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package org.spongycastle.cms.jcajce;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import javax.crypto.KeyAgreement;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.cms.ecc.MQVuserKeyingMaterial;
import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.cms.CMSEnvelopedGenerator;
import org.spongycastle.cms.CMSException;
import org.spongycastle.cms.KeyAgreeRecipient;
import org.spongycastle.jce.spec.MQVPrivateKeySpec;
import org.spongycastle.jce.spec.MQVPublicKeySpec;
public abstract class JceKeyAgreeRecipient
implements KeyAgreeRecipient
{
private PrivateKey recipientKey;
protected EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
protected EnvelopedDataHelper contentHelper = helper;
public JceKeyAgreeRecipient(PrivateKey recipientKey)
{
this.recipientKey = recipientKey;
}
/**
* Set the provider to use for key recovery and content processing.
*
* @param provider provider to use.
* @return this recipient.
*/
public JceKeyAgreeRecipient 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 JceKeyAgreeRecipient setProvider(String providerName)
{
this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));
this.contentHelper = helper;
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 JceKeyAgreeRecipient 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 JceKeyAgreeRecipient setContentProvider(String providerName)
{
this.contentHelper = CMSUtils.createContentHelper(providerName);
return this;
}
private SecretKey calculateAgreedWrapKey(AlgorithmIdentifier keyEncAlg, ASN1ObjectIdentifier wrapAlg,
PublicKey senderPublicKey, ASN1OctetString userKeyingMaterial, PrivateKey receiverPrivateKey)
throws CMSException, GeneralSecurityException, IOException, InvalidKeyException, NoSuchAlgorithmException
{
String agreeAlg = keyEncAlg.getAlgorithm().getId();
if (agreeAlg.equals(CMSEnvelopedGenerator.ECMQV_SHA1KDF))
{
byte[] ukmEncoding = userKeyingMaterial.getOctets();
MQVuserKeyingMaterial ukm = MQVuserKeyingMaterial.getInstance(
ASN1Primitive.fromByteArray(ukmEncoding));
SubjectPublicKeyInfo pubInfo = new SubjectPublicKeyInfo(
getPrivateKeyAlgorithmIdentifier(),
ukm.getEphemeralPublicKey().getPublicKey().getBytes());
X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(pubInfo.getEncoded());
KeyFactory fact = helper.createKeyFactory(keyEncAlg.getAlgorithm());
PublicKey ephemeralKey = fact.generatePublic(pubSpec);
senderPublicKey = new MQVPublicKeySpec(senderPublicKey, ephemeralKey);
receiverPrivateKey = new MQVPrivateKeySpec(receiverPrivateKey, receiverPrivateKey);
}
KeyAgreement agreement = helper.createKeyAgreement(keyEncAlg.getAlgorithm());
agreement.init(receiverPrivateKey);
agreement.doPhase(senderPublicKey, true);
return agreement.generateSecret(wrapAlg.getId());
}
private Key unwrapSessionKey(ASN1ObjectIdentifier wrapAlg, SecretKey agreedKey, ASN1ObjectIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
throws CMSException, InvalidKeyException, NoSuchAlgorithmException
{
Cipher keyCipher = helper.createCipher(wrapAlg);
keyCipher.init(Cipher.UNWRAP_MODE, agreedKey);
return keyCipher.unwrap(encryptedContentEncryptionKey, helper.getBaseCipherName(contentEncryptionAlgorithm), Cipher.SECRET_KEY);
}
protected Key extractSecretKey(AlgorithmIdentifier keyEncryptionAlgorithm, AlgorithmIdentifier contentEncryptionAlgorithm, SubjectPublicKeyInfo senderKey, ASN1OctetString userKeyingMaterial, byte[] encryptedContentEncryptionKey)
throws CMSException
{
try
{
ASN1ObjectIdentifier wrapAlg =
AlgorithmIdentifier.getInstance(keyEncryptionAlgorithm.getParameters()).getAlgorithm();
X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(senderKey.getEncoded());
KeyFactory fact = helper.createKeyFactory(keyEncryptionAlgorithm.getAlgorithm());
PublicKey senderPublicKey = fact.generatePublic(pubSpec);
SecretKey agreedWrapKey = calculateAgreedWrapKey(keyEncryptionAlgorithm, wrapAlg,
senderPublicKey, userKeyingMaterial, recipientKey);
return unwrapSessionKey(wrapAlg, agreedWrapKey, contentEncryptionAlgorithm.getAlgorithm(), encryptedContentEncryptionKey);
}
catch (NoSuchAlgorithmException e)
{
throw new CMSException("can't find algorithm.", e);
}
catch (InvalidKeyException e)
{
throw new CMSException("key invalid in message.", e);
}
catch (InvalidKeySpecException e)
{
throw new CMSException("originator key spec invalid.", e);
}
catch (NoSuchPaddingException e)
{
throw new CMSException("required padding not supported.", e);
}
catch (Exception e)
{
throw new CMSException("originator key invalid.", e);
}
}
public AlgorithmIdentifier getPrivateKeyAlgorithmIdentifier()
{
return PrivateKeyInfo.getInstance(recipientKey.getEncoded()).getAlgorithmId();
}
}
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