1 /**
2 * \file cipher.c
3 *
4 * \brief Generic cipher wrapper for Mbed TLS
5 *
6 * \author Adriaan de Jong <dejong@fox-it.com>
7 *
8 * Copyright The Mbed TLS Contributors
9 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
10 */
11
12 #include "common.h"
13
14 #if defined(MBEDTLS_CIPHER_C)
15
16 #include "mbedtls/cipher.h"
17 #include "cipher_wrap.h"
18 #include "mbedtls/platform_util.h"
19 #include "mbedtls/error.h"
20 #include "mbedtls/constant_time.h"
21 #include "constant_time_internal.h"
22
23 #include <stdlib.h>
24 #include <string.h>
25
26 #if defined(MBEDTLS_CHACHAPOLY_C)
27 #include "mbedtls/chachapoly.h"
28 #endif
29
30 #if defined(MBEDTLS_GCM_C)
31 #include "mbedtls/gcm.h"
32 #endif
33
34 #if defined(MBEDTLS_CCM_C)
35 #include "mbedtls/ccm.h"
36 #endif
37
38 #if defined(MBEDTLS_CHACHA20_C)
39 #include "mbedtls/chacha20.h"
40 #endif
41
42 #if defined(MBEDTLS_CMAC_C)
43 #include "mbedtls/cmac.h"
44 #endif
45
46 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
47 #include "psa/crypto.h"
48 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
49
50 #if defined(MBEDTLS_NIST_KW_C)
51 #include "mbedtls/nist_kw.h"
52 #endif
53
54 #include "mbedtls/platform.h"
55
56 static int supported_init = 0;
57
mbedtls_cipher_get_base(const mbedtls_cipher_info_t * info)58 static inline const mbedtls_cipher_base_t *mbedtls_cipher_get_base(
59 const mbedtls_cipher_info_t *info)
60 {
61 return mbedtls_cipher_base_lookup_table[info->base_idx];
62 }
63
mbedtls_cipher_list(void)64 const int *mbedtls_cipher_list(void)
65 {
66 const mbedtls_cipher_definition_t *def;
67 int *type;
68
69 if (!supported_init) {
70 def = mbedtls_cipher_definitions;
71 type = mbedtls_cipher_supported;
72
73 while (def->type != 0) {
74 *type++ = (*def++).type;
75 }
76
77 *type = 0;
78
79 supported_init = 1;
80 }
81
82 return mbedtls_cipher_supported;
83 }
84
mbedtls_cipher_info_from_type(const mbedtls_cipher_type_t cipher_type)85 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type(
86 const mbedtls_cipher_type_t cipher_type)
87 {
88 const mbedtls_cipher_definition_t *def;
89
90 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
91 if (def->type == cipher_type) {
92 return def->info;
93 }
94 }
95
96 return NULL;
97 }
98
mbedtls_cipher_info_from_string(const char * cipher_name)99 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string(
100 const char *cipher_name)
101 {
102 const mbedtls_cipher_definition_t *def;
103
104 if (NULL == cipher_name) {
105 return NULL;
106 }
107
108 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
109 if (!strcmp(def->info->name, cipher_name)) {
110 return def->info;
111 }
112 }
113
114 return NULL;
115 }
116
mbedtls_cipher_info_from_values(const mbedtls_cipher_id_t cipher_id,int key_bitlen,const mbedtls_cipher_mode_t mode)117 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values(
118 const mbedtls_cipher_id_t cipher_id,
119 int key_bitlen,
120 const mbedtls_cipher_mode_t mode)
121 {
122 const mbedtls_cipher_definition_t *def;
123
124 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
125 if (mbedtls_cipher_get_base(def->info)->cipher == cipher_id &&
126 mbedtls_cipher_info_get_key_bitlen(def->info) == (unsigned) key_bitlen &&
127 def->info->mode == mode) {
128 return def->info;
129 }
130 }
131
132 return NULL;
133 }
134
135 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_psa_translate_cipher_type(mbedtls_cipher_type_t cipher)136 static inline psa_key_type_t mbedtls_psa_translate_cipher_type(
137 mbedtls_cipher_type_t cipher)
138 {
139 switch (cipher) {
140 case MBEDTLS_CIPHER_AES_128_CCM:
141 case MBEDTLS_CIPHER_AES_192_CCM:
142 case MBEDTLS_CIPHER_AES_256_CCM:
143 case MBEDTLS_CIPHER_AES_128_CCM_STAR_NO_TAG:
144 case MBEDTLS_CIPHER_AES_192_CCM_STAR_NO_TAG:
145 case MBEDTLS_CIPHER_AES_256_CCM_STAR_NO_TAG:
146 case MBEDTLS_CIPHER_AES_128_GCM:
147 case MBEDTLS_CIPHER_AES_192_GCM:
148 case MBEDTLS_CIPHER_AES_256_GCM:
149 case MBEDTLS_CIPHER_AES_128_CBC:
150 case MBEDTLS_CIPHER_AES_192_CBC:
151 case MBEDTLS_CIPHER_AES_256_CBC:
152 case MBEDTLS_CIPHER_AES_128_ECB:
153 case MBEDTLS_CIPHER_AES_192_ECB:
154 case MBEDTLS_CIPHER_AES_256_ECB:
155 return PSA_KEY_TYPE_AES;
156
157 /* ARIA not yet supported in PSA. */
158 /* case MBEDTLS_CIPHER_ARIA_128_CCM:
159 case MBEDTLS_CIPHER_ARIA_192_CCM:
160 case MBEDTLS_CIPHER_ARIA_256_CCM:
161 case MBEDTLS_CIPHER_ARIA_128_CCM_STAR_NO_TAG:
162 case MBEDTLS_CIPHER_ARIA_192_CCM_STAR_NO_TAG:
163 case MBEDTLS_CIPHER_ARIA_256_CCM_STAR_NO_TAG:
164 case MBEDTLS_CIPHER_ARIA_128_GCM:
165 case MBEDTLS_CIPHER_ARIA_192_GCM:
166 case MBEDTLS_CIPHER_ARIA_256_GCM:
167 case MBEDTLS_CIPHER_ARIA_128_CBC:
168 case MBEDTLS_CIPHER_ARIA_192_CBC:
169 case MBEDTLS_CIPHER_ARIA_256_CBC:
170 return( PSA_KEY_TYPE_ARIA ); */
171
172 default:
173 return 0;
174 }
175 }
176
mbedtls_psa_translate_cipher_mode(mbedtls_cipher_mode_t mode,size_t taglen)177 static inline psa_algorithm_t mbedtls_psa_translate_cipher_mode(
178 mbedtls_cipher_mode_t mode, size_t taglen)
179 {
180 switch (mode) {
181 case MBEDTLS_MODE_ECB:
182 return PSA_ALG_ECB_NO_PADDING;
183 case MBEDTLS_MODE_GCM:
184 return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, taglen);
185 case MBEDTLS_MODE_CCM:
186 return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen);
187 case MBEDTLS_MODE_CCM_STAR_NO_TAG:
188 return PSA_ALG_CCM_STAR_NO_TAG;
189 case MBEDTLS_MODE_CBC:
190 if (taglen == 0) {
191 return PSA_ALG_CBC_NO_PADDING;
192 } else {
193 return 0;
194 }
195 default:
196 return 0;
197 }
198 }
199 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
200
mbedtls_cipher_init(mbedtls_cipher_context_t * ctx)201 void mbedtls_cipher_init(mbedtls_cipher_context_t *ctx)
202 {
203 memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
204 }
205
mbedtls_cipher_free(mbedtls_cipher_context_t * ctx)206 void mbedtls_cipher_free(mbedtls_cipher_context_t *ctx)
207 {
208 if (ctx == NULL) {
