org.bouncycastle.cms.jcajce.JceKeyTransAuthenticatedRecipient Maven / Gradle / Ivy
package org.bouncycastle.cms.jcajce;
import java.io.OutputStream;
import java.security.Key;
import java.security.PrivateKey;
import javax.crypto.Mac;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.RecipientOperator;
import org.bouncycastle.jcajce.io.MacOutputStream;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.jcajce.JceGenericKey;
/**
* the KeyTransRecipientInformation class for a recipient who has been sent a secret
* key encrypted using their public key that needs to be used to
* extract the message.
*/
public class JceKeyTransAuthenticatedRecipient
extends JceKeyTransRecipient
{
public JceKeyTransAuthenticatedRecipient(PrivateKey recipientKey)
{
super(recipientKey);
}
public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentMacAlgorithm, byte[] encryptedContentEncryptionKey)
throws CMSException
{
final Key secretKey = extractSecretKey(keyEncryptionAlgorithm, contentMacAlgorithm, encryptedContentEncryptionKey);
final Mac dataMac = contentHelper.createContentMac(secretKey, contentMacAlgorithm);
return new RecipientOperator(new MacCalculator()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return contentMacAlgorithm;
}
public GenericKey getKey()
{
return new JceGenericKey(contentMacAlgorithm, secretKey);
}
public OutputStream getOutputStream()
{
return new MacOutputStream(dataMac);
}
public byte[] getMac()
{
return dataMac.doFinal();
}
});
}
}