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package org.spongycastle.cms.bc;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.KeyTransRecipient;
import org.spongycastle.crypto.CipherParameters;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.operator.AsymmetricKeyUnwrapper;
import org.spongycastle.operator.OperatorException;
import org.spongycastle.operator.bc.BcRSAAsymmetricKeyUnwrapper;
public abstract class BcKeyTransRecipient
implements KeyTransRecipient
{
private AsymmetricKeyParameter recipientKey;
public BcKeyTransRecipient(AsymmetricKeyParameter recipientKey)
{
this.recipientKey = recipientKey;
}
protected CipherParameters extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedEncryptionKey)
throws CMSException
{
AsymmetricKeyUnwrapper unwrapper = new BcRSAAsymmetricKeyUnwrapper(keyEncryptionAlgorithm, recipientKey);
try
{
return CMSUtils.getBcKey(unwrapper.generateUnwrappedKey(encryptedKeyAlgorithm, encryptedEncryptionKey));
}
catch (OperatorException e)
{
throw new CMSException("exception unwrapping key: " + e.getMessage(), e);
}
}
}
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