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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle
intended for the Android platform. Android unfortunately ships with a stripped-down version of
Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full,
up-to-date version of the Bouncy Castle cryptographic libs.
package org.spongycastle.cms.jcajce;
import java.io.IOException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.Provider;
import java.util.HashMap;
import java.util.Map;
import org.spongycastle.asn1.ASN1Encoding;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.KeyTransRecipient;
import org.spongycastle.cms.KeyTransRecipientId;
import org.spongycastle.operator.OperatorException;
import org.spongycastle.operator.jcajce.JceKTSKeyUnwrapper;
import org.spongycastle.util.encoders.Hex;
public abstract class JceKTSKeyTransRecipient
implements KeyTransRecipient
{
private static final byte[] ANONYMOUS_SENDER = Hex.decode("0c14416e6f6e796d6f75732053656e64657220202020"); // "Anonymous Sender "
private final byte[] partyVInfo;
private PrivateKey recipientKey;
protected EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
protected EnvelopedDataHelper contentHelper = helper;
protected Map extraMappings = new HashMap();
protected boolean validateKeySize = false;
protected boolean unwrappedKeyMustBeEncodable;
public JceKTSKeyTransRecipient(PrivateKey recipientKey, byte[] partyVInfo)
{
this.recipientKey = recipientKey;
this.partyVInfo = partyVInfo;
}
/**
* Set the provider to use for key recovery and content processing.
*
* @param provider provider to use.
* @return this recipient.
*/
public JceKTSKeyTransRecipient setProvider(Provider provider)
{
this.helper = new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));
this.contentHelper = helper;
return this;
}
/**
* Set the provider to use for key recovery and content processing.
*
* @param providerName the name of the provider to use.
* @return this recipient.
*/
public JceKTSKeyTransRecipient setProvider(String providerName)
{
this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));
this.contentHelper = helper;
return this;
}
/**
* Internally algorithm ids are converted into cipher names using a lookup table. For some providers
* the standard lookup table won't work. Use this method to establish a specific mapping from an
* algorithm identifier to a specific algorithm.
*
* For example:
*
* unwrapper.setAlgorithmMapping(PKCSObjectIdentifiers.rsaEncryption, "RSA");
*
*
* @param algorithm OID of algorithm in recipient.
* @param algorithmName JCE algorithm name to use.
* @return the current Recipient.
*/
public JceKTSKeyTransRecipient setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
{
extraMappings.put(algorithm, algorithmName);
return this;
}
/**
* Set the provider to use for content processing. If providerName is null a "no provider" search will be
* used to satisfy getInstance calls.
*
* @param provider the provider to use.
* @return this recipient.
*/
public JceKTSKeyTransRecipient setContentProvider(Provider provider)
{
this.contentHelper = CMSUtils.createContentHelper(provider);
return this;
}
/**
* Set the provider to use for content processing. If providerName is null a "no provider" search will be
* used to satisfy getInstance calls.
*
* @param providerName the name of the provider to use.
* @return this recipient.
*/
public JceKTSKeyTransRecipient setContentProvider(String providerName)
{
this.contentHelper = CMSUtils.createContentHelper(providerName);
return this;
}
/**
* Set validation of retrieved key sizes against the algorithm parameters for the encrypted key where possible - default is off.
*
* This setting will not have any affect if the encryption algorithm in the recipient does not specify a particular key size, or
* if the unwrapper is a HSM and the byte encoding of the unwrapped secret key is not available.
*
* @param doValidate true if unwrapped key's should be validated against the content encryption algorithm, false otherwise.
* @return this recipient.
*/
public JceKTSKeyTransRecipient setKeySizeValidation(boolean doValidate)
{
this.validateKeySize = doValidate;
return this;
}
protected Key extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedEncryptionKey)
throws CMSException
{
JceKTSKeyUnwrapper unwrapper = helper.createAsymmetricUnwrapper(keyEncryptionAlgorithm, recipientKey, ANONYMOUS_SENDER, partyVInfo);
try
{
Key key = helper.getJceKey(encryptedKeyAlgorithm.getAlgorithm(), unwrapper.generateUnwrappedKey(encryptedKeyAlgorithm, encryptedEncryptionKey));
if (validateKeySize)
{
helper.keySizeCheck(encryptedKeyAlgorithm, key);
}
return key;
}
catch (OperatorException e)
{
throw new CMSException("exception unwrapping key: " + e.getMessage(), e);
}
}
protected static byte[] getPartyVInfoFromRID(KeyTransRecipientId recipientId)
throws IOException
{
if (recipientId.getSerialNumber() != null)
{
return new IssuerAndSerialNumber(recipientId.getIssuer(), recipientId.getSerialNumber()).getEncoded(ASN1Encoding.DER);
}
else
{
return new DEROctetString(recipientId.getSubjectKeyIdentifier()).getEncoded();
}
}
}