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
|
/* 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/. */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "prtypes.h"
#include "blapit.h"
#include "blapii.h"
#include "ctr.h"
#include "pkcs11t.h"
#include "secerr.h"
#ifdef USE_HW_AES
#ifdef NSS_X86_OR_X64
#include "intel-aes.h"
#endif
#include "rijndael.h"
#endif
#if defined(__ARM_NEON) || defined(__ARM_NEON__)
#include <arm_neon.h>
#endif
SECStatus
CTR_InitContext(CTRContext *ctr, void *context, freeblCipherFunc cipher,
const unsigned char *param)
{
const CK_AES_CTR_PARAMS *ctrParams = (const CK_AES_CTR_PARAMS *)param;
if (ctrParams->ulCounterBits == 0 ||
ctrParams->ulCounterBits > AES_BLOCK_SIZE * PR_BITS_PER_BYTE) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
/* Invariant: 0 < ctr->bufPtr <= AES_BLOCK_SIZE */
ctr->checkWrap = PR_FALSE;
ctr->bufPtr = AES_BLOCK_SIZE; /* no unused data in the buffer */
ctr->cipher = cipher;
ctr->context = context;
ctr->counterBits = ctrParams->ulCounterBits;
if (AES_BLOCK_SIZE > sizeof(ctr->counter) ||
AES_BLOCK_SIZE > sizeof(ctrParams->cb)) {
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
PORT_Memcpy(ctr->counter, ctrParams->cb, AES_BLOCK_SIZE);
if (ctr->counterBits < 64) {
PORT_Memcpy(ctr->counterFirst, ctr->counter, AES_BLOCK_SIZE);
ctr->checkWrap = PR_TRUE;
}
return SECSuccess;
}
CTRContext *
CTR_CreateContext(void *context, freeblCipherFunc cipher,
const unsigned char *param)
{
CTRContext *ctr;
SECStatus rv;
/* first fill in the Counter context */
ctr = PORT_ZNew(CTRContext);
if (ctr == NULL) {
return NULL;
}
rv = CTR_InitContext(ctr, context, cipher, param);
if (rv != SECSuccess) {
CTR_DestroyContext(ctr, PR_TRUE);
ctr = NULL;
}
return ctr;
}
void
CTR_DestroyContext(CTRContext *ctr, PRBool freeit)
{
PORT_Memset(ctr, 0, sizeof(CTRContext));
if (freeit) {
PORT_Free(ctr);
}
}
/*
* Used by counter mode. Increment the counter block. Not all bits in the
* counter block are part of the counter, counterBits tells how many bits
* are part of the counter. The counter block is blocksize long. It's a
* big endian value.
*
* XXX Does not handle counter rollover.
*/
static void
ctr_GetNextCtr(unsigned char *counter, unsigned int counterBits,
unsigned int blocksize)
{
unsigned char *counterPtr = counter + blocksize - 1;
unsigned char mask, count;
PORT_Assert(counterBits <= blocksize * PR_BITS_PER_BYTE);
while (counterBits >= PR_BITS_PER_BYTE) {
if (++(*(counterPtr--))) {
return;
}
counterBits -= PR_BITS_PER_BYTE;
}
if (counterBits == 0) {
return;
}
/* increment the final partial byte */
mask = (1 << counterBits) - 1;
count = ++(*counterPtr) & mask;
*counterPtr = ((*counterPtr) & ~mask) | count;
return;
}
static void
ctr_xor(unsigned char *target, const unsigned char *x,
const unsigned char *y, unsigned int count)
{
unsigned int i;
#if defined(__ARM_NEON) || defined(__ARM_NEON__)
while (count >= 16) {
vst1q_u8(target, veorq_u8(vld1q_u8(x), vld1q_u8(y)));
target += 16;
x += 16;
y += 16;
count -= 16;
}
#endif
for (i = 0; i < count; i++) {
*target++ = *x++ ^ *y++;
}
}
SECStatus
CTR_Update(CTRContext *ctr, unsigned char *outbuf,
unsigned int *outlen, unsigned int maxout,
const unsigned char *inbuf, unsigned int inlen,
unsigned int blocksize)
{
unsigned int tmp;
SECStatus rv;
