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7e729bb5 | 1 | /* |
846e33c7 | 2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved. |
7e729bb5 | 3 | * |
846e33c7 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
7e729bb5 MC |
8 | */ |
9 | ||
10 | #ifndef HEADER_PACKET_LOCL_H | |
11 | # define HEADER_PACKET_LOCL_H | |
12 | ||
13 | # include <string.h> | |
14 | # include <openssl/bn.h> | |
15 | # include <openssl/buffer.h> | |
31011544 | 16 | # include <openssl/crypto.h> |
80e0ecbf | 17 | # include <openssl/e_os2.h> |
7e729bb5 | 18 | |
1de1d768 RL |
19 | # include "internal/numbers.h" |
20 | ||
7e729bb5 MC |
21 | # ifdef __cplusplus |
22 | extern "C" { | |
23 | # endif | |
24 | ||
25 | typedef struct { | |
7e729bb5 | 26 | /* Pointer to where we are currently reading from */ |
b6981744 | 27 | const unsigned char *curr; |
6a12a574 EK |
28 | /* Number of bytes remaining */ |
29 | size_t remaining; | |
7e729bb5 MC |
30 | } PACKET; |
31 | ||
6a12a574 | 32 | /* Internal unchecked shorthand; don't use outside this file. */ |
80e0ecbf | 33 | static ossl_inline void packet_forward(PACKET *pkt, size_t len) |
6a12a574 EK |
34 | { |
35 | pkt->curr += len; | |
36 | pkt->remaining -= len; | |
37 | } | |
38 | ||
7e729bb5 | 39 | /* |
bc6616a4 | 40 | * Returns the number of bytes remaining to be read in the PACKET |
7e729bb5 | 41 | */ |
80e0ecbf | 42 | static ossl_inline size_t PACKET_remaining(const PACKET *pkt) |
7e729bb5 | 43 | { |
6a12a574 | 44 | return pkt->remaining; |
7e729bb5 MC |
45 | } |
46 | ||
06217867 EK |
47 | /* |
48 | * Returns a pointer to the first byte after the packet data. | |
49 | * Useful for integrating with non-PACKET parsing code. | |
50 | * Specifically, we use PACKET_end() to verify that a d2i_... call | |
51 | * has consumed the entire packet contents. | |
52 | */ | |
53 | static ossl_inline const unsigned char *PACKET_end(const PACKET *pkt) | |
54 | { | |
55 | return pkt->curr + pkt->remaining; | |
56 | } | |
ec30e856 EK |
57 | /* |
58 | * Returns a pointer to the PACKET's current position. | |
59 | * For use in non-PACKETized APIs. | |
ec30e856 | 60 | */ |
b6981744 | 61 | static ossl_inline const unsigned char *PACKET_data(const PACKET *pkt) |
ec30e856 EK |
62 | { |
63 | return pkt->curr; | |
64 | } | |
65 | ||
7e729bb5 MC |
66 | /* |
67 | * Initialise a PACKET with |len| bytes held in |buf|. This does not make a | |
68 | * copy of the data so |buf| must be present for the whole time that the PACKET | |
69 | * is being used. | |
70 | */ | |
b6981744 EK |
71 | __owur static ossl_inline int PACKET_buf_init(PACKET *pkt, |
72 | const unsigned char *buf, | |
80e0ecbf | 73 | size_t len) |
7e729bb5 | 74 | { |
6a12a574 | 75 | /* Sanity check for negative values. */ |
3fde6c92 | 76 | if (len > (size_t)(SIZE_MAX / 2)) |
7e729bb5 | 77 | return 0; |
7e729bb5 | 78 | |
6a12a574 EK |
79 | pkt->curr = buf; |
80 | pkt->remaining = len; | |
7e729bb5 MC |
81 | return 1; |
82 | } | |
83 | ||
b3e2272c | 84 | /* Initialize a PACKET to hold zero bytes. */ |
80e0ecbf | 85 | static ossl_inline void PACKET_null_init(PACKET *pkt) |
b3e2272c EK |
86 | { |
87 | pkt->curr = NULL; | |
88 | pkt->remaining = 0; | |
89 | } | |
90 | ||
31011544 EK |
91 | /* |
92 | * Returns 1 if the packet has length |num| and its contents equal the |num| | |
93 | * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal). | |
94 | * If lengths are equal, performs the comparison in constant time. | |
95 | */ | |
80e0ecbf DSH |
96 | __owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr, |
97 | size_t num) | |
98 | { | |
31011544 EK |
99 | if (PACKET_remaining(pkt) != num) |
100 | return 0; | |
101 | return CRYPTO_memcmp(pkt->curr, ptr, num) == 0; | |
102 | } | |
103 | ||
7e729bb5 MC |
104 | /* |
105 | * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|. | |
106 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