209 return;
210 }
211
212 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
213 if (ctx->psa_enabled == 1) {
214 if (ctx->cipher_ctx != NULL) {
215 mbedtls_cipher_context_psa * const cipher_psa =
216 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
217
218 if (cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED) {
219 /* xxx_free() doesn't allow to return failures. */
220 (void) psa_destroy_key(cipher_psa->slot);
221 }
222
223 mbedtls_zeroize_and_free(cipher_psa, sizeof(*cipher_psa));
224 }
225
226 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t));
227 return;
228 }
229 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
230
231 #if defined(MBEDTLS_CMAC_C)
232 if (ctx->cmac_ctx) {
233 mbedtls_zeroize_and_free(ctx->cmac_ctx,
234 sizeof(mbedtls_cmac_context_t));
235 }
236 #endif
237
238 if (ctx->cipher_ctx) {
239 mbedtls_cipher_get_base(ctx->cipher_info)->ctx_free_func(ctx->cipher_ctx);
240 }
241
242 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t));
243 }
244
mbedtls_cipher_setup(mbedtls_cipher_context_t * ctx,const mbedtls_cipher_info_t * cipher_info)245 int mbedtls_cipher_setup(mbedtls_cipher_context_t *ctx,
246 const mbedtls_cipher_info_t *cipher_info)
247 {
248 if (cipher_info == NULL) {
249 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
250 }
251
252 memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
253
254 if (mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func != NULL) {
255 ctx->cipher_ctx = mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func();
256 if (ctx->cipher_ctx == NULL) {
257 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
258 }
259 }
260
261 ctx->cipher_info = cipher_info;
262
263 return 0;
264 }
265
266 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
mbedtls_cipher_setup_psa(mbedtls_cipher_context_t * ctx,const mbedtls_cipher_info_t * cipher_info,size_t taglen)267 int mbedtls_cipher_setup_psa(mbedtls_cipher_context_t *ctx,
268 const mbedtls_cipher_info_t *cipher_info,
269 size_t taglen)
270 {
271 psa_algorithm_t alg;
272 mbedtls_cipher_context_psa *cipher_psa;
273
274 if (NULL == cipher_info || NULL == ctx) {
275 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
276 }
277
278 /* Check that the underlying cipher mode and cipher type are
279 * supported by the underlying PSA Crypto implementation. */
280 alg = mbedtls_psa_translate_cipher_mode(((mbedtls_cipher_mode_t) cipher_info->mode), taglen);
281 if (alg == 0) {
282 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
283 }
284 if (mbedtls_psa_translate_cipher_type(((mbedtls_cipher_type_t) cipher_info->type)) == 0) {
285 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
286 }
287
288 memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
289
290 cipher_psa = mbedtls_calloc(1, sizeof(mbedtls_cipher_context_psa));
291 if (cipher_psa == NULL) {
292 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
293 }
294 cipher_psa->alg = alg;
295 ctx->cipher_ctx = cipher_psa;
296 ctx->cipher_info = cipher_info;
297 ctx->psa_enabled = 1;
298 return 0;
299 }
300 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
301
mbedtls_cipher_setkey(mbedtls_cipher_context_t * ctx,const unsigned char * key,int key_bitlen,const mbedtls_operation_t operation)302 int mbedtls_cipher_setkey(mbedtls_cipher_context_t *ctx,
303 const unsigned char *key,
304 int key_bitlen,
305 const mbedtls_operation_t operation)
306 {
307 if (operation != MBEDTLS_ENCRYPT && operation != MBEDTLS_DECRYPT) {
308 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
309 }
310 if (ctx->cipher_info == NULL) {
311 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
312 }
313 #if defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
314 if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) &&
315 MBEDTLS_DECRYPT == operation) {
316 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
317 }
318 #endif
319
320 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
321 if (ctx->psa_enabled == 1) {
322 mbedtls_cipher_context_psa * const cipher_psa =
323 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
324
325 size_t const key_bytelen = ((size_t) key_bitlen + 7) / 8;
326
327 psa_status_t status;
328 psa_key_type_t key_type;
329 psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
330
331 /* PSA Crypto API only accepts byte-aligned keys. */
332 if (key_bitlen % 8 != 0) {
333 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
334 }
335
336 /* Don't allow keys to be set multiple times. */
337 if (cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET) {
338 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
339 }
340
341 key_type = mbedtls_psa_translate_cipher_type(
342 ((mbedtls_cipher_type_t) ctx->cipher_info->type));
343 if (key_type == 0) {
344 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
345 }
346 psa_set_key_type(&attributes, key_type);
347
348 /* Mbed TLS' cipher layer doesn't enforce the mode of operation
349 * (encrypt vs. decrypt): it is possible to setup a key for encryption
350 * and use it for AEAD decryption. Until tests relying on this
351 * are changed, allow any usage in PSA. */
352 psa_set_key_usage_flags(&attributes,
353 PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT);
354 psa_set_key_algorithm(&attributes, cipher_psa->alg);
355
356 status = psa_import_key(&attributes, key, key_bytelen,
357 &cipher_psa->slot);
358 switch (status) {
359 case PSA_SUCCESS:
360 break;
361 case PSA_ERROR_INSUFFICIENT_MEMORY:
362 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
363 case PSA_ERROR_NOT_SUPPORTED:
364 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
365 default:
366 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
367 }
368 /* Indicate that we own the key slot and need to
369 * destroy it in mbedtls_cipher_free(). */
370 cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
371
372 ctx->key_bitlen = key_bitlen;
