45 lines
2.0 KiB
Java
45 lines
2.0 KiB
Java
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package org.bouncycastle.crypto.agreement;
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import java.math.BigInteger;
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import org.bouncycastle.crypto.BasicAgreement;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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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 DHBasicAgreement implements BasicAgreement {
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private DHParameters dhParams;
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private DHPrivateKeyParameters key;
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@Override // org.bouncycastle.crypto.BasicAgreement
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public void init(CipherParameters cipherParameters) {
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if (cipherParameters instanceof ParametersWithRandom) {
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cipherParameters = ((ParametersWithRandom) cipherParameters).getParameters();
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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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@Override // org.bouncycastle.crypto.BasicAgreement
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public int getFieldSize() {
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return (this.key.getParameters().getP().bitLength() + 7) / 8;
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}
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@Override // org.bouncycastle.crypto.BasicAgreement
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public BigInteger calculateAgreement(CipherParameters cipherParameters) {
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DHPublicKeyParameters dHPublicKeyParameters = (DHPublicKeyParameters) cipherParameters;
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if (dHPublicKeyParameters.getParameters().equals(this.dhParams)) {
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return dHPublicKeyParameters.getY().modPow(this.key.getX(), this.dhParams.getP());
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}
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throw new IllegalArgumentException("Diffie-Hellman public key has wrong parameters.");
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}
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}
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