55 lines
2.5 KiB
Java
55 lines
2.5 KiB
Java
package org.bouncycastle.crypto.ec;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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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.ECPublicKeyParameters;
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import org.bouncycastle.crypto.params.ParametersWithRandom;
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import org.bouncycastle.math.ec.ECMultiplier;
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import org.bouncycastle.math.ec.ECPoint;
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import org.bouncycastle.math.ec.FixedPointCombMultiplier;
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/* loaded from: classes6.dex */
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public class ECElGamalEncryptor implements ECEncryptor {
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private ECPublicKeyParameters key;
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private SecureRandom random;
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@Override // org.bouncycastle.crypto.ec.ECEncryptor
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public void init(CipherParameters cipherParameters) {
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SecureRandom secureRandom;
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if (cipherParameters instanceof ParametersWithRandom) {
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ParametersWithRandom parametersWithRandom = (ParametersWithRandom) cipherParameters;
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if (!(parametersWithRandom.getParameters() instanceof ECPublicKeyParameters)) {
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throw new IllegalArgumentException("ECPublicKeyParameters are required for encryption.");
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}
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this.key = (ECPublicKeyParameters) parametersWithRandom.getParameters();
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secureRandom = parametersWithRandom.getRandom();
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} else {
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if (!(cipherParameters instanceof ECPublicKeyParameters)) {
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throw new IllegalArgumentException("ECPublicKeyParameters are required for encryption.");
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}
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this.key = (ECPublicKeyParameters) cipherParameters;
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secureRandom = new SecureRandom();
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}
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this.random = secureRandom;
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}
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@Override // org.bouncycastle.crypto.ec.ECEncryptor
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public ECPair encrypt(ECPoint eCPoint) {
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ECPublicKeyParameters eCPublicKeyParameters = this.key;
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if (eCPublicKeyParameters == null) {
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throw new IllegalStateException("ECElGamalEncryptor not initialised");
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}
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ECDomainParameters parameters = eCPublicKeyParameters.getParameters();
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BigInteger generateK = ECUtil.generateK(parameters.getN(), this.random);
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ECPoint[] eCPointArr = {createBasePointMultiplier().multiply(parameters.getG(), generateK), this.key.getQ().multiply(generateK).add(eCPoint)};
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parameters.getCurve().normalizeAll(eCPointArr);
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return new ECPair(eCPointArr[0], eCPointArr[1]);
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}
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protected ECMultiplier createBasePointMultiplier() {
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return new FixedPointCombMultiplier();
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}
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}
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