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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
package org.bouncycastle.jcajce.provider.asymmetric.util;
import java.security.AlgorithmParameters;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherSpi;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
// BEGIN android-removed
// import javax.crypto.spec.RC2ParameterSpec;
// import javax.crypto.spec.RC5ParameterSpec;
// END android-removed
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public abstract class BaseCipherSpi
extends CipherSpi
{
//
// specs we can handle.
//
private Class[] availableSpecs =
{
IvParameterSpec.class,
PBEParameterSpec.class,
// BEGIN android-removed
// RC2ParameterSpec.class,
// RC5ParameterSpec.class
// END android-removed
};
protected AlgorithmParameters engineParams = null;
protected Wrapper wrapEngine = null;
private int ivSize;
private byte[] iv;
protected BaseCipherSpi()
{
}
protected int engineGetBlockSize()
{
return 0;
}
protected byte[] engineGetIV()
{
return null;
}
protected int engineGetKeySize(
Key key)
{
return key.getEncoded().length;
}
protected int engineGetOutputSize(
int inputLen)
{
return -1;
}
protected AlgorithmParameters engineGetParameters()
{
return null;
}
protected void engineSetMode(
String mode)
throws NoSuchAlgorithmException
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
protected void engineSetPadding(
String padding)
throws NoSuchPaddingException
{
throw new NoSuchPaddingException("Padding " + padding + " unknown.");
}
protected byte[] engineWrap(
Key key)
throws IllegalBlockSizeException, InvalidKeyException
{
byte[] encoded = key.getEncoded();
if (encoded == null)
{
throw new InvalidKeyException("Cannot wrap key, null encoding.");
}
try
{
if (wrapEngine == null)
{
return engineDoFinal(encoded, 0, encoded.length);
}
else
{
return wrapEngine.wrap(encoded, 0, encoded.length);
}
}
catch (BadPaddingException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
}
protected Key engineUnwrap(
byte[] wrappedKey,
String wrappedKeyAlgorithm,
int wrappedKeyType)
throws InvalidKeyException
{
byte[] encoded;
try
{
if (wrapEngine == null)
{
encoded = engineDoFinal(wrappedKey, 0, wrappedKey.length);
}
else
{
encoded = wrapEngine.unwrap(wrappedKey, 0, wrappedKey.length);
}
}
catch (InvalidCipherTextException e)
{
throw new InvalidKeyException(e.getMessage());
}
catch (BadPaddingException e)
{
throw new InvalidKeyException(e.getMessage());
}
catch (IllegalBlockSizeException e2)
{
throw new InvalidKeyException(e2.getMessage());
}
if (wrappedKeyType == Cipher.SECRET_KEY)
{
return new SecretKeySpec(encoded, wrappedKeyAlgorithm);
}
else if (wrappedKeyAlgorithm.equals("") && wrappedKeyType == Cipher.PRIVATE_KEY)
{
/*
* The caller doesn't know the algorithm as it is part of
* the encrypted data.
*/
try
{
PrivateKeyInfo in = PrivateKeyInfo.getInstance(encoded);
PrivateKey privKey = BouncyCastleProvider.getPrivateKey(in);
if (privKey != null)
{
return privKey;
}
else
{
throw new InvalidKeyException("algorithm " + in.getPrivateKeyAlgorithm().getAlgorithm() + " not supported");
}
}
catch (Exception e)
{
throw new InvalidKeyException("Invalid key encoding.");
}
}
else
{
try
{
KeyFactory kf = KeyFactory.getInstance(wrappedKeyAlgorithm, BouncyCastleProvider.PROVIDER_NAME);
if (wrappedKeyType == Cipher.PUBLIC_KEY)
{
return kf.generatePublic(new X509EncodedKeySpec(encoded));
}
else if (wrappedKeyType == Cipher.PRIVATE_KEY)
{
return kf.generatePrivate(new PKCS8EncodedKeySpec(encoded));
}
}
catch (NoSuchProviderException e)
{
throw new InvalidKeyException("Unknown key type " + e.getMessage());
}
catch (NoSuchAlgorithmException e)
{
throw new InvalidKeyException("Unknown key type " + e.getMessage());
}
catch (InvalidKeySpecException e2)
{
throw new InvalidKeyException("Unknown key type " + e2.getMessage());
}
throw new InvalidKeyException("Unknown key type " + wrappedKeyType);
}
}
}
|
