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package org.spongycastle.operator.bc;
import java.security.SecureRandom;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.crypto.AsymmetricBlockCipher;
import org.spongycastle.crypto.CipherParameters;
import org.spongycastle.crypto.InvalidCipherTextException;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.params.ParametersWithRandom;
import org.spongycastle.operator.AsymmetricKeyWrapper;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.OperatorException;
public abstract class BcAsymmetricKeyWrapper
extends AsymmetricKeyWrapper
{
private AsymmetricKeyParameter publicKey;
private SecureRandom random;
public BcAsymmetricKeyWrapper(AlgorithmIdentifier encAlgId, AsymmetricKeyParameter publicKey)
{
super(encAlgId);
this.publicKey = publicKey;
}
public BcAsymmetricKeyWrapper setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public byte[] generateWrappedKey(GenericKey encryptionKey)
throws OperatorException
{
AsymmetricBlockCipher keyEncryptionCipher = createAsymmetricWrapper(getAlgorithmIdentifier().getAlgorithm());
CipherParameters params = publicKey;
if (random != null)
{
params = new ParametersWithRandom(params, random);
}
try
{
byte[] keyEnc = OperatorUtils.getKeyBytes(encryptionKey);
keyEncryptionCipher.init(true, publicKey);
return keyEncryptionCipher.processBlock(keyEnc, 0, keyEnc.length);
}
catch (InvalidCipherTextException e)
{
throw new OperatorException("unable to encrypt contents key", e);
}
}
protected abstract AsymmetricBlockCipher createAsymmetricWrapper(ASN1ObjectIdentifier algorithm);
}
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