreement {
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private DHParameters dhParams;
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private DHPrivateKeyParameters key;
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private BigInteger privateValue;
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private SecureRandom random;
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public void init(CipherParameters cipherParameters) {
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if (cipherParameters instanceof ParametersWithRandom) {
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ParametersWithRandom parametersWithRandom = (ParametersWithRandom) cipherParameters;
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this.random = parametersWithRandom.getRandom();
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cipherParameters = parametersWithRandom.getParameters();
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} else {
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this.random = new SecureRandom();
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}
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AsymmetricKeyParameter asymmetricKeyParameter = (AsymmetricKeyParameter) cipherParameters;
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if (!(asymmetricKeyParameter instanceof DHPrivateKeyParameters)) {
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throw new IllegalArgumentException("DHEngine expects DHPrivateKeyParameters");
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}
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DHPrivateKeyParameters dHPrivateKeyParameters = (DHPrivateKeyParameters) asymmetricKeyParameter;
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this.key = dHPrivateKeyParameters;
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this.dhParams = dHPrivateKeyParameters.getParameters();
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}
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public BigInteger calculateMessage() {
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DHKeyPairGenerator dHKeyPairGenerator = new DHKeyPairGenerator();
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dHKeyPairGenerator.init(new DHKeyGenerationParameters(this.random, this.dhParams));
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AsymmetricCipherKeyPair generateKeyPair = dHKeyPairGenerator.generateKeyPair();
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this.privateValue = ((DHPrivateKeyParameters) generateKeyPair.getPrivate()).getX();
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return ((DHPublicKeyParameters) generateKeyPair.getPublic()).getY();
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}
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public BigInteger calculateAgreement(DHPublicKeyParameters dHPublicKeyParameters, BigInteger bigInteger) {
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if (!dHPublicKeyParameters.getParameters().equals(this.dhParams)) {
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throw new IllegalArgumentException("Diffie-Hellman public key has wrong parameters.");
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}
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BigInteger p = this.dhParams.getP();
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return bigInteger.modPow(this.key.getX(), p).multiply(dHPublicKeyParameters.getY().modPow(this.privateValue, p)).mod(p);
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}
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}
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