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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
|
package org.bouncycastle.cms;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Iterator;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.BERSequenceGenerator;
import org.bouncycastle.asn1.BERSet;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.cms.EnvelopedData;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OutputEncryptor;
/**
* General class for generating a CMS enveloped-data message stream.
* <p>
* A simple example of usage.
* <pre>
* CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();
*
* edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(recipientCert).setProvider("BC"));
*
* ByteArrayOutputStream bOut = new ByteArrayOutputStream();
*
* OutputStream out = edGen.open(
* bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.DES_EDE3_CBC)
* .setProvider("BC").build());
* out.write(data);
*
* out.close();
* </pre>
*/
public class CMSEnvelopedDataStreamGenerator
extends CMSEnvelopedGenerator
{
private ASN1Set _unprotectedAttributes = null;
private int _bufferSize;
private boolean _berEncodeRecipientSet;
/**
* base constructor
*/
public CMSEnvelopedDataStreamGenerator()
{
}
/**
* Set the underlying string size for encapsulated data
*
* @param bufferSize length of octet strings to buffer the data.
*/
public void setBufferSize(
int bufferSize)
{
_bufferSize = bufferSize;
}
/**
* Use a BER Set to store the recipient information
*/
public void setBEREncodeRecipients(
boolean berEncodeRecipientSet)
{
_berEncodeRecipientSet = berEncodeRecipientSet;
}
private ASN1Integer getVersion()
{
if (originatorInfo != null || _unprotectedAttributes != null)
{
return new ASN1Integer(2);
}
else
{
return new ASN1Integer(0);
}
}
private OutputStream doOpen(
ASN1ObjectIdentifier dataType,
OutputStream out,
OutputEncryptor encryptor)
throws IOException, CMSException
{
ASN1EncodableVector recipientInfos = new ASN1EncodableVector();
GenericKey encKey = encryptor.getKey();
Iterator it = recipientInfoGenerators.iterator();
while (it.hasNext())
{
RecipientInfoGenerator recipient = (RecipientInfoGenerator)it.next();
recipientInfos.add(recipient.generate(encKey));
}
return open(dataType, out, recipientInfos, encryptor);
}
protected OutputStream open(
ASN1ObjectIdentifier dataType,
OutputStream out,
ASN1EncodableVector recipientInfos,
OutputEncryptor encryptor)
throws IOException
{
//
// ContentInfo
//
BERSequenceGenerator cGen = new BERSequenceGenerator(out);
cGen.addObject(CMSObjectIdentifiers.envelopedData);
//
// Encrypted Data
//
BERSequenceGenerator envGen = new BERSequenceGenerator(cGen.getRawOutputStream(), 0, true);
envGen.addObject(getVersion());
if (originatorInfo != null)
{
envGen.addObject(new DERTaggedObject(false, 0, originatorInfo));
}
if (_berEncodeRecipientSet)
{
envGen.getRawOutputStream().write(new BERSet(recipientInfos).getEncoded());
}
else
{
envGen.getRawOutputStream().write(new DERSet(recipientInfos).getEncoded());
}
BERSequenceGenerator eiGen = new BERSequenceGenerator(envGen.getRawOutputStream());
eiGen.addObject(dataType);
AlgorithmIdentifier encAlgId = encryptor.getAlgorithmIdentifier();
eiGen.getRawOutputStream().write(encAlgId.getEncoded());
OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
eiGen.getRawOutputStream(), 0, false, _bufferSize);
OutputStream cOut = encryptor.getOutputStream(octetStream);
return new CmsEnvelopedDataOutputStream(cOut, cGen, envGen, eiGen);
}
protected OutputStream open(
OutputStream out,
ASN1EncodableVector recipientInfos,
OutputEncryptor encryptor)
throws CMSException
{
try
{
//
// ContentInfo
//
BERSequenceGenerator cGen = new BERSequenceGenerator(out);
cGen.addObject(CMSObjectIdentifiers.envelopedData);
//
// Encrypted Data
//
BERSequenceGenerator envGen = new BERSequenceGenerator(cGen.getRawOutputStream(), 0, true);
ASN1Set recipients;
if (_berEncodeRecipientSet)
{
recipients = new BERSet(recipientInfos);
}
else
{
recipients = new DERSet(recipientInfos);
}
envGen.addObject(new ASN1Integer(EnvelopedData.calculateVersion(originatorInfo, recipients, _unprotectedAttributes)));
if (originatorInfo != null)
{
envGen.addObject(new DERTaggedObject(false, 0, originatorInfo));
}
envGen.getRawOutputStream().write(recipients.getEncoded());
BERSequenceGenerator eiGen = new BERSequenceGenerator(envGen.getRawOutputStream());
eiGen.addObject(CMSObjectIdentifiers.data);
AlgorithmIdentifier encAlgId = encryptor.getAlgorithmIdentifier();
eiGen.getRawOutputStream().write(encAlgId.getEncoded());
OutputStream octetStream = CMSUtils.createBEROctetOutputStream(
eiGen.getRawOutputStream(), 0, false, _bufferSize);
return new CmsEnvelopedDataOutputStream(encryptor.getOutputStream(octetStream), cGen, envGen, eiGen);
}
catch (IOException e)
{
throw new CMSException("exception decoding algorithm parameters.", e);
}
}
/**
* generate an enveloped object that contains an CMS Enveloped Data
* object using the given encryptor.
*/
public OutputStream open(
OutputStream out,
OutputEncryptor encryptor)
throws CMSException, IOException
{
return doOpen(new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId()), out, encryptor);
}
/**
* generate an enveloped object that contains an CMS Enveloped Data
* object using the given encryptor and marking the data as being of the passed
* in type.
*/
public OutputStream open(
ASN1ObjectIdentifier dataType,
OutputStream out,
OutputEncryptor encryptor)
throws CMSException, IOException
{
return doOpen(dataType, out, encryptor);
}
private class CmsEnvelopedDataOutputStream
extends OutputStream
{
private OutputStream _out;
private BERSequenceGenerator _cGen;
private BERSequenceGenerator _envGen;
private BERSequenceGenerator _eiGen;
public CmsEnvelopedDataOutputStream(
OutputStream out,
BERSequenceGenerator cGen,
BERSequenceGenerator envGen,
BERSequenceGenerator eiGen)
{
_out = out;
_cGen = cGen;
_envGen = envGen;
_eiGen = eiGen;
}
public void write(
int b)
throws IOException
{
_out.write(b);
}
public void write(
byte[] bytes,
int off,
int len)
throws IOException
{
_out.write(bytes, off, len);
}
public void write(
byte[] bytes)
throws IOException
{
_out.write(bytes);
}
public void close()
throws IOException
{
_out.close();
_eiGen.close();
if (unprotectedAttributeGenerator != null)
{
AttributeTable attrTable = unprotectedAttributeGenerator.getAttributes(new HashMap());
ASN1Set unprotectedAttrs = new BERSet(attrTable.toASN1EncodableVector());
_envGen.addObject(new DERTaggedObject(false, 1, unprotectedAttrs));
}
_envGen.close();
_cGen.close();
}
}
}
|