373 ctx->operation = operation;
374 return 0;
375 }
376 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
377
378 if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN) == 0 &&
379 (int) mbedtls_cipher_info_get_key_bitlen(ctx->cipher_info) != key_bitlen) {
380 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
381 }
382
383 ctx->key_bitlen = key_bitlen;
384 ctx->operation = operation;
385
386 #if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
387 /*
388 * For OFB, CFB and CTR mode always use the encryption key schedule
389 */
390 if (MBEDTLS_ENCRYPT == operation ||
391 MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
392 MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
393 MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
394 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key,
395 ctx->key_bitlen);
396 }
397
398 if (MBEDTLS_DECRYPT == operation) {
399 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_dec_func(ctx->cipher_ctx, key,
400 ctx->key_bitlen);
401 }
402 #else
403 if (operation == MBEDTLS_ENCRYPT || operation == MBEDTLS_DECRYPT) {
404 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key,
405 ctx->key_bitlen);
406 }
407 #endif
408
409 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
410 }
411
mbedtls_cipher_set_iv(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len)412 int mbedtls_cipher_set_iv(mbedtls_cipher_context_t *ctx,
413 const unsigned char *iv,
414 size_t iv_len)
415 {
416 size_t actual_iv_size;
417
418 if (ctx->cipher_info == NULL) {
419 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
420 }
421 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
422 if (ctx->psa_enabled == 1) {
423 /* While PSA Crypto has an API for multipart
424 * operations, we currently don't make it
425 * accessible through the cipher layer. */
426 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
427 }
428 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
429
430 /* avoid buffer overflow in ctx->iv */
431 if (iv_len > MBEDTLS_MAX_IV_LENGTH) {
432 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
433 }
434
435 if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN) != 0) {
436 actual_iv_size = iv_len;
437 } else {
438 actual_iv_size = mbedtls_cipher_info_get_iv_size(ctx->cipher_info);
439
440 /* avoid reading past the end of input buffer */
441 if (actual_iv_size > iv_len) {
442 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
443 }
444 }
445
446 #if defined(MBEDTLS_CHACHA20_C)
447 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20) {
448 /* Even though the actual_iv_size is overwritten with a correct value
449 * of 12 from the cipher info, return an error to indicate that
450 * the input iv_len is wrong. */
451 if (iv_len != 12) {
452 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
453 }
454
455 if (0 != mbedtls_chacha20_starts((mbedtls_chacha20_context *) ctx->cipher_ctx,
456 iv,
457 0U)) { /* Initial counter value */
458 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
459 }
460 }
461 #if defined(MBEDTLS_CHACHAPOLY_C)
462 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
463 iv_len != 12) {
464 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
465 }
466 #endif
467 #endif
468
469 #if defined(MBEDTLS_GCM_C)
470 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
471 return mbedtls_gcm_starts((mbedtls_gcm_context *) ctx->cipher_ctx,
472 ctx->operation,
473 iv, iv_len);
474 }
475 #endif
476
477 #if defined(MBEDTLS_CCM_C)
478 if (MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
479 int set_lengths_result;
480 int ccm_star_mode;
481
482 set_lengths_result = mbedtls_ccm_set_lengths(
483 (mbedtls_ccm_context *) ctx->cipher_ctx,
484 0, 0, 0);
485 if (set_lengths_result != 0) {
486 return set_lengths_result;
487 }
488
489 if (ctx->operation == MBEDTLS_DECRYPT) {
490 ccm_star_mode = MBEDTLS_CCM_STAR_DECRYPT;
491 } else if (ctx->operation == MBEDTLS_ENCRYPT) {
492 ccm_star_mode = MBEDTLS_CCM_STAR_ENCRYPT;
493 } else {
494 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
495 }
496
497 return mbedtls_ccm_starts((mbedtls_ccm_context *) ctx->cipher_ctx,
498 ccm_star_mode,
499 iv, iv_len);
500 }
501 #endif
502
503 if (actual_iv_size != 0) {
504 memcpy(ctx->iv, iv, actual_iv_size);
505 ctx->iv_size = actual_iv_size;
506 }
507
508 return 0;
509 }
510
mbedtls_cipher_reset(mbedtls_cipher_context_t * ctx)511 int mbedtls_cipher_reset(mbedtls_cipher_context_t *ctx)
512 {
513 if (ctx->cipher_info == NULL) {
514 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
515 }
516
517 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
518 if (ctx->psa_enabled == 1) {
519 /* We don't support resetting PSA-based
520 * cipher contexts, yet. */
521 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
522 }
523 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
524
525 ctx->unprocessed_len = 0;
526
527 return 0;
528 }
529
530 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
mbedtls_cipher_update_ad(mbedtls_cipher_context_t * ctx,const unsigned char * ad,size_t ad_len)531 int mbedtls_cipher_update_ad(mbedtls_cipher_context_t *ctx,
532 const unsigned char *ad, size_t ad_len)
533 {
534 if (ctx->cipher_info == NULL) {
535 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
536 }
537
538 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
539 if (ctx->psa_enabled == 1) {
540 /* While PSA Crypto has an API for multipart
541 * operations, we currently don't make it
542 * accessible through the cipher layer. */
543 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
544 }
545 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
546
547 #if defined(MBEDTLS_GCM_C)
548 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
549 return mbedtls_gcm_update_ad((mbedtls_gcm_context *) ctx->cipher_ctx,
550 ad, ad_len);
551 }
552 #endif
553
554 #if defined(MBEDTLS_CHACHAPOLY_C)
