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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.6. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.
package org.bouncycastle.cms;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.BEROctetStringGenerator;
import org.bouncycastle.asn1.BERSequenceGenerator;
import org.bouncycastle.asn1.BERSet;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.io.IOException;
import java.io.OutputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.util.Iterator;
/**
* General class for generating a CMS enveloped-data message stream.
*
* A simple example of usage.
*
* CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();
*
* edGen.addKeyTransRecipient(cert);
*
* ByteArrayOutputStream bOut = new ByteArrayOutputStream();
*
* OutputStream out = edGen.open(
* bOut, CMSEnvelopedDataGenerator.AES128_CBC, "BC");*
* out.write(data);
*
* out.close();
*
*/
public class CMSEnvelopedDataStreamGenerator
extends CMSEnvelopedGenerator
{
private Object _originatorInfo = null;
private Object _unprotectedAttributes = null;
private int _bufferSize;
private boolean _berEncodeRecipientSet;
/**
* base constructor
*/
public CMSEnvelopedDataStreamGenerator()
{
}
/**
* Set the underlying string size for encapsulated data
*
* @param bufferSize length of octet strings to buffer the data.
*/
public void setBufferSize(
int bufferSize)
{
_bufferSize = bufferSize;
}
/**
* Use a BER Set to store the recipient information
*/
public void setBEREncodeRecipients(
boolean berEncodeRecipientSet)
{
_berEncodeRecipientSet = berEncodeRecipientSet;
}
private DERInteger getVersion()
{
if (_originatorInfo != null || _unprotectedAttributes != null)
{
return new DERInteger(2);
}
else
{
return new DERInteger(0);
}
}
/**
* generate an enveloped object that contains an CMS Enveloped Data
* object using the given provider and the passed in key generator.
* @throws IOException
*/
private OutputStream open(
OutputStream out,
String encryptionOID,
KeyGenerator keyGen,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException, CMSException
{
String encProvider = keyGen.getProvider().getName();
SecretKey encKey = keyGen.generateKey();
AlgorithmParameters params = generateParameters(encryptionOID, encKey, encProvider);
Iterator it = recipientInfs.iterator();
ASN1EncodableVector recipientInfos = new ASN1EncodableVector();
while (it.hasNext())
{
RecipientInf recipient = (RecipientInf)it.next();
try
{
recipientInfos.add(recipient.toRecipientInfo(encKey, provider));
}
catch (IOException e)
{
throw new CMSException("encoding error.", e);
}
catch (InvalidKeyException e)
{
throw new CMSException("key inappropriate for algorithm.", e);
}
catch (GeneralSecurityException e)
{
throw new CMSException("error making encrypted content.", e);
}
}
return open(out, encryptionOID, encKey, params, recipientInfos, encProvider);
}
protected OutputStream open(
OutputStream out,
String encryptionOID,
SecretKey encKey,
AlgorithmParameters params,
ASN1EncodableVector recipientInfos,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException, CMSException
{
try
{
//
// ContentInfo
//
BERSequenceGenerator cGen = new BERSequenceGenerator(out);
cGen.addObject(CMSObjectIdentifiers.envelopedData);
//
// Encrypted Data
//
BERSequenceGenerator envGen = new BERSequenceGenerator(cGen.getRawOutputStream(), 0, true);
envGen.addObject(getVersion());
if (_berEncodeRecipientSet)
{
envGen.getRawOutputStream().write(new BERSet(recipientInfos).getEncoded());
}
else
{
envGen.getRawOutputStream().write(new DERSet(recipientInfos).getEncoded());
}
Cipher cipher = CMSEnvelopedHelper.INSTANCE.getSymmetricCipher(encryptionOID, provider);
cipher.init(Cipher.ENCRYPT_MODE, encKey, params);
BERSequenceGenerator eiGen = new BERSequenceGenerator(envGen.getRawOutputStream());
eiGen.addObject(PKCSObjectIdentifiers.data);
//
// If params are null we try and second guess on them as some providers don't provide
// algorithm parameter generation explicity but instead generate them under the hood.
//
if (params == null)
{
params = cipher.getParameters();
}
AlgorithmIdentifier encAlgId = getAlgorithmIdentifier(encryptionOID, params);
eiGen.getRawOutputStream().write(encAlgId.getEncoded());
BEROctetStringGenerator octGen = new BEROctetStringGenerator(eiGen.getRawOutputStream(), 0, false);
CipherOutputStream cOut;
if (_bufferSize != 0)
{
cOut = new CipherOutputStream(octGen.getOctetOutputStream(new byte[_bufferSize]), cipher);
}
else
{
cOut = new CipherOutputStream(octGen.getOctetOutputStream(), cipher);
}
return new CmsEnvelopedDataOutputStream(cOut, cGen, envGen, eiGen);
}
catch (NoSuchAlgorithmException e)
{
throw new CMSException("can't find algorithm.", e);
}
catch (InvalidKeyException e)
{
throw new CMSException("key invalid in message.", e);
}
catch (NoSuchPaddingException e)
{
throw new CMSException("required padding not supported.", e);
}
catch (InvalidAlgorithmParameterException e)
{
throw new CMSException("algorithm parameters invalid.", e);
}
catch (IOException e)
{
throw new CMSException("exception decoding algorithm parameters.", e);
}
}
/**
* generate an enveloped object that contains an CMS Enveloped Data
* object using the given provider.
* @throws IOException
*/
public OutputStream open(
OutputStream out,
String encryptionOID,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException, CMSException, IOException
{
try
{
KeyGenerator keyGen = CMSEnvelopedHelper.INSTANCE.createSymmetricKeyGenerator(encryptionOID, provider);
return open(out, encryptionOID, keyGen, provider);
}
catch (NoSuchAlgorithmException e)
{
throw new CMSException("can't find key generation algorithm.", e);
}
}
/**
* generate an enveloped object that contains an CMS Enveloped Data
* object using the given provider.
* @throws IOException
*/
public OutputStream open(
OutputStream out,
String encryptionOID,
int keySize,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException, CMSException, IOException
{
try
{
KeyGenerator keyGen = CMSEnvelopedHelper.INSTANCE.createSymmetricKeyGenerator(encryptionOID, provider);
keyGen.init(keySize);
return open(out, encryptionOID, keyGen, provider);
}
catch (NoSuchAlgorithmException e)
{
throw new CMSException("can't find key generation algorithm.", e);
}
}
private class CmsEnvelopedDataOutputStream
extends OutputStream
{
private CipherOutputStream _out;
private BERSequenceGenerator _cGen;
private BERSequenceGenerator _envGen;
private BERSequenceGenerator _eiGen;
public CmsEnvelopedDataOutputStream(
CipherOutputStream out,
BERSequenceGenerator cGen,
BERSequenceGenerator envGen,
BERSequenceGenerator eiGen)
{
_out = out;
_cGen = cGen;
_envGen = envGen;
_eiGen = eiGen;
}
public void write(
int b)
throws IOException
{
_out.write(b);
}
public void write(
byte[] bytes,
int off,
int len)
throws IOException
{
_out.write(bytes, off, len);
}
public void write(
byte[] bytes)
throws IOException
{
_out.write(bytes);
}
public void close()
throws IOException
{
_out.close();
_eiGen.close();
// [TODO] unprotected attributes go here
_envGen.close();
_cGen.close();
}
}
}