107 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
108 | */ | |
80e0ecbf DSH |
109 | __owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt, |
110 | PACKET *subpkt, | |
111 | size_t len) | |
7e729bb5 MC |
112 | { |
113 | if (PACKET_remaining(pkt) < len) | |
114 | return 0; | |
115 | ||
f4f78ff7 | 116 | return PACKET_buf_init(subpkt, pkt->curr, len); |
7e729bb5 MC |
117 | } |
118 | ||
119 | /* | |
120 | * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not | |
121 | * copied: the |subpkt| packet will share its underlying buffer with the | |
122 | * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
123 | */ | |
80e0ecbf DSH |
124 | __owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt, |
125 | PACKET *subpkt, | |
126 | size_t len) | |
7e729bb5 MC |
127 | { |
128 | if (!PACKET_peek_sub_packet(pkt, subpkt, len)) | |
129 | return 0; | |
130 | ||
6a12a574 | 131 | packet_forward(pkt, len); |
7e729bb5 MC |
132 | |
133 | return 1; | |
134 | } | |
135 | ||
80e0ecbf DSH |
136 | /* |
137 | * Peek ahead at 2 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
138 | * |*data| |
139 | */ | |
80e0ecbf DSH |
140 | __owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt, |
141 | unsigned int *data) | |
7e729bb5 MC |
142 | { |
143 | if (PACKET_remaining(pkt) < 2) | |
144 | return 0; | |
145 | ||
80e0ecbf | 146 | *data = ((unsigned int)(*pkt->curr)) << 8; |
7e729bb5 MC |
147 | *data |= *(pkt->curr + 1); |
148 | ||
149 | return 1; | |
150 | } | |
151 | ||
152 | /* Equivalent of n2s */ | |
153 | /* Get 2 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
154 | __owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, |
155 | unsigned int *data) | |
7e729bb5 MC |
156 | { |
157 | if (!PACKET_peek_net_2(pkt, data)) | |
158 | return 0; | |
159 | ||
6a12a574 | 160 | packet_forward(pkt, 2); |
7e729bb5 MC |
161 | |
162 | return 1; | |
163 | } | |
164 | ||
80e0ecbf DSH |
165 | /* |
166 | * Peek ahead at 3 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
167 | * |*data| |
168 | */ | |
80e0ecbf DSH |
169 | __owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt, |
170 | unsigned long *data) | |
7e729bb5 MC |
171 | { |
172 | if (PACKET_remaining(pkt) < 3) | |
173 | return 0; | |
174 | ||
80e0ecbf DSH |
175 | *data = ((unsigned long)(*pkt->curr)) << 16; |
176 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; | |
44128847 | 177 | *data |= *(pkt->curr + 2); |
7e729bb5 MC |
178 | |
179 | return 1; | |
180 | } | |
181 | ||
182 | /* Equivalent of n2l3 */ | |
183 | /* Get 3 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
184 | __owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, |
185 | unsigned long *data) | |
7e729bb5 MC |
186 | { |
187 | if (!PACKET_peek_net_3(pkt, data)) | |
188 | return 0; | |
189 | ||
6a12a574 | 190 | packet_forward(pkt, 3); |
7e729bb5 MC |
191 | |
192 | return 1; | |
193 | } | |
194 | ||
80e0ecbf DSH |
195 | /* |
196 | * Peek ahead at 4 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
197 | * |*data| |
198 | */ | |
80e0ecbf DSH |
199 | __owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt, |
200 | unsigned long *data) | |
7e729bb5 MC |
201 | { |
202 | if (PACKET_remaining(pkt) < 4) | |
203 | return 0; | |
204 | ||
80e0ecbf | 205 | *data = ((unsigned long)(*pkt->curr)) << 24; |
44128847 | 206 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 16; |
80e0ecbf DSH |
207 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 8; |
208 | *data |= *(pkt->curr + 3); | |
7e729bb5 MC |
209 | |
210 | return 1; | |
211 | } | |
212 | ||
213 | /* Equivalent of n2l */ | |
214 | /* Get 4 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
215 | __owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, |
216 | unsigned long *data) | |
7e729bb5 MC |
217 | { |
218 | if (!PACKET_peek_net_4(pkt, data)) | |
219 | return 0; | |
220 | ||
6a12a574 | 221 | packet_forward(pkt, 4); |
