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