555 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) {
556 int result;
557 mbedtls_chachapoly_mode_t mode;
558
559 mode = (ctx->operation == MBEDTLS_ENCRYPT)
560 ? MBEDTLS_CHACHAPOLY_ENCRYPT
561 : MBEDTLS_CHACHAPOLY_DECRYPT;
562
563 result = mbedtls_chachapoly_starts((mbedtls_chachapoly_context *) ctx->cipher_ctx,
564 ctx->iv,
565 mode);
566 if (result != 0) {
567 return result;
568 }
569
570 return mbedtls_chachapoly_update_aad((mbedtls_chachapoly_context *) ctx->cipher_ctx,
571 ad, ad_len);
572 }
573 #endif
574
575 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
576 }
577 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
578
mbedtls_cipher_update(mbedtls_cipher_context_t * ctx,const unsigned char * input,size_t ilen,unsigned char * output,size_t * olen)579 int mbedtls_cipher_update(mbedtls_cipher_context_t *ctx, const unsigned char *input,
580 size_t ilen, unsigned char *output, size_t *olen)
581 {
582 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
583 size_t block_size;
584
585 if (ctx->cipher_info == NULL) {
586 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
587 }
588
589 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
590 if (ctx->psa_enabled == 1) {
591 /* While PSA Crypto has an API for multipart
592 * operations, we currently don't make it
593 * accessible through the cipher layer. */
594 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
595 }
596 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
597
598 *olen = 0;
599 block_size = mbedtls_cipher_get_block_size(ctx);
600 if (0 == block_size) {
601 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
602 }
603
604 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_ECB) {
605 if (ilen != block_size) {
606 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
607 }
608
609 *olen = ilen;
610
611 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ecb_func(ctx->cipher_ctx,
612 ctx->operation, input,
613 output))) {
614 return ret;
615 }
616
617 return 0;
618 }
619
620 #if defined(MBEDTLS_GCM_C)
621 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_GCM) {
622 return mbedtls_gcm_update((mbedtls_gcm_context *) ctx->cipher_ctx,
623 input, ilen,
624 output, ilen, olen);
625 }
626 #endif
627
628 #if defined(MBEDTLS_CCM_C)
629 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CCM_STAR_NO_TAG) {
630 return mbedtls_ccm_update((mbedtls_ccm_context *) ctx->cipher_ctx,
631 input, ilen,
632 output, ilen, olen);
633 }
634 #endif
635
636 #if defined(MBEDTLS_CHACHAPOLY_C)
637 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305) {
638 *olen = ilen;
639 return mbedtls_chachapoly_update((mbedtls_chachapoly_context *) ctx->cipher_ctx,
640 ilen, input, output);
641 }
642 #endif
643
644 if (input == output &&
645 (ctx->unprocessed_len != 0 || ilen % block_size)) {
646 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
647 }
648
649 #if defined(MBEDTLS_CIPHER_MODE_CBC)
650 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CBC) {
651 size_t copy_len = 0;
652
653 /*
654 * If there is not enough data for a full block, cache it.
655 */
656 if ((ctx->operation == MBEDTLS_DECRYPT && NULL != ctx->add_padding &&
657 ilen <= block_size - ctx->unprocessed_len) ||
658 (ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding &&
659 ilen < block_size - ctx->unprocessed_len) ||
660 (ctx->operation == MBEDTLS_ENCRYPT &&
661 ilen < block_size - ctx->unprocessed_len)) {
662 memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input,
663 ilen);
664
665 ctx->unprocessed_len += ilen;
666 return 0;
667 }
668
669 /*
670 * Process cached data first
671 */
672 if (0 != ctx->unprocessed_len) {
673 copy_len = block_size - ctx->unprocessed_len;
674
675 memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input,
676 copy_len);
677
678 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx,
679 ctx->operation,
680 block_size, ctx->iv,
681 ctx->
682 unprocessed_data,
683 output))) {
684 return ret;
685 }
686
687 *olen += block_size;
688 output += block_size;
689 ctx->unprocessed_len = 0;
690
691 input += copy_len;
692 ilen -= copy_len;
693 }
694
695 /*
696 * Cache final, incomplete block
697 */
698 if (0 != ilen) {
699 /* Encryption: only cache partial blocks
700 * Decryption w/ padding: always keep at least one whole block
701 * Decryption w/o padding: only cache partial blocks
702 */
703 copy_len = ilen % block_size;
704 if (copy_len == 0 &&
705 ctx->operation == MBEDTLS_DECRYPT &&
706 NULL != ctx->add_padding) {
707 copy_len = block_size;
708 }
709
710 memcpy(ctx->unprocessed_data, &(input[ilen - copy_len]),
711 copy_len);
712
713 ctx->unprocessed_len += copy_len;
714 ilen -= copy_len;
715 }
716
717 /*
718 * Process remaining full blocks
719 */
720 if (ilen) {
721 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx,
722 ctx->operation,
723 ilen, ctx->iv,
724 input,
725 output))) {
726 return ret;
727 }
728
729 *olen += ilen;
730 }
731
732 return 0;
733 }
734 #endif /* MBEDTLS_CIPHER_MODE_CBC */
735
736 #if defined(MBEDTLS_CIPHER_MODE_CFB)
737 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CFB) {
738 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cfb_func(ctx->cipher_ctx,
739 ctx->operation, ilen,
740 &ctx->unprocessed_len,
741 ctx->iv,
742 input, output))) {
743 return ret;
744 }
745
746 *olen = ilen;
747
748 return 0;
749 }
750 #endif /* MBEDTLS_CIPHER_MODE_CFB */
751
752 #if defined(MBEDTLS_CIPHER_MODE_OFB)
753 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_OFB) {
754 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ofb_func(ctx->cipher_ctx,
755 ilen,
756 &ctx->unprocessed_len,
757 ctx->iv,
758 input, output))) {
759 return ret;
760 }
761
762 *olen = ilen;
763
764 return 0;
765 }
766 #endif /* MBEDTLS_CIPHER_MODE_OFB */
767
768 #if defined(MBEDTLS_CIPHER_MODE_CTR)
769 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CTR) {
770 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ctr_func(ctx->cipher_ctx,
