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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* CMS encryptedData methods.
*/
#include "cmslocal.h"
#include "keyhi.h"
#include "secasn1.h"
#include "secitem.h"
#include "secoid.h"
#include "pk11func.h"
#include "prtime.h"
#include "secerr.h"
#include "secpkcs5.h"
/*
* NSS_CMSEncryptedData_Create - create an empty encryptedData object.
*
* "algorithm" specifies the bulk encryption algorithm to use.
* "keysize" is the key size.
*
* An error results in a return value of NULL and an error set.
* (Retrieve specific errors via PORT_GetError()/XP_GetError().)
*/
NSSCMSEncryptedData *
NSS_CMSEncryptedData_Create(NSSCMSMessage *cmsg, SECOidTag algorithm,
int keysize)
{
void *mark;
NSSCMSEncryptedData *encd;
PLArenaPool *poolp;
SECAlgorithmID *pbe_algid;
SECStatus rv;
poolp = cmsg->poolp;
mark = PORT_ArenaMark(poolp);
encd = PORT_ArenaZNew(poolp, NSSCMSEncryptedData);
if (encd == NULL)
goto loser;
encd->cmsg = cmsg;
/* version is set in NSS_CMSEncryptedData_Encode_BeforeStart() */
if (!SEC_PKCS5IsAlgorithmPBEAlgTag(algorithm)) {
rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, &(encd->contentInfo),
algorithm, NULL, keysize);
} else {
/* Assume password-based-encryption.
* Note: we can't generate pkcs5v2 from this interface.
* PK11_CreateBPEAlgorithmID generates pkcs5v2 by accepting
* non-PBE oids and assuming that they are pkcs5v2 oids, but
* NSS_CMSEncryptedData_Create accepts non-PBE oids as regular
* CMS encrypted data, so we can't tell NSS_CMS_EncryptedData_Create
* to create pkcs5v2 PBEs */
pbe_algid = PK11_CreatePBEAlgorithmID(algorithm, 1, NULL);
if (pbe_algid == NULL) {
rv = SECFailure;
} else {
rv = NSS_CMSContentInfo_SetContentEncAlgID(poolp,
&(encd->contentInfo),
pbe_algid, keysize);
SECOID_DestroyAlgorithmID(pbe_algid, PR_TRUE);
}
}
if (rv != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return encd;
loser:
PORT_ArenaRelease(poolp, mark);
return NULL;
}
/*
* NSS_CMSEncryptedData_Destroy - destroy an encryptedData object
*/
void
NSS_CMSEncryptedData_Destroy(NSSCMSEncryptedData *encd)
{
/* everything's in a pool, so don't worry about the storage */
NSS_CMSContentInfo_Destroy(&(encd->contentInfo));
return;
}
/*
* NSS_CMSEncryptedData_GetContentInfo - return pointer to encryptedData object's contentInfo
*/
NSSCMSContentInfo *
NSS_CMSEncryptedData_GetContentInfo(NSSCMSEncryptedData *encd)
{
return &(encd->contentInfo);
}
/*
* NSS_CMSEncryptedData_Encode_BeforeStart - do all the necessary things to a EncryptedData
* before encoding begins.
*
* In particular:
* - set the correct version value.