// Limit block count to 2^counterBits - 2
if (ctr->counterBits < (sizeof(unsigned int) * 8) &&
inlen > ((1 << ctr->counterBits) - 2) * AES_BLOCK_SIZE) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
if (maxout < inlen) {
*outlen = inlen;
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
*outlen = 0;
if (ctr->bufPtr != blocksize) {
unsigned int needed = PR_MIN(blocksize - ctr->bufPtr, inlen);
ctr_xor(outbuf, inbuf, ctr->buffer + ctr->bufPtr, needed);
ctr->bufPtr += needed;
outbuf += needed;
inbuf += needed;
*outlen += needed;
inlen -= needed;
if (inlen == 0) {
return SECSuccess;
}
PORT_Assert(ctr->bufPtr == blocksize);
}
while (inlen >= blocksize) {
rv = (*ctr->cipher)(ctr->context, ctr->buffer, &tmp, blocksize,
ctr->counter, blocksize, blocksize);
ctr_GetNextCtr(ctr->counter, ctr->counterBits, blocksize);
if (ctr->checkWrap) {
if (PORT_Memcmp(ctr->counter, ctr->counterFirst, blocksize) == 0) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
}
if (rv != SECSuccess) {
return SECFailure;
}
ctr_xor(outbuf, inbuf, ctr->buffer, blocksize);
outbuf += blocksize;
inbuf += blocksize;
*outlen += blocksize;
inlen -= blocksize;
}
if (inlen == 0) {
return SECSuccess;
}
rv = (*ctr->cipher)(ctr->context, ctr->buffer, &tmp, blocksize,
ctr->counter, blocksize, blocksize);
ctr_GetNextCtr(ctr->counter, ctr->counterBits, blocksize);
if (ctr->checkWrap) {
if (PORT_Memcmp(ctr->counter, ctr->counterFirst, blocksize) == 0) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
}
if (rv != SECSuccess) {
return SECFailure;
}
ctr_xor(outbuf, inbuf, ctr->buffer, inlen);
ctr->bufPtr = inlen;
*outlen += inlen;
return SECSuccess;
}
#if defined(USE_HW_AES) && defined(_MSC_VER) && defined(NSS_X86_OR_X64)
SECStatus
CTR_Update_HW_AES(CTRContext *ctr, unsigned char *outbuf,
unsigned int *outlen, unsigned int maxout,
const unsigned char *inbuf, unsigned int inlen,
unsigned int blocksize)
{
unsigned int fullblocks;
unsigned int tmp;
SECStatus rv;
// Limit block count to 2^counterBits - 2
if (ctr->counterBits < (sizeof(unsigned int) * 8) &&
inlen > ((1 << ctr->counterBits) - 2) * AES_BLOCK_SIZE) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
if (maxout < inlen) {
*outlen = inlen;
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
*outlen = 0;
if (ctr->bufPtr != blocksize) {
unsigned int needed = PR_MIN(blocksize - ctr->bufPtr, inlen);
ctr_xor(outbuf, inbuf, ctr->buffer + ctr->bufPtr, needed);
ctr->bufPtr += needed;
outbuf += needed;
inbuf += needed;
*outlen += needed;
inlen -= needed;
if (inlen == 0) {
return SECSuccess;
}
PORT_Assert(ctr->bufPtr == blocksize);
}
if (inlen >= blocksize) {
rv = intel_aes_ctr_worker(((AESContext *)(ctr->context))->Nr)(
ctr, outbuf, outlen, maxout, inbuf, inlen, blocksize);
if (rv != SECSuccess) {
return SECFailure;
}
fullblocks = (inlen / blocksize) * blocksize;
*outlen += fullblocks;
outbuf += fullblocks;
inbuf += fullblocks;
inlen -= fullblocks;
}
if (inlen == 0) {
return SECSuccess;
}
rv = (*ctr->cipher)(ctr->context, ctr->buffer, &tmp, blocksize,
ctr->counter, blocksize, blocksize);
ctr_GetNextCtr(ctr->counter, ctr->counterBits, blocksize);
if (rv != SECSuccess) {
return SECFailure;
}
ctr_xor(outbuf, inbuf, ctr->buffer, inlen);
ctr->bufPtr = inlen;
*outlen += inlen;
return SECSuccess;
}
#endif
|
