1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
package org.spongycastle.operator.jcajce;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.ProviderException;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.SecretKeySpec;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.operator.AsymmetricKeyUnwrapper;
import org.spongycastle.operator.GenericKey;
import org.spongycastle.operator.OperatorException;
public class JceAsymmetricKeyUnwrapper
extends AsymmetricKeyUnwrapper
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private Map extraMappings = new HashMap();
private PrivateKey privKey;
public JceAsymmetricKeyUnwrapper(AlgorithmIdentifier algorithmIdentifier, PrivateKey privKey)
{
super(algorithmIdentifier);
this.privKey = privKey;
}
public JceAsymmetricKeyUnwrapper setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JceAsymmetricKeyUnwrapper setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
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.
* <p>
* For example:
* <pre>
* unwrapper.setAlgorithmMapping(PKCSObjectIdentifiers.rsaEncryption, "RSA");
* </pre>
* </p>
* @param algorithm OID of algorithm in recipient.
* @param algorithmName JCE algorithm name to use.
* @return the current Unwrapper.
*/
public JceAsymmetricKeyUnwrapper setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
{
extraMappings.put(algorithm, algorithmName);
return this;
}
public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
throws OperatorException
{
try
{
Key sKey = null;
Cipher keyCipher = helper.createAsymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm(), extraMappings);
try
{
keyCipher.init(Cipher.UNWRAP_MODE, privKey);
sKey = keyCipher.unwrap(encryptedKey, helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()), Cipher.SECRET_KEY);
}
catch (NoSuchAlgorithmException e)
{
}
catch (InvalidKeyException e)
{
}
catch (IllegalStateException e)
{
}
catch (UnsupportedOperationException e)
{
}
catch (ProviderException e)
{
}
// some providers do not support UNWRAP (this appears to be only for asymmetric algorithms)
if (sKey == null)
{
keyCipher.init(Cipher.DECRYPT_MODE, privKey);
sKey = new SecretKeySpec(keyCipher.doFinal(encryptedKey), encryptedKeyAlgorithm.getAlgorithm().getId());
}
return new GenericKey(sKey);
}
catch (InvalidKeyException e)
{
throw new OperatorException("key invalid: " + e.getMessage(), e);
}
catch (IllegalBlockSizeException e)
{
throw new OperatorException("illegal blocksize: " + e.getMessage(), e);
}
catch (BadPaddingException e)
{
throw new OperatorException("bad padding: " + e.getMessage(), e);
}
}
}
|
