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
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
|
/*
* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2010 Thialfihar <thi@thialfihar.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.sufficientlysecure.keychain.pgp;
import android.content.Context;
import org.spongycastle.bcpg.CompressionAlgorithmTags;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.SymmetricKeyAlgorithmTags;
import org.spongycastle.bcpg.sig.KeyFlags;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.jce.spec.ElGamalParameterSpec;
import org.spongycastle.openpgp.*;
import org.spongycastle.openpgp.PGPUtil;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.PBESecretKeyEncryptor;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PGPDigestCalculator;
import org.spongycastle.openpgp.operator.jcajce.*;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.Id;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.util.IterableIterator;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.Primes;
import org.sufficientlysecure.keychain.util.ProgressDialogUpdater;
import java.io.IOException;
import java.math.BigInteger;
import java.security.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Iterator;
import java.util.List;
import java.util.TimeZone;
public class PgpKeyOperation {
private Context mContext;
private ProgressDialogUpdater mProgress;
private static final int[] PREFERRED_SYMMETRIC_ALGORITHMS = new int[]{
SymmetricKeyAlgorithmTags.AES_256, SymmetricKeyAlgorithmTags.AES_192,
SymmetricKeyAlgorithmTags.AES_128, SymmetricKeyAlgorithmTags.CAST5,
SymmetricKeyAlgorithmTags.TRIPLE_DES};
private static final int[] PREFERRED_HASH_ALGORITHMS = new int[]{HashAlgorithmTags.SHA1,
HashAlgorithmTags.SHA256, HashAlgorithmTags.RIPEMD160};
private static final int[] PREFERRED_COMPRESSION_ALGORITHMS = new int[]{
CompressionAlgorithmTags.ZLIB, CompressionAlgorithmTags.BZIP2,
CompressionAlgorithmTags.ZIP};
public PgpKeyOperation(Context context, ProgressDialogUpdater progress) {
super();
this.mContext = context;
this.mProgress = progress;
}
public void updateProgress(int message, int current, int total) {
if (mProgress != null) {
mProgress.setProgress(message, current, total);
}
}
public void updateProgress(int current, int total) {
if (mProgress != null) {
mProgress.setProgress(current, total);
}
}
/**
* Creates new secret key.
*
* @param algorithmChoice
* @param keySize
* @param passphrase
* @param isMasterKey
* @return
* @throws NoSuchAlgorithmException
* @throws PGPException
* @throws NoSuchProviderException
* @throws PgpGeneralException
* @throws InvalidAlgorithmParameterException
*/
// TODO: key flags?
public PGPSecretKey createKey(int algorithmChoice, int keySize, String passphrase,
boolean isMasterKey)
throws NoSuchAlgorithmException, PGPException, NoSuchProviderException,
PgpGeneralException, InvalidAlgorithmParameterException {
if (keySize < 512) {
throw new PgpGeneralException(mContext.getString(R.string.error_key_size_minimum512bit));
}
if (passphrase == null) {
passphrase = "";
}
int algorithm = 0;
KeyPairGenerator keyGen = null;
switch (algorithmChoice) {
case Id.choice.algorithm.dsa: {
keyGen = KeyPairGenerator.getInstance("DSA", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
keyGen.initialize(keySize, new SecureRandom());
algorithm = PGPPublicKey.DSA;
break;
}
case Id.choice.algorithm.elgamal: {
if (isMasterKey) {
throw new PgpGeneralException(
mContext.getString(R.string.error_master_key_must_not_be_el_gamal));
}
keyGen = KeyPairGenerator.getInstance("ElGamal", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
BigInteger p = Primes.getBestPrime(keySize);
BigInteger g = new BigInteger("2");
ElGamalParameterSpec elParams = new ElGamalParameterSpec(p, g);
keyGen.initialize(elParams);
algorithm = PGPPublicKey.ELGAMAL_ENCRYPT;
break;
}
case Id.choice.algorithm.rsa: {
keyGen = KeyPairGenerator.getInstance("RSA", Constants.BOUNCY_CASTLE_PROVIDER_NAME);
keyGen.initialize(keySize, new SecureRandom());