771 ilen,
772 &ctx->unprocessed_len,
773 ctx->iv,
774 ctx->unprocessed_data,
775 input, output))) {
776 return ret;
777 }
778
779 *olen = ilen;
780
781 return 0;
782 }
783 #endif /* MBEDTLS_CIPHER_MODE_CTR */
784
785 #if defined(MBEDTLS_CIPHER_MODE_XTS)
786 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_XTS) {
787 if (ctx->unprocessed_len > 0) {
788 /* We can only process an entire data unit at a time. */
789 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
790 }
791
792 ret = mbedtls_cipher_get_base(ctx->cipher_info)->xts_func(ctx->cipher_ctx,
793 ctx->operation,
794 ilen,
795 ctx->iv,
796 input,
797 output);
798 if (ret != 0) {
799 return ret;
800 }
801
802 *olen = ilen;
803
804 return 0;
805 }
806 #endif /* MBEDTLS_CIPHER_MODE_XTS */
807
808 #if defined(MBEDTLS_CIPHER_MODE_STREAM)
809 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_STREAM) {
810 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->stream_func(ctx->cipher_ctx,
811 ilen, input,
812 output))) {
813 return ret;
814 }
815
816 *olen = ilen;
817
818 return 0;
819 }
820 #endif /* MBEDTLS_CIPHER_MODE_STREAM */
821
822 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
823 }
824
825 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
826 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
827 /*
828 * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len
829 */
add_pkcs_padding(unsigned char * output,size_t output_len,size_t data_len)830 static void add_pkcs_padding(unsigned char *output, size_t output_len,
831 size_t data_len)
832 {
833 size_t padding_len = output_len - data_len;
834 unsigned char i;
835
836 for (i = 0; i < padding_len; i++) {
837 output[data_len + i] = (unsigned char) padding_len;
838 }
839 }
840
get_pkcs_padding(unsigned char * input,size_t input_len,size_t * data_len)841 static int get_pkcs_padding(unsigned char *input, size_t input_len,
842 size_t *data_len)
843 {
844 size_t i, pad_idx;
845 unsigned char padding_len;
846
847 if (NULL == input || NULL == data_len) {
848 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
849 }
850
851 padding_len = input[input_len - 1];
852 if (padding_len == 0 || padding_len > input_len) {
853 return MBEDTLS_ERR_CIPHER_INVALID_PADDING;
854 }
855 *data_len = input_len - padding_len;
856
857 mbedtls_ct_condition_t bad = mbedtls_ct_uint_gt(padding_len, input_len);
858 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0));
859
860 /* The number of bytes checked must be independent of padding_len,
861 * so pick input_len, which is usually 8 or 16 (one block) */
862 pad_idx = input_len - padding_len;
863 for (i = 0; i < input_len; i++) {
864 mbedtls_ct_condition_t in_padding = mbedtls_ct_uint_ge(i, pad_idx);
865 mbedtls_ct_condition_t different = mbedtls_ct_uint_ne(input[i], padding_len);
866 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_bool_and(in_padding, different));
867 }
868
869 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
870 }
871 #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */
872
873 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
874 /*
875 * One and zeros padding: fill with 80 00 ... 00
876 */
add_one_and_zeros_padding(unsigned char * output,size_t output_len,size_t data_len)877 static void add_one_and_zeros_padding(unsigned char *output,
878 size_t output_len, size_t data_len)
879 {
880 size_t padding_len = output_len - data_len;
881 unsigned char i = 0;
882
883 output[data_len] = 0x80;
884 for (i = 1; i < padding_len; i++) {
885 output[data_len + i] = 0x00;
886 }
887 }
888
get_one_and_zeros_padding(unsigned char * input,size_t input_len,size_t * data_len)889 static int get_one_and_zeros_padding(unsigned char *input, size_t input_len,
890 size_t *data_len)
891 {
892 if (NULL == input || NULL == data_len) {
893 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
894 }
895
896 mbedtls_ct_condition_t in_padding = MBEDTLS_CT_TRUE;
897 mbedtls_ct_condition_t bad = MBEDTLS_CT_TRUE;
898
899 *data_len = 0;
900
901 for (ptrdiff_t i = (ptrdiff_t) (input_len) - 1; i >= 0; i--) {
902 mbedtls_ct_condition_t is_nonzero = mbedtls_ct_bool(input[i]);
903
904 mbedtls_ct_condition_t hit_first_nonzero = mbedtls_ct_bool_and(is_nonzero, in_padding);
905
906 *data_len = mbedtls_ct_size_if(hit_first_nonzero, i, *data_len);
907
908 bad = mbedtls_ct_bool_if(hit_first_nonzero, mbedtls_ct_uint_ne(input[i], 0x80), bad);
909
910 in_padding = mbedtls_ct_bool_and(in_padding, mbedtls_ct_bool_not(is_nonzero));
911 }
912
913 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
914 }
915 #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */
916
917 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
918 /*
919 * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length
920 */
add_zeros_and_len_padding(unsigned char * output,size_t output_len,size_t data_len)921 static void add_zeros_and_len_padding(unsigned char *output,
922 size_t output_len, size_t data_len)
923 {
924 size_t padding_len = output_len - data_len;
925 unsigned char i = 0;
926
927 for (i = 1; i < padding_len; i++) {
928 output[data_len + i - 1] = 0x00;
929 }
930 output[output_len - 1] = (unsigned char) padding_len;
931 }
932
get_zeros_and_len_padding(unsigned char * input,size_t input_len,size_t * data_len)933 static int get_zeros_and_len_padding(unsigned char *input, size_t input_len,
934 size_t *data_len)
935 {
936 size_t i, pad_idx;
937 unsigned char padding_len;
938 mbedtls_ct_condition_t bad;
939
940 if (NULL == input || NULL == data_len) {
941 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
942 }
943
944 padding_len = input[input_len - 1];
945 *data_len = input_len - padding_len;
946
947 /* Avoid logical || since it results in a branch */
948 bad = mbedtls_ct_uint_gt(padding_len, input_len);
949 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0));
950
951 /* The number of bytes checked must be independent of padding_len */
