BaseSecretKeyFactory.java revision a198e1ecc615e26a167d0f2dca9fa7e5fc62de10 
1package org.bouncycastle.jcajce.provider.symmetric.util;
2
3import java.lang.reflect.Constructor;
4import java.security.InvalidKeyException;
5import java.security.spec.InvalidKeySpecException;
6import java.security.spec.KeySpec;
7
8import javax.crypto.SecretKey;
9import javax.crypto.SecretKeyFactorySpi;
10import javax.crypto.spec.SecretKeySpec;
11
12import org.bouncycastle.asn1.ASN1ObjectIdentifier;
13
14public class BaseSecretKeyFactory
15    extends SecretKeyFactorySpi
16    implements PBE
17{
18    protected String                algName;
19    protected ASN1ObjectIdentifier   algOid;
20
21    protected BaseSecretKeyFactory(
22        String algName,
23        ASN1ObjectIdentifier algOid)
24    {
25        this.algName = algName;
26        this.algOid = algOid;
27    }
28
29    protected SecretKey engineGenerateSecret(
30        KeySpec keySpec)
31    throws InvalidKeySpecException
32    {
33        if (keySpec instanceof SecretKeySpec)
34        {
35            return (SecretKey)keySpec;
36        }
37
38        throw new InvalidKeySpecException("Invalid KeySpec");
39    }
40
41    protected KeySpec engineGetKeySpec(
42        SecretKey key,
43        Class keySpec)
44    throws InvalidKeySpecException
45    {
46        if (keySpec == null)
47        {
48            throw new InvalidKeySpecException("keySpec parameter is null");
49        }
50        if (key == null)
51        {
52            throw new InvalidKeySpecException("key parameter is null");
53        }
54
55        if (SecretKeySpec.class.isAssignableFrom(keySpec))
56        {
57            return new SecretKeySpec(key.getEncoded(), algName);
58        }
59
60        try
61        {
62            Class[] parameters = { byte[].class };
63
64            Constructor c = keySpec.getConstructor(parameters);
65            Object[]    p = new Object[1];
66
67            p[0] = key.getEncoded();
68
69            return (KeySpec)c.newInstance(p);
70        }
71        catch (Exception e)
72        {
73            throw new InvalidKeySpecException(e.toString());
74        }
75    }
76
77    protected SecretKey engineTranslateKey(
78        SecretKey key)
79    throws InvalidKeyException
80    {
81        if (key == null)
82        {
83            throw new InvalidKeyException("key parameter is null");
84        }
85
86        if (!key.getAlgorithm().equalsIgnoreCase(algName))
87        {
88            throw new InvalidKeyException("Key not of type " + algName + ".");
89        }
90
91        return new SecretKeySpec(key.getEncoded(), algName);
92    }
93}
94