org.bouncycastle.cms.bc.BcRSAKeyTransEnvelopedRecipient Maven / Gradle / Ivy
package org.bouncycastle.cms.bc;
import java.io.InputStream;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.RecipientOperator;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.io.CipherInputStream;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.operator.InputDecryptor;
public class BcRSAKeyTransEnvelopedRecipient
extends BcKeyTransRecipient
{
public BcRSAKeyTransEnvelopedRecipient(AsymmetricKeyParameter key)
{
super(key);
}
public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
throws CMSException
{
CipherParameters secretKey = extractSecretKey(keyEncryptionAlgorithm, contentEncryptionAlgorithm, encryptedContentEncryptionKey);
final Object dataCipher = EnvelopedDataHelper.createContentCipher(false, secretKey, contentEncryptionAlgorithm);
return new RecipientOperator(new InputDecryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return contentEncryptionAlgorithm;
}
public InputStream getInputStream(InputStream dataIn)
{
if (dataCipher instanceof BufferedBlockCipher)
{
return new CipherInputStream(dataIn, (BufferedBlockCipher)dataCipher);
}
else
{
return new CipherInputStream(dataIn, (StreamCipher)dataCipher);
}
}
});
}
}