algorithm = PGPPublicKey.RSA_GENERAL;
break;
}
default: {
throw new PgpGeneralException(
mContext.getString(R.string.error_unknown_algorithm_choice));
}
}
// build new key pair
PGPKeyPair keyPair = new JcaPGPKeyPair(algorithm, keyGen.generateKeyPair(), new Date());
// define hashing and signing algos
PGPDigestCalculator sha1Calc = new JcaPGPDigestCalculatorProviderBuilder().build().get(
HashAlgorithmTags.SHA1);
// Build key encrypter and decrypter based on passphrase
PBESecretKeyEncryptor keyEncryptor = new JcePBESecretKeyEncryptorBuilder(
PGPEncryptedData.CAST5, sha1Calc)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
PGPSecretKey secKey = new PGPSecretKey(keyPair.getPrivateKey(), keyPair.getPublicKey(),
sha1Calc, isMasterKey, keyEncryptor);
return secKey;
}
public void changeSecretKeyPassphrase(PGPSecretKeyRing keyRing, String oldPassPhrase,
String newPassPhrase) throws IOException, PGPException,
NoSuchProviderException {
updateProgress(R.string.progress_building_key, 0, 100);
if (oldPassPhrase == null) {
oldPassPhrase = "";
}
if (newPassPhrase == null) {
newPassPhrase = "";
}
PGPSecretKeyRing newKeyRing = PGPSecretKeyRing.copyWithNewPassword(
keyRing,
new JcePBESecretKeyDecryptorBuilder(new JcaPGPDigestCalculatorProviderBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build()).setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(oldPassPhrase.toCharArray()),
new JcePBESecretKeyEncryptorBuilder(keyRing.getSecretKey()
.getKeyEncryptionAlgorithm()).build(newPassPhrase.toCharArray()));
updateProgress(R.string.progress_saving_key_ring, 50, 100);
ProviderHelper.saveKeyRing(mContext, newKeyRing);
updateProgress(R.string.progress_done, 100, 100);
}
public void buildSecretKey(ArrayList<String> userIds, ArrayList<PGPSecretKey> keys,
ArrayList<Integer> keysUsages, ArrayList<GregorianCalendar> keysExpiryDates,
PGPPublicKey oldPublicKey, String oldPassPhrase,
String newPassPhrase) throws PgpGeneralException, NoSuchProviderException,
PGPException, NoSuchAlgorithmException, SignatureException, IOException {
Log.d(Constants.TAG, "userIds: " + userIds.toString());
updateProgress(R.string.progress_building_key, 0, 100);
if (oldPassPhrase == null) {
oldPassPhrase = "";
}
if (newPassPhrase == null) {
newPassPhrase = "";
}
updateProgress(R.string.progress_preparing_master_key, 10, 100);
// prepare keyring generator with given master public and secret key
PGPKeyRingGenerator keyGen;
PGPPublicKey masterPublicKey; {
String mainUserId = userIds.get(0);
// prepare the master key pair
PGPKeyPair masterKeyPair; {
PGPSecretKey masterKey = keys.get(0);
// this removes all userIds and certifications previously attached to the masterPublicKey
PGPPublicKey tmpKey = masterKey.getPublicKey();
masterPublicKey = new PGPPublicKey(tmpKey.getAlgorithm(),
tmpKey.getKey(new BouncyCastleProvider()), tmpKey.getCreationTime());
// already done by code above:
// PGPPublicKey masterPublicKey = masterKey.getPublicKey();
// // Somehow, the PGPPublicKey already has an empty certification attached to it when the
// // keyRing is generated the first time, we remove that when it exists, before adding the
// new
// // ones
// PGPPublicKey masterPublicKeyRmCert = PGPPublicKey.removeCertification(masterPublicKey,
// "");
// if (masterPublicKeyRmCert != null) {
// masterPublicKey = masterPublicKeyRmCert;
// }
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(oldPassPhrase.toCharArray());
PGPPrivateKey masterPrivateKey = masterKey.extractPrivateKey(keyDecryptor);
updateProgress(R.string.progress_certifying_master_key, 20, 100);
// re-add old certificates, or create new ones for new uids
for (String userId : userIds) {
// re-add certs for this uid, take a note if self-signed cert is in there
boolean foundSelfSign = false;
Iterator<PGPSignature> it = tmpKey.getSignaturesForID(userId);
if(it != null) for(PGPSignature sig : new IterableIterator<PGPSignature>(it)) {
if(sig.getKeyID() == masterPublicKey.getKeyID()) {
// already have a self sign? skip this other one, then.