7e729bb5 MC |
222 | |
223 | return 1; | |
224 | } | |
225 | ||
226 | /* Peek ahead at 1 byte from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
227 | __owur static ossl_inline int PACKET_peek_1(const PACKET *pkt, |
228 | unsigned int *data) | |
7e729bb5 MC |
229 | { |
230 | if (!PACKET_remaining(pkt)) | |
231 | return 0; | |
232 | ||
233 | *data = *pkt->curr; | |
234 | ||
235 | return 1; | |
236 | } | |
237 | ||
238 | /* Get 1 byte from |pkt| and store the value in |*data| */ | |
80e0ecbf | 239 | __owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data) |
7e729bb5 MC |
240 | { |
241 | if (!PACKET_peek_1(pkt, data)) | |
242 | return 0; | |
243 | ||
6a12a574 | 244 | packet_forward(pkt, 1); |
7e729bb5 MC |
245 | |
246 | return 1; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value | |
251 | * in |*data| | |
252 | */ | |
80e0ecbf DSH |
253 | __owur static ossl_inline int PACKET_peek_4(const PACKET *pkt, |
254 | unsigned long *data) | |
7e729bb5 MC |
255 | { |
256 | if (PACKET_remaining(pkt) < 4) | |
257 | return 0; | |
258 | ||
80e0ecbf DSH |
259 | *data = *pkt->curr; |
260 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; | |
44128847 MC |
261 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 16; |
262 | *data |= ((unsigned long)(*(pkt->curr + 3))) << 24; | |
7e729bb5 MC |
263 | |
264 | return 1; | |
265 | } | |
266 | ||
267 | /* Equivalent of c2l */ | |
268 | /* | |
269 | * Get 4 bytes in reverse network order from |pkt| and store the value in | |
270 | * |*data| | |
271 | */ | |
80e0ecbf | 272 | __owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data) |
7e729bb5 MC |
273 | { |
274 | if (!PACKET_peek_4(pkt, data)) | |
275 | return 0; | |
276 | ||
6a12a574 | 277 | packet_forward(pkt, 4); |
7e729bb5 MC |
278 | |
279 | return 1; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in | |
284 | * |*data|. This just points at the underlying buffer that |pkt| is using. The | |
285 | * caller should not free this data directly (it will be freed when the | |
286 | * underlying buffer gets freed | |
287 | */ | |
80e0ecbf | 288 | __owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt, |
b6981744 | 289 | const unsigned char **data, |
80e0ecbf | 290 | size_t len) |
7e729bb5 MC |
291 | { |
292 | if (PACKET_remaining(pkt) < len) | |
293 | return 0; | |
294 | ||
295 | *data = pkt->curr; | |
296 | ||
297 | return 1; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This | |
302 | * just points at the underlying buffer that |pkt| is using. The caller should | |
303 | * not free this data directly (it will be freed when the underlying buffer gets | |
304 | * freed | |
305 | */ | |
80e0ecbf | 306 | __owur static ossl_inline int PACKET_get_bytes(PACKET *pkt, |
b6981744 | 307 | const unsigned char **data, |
80e0ecbf | 308 | size_t len) |
7e729bb5 MC |
309 | { |
310 | if (!PACKET_peek_bytes(pkt, data, len)) | |
311 | return 0; | |
312 | ||
6a12a574 | 313 | packet_forward(pkt, len); |
7e729bb5 MC |
314 | |
315 | return 1; | |
316 | } | |
317 | ||
318 | /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */ | |
80e0ecbf DSH |
319 | __owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt, |
320 | unsigned char *data, | |
321 | size_t len) | |
7e729bb5 MC |
322 | { |
323 | if (PACKET_remaining(pkt) < len) | |
324 | return 0; | |
325 | ||
326 | memcpy(data, pkt->curr, len); | |
327 | ||
328 | return 1; | |
329 | } | |
330 | ||
6d41fc80 EK |
331 | /* |
332 | * Read |len| bytes from |pkt| and copy them to |data|. | |
333 | * The caller is responsible for ensuring that |data| can hold |len| bytes. | |
334 | */ | |
80e0ecbf DSH |
335 | __owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt, |
336 | unsigned char *data, | |
337 | size_t len) | |
7e729bb5 MC |
338 | { |
339 | if (!PACKET_peek_copy_bytes(pkt, data, len)) | |
340 | return 0; | |
341 | ||
6a12a574 | 342 | packet_forward(pkt, len); |