952 pad_idx = input_len - padding_len;
953 for (i = 0; i < input_len - 1; i++) {
954 mbedtls_ct_condition_t is_padding = mbedtls_ct_uint_ge(i, pad_idx);
955 mbedtls_ct_condition_t nonzero_pad_byte;
956 nonzero_pad_byte = mbedtls_ct_bool_if_else_0(is_padding, mbedtls_ct_bool(input[i]));
957 bad = mbedtls_ct_bool_or(bad, nonzero_pad_byte);
958 }
959
960 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
961 }
962 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */
963
964 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
965 /*
966 * Zero padding: fill with 00 ... 00
967 */
add_zeros_padding(unsigned char * output,size_t output_len,size_t data_len)968 static void add_zeros_padding(unsigned char *output,
969 size_t output_len, size_t data_len)
970 {
971 memset(output + data_len, 0, output_len - data_len);
972 }
973
get_zeros_padding(unsigned char * input,size_t input_len,size_t * data_len)974 static int get_zeros_padding(unsigned char *input, size_t input_len,
975 size_t *data_len)
976 {
977 size_t i;
978 mbedtls_ct_condition_t done = MBEDTLS_CT_FALSE, prev_done;
979
980 if (NULL == input || NULL == data_len) {
981 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
982 }
983
984 *data_len = 0;
985 for (i = input_len; i > 0; i--) {
986 prev_done = done;
987 done = mbedtls_ct_bool_or(done, mbedtls_ct_uint_ne(input[i-1], 0));
988 *data_len = mbedtls_ct_size_if(mbedtls_ct_bool_ne(done, prev_done), i, *data_len);
989 }
990
991 return 0;
992 }
993 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */
994
995 /*
996 * No padding: don't pad :)
997 *
998 * There is no add_padding function (check for NULL in mbedtls_cipher_finish)
999 * but a trivial get_padding function
1000 */
get_no_padding(unsigned char * input,size_t input_len,size_t * data_len)1001 static int get_no_padding(unsigned char *input, size_t input_len,
1002 size_t *data_len)
1003 {
1004 if (NULL == input || NULL == data_len) {
1005 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1006 }
1007
1008 *data_len = input_len;
1009
1010 return 0;
1011 }
1012 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
1013
mbedtls_cipher_finish(mbedtls_cipher_context_t * ctx,unsigned char * output,size_t * olen)1014 int mbedtls_cipher_finish(mbedtls_cipher_context_t *ctx,
1015 unsigned char *output, size_t *olen)
1016 {
1017 if (ctx->cipher_info == NULL) {
1018 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1019 }
1020
1021 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1022 if (ctx->psa_enabled == 1) {
1023 /* While PSA Crypto has an API for multipart
1024 * operations, we currently don't make it
1025 * accessible through the cipher layer. */
1026 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1027 }
1028 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1029
1030 *olen = 0;
1031
1032 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
1033 /* CBC mode requires padding so we make sure a call to
1034 * mbedtls_cipher_set_padding_mode has been done successfully. */
1035 if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1036 if (ctx->get_padding == NULL) {
1037 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1038 }
1039 }
1040 #endif
1041
1042 if (MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1043 MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1044 MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1045 MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1046 MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1047 MBEDTLS_MODE_XTS == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1048 MBEDTLS_MODE_STREAM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1049 return 0;
1050 }
1051
1052 if ((MBEDTLS_CIPHER_CHACHA20 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) ||
1053 (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type))) {
1054 return 0;
1055 }
1056
1057 if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1058 if (ctx->unprocessed_len != 0) {
1059 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
1060 }
1061
1062 return 0;
1063 }
1064
1065 #if defined(MBEDTLS_CIPHER_MODE_CBC)
1066 if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1067 int ret = 0;
1068
1069 if (MBEDTLS_ENCRYPT == ctx->operation) {
1070 /* check for 'no padding' mode */
1071 if (NULL == ctx->add_padding) {
1072 if (0 != ctx->unprocessed_len) {
1073 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
1074 }
1075
1076 return 0;
1077 }
1078
1079 ctx->add_padding(ctx->unprocessed_data, mbedtls_cipher_get_iv_size(ctx),
1080 ctx->unprocessed_len);
1081 } else if (mbedtls_cipher_get_block_size(ctx) != ctx->unprocessed_len) {
1082 /*
1083 * For decrypt operations, expect a full block,
1084 * or an empty block if no padding
1085 */
1086 if (NULL == ctx->add_padding && 0 == ctx->unprocessed_len) {
1087 return 0;
1088 }
1089
1090 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
1091 }
1092
1093 /* cipher block */
1094 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx,
1095 ctx->operation,
1096 mbedtls_cipher_get_block_size(
1097 ctx),
1098 ctx->iv,
1099 ctx->unprocessed_data,
1100 output))) {
1101 return ret;
1102 }
1103
1104 /* Set output size for decryption */
1105 if (MBEDTLS_DECRYPT == ctx->operation) {
1106 return ctx->get_padding(output, mbedtls_cipher_get_block_size(ctx),
1107 olen);
1108 }
1109
1110 /* Set output size for encryption */
1111 *olen = mbedtls_cipher_get_block_size(ctx);
1112 return 0;
1113 }
1114 #else
1115 ((void) output);
1116 #endif /* MBEDTLS_CIPHER_MODE_CBC */
1117
1118 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1119 }
1120
1121 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t * ctx,mbedtls_cipher_padding_t mode)1122 int mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t *ctx,
1123 mbedtls_cipher_padding_t mode)
1124 {
1125 if (NULL == ctx->cipher_info ||
