27 lines
1010 B
Java
27 lines
1010 B
Java
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package org.bouncycastle.crypto.ec;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
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import org.bouncycastle.math.ec.ECPoint;
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/* loaded from: classes6.dex */
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public class ECElGamalDecryptor implements ECDecryptor {
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private ECPrivateKeyParameters key;
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@Override // org.bouncycastle.crypto.ec.ECDecryptor
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public void init(CipherParameters cipherParameters) {
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if (!(cipherParameters instanceof ECPrivateKeyParameters)) {
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throw new IllegalArgumentException("ECPrivateKeyParameters are required for decryption.");
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}
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this.key = (ECPrivateKeyParameters) cipherParameters;
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}
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@Override // org.bouncycastle.crypto.ec.ECDecryptor
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public ECPoint decrypt(ECPair eCPair) {
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if (this.key == null) {
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throw new IllegalStateException("ECElGamalDecryptor not initialised");
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}
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return eCPair.getY().subtract(eCPair.getX().multiply(this.key.getD())).normalize();
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}
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}
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