7e729bb5 MC |
343 | |
344 | return 1; | |
345 | } | |
346 | ||
67202973 EK |
347 | /* |
348 | * Copy packet data to |dest|, and set |len| to the number of copied bytes. | |
349 | * If the packet has more than |dest_len| bytes, nothing is copied. | |
350 | * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise. | |
351 | * Does not forward PACKET position (because it is typically the last thing | |
352 | * done with a given PACKET). | |
353 | */ | |
80e0ecbf DSH |
354 | __owur static ossl_inline int PACKET_copy_all(const PACKET *pkt, |
355 | unsigned char *dest, | |
356 | size_t dest_len, size_t *len) | |
357 | { | |
67202973 EK |
358 | if (PACKET_remaining(pkt) > dest_len) { |
359 | *len = 0; | |
360 | return 0; | |
361 | } | |
362 | *len = pkt->remaining; | |
363 | memcpy(dest, pkt->curr, pkt->remaining); | |
364 | return 1; | |
365 | } | |
366 | ||
6d41fc80 EK |
367 | /* |
368 | * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the | |
369 | * result in |*data|, and the length in |len|. | |
370 | * If |*data| is not NULL, the old data is OPENSSL_free'd. | |
371 | * If the packet is empty, or malloc fails, |*data| will be set to NULL. | |
372 | * Returns 1 if the malloc succeeds and 0 otherwise. | |
373 | * Does not forward PACKET position (because it is typically the last thing | |
374 | * done with a given PACKET). | |
375 | */ | |
80e0ecbf DSH |
376 | __owur static ossl_inline int PACKET_memdup(const PACKET *pkt, |
377 | unsigned char **data, size_t *len) | |
6d41fc80 EK |
378 | { |
379 | size_t length; | |
380 | ||
381 | OPENSSL_free(*data); | |
382 | *data = NULL; | |
383 | *len = 0; | |
384 | ||
385 | length = PACKET_remaining(pkt); | |
386 | ||
387 | if (length == 0) | |
388 | return 1; | |
389 | ||
7644a9ae | 390 | *data = OPENSSL_memdup(pkt->curr, length); |
6d41fc80 EK |
391 | if (*data == NULL) |
392 | return 0; | |
393 | ||
394 | *len = length; | |
395 | return 1; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated | |
400 | * buffer. Store a pointer to the result in |*data|. | |
401 | * If |*data| is not NULL, the old data is OPENSSL_free'd. | |
402 | * If the data in |pkt| does not contain a NUL-byte, the entire data is | |
403 | * copied and NUL-terminated. | |
404 | * Returns 1 if the malloc succeeds and 0 otherwise. | |
405 | * Does not forward PACKET position (because it is typically the last thing done | |
406 | * with a given PACKET). | |
407 | */ | |
80e0ecbf | 408 | __owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data) |
6d41fc80 EK |
409 | { |
410 | OPENSSL_free(*data); | |
32942870 EK |
411 | |
412 | /* This will succeed on an empty packet, unless pkt->curr == NULL. */ | |
80e0ecbf | 413 | *data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt)); |
6d41fc80 EK |
414 | return (*data != NULL); |
415 | } | |
416 | ||
06217867 EK |
417 | /* Returns 1 if |pkt| contains at least one 0-byte, 0 otherwise. */ |
418 | static ossl_inline int PACKET_contains_zero_byte(const PACKET *pkt) | |
419 | { | |
420 | return memchr(pkt->curr, 0, pkt->remaining) != NULL; | |
421 | } | |
422 | ||
7e729bb5 | 423 | /* Move the current reading position forward |len| bytes */ |
80e0ecbf | 424 | __owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len) |
7e729bb5 MC |
425 | { |
426 | if (PACKET_remaining(pkt) < len) | |
427 | return 0; | |
428 | ||
6a12a574 | 429 | packet_forward(pkt, len); |
7e729bb5 MC |
430 | |
431 | return 1; | |
432 | } | |
433 | ||
ec30e856 EK |
434 | /* |
435 | * Reads a variable-length vector prefixed with a one-byte length, and stores | |
436 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
437 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
438 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
439 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
440 | */ | |
80e0ecbf DSH |
441 | __owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt, |