1126 MBEDTLS_MODE_CBC != ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1127 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1128 }
1129
1130 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1131 if (ctx->psa_enabled == 1) {
1132 /* While PSA Crypto knows about CBC padding
1133 * schemes, we currently don't make them
1134 * accessible through the cipher layer. */
1135 if (mode != MBEDTLS_PADDING_NONE) {
1136 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1137 }
1138
1139 return 0;
1140 }
1141 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1142
1143 switch (mode) {
1144 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
1145 case MBEDTLS_PADDING_PKCS7:
1146 ctx->add_padding = add_pkcs_padding;
1147 ctx->get_padding = get_pkcs_padding;
1148 break;
1149 #endif
1150 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
1151 case MBEDTLS_PADDING_ONE_AND_ZEROS:
1152 ctx->add_padding = add_one_and_zeros_padding;
1153 ctx->get_padding = get_one_and_zeros_padding;
1154 break;
1155 #endif
1156 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
1157 case MBEDTLS_PADDING_ZEROS_AND_LEN:
1158 ctx->add_padding = add_zeros_and_len_padding;
1159 ctx->get_padding = get_zeros_and_len_padding;
1160 break;
1161 #endif
1162 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
1163 case MBEDTLS_PADDING_ZEROS:
1164 ctx->add_padding = add_zeros_padding;
1165 ctx->get_padding = get_zeros_padding;
1166 break;
1167 #endif
1168 case MBEDTLS_PADDING_NONE:
1169 ctx->add_padding = NULL;
1170 ctx->get_padding = get_no_padding;
1171 break;
1172
1173 default:
1174 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1175 }
1176
1177 return 0;
1178 }
1179 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
1180
1181 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
mbedtls_cipher_write_tag(mbedtls_cipher_context_t * ctx,unsigned char * tag,size_t tag_len)1182 int mbedtls_cipher_write_tag(mbedtls_cipher_context_t *ctx,
1183 unsigned char *tag, size_t tag_len)
1184 {
1185 if (ctx->cipher_info == NULL) {
1186 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1187 }
1188
1189 if (MBEDTLS_ENCRYPT != ctx->operation) {
1190 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1191 }
1192
1193 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1194 if (ctx->psa_enabled == 1) {
1195 /* While PSA Crypto has an API for multipart
1196 * operations, we currently don't make it
1197 * accessible through the cipher layer. */
1198 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1199 }
1200 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1201
1202 #if defined(MBEDTLS_GCM_C)
1203 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1204 size_t output_length;
1205 /* The code here doesn't yet support alternative implementations
1206 * that can delay up to a block of output. */
1207 return mbedtls_gcm_finish((mbedtls_gcm_context *) ctx->cipher_ctx,
1208 NULL, 0, &output_length,
1209 tag, tag_len);
1210 }
1211 #endif
1212
1213 #if defined(MBEDTLS_CHACHAPOLY_C)
1214 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) {
1215 /* Don't allow truncated MAC for Poly1305 */
1216 if (tag_len != 16U) {
1217 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1218 }
1219
1220 return mbedtls_chachapoly_finish(
1221 (mbedtls_chachapoly_context *) ctx->cipher_ctx, tag);
1222 }
1223 #endif
1224
1225 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1226 }
1227
mbedtls_cipher_check_tag(mbedtls_cipher_context_t * ctx,const unsigned char * tag,size_t tag_len)1228 int mbedtls_cipher_check_tag(mbedtls_cipher_context_t *ctx,
1229 const unsigned char *tag, size_t tag_len)
1230 {
1231 unsigned char check_tag[16];
1232 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1233
1234 if (ctx->cipher_info == NULL) {
1235 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1236 }
1237
1238 if (MBEDTLS_DECRYPT != ctx->operation) {
1239 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1240 }
1241
1242 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1243 if (ctx->psa_enabled == 1) {
1244 /* While PSA Crypto has an API for multipart
1245 * operations, we currently don't make it
1246 * accessible through the cipher layer. */
1247 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1248 }
1249 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1250
1251 /* Status to return on a non-authenticated algorithm. */
1252 ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1253
1254 #if defined(MBEDTLS_GCM_C)
1255 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1256 size_t output_length;
1257 /* The code here doesn't yet support alternative implementations
1258 * that can delay up to a block of output. */
1259
1260 if (tag_len > sizeof(check_tag)) {
1261 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1262 }
1263
1264 if (0 != (ret = mbedtls_gcm_finish(
1265 (mbedtls_gcm_context *) ctx->cipher_ctx,
1266 NULL, 0, &output_length,
1267 check_tag, tag_len))) {
1268 return ret;
1269 }
1270
1271 /* Check the tag in "constant-time" */
1272 if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) {
1273 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1274 goto exit;
1275 }
1276 }
1277 #endif /* MBEDTLS_GCM_C */
1278
1279 #if defined(MBEDTLS_CHACHAPOLY_C)
1280 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) {
1281 /* Don't allow truncated MAC for Poly1305 */
1282 if (tag_len != sizeof(check_tag)) {
1283 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1284 }
1285
1286 ret = mbedtls_chachapoly_finish(
1287 (mbedtls_chachapoly_context *) ctx->cipher_ctx, check_tag);
1288 if (ret != 0) {
1289 return ret;
1290 }
1291
1292 /* Check the tag in "constant-time" */
1293 if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) {
1294 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1295 goto exit;
1296 }
1297 }
1298 #endif /* MBEDTLS_CHACHAPOLY_C */
1299
1300 exit:
1301 mbedtls_platform_zeroize(check_tag, tag_len);
1302 return ret;