* - get the encryption key
*/
SECStatus
NSS_CMSEncryptedData_Encode_BeforeStart(NSSCMSEncryptedData *encd)
{
int version;
PK11SymKey *bulkkey = NULL;
SECItem *dummy;
NSSCMSContentInfo *cinfo = &(encd->contentInfo);
if (NSS_CMSArray_IsEmpty((void **)encd->unprotectedAttr))
version = NSS_CMS_ENCRYPTED_DATA_VERSION;
else
version = NSS_CMS_ENCRYPTED_DATA_VERSION_UPATTR;
dummy = SEC_ASN1EncodeInteger(encd->cmsg->poolp, &(encd->version), version);
if (dummy == NULL)
return SECFailure;
/* now get content encryption key (bulk key) by using our cmsg callback */
if (encd->cmsg->decrypt_key_cb)
bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg,
NSS_CMSContentInfo_GetContentEncAlg(cinfo));
if (bulkkey == NULL)
return SECFailure;
/* store the bulk key in the contentInfo so that the encoder can find it */
NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey);
PK11_FreeSymKey(bulkkey);
return SECSuccess;
}
/*
* NSS_CMSEncryptedData_Encode_BeforeData - set up encryption
*/
SECStatus
NSS_CMSEncryptedData_Encode_BeforeData(NSSCMSEncryptedData *encd)
{
NSSCMSContentInfo *cinfo;
PK11SymKey *bulkkey;
SECAlgorithmID *algid;
SECStatus rv;
cinfo = &(encd->contentInfo);
/* find bulkkey and algorithm - must have been set by NSS_CMSEncryptedData_Encode_BeforeStart */
bulkkey = NSS_CMSContentInfo_GetBulkKey(cinfo);
if (bulkkey == NULL)
return SECFailure;
algid = NSS_CMSContentInfo_GetContentEncAlg(cinfo);
if (algid == NULL)
return SECFailure;
rv = NSS_CMSContentInfo_Private_Init(cinfo);
if (rv != SECSuccess) {
return SECFailure;
}
/* this may modify algid (with IVs generated in a token).
* it is therefore essential that algid is a pointer to the "real" contentEncAlg,
* not just to a copy */
cinfo->privateInfo->ciphcx = NSS_CMSCipherContext_StartEncrypt(encd->cmsg->poolp,
bulkkey, algid);
PK11_FreeSymKey(bulkkey);
if (cinfo->privateInfo->ciphcx == NULL)
return SECFailure;
return SECSuccess;
}
/*
* NSS_CMSEncryptedData_Encode_AfterData - finalize this encryptedData for encoding
*/
SECStatus
NSS_CMSEncryptedData_Encode_AfterData(NSSCMSEncryptedData *encd)
{
if (encd->contentInfo.privateInfo && encd->contentInfo.privateInfo->ciphcx) {
NSS_CMSCipherContext_Destroy(encd->contentInfo.privateInfo->ciphcx);
encd->contentInfo.privateInfo->ciphcx = NULL;
}
/* nothing to do after data */
return SECSuccess;
}
/*
* NSS_CMSEncryptedData_Decode_BeforeData - find bulk key & set up decryption
*/
SECStatus
NSS_CMSEncryptedData_Decode_BeforeData(NSSCMSEncryptedData *encd)
{
PK11SymKey *bulkkey = NULL;
NSSCMSContentInfo *cinfo;
SECAlgorithmID *bulkalg;
SECStatus rv = SECFailure;
cinfo = &(encd->contentInfo);
bulkalg = NSS_CMSContentInfo_GetContentEncAlg(cinfo);
if (encd->cmsg->decrypt_key_cb == NULL) /* no callback? no key../ */
goto loser;
bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg, bulkalg);
if (bulkkey == NULL)
/* no success finding a bulk key */
goto loser;
NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey);
rv = NSS_CMSContentInfo_Private_Init(cinfo);
if (rv != SECSuccess) {
goto loser;
}
rv = SECFailure;
cinfo->privateInfo->ciphcx = NSS_CMSCipherContext_StartDecrypt(bulkkey, bulkalg);
if (cinfo->privateInfo->ciphcx == NULL)
goto loser; /* error has been set by NSS_CMSCipherContext_StartDecrypt */
/* we are done with (this) bulkkey now. */
PK11_FreeSymKey(bulkkey);
rv = SECSuccess;
loser:
return rv;
}
/*
* NSS_CMSEncryptedData_Decode_AfterData - finish decrypting this encryptedData's content
*/
SECStatus
NSS_CMSEncryptedData_Decode_AfterData(NSSCMSEncryptedData *encd)
{
if (encd->contentInfo.privateInfo && encd->contentInfo.privateInfo->ciphcx) {
NSS_CMSCipherContext_Destroy(encd->contentInfo.privateInfo->ciphcx);
encd->contentInfo.privateInfo->ciphcx = NULL;
}
return SECSuccess;
}
/*
* NSS_CMSEncryptedData_Decode_AfterEnd - finish decoding this encryptedData
*/
SECStatus
NSS_CMSEncryptedData_Decode_AfterEnd(NSSCMSEncryptedData *encd)
{
/* apply final touches */
return SECSuccess;
}
|