442 | PACKET *subpkt) | |
ec30e856 | 443 | { |
80e0ecbf | 444 | unsigned int length; |
b6981744 | 445 | const unsigned char *data; |
80e0ecbf DSH |
446 | PACKET tmp = *pkt; |
447 | if (!PACKET_get_1(&tmp, &length) || | |
448 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
449 | return 0; | |
450 | } | |
451 | ||
452 | *pkt = tmp; | |
453 | subpkt->curr = data; | |
454 | subpkt->remaining = length; | |
455 | ||
456 | return 1; | |
ec30e856 EK |
457 | } |
458 | ||
06217867 EK |
459 | /* |
460 | * Like PACKET_get_length_prefixed_1, but additionally, fails when there are | |
461 | * leftover bytes in |pkt|. | |
462 | */ | |
463 | __owur static ossl_inline int PACKET_as_length_prefixed_1(PACKET *pkt, PACKET *subpkt) | |
464 | { | |
465 | unsigned int length; | |
466 | const unsigned char *data; | |
467 | PACKET tmp = *pkt; | |
468 | if (!PACKET_get_1(&tmp, &length) || | |
469 | !PACKET_get_bytes(&tmp, &data, (size_t)length) || | |
470 | PACKET_remaining(&tmp) != 0) { | |
471 | return 0; | |
472 | } | |
473 | ||
474 | *pkt = tmp; | |
475 | subpkt->curr = data; | |
476 | subpkt->remaining = length; | |
477 | ||
478 | return 1; | |
479 | } | |
480 | ||
ec30e856 EK |
481 | /* |
482 | * Reads a variable-length vector prefixed with a two-byte length, and stores | |
483 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
484 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
485 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
486 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
487 | */ | |
80e0ecbf DSH |
488 | __owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt, |
489 | PACKET *subpkt) | |
ec30e856 | 490 | { |
80e0ecbf | 491 | unsigned int length; |
b6981744 | 492 | const unsigned char *data; |
80e0ecbf | 493 | PACKET tmp = *pkt; |
06217867 | 494 | |
80e0ecbf DSH |
495 | if (!PACKET_get_net_2(&tmp, &length) || |
496 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
497 | return 0; | |
498 | } | |
499 | ||
500 | *pkt = tmp; | |
501 | subpkt->curr = data; | |
502 | subpkt->remaining = length; | |
503 | ||
504 | return 1; | |
ec30e856 EK |
505 | } |
506 | ||
06217867 EK |
507 | /* |
508 | * Like PACKET_get_length_prefixed_2, but additionally, fails when there are | |
509 | * leftover bytes in |pkt|. | |
510 | */ | |
511 | __owur static ossl_inline int PACKET_as_length_prefixed_2(PACKET *pkt, | |
512 | PACKET *subpkt) | |
513 | { | |
514 | unsigned int length; | |
515 | const unsigned char *data; | |
516 | PACKET tmp = *pkt; | |
517 | ||
518 | if (!PACKET_get_net_2(&tmp, &length) || | |
519 | !PACKET_get_bytes(&tmp, &data, (size_t)length) || | |
520 | PACKET_remaining(&tmp) != 0) { | |
521 | return 0; | |
522 | } | |
523 | ||
524 | *pkt = tmp; | |
525 | subpkt->curr = data; | |
526 | subpkt->remaining = length; | |
527 | ||
528 | return 1; | |
529 | } | |
530 | ||
ec30e856 EK |
531 | /* |
532 | * Reads a variable-length vector prefixed with a three-byte length, and stores | |
533 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
534 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
535 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
536 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
537 | */ | |
80e0ecbf DSH |
538 | __owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt, |
539 | PACKET *subpkt) | |
ec30e856 | 540 | { |
80e0ecbf | 541 | unsigned long length; |
b6981744 | 542 | const unsigned char *data; |
80e0ecbf DSH |
543 | PACKET tmp = *pkt; |
544 | if (!PACKET_get_net_3(&tmp, &length) || | |
545 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
546 | return 0; | |
547 | } | |
548 | ||
549 | *pkt = tmp; | |
550 | subpkt->curr = data; | |
551 | subpkt->remaining = length; | |
552 | ||
553 | return 1; | |
ec30e856 | 554 | } |
7e729bb5 MC |
555 | # ifdef __cplusplus |
556 | } | |
557 | # endif | |
558 | ||
80e0ecbf | 559 | #endif /* HEADER_PACKET_LOCL_H */ |