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package org.bouncycastle.jcajce.provider.symmetric.util;
import java.lang.reflect.Constructor;
import java.security.InvalidKeyException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.params.DESParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
public class BaseSecretKeyFactory
extends SecretKeyFactorySpi
implements PBE
{
protected String algName;
protected ASN1ObjectIdentifier algOid;
protected BaseSecretKeyFactory(
String algName,
ASN1ObjectIdentifier algOid)
{
this.algName = algName;
this.algOid = algOid;
}
protected SecretKey engineGenerateSecret(
KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof SecretKeySpec)
{
return (SecretKey)keySpec;
}
throw new InvalidKeySpecException("Invalid KeySpec");
}
protected KeySpec engineGetKeySpec(
SecretKey key,
Class keySpec)
throws InvalidKeySpecException
{
if (keySpec == null)
{
throw new InvalidKeySpecException("keySpec parameter is null");
}
if (key == null)
{
throw new InvalidKeySpecException("key parameter is null");
}
if (SecretKeySpec.class.isAssignableFrom(keySpec))
{
return new SecretKeySpec(key.getEncoded(), algName);
}
try
{
Class[] parameters = { byte[].class };
Constructor c = keySpec.getConstructor(parameters);
Object[] p = new Object[1];
p[0] = key.getEncoded();
return (KeySpec)c.newInstance(p);
}
catch (Exception e)
{
throw new InvalidKeySpecException(e.toString());
}
}
protected SecretKey engineTranslateKey(
SecretKey key)
throws InvalidKeyException
{
if (key == null)
{
throw new InvalidKeyException("key parameter is null");
}
if (!key.getAlgorithm().equalsIgnoreCase(algName))
{
throw new InvalidKeyException("Key not of type " + algName + ".");
}
return new SecretKeySpec(key.getEncoded(), algName);
}
/*
* classes that inherit from us
*/
static public class DESPBEKeyFactory
extends BaseSecretKeyFactory
{
private boolean forCipher;
private int scheme;
private int digest;
private int keySize;
private int ivSize;
public DESPBEKeyFactory(
String algorithm,
ASN1ObjectIdentifier oid,
boolean forCipher,
int scheme,
int digest,
int keySize,
int ivSize)
{
super(algorithm, oid);
this.forCipher = forCipher;
this.scheme = scheme;
this.digest = digest;
this.keySize = keySize;
this.ivSize = ivSize;
}
protected SecretKey engineGenerateSecret(
KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof PBEKeySpec)
{
PBEKeySpec pbeSpec = (PBEKeySpec)keySpec;
CipherParameters param;
if (pbeSpec.getSalt() == null)
{
return new BCPBEKey(this.algName, this.algOid, scheme, digest, keySize, ivSize, pbeSpec, null);
}
if (forCipher)
{
param = PBE.Util.makePBEParameters(pbeSpec, scheme, digest, keySize, ivSize);
}
else
{
param = PBE.Util.makePBEMacParameters(pbeSpec, scheme, digest, keySize);
}
KeyParameter kParam;
if (param instanceof ParametersWithIV)
{
kParam = (KeyParameter)((ParametersWithIV)param).getParameters();
}
else
{
kParam = (KeyParameter)param;
}
DESParameters.setOddParity(kParam.getKey());
return new BCPBEKey(this.algName, this.algOid, scheme, digest, keySize, ivSize, pbeSpec, param);
}
throw new InvalidKeySpecException("Invalid KeySpec");
}
}
static public class DES
extends BaseSecretKeyFactory
{
public DES()
{
super("DES", null);
}
protected SecretKey engineGenerateSecret(
KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof DESKeySpec)
{
DESKeySpec desKeySpec = (DESKeySpec)keySpec;
return new SecretKeySpec(desKeySpec.getKey(), "DES");
}
return super.engineGenerateSecret(keySpec);
}
}
}
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