// note: PGPKeyRingGenerator adds one cert for the main user id, which
// will lead to duplicates. unfortunately, if we add any other here
// first, that will change the main user id order...
if(foundSelfSign)
continue;
foundSelfSign = true;
}
Log.d(Constants.TAG, "adding old sig for " + userId + " from "
+ PgpKeyHelper.convertKeyIdToHex(sig.getKeyID()));
masterPublicKey = PGPPublicKey.addCertification(masterPublicKey, userId, sig);
}
// there was an old self-signed certificate for this uid
if(foundSelfSign)
continue;
Log.d(Constants.TAG, "generating self-signed cert for " + userId);
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
masterPublicKey.getAlgorithm(), HashAlgorithmTags.SHA1)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
sGen.init(PGPSignature.POSITIVE_CERTIFICATION, masterPrivateKey);
PGPSignature certification = sGen.generateCertification(userId, masterPublicKey);
masterPublicKey = PGPPublicKey.addCertification(masterPublicKey, userId, certification);
}
masterKeyPair = new PGPKeyPair(masterPublicKey, masterPrivateKey);
}
PGPSignatureSubpacketGenerator hashedPacketsGen;
PGPSignatureSubpacketGenerator unhashedPacketsGen; {
hashedPacketsGen = new PGPSignatureSubpacketGenerator();
unhashedPacketsGen = new PGPSignatureSubpacketGenerator();
int usageId = keysUsages.get(0);
boolean canEncrypt =
(usageId == Id.choice.usage.encrypt_only || usageId == Id.choice.usage.sign_and_encrypt);
int keyFlags = KeyFlags.CERTIFY_OTHER | KeyFlags.SIGN_DATA;
if (canEncrypt) {
keyFlags |= KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE;
}
hashedPacketsGen.setKeyFlags(true, keyFlags);
hashedPacketsGen.setPreferredSymmetricAlgorithms(true, PREFERRED_SYMMETRIC_ALGORITHMS);
hashedPacketsGen.setPreferredHashAlgorithms(true, PREFERRED_HASH_ALGORITHMS);
hashedPacketsGen.setPreferredCompressionAlgorithms(true, PREFERRED_COMPRESSION_ALGORITHMS);
if (keysExpiryDates.get(0) != null) {
GregorianCalendar creationDate = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
creationDate.setTime(masterPublicKey.getCreationTime());
GregorianCalendar expiryDate = keysExpiryDates.get(0);
//note that the below, (a/c) - (b/c) is *not* the same as (a - b) /c
//here we purposefully ignore partial days in each date - long type has no fractional part!
