39 lines
1.7 KiB
Java
39 lines
1.7 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.ECDomainParameters;
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import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
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import org.bouncycastle.crypto.params.ECPublicKeyParameters;
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import org.bouncycastle.math.ec.ECPoint;
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/* loaded from: classes6.dex */
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public class ECDHCBasicAgreement implements BasicAgreement {
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ECPrivateKeyParameters key;
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@Override // org.bouncycastle.crypto.BasicAgreement
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public void init(CipherParameters cipherParameters) {
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this.key = (ECPrivateKeyParameters) cipherParameters;
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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().getCurve().getFieldSize() + 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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ECPublicKeyParameters eCPublicKeyParameters = (ECPublicKeyParameters) cipherParameters;
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ECDomainParameters parameters = eCPublicKeyParameters.getParameters();
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if (!parameters.equals(this.key.getParameters())) {
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throw new IllegalStateException("ECDHC public key has wrong domain parameters");
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}
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ECPoint normalize = eCPublicKeyParameters.getQ().multiply(parameters.getH().multiply(this.key.getD()).mod(parameters.getN())).normalize();
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if (normalize.isInfinity()) {
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throw new IllegalStateException("Infinity is not a valid agreement value for ECDHC");
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}
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return normalize.getAffineXCoord().toBigInteger();
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}
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}
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