1303 }
1304 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
1305
1306 /*
1307 * Packet-oriented wrapper for non-AEAD modes
1308 */
mbedtls_cipher_crypt(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len,const unsigned char * input,size_t ilen,unsigned char * output,size_t * olen)1309 int mbedtls_cipher_crypt(mbedtls_cipher_context_t *ctx,
1310 const unsigned char *iv, size_t iv_len,
1311 const unsigned char *input, size_t ilen,
1312 unsigned char *output, size_t *olen)
1313 {
1314 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1315 size_t finish_olen;
1316
1317 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1318 if (ctx->psa_enabled == 1) {
1319 /* As in the non-PSA case, we don't check that
1320 * a key has been set. If not, the key slot will
1321 * still be in its default state of 0, which is
1322 * guaranteed to be invalid, hence the PSA-call
1323 * below will gracefully fail. */
1324 mbedtls_cipher_context_psa * const cipher_psa =
1325 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1326
1327 psa_status_t status;
1328 psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT;
1329 size_t part_len;
1330
1331 if (ctx->operation == MBEDTLS_DECRYPT) {
1332 status = psa_cipher_decrypt_setup(&cipher_op,
1333 cipher_psa->slot,
1334 cipher_psa->alg);
1335 } else if (ctx->operation == MBEDTLS_ENCRYPT) {
1336 status = psa_cipher_encrypt_setup(&cipher_op,
1337 cipher_psa->slot,
1338 cipher_psa->alg);
1339 } else {
1340 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1341 }
1342
1343 /* In the following, we can immediately return on an error,
1344 * because the PSA Crypto API guarantees that cipher operations
1345 * are terminated by unsuccessful calls to psa_cipher_update(),
1346 * and by any call to psa_cipher_finish(). */
1347 if (status != PSA_SUCCESS) {
1348 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1349 }
1350
1351 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) != MBEDTLS_MODE_ECB) {
1352 status = psa_cipher_set_iv(&cipher_op, iv, iv_len);
1353 if (status != PSA_SUCCESS) {
1354 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1355 }
1356 }
1357
1358 status = psa_cipher_update(&cipher_op,
1359 input, ilen,
1360 output, ilen, olen);
1361 if (status != PSA_SUCCESS) {
1362 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1363 }
1364
1365 status = psa_cipher_finish(&cipher_op,
1366 output + *olen, ilen - *olen,
1367 &part_len);
1368 if (status != PSA_SUCCESS) {
1369 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1370 }
1371
1372 *olen += part_len;
1373 return 0;
1374 }
1375 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1376
1377 if ((ret = mbedtls_cipher_set_iv(ctx, iv, iv_len)) != 0) {
1378 return ret;
1379 }
1380
1381 if ((ret = mbedtls_cipher_reset(ctx)) != 0) {
1382 return ret;
1383 }
1384
1385 if ((ret = mbedtls_cipher_update(ctx, input, ilen,
1386 output, olen)) != 0) {
1387 return ret;
1388 }
1389
1390 if ((ret = mbedtls_cipher_finish(ctx, output + *olen,
1391 &finish_olen)) != 0) {
1392 return ret;
1393 }
1394
1395 *olen += finish_olen;
1396
1397 return 0;
1398 }
1399
1400 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1401 /*
1402 * Packet-oriented encryption for AEAD modes: internal function used by
1403 * mbedtls_cipher_auth_encrypt_ext().
1404 */
mbedtls_cipher_aead_encrypt(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len,const unsigned char * ad,size_t ad_len,const unsigned char * input,size_t ilen,unsigned char * output,size_t * olen,unsigned char * tag,size_t tag_len)1405 static int mbedtls_cipher_aead_encrypt(mbedtls_cipher_context_t *ctx,
1406 const unsigned char *iv, size_t iv_len,
1407 const unsigned char *ad, size_t ad_len,
1408 const unsigned char *input, size_t ilen,
1409 unsigned char *output, size_t *olen,
1410 unsigned char *tag, size_t tag_len)
1411 {
1412 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1413 if (ctx->psa_enabled == 1) {
1414 /* As in the non-PSA case, we don't check that
1415 * a key has been set. If not, the key slot will
1416 * still be in its default state of 0, which is
1417 * guaranteed to be invalid, hence the PSA-call
1418 * below will gracefully fail. */
1419 mbedtls_cipher_context_psa * const cipher_psa =
1420 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1421
1422 psa_status_t status;
1423
1424 /* PSA Crypto API always writes the authentication tag
1425 * at the end of the encrypted message. */
1426 if (output == NULL || tag != output + ilen) {
1427 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1428 }
1429
1430 status = psa_aead_encrypt(cipher_psa->slot,
1431 cipher_psa->alg,
1432 iv, iv_len,
1433 ad, ad_len,
1434 input, ilen,
1435 output, ilen + tag_len, olen);
1436 if (status != PSA_SUCCESS) {
1437 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1438 }
1439
1440 *olen -= tag_len;
1441 return 0;
1442 }
1443 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1444
1445 #if defined(MBEDTLS_GCM_C)
1446 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1447 *olen = ilen;
1448 return mbedtls_gcm_crypt_and_tag(ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT,
1449 ilen, iv, iv_len, ad, ad_len,
1450 input, output, tag_len, tag);
1451 }
1452 #endif /* MBEDTLS_GCM_C */
1453 #if defined(MBEDTLS_CCM_C)
1454 if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1455 *olen = ilen;
1456 return mbedtls_ccm_encrypt_and_tag(ctx->cipher_ctx, ilen,
1457 iv, iv_len, ad, ad_len, input, output,
1458 tag, tag_len);
1459 }
1460 #endif /* MBEDTLS_CCM_C */
1461 #if defined(MBEDTLS_CHACHAPOLY_C)
1462 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) {
1463 /* ChachaPoly has fixed length nonce and MAC (tag) */
1464 if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) ||
1465 (tag_len != 16U)) {
1466 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1467 }
1468
1469 *olen = ilen;
1470 return mbedtls_chachapoly_encrypt