long numDays =
(expiryDate.getTimeInMillis() / 86400000) - (creationDate.getTimeInMillis() / 86400000);
if (numDays <= 0) {
throw new PgpGeneralException(
mContext.getString(R.string.error_expiry_must_come_after_creation));
}
hashedPacketsGen.setKeyExpirationTime(false, numDays * 86400);
} else {
//do this explicitly, although since we're rebuilding,
hashedPacketsGen.setKeyExpirationTime(false, 0);
//this happens anyway
}
}
updateProgress(R.string.progress_building_master_key, 30, 100);
// define hashing and signing algos
PGPDigestCalculator sha1Calc = new JcaPGPDigestCalculatorProviderBuilder().build().get(
HashAlgorithmTags.SHA1);
PGPContentSignerBuilder certificationSignerBuilder = new JcaPGPContentSignerBuilder(
masterKeyPair.getPublicKey().getAlgorithm(), HashAlgorithmTags.SHA1);
// Build key encrypter based on passphrase
PBESecretKeyEncryptor keyEncryptor = new JcePBESecretKeyEncryptorBuilder(
PGPEncryptedData.CAST5, sha1Calc)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(
newPassPhrase.toCharArray());
keyGen = new PGPKeyRingGenerator(PGPSignature.POSITIVE_CERTIFICATION,
masterKeyPair, mainUserId, sha1Calc, hashedPacketsGen.generate(),
unhashedPacketsGen.generate(), certificationSignerBuilder, keyEncryptor);
}
updateProgress(R.string.progress_adding_sub_keys, 40, 100);
for (int i = 1; i < keys.size(); ++i) {
updateProgress(40 + 40 * (i - 1) / (keys.size() - 1), 100);
PGPSecretKey subKey = keys.get(i);
PGPPublicKey subPublicKey = subKey.getPublicKey();
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(
oldPassPhrase.toCharArray());
PGPPrivateKey subPrivateKey = subKey.extractPrivateKey(keyDecryptor);
// TODO: now used without algorithm and creation time?! (APG 1)
PGPKeyPair subKeyPair = new PGPKeyPair(subPublicKey, subPrivateKey);
PGPSignatureSubpacketGenerator hashedPacketsGen = new PGPSignatureSubpacketGenerator();
PGPSignatureSubpacketGenerator unhashedPacketsGen = new PGPSignatureSubpacketGenerator();
int keyFlags = 0;
int usageId = keysUsages.get(i);
boolean canSign =
(usageId == Id.choice.usage.sign_only || usageId == Id.choice.usage.sign_and_encrypt);
boolean canEncrypt =
(usageId == Id.choice.usage.encrypt_only || usageId == Id.choice.usage.sign_and_encrypt);
if (canSign) {
Date todayDate = new Date(); //both sig times the same
keyFlags |= KeyFlags.SIGN_DATA;
// cross-certify signing keys
hashedPacketsGen.setSignatureCreationTime(false, todayDate); //set outer creation time
PGPSignatureSubpacketGenerator subHashedPacketsGen = new PGPSignatureSubpacketGenerator();
subHashedPacketsGen.setSignatureCreationTime(false, todayDate); //set inner creation time
PGPContentSignerBuilder signerBuilder = new JcaPGPContentSignerBuilder(
subPublicKey.getAlgorithm(), PGPUtil.SHA1)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
PGPSignatureGenerator sGen = new PGPSignatureGenerator(signerBuilder);
sGen.init(PGPSignature.PRIMARYKEY_BINDING, subPrivateKey);
sGen.setHashedSubpackets(subHashedPacketsGen.generate());
PGPSignature certification = sGen.generateCertification(masterPublicKey,
subPublicKey);
unhashedPacketsGen.setEmbeddedSignature(false, certification);
}
if (canEncrypt) {
keyFlags |= KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE;
}
hashedPacketsGen.setKeyFlags(false, keyFlags);
if (keysExpiryDates.get(i) != null) {
GregorianCalendar creationDate = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
creationDate.setTime(subPublicKey.getCreationTime());
GregorianCalendar expiryDate = keysExpiryDates.get(i);
//note that the below, (a/c) - (b/c) is *not* the same as (a - b) /c
//here we purposefully ignore partial days in each date - long type has no fractional part!
long numDays =
(expiryDate.getTimeInMillis() / 86400000) - (creationDate.getTimeInMillis() / 86400000);
if (numDays <= 0) {
throw new PgpGeneralException
(mContext.getString(R.string.error_expiry_must_come_after_creation));
}
hashedPacketsGen.setKeyExpirationTime(false, numDays * 86400);
} else {
//do this explicitly, although since we're rebuilding,
hashedPacketsGen.setKeyExpirationTime(false, 0);
//this happens anyway
}
keyGen.addSubKey(subKeyPair, hashedPacketsGen.generate(), unhashedPacketsGen.generate());
}
PGPSecretKeyRing secretKeyRing = keyGen.generateSecretKeyRing();
PGPPublicKeyRing publicKeyRing = keyGen.generatePublicKeyRing();
updateProgress(R.string.progress_re_adding_certs, 80, 100);
// re-add certificates from old public key
// TODO: this only takes care of user id certificates, what about others?
