org.bouncycastle.cms.bc.BcRSAKeyTransEnvelopedRecipient.java Source code

Introduction

Here is the source code for org.bouncycastle.cms.bc.BcRSAKeyTransEnvelopedRecipient.java

Source

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);
                }
            }
        });
    }
}