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package org.bouncycastle.cms;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.BEROctetString;
import org.bouncycastle.asn1.BERSet;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.cms.AuthenticatedData;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.io.TeeOutputStream;
/**
* General class for generating a CMS authenticated-data message.
*
* A simple example of usage.
*
* <pre>
* CMSAuthenticatedDataGenerator fact = new CMSAuthenticatedDataGenerator();
*
* adGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(recipientCert).setProvider("BC"));
*
* CMSAuthenticatedData data = fact.generate(new CMSProcessableByteArray(data),
* new JceCMSMacCalculatorBuilder(CMSAlgorithm.DES_EDE3_CBC).setProvider(BC).build()));
* </pre>
*/
public class CMSAuthenticatedDataGenerator
extends CMSAuthenticatedGenerator
{
/**
* base constructor
*/
public CMSAuthenticatedDataGenerator()
{
}
/**
* Generate an authenticated data object from the passed in typedData and MacCalculator.
*
* @param typedData the data to have a MAC attached.
* @param macCalculator the calculator of the MAC to be attached.
* @return the resulting CMSAuthenticatedData object.
* @throws CMSException on failure in encoding data or processing recipients.
*/
public CMSAuthenticatedData generate(CMSTypedData typedData, MacCalculator macCalculator)
throws CMSException
{
return generate(typedData, macCalculator, null);
}
/**
* Generate an authenticated data object from the passed in typedData and MacCalculator.
*
* @param typedData the data to have a MAC attached.
* @param macCalculator the calculator of the MAC to be attached.
* @param digestCalculator calculator for computing digest of the encapsulated data.
* @return the resulting CMSAuthenticatedData object.
* @throws CMSException on failure in encoding data or processing recipients.
*/
public CMSAuthenticatedData generate(CMSTypedData typedData, MacCalculator macCalculator, final DigestCalculator digestCalculator)
throws CMSException
{
ASN1EncodableVector recipientInfos = new ASN1EncodableVector();
ASN1OctetString encContent;
ASN1OctetString macResult;
for (Iterator it = recipientInfoGenerators.iterator(); it.hasNext();)
{
RecipientInfoGenerator recipient = (RecipientInfoGenerator)it.next();
recipientInfos.add(recipient.generate(macCalculator.getKey()));
}
AuthenticatedData authData;
if (digestCalculator != null)
{
try
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
OutputStream out = new TeeOutputStream(digestCalculator.getOutputStream(), bOut);
typedData.write(out);
out.close();
encContent = new BEROctetString(bOut.toByteArray());
}
catch (IOException e)
{
throw new CMSException("unable to perform digest calculation: " + e.getMessage(), e);
}
Map parameters = getBaseParameters(typedData.getContentType(), digestCalculator.getAlgorithmIdentifier(), digestCalculator.getDigest());
if (authGen == null)
{
authGen = new DefaultAuthenticatedAttributeTableGenerator();
}
ASN1Set authed = new DERSet(authGen.getAttributes(Collections.unmodifiableMap(parameters)).toASN1EncodableVector());
try
{
OutputStream mOut = macCalculator.getOutputStream();
mOut.write(authed.getEncoded(ASN1Encoding.DER));
mOut.close();
macResult = new DEROctetString(macCalculator.getMac());
}
catch (IOException e)
{
throw new CMSException("exception decoding algorithm parameters.", e);
}
ASN1Set unauthed = (unauthGen != null) ? new BERSet(unauthGen.getAttributes(Collections.unmodifiableMap(parameters)).toASN1EncodableVector()) : null;
ContentInfo eci = new ContentInfo(
CMSObjectIdentifiers.data,
encContent);
authData = new AuthenticatedData(originatorInfo, new DERSet(recipientInfos), macCalculator.getAlgorithmIdentifier(), digestCalculator.getAlgorithmIdentifier(), eci, authed, macResult, unauthed);
}
else
{
try
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
OutputStream mOut = new TeeOutputStream(bOut, macCalculator.getOutputStream());
typedData.write(mOut);
mOut.close();
encContent = new BEROctetString(bOut.toByteArray());
macResult = new DEROctetString(macCalculator.getMac());
}
catch (IOException e)
{
throw new CMSException("exception decoding algorithm parameters.", e);
}
ASN1Set unauthed = (unauthGen != null) ? new BERSet(unauthGen.getAttributes(new HashMap()).toASN1EncodableVector()) : null;
ContentInfo eci = new ContentInfo(
CMSObjectIdentifiers.data,
encContent);
authData = new AuthenticatedData(originatorInfo, new DERSet(recipientInfos), macCalculator.getAlgorithmIdentifier(), null, eci, null, macResult, unauthed);
}
ContentInfo contentInfo = new ContentInfo(
CMSObjectIdentifiers.authenticatedData, authData);
return new CMSAuthenticatedData(contentInfo, new DigestCalculatorProvider()
{
public DigestCalculator get(AlgorithmIdentifier digestAlgorithmIdentifier)
throws OperatorCreationException
{
return digestCalculator;
}
});
}
}
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