PGPPublicKey pubkey = publicKeyRing.getPublicKey();
for(String uid : new IterableIterator<String>(pubkey.getUserIDs())) {
for(PGPSignature sig : new IterableIterator<PGPSignature>(oldPublicKey.getSignaturesForID(uid))) {
// but skip self certificates
if(sig.getKeyID() == pubkey.getKeyID())
continue;
pubkey = PGPPublicKey.addCertification(pubkey, uid, sig);
}
}
publicKeyRing = PGPPublicKeyRing.insertPublicKey(publicKeyRing, pubkey);
updateProgress(R.string.progress_saving_key_ring, 90, 100);
/* additional handy debug info
Log.d(Constants.TAG, " ------- in private key -------");
for(String uid : new IterableIterator<String>(secretKeyRing.getPublicKey().getUserIDs())) {
for(PGPSignature sig : new IterableIterator<PGPSignature>(secretKeyRing.getPublicKey().getSignaturesForID(uid))) {
Log.d(Constants.TAG, "sig: " + PgpKeyHelper.convertKeyIdToHex(sig.getKeyID()) + " for " + uid);
}
}
Log.d(Constants.TAG, " ------- in public key -------");
for(String uid : new IterableIterator<String>(publicKeyRing.getPublicKey().getUserIDs())) {
for(PGPSignature sig : new IterableIterator<PGPSignature>(publicKeyRing.getPublicKey().getSignaturesForID(uid))) {
Log.d(Constants.TAG, "sig: " + PgpKeyHelper.convertKeyIdToHex(sig.getKeyID()) + " for " + uid);
}
}
*/
ProviderHelper.saveKeyRing(mContext, secretKeyRing);
ProviderHelper.saveKeyRing(mContext, publicKeyRing);
updateProgress(R.string.progress_done, 100, 100);
}
/**
* Certify the given pubkeyid with the given masterkeyid.
*
* @param masterKeyId Certifying key, must be available as secret key
* @param pubKeyId ID of public key to certify
* @param userIds User IDs to certify, must not be null or empty
* @param passphrase Passphrase of the secret key
* @return A keyring with added certifications
*/
public PGPPublicKeyRing certifyKey(long masterKeyId, long pubKeyId, List<String> userIds, String passphrase)
throws PgpGeneralException, NoSuchAlgorithmException, NoSuchProviderException,
PGPException, SignatureException {
if (passphrase == null) {
throw new PgpGeneralException("Unable to obtain passphrase");
} else {
// create a signatureGenerator from the supplied masterKeyId and passphrase
PGPSignatureGenerator signatureGenerator; {
PGPSecretKey certificationKey = PgpKeyHelper.getCertificationKey(mContext, masterKeyId);
if (certificationKey == null) {
throw new PgpGeneralException(mContext.getString(R.string.error_signature_failed));
}
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(passphrase.toCharArray());
PGPPrivateKey signaturePrivateKey = certificationKey.extractPrivateKey(keyDecryptor);
if (signaturePrivateKey == null) {
throw new PgpGeneralException(
mContext.getString(R.string.error_could_not_extract_private_key));
}
// TODO: SHA256 fixed?
JcaPGPContentSignerBuilder contentSignerBuilder = new JcaPGPContentSignerBuilder(
certificationKey.getPublicKey().getAlgorithm(), PGPUtil.SHA256)
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
signatureGenerator = new PGPSignatureGenerator(contentSignerBuilder);
signatureGenerator.init(PGPSignature.DEFAULT_CERTIFICATION, signaturePrivateKey);
}
{ // supply signatureGenerator with a SubpacketVector
PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
PGPSignatureSubpacketVector packetVector = spGen.generate();
signatureGenerator.setHashedSubpackets(packetVector);
}
// fetch public key ring, add the certification and return it
PGPPublicKeyRing pubring = ProviderHelper
.getPGPPublicKeyRingByKeyId(mContext, pubKeyId);
PGPPublicKey signedKey = pubring.getPublicKey(pubKeyId);
for(String userId : new IterableIterator<String>(userIds.iterator())) {
PGPSignature sig = signatureGenerator.generateCertification(userId, signedKey);
signedKey = PGPPublicKey.addCertification(signedKey, userId, sig);
}
pubring = PGPPublicKeyRing.insertPublicKey(pubring, signedKey);
return pubring;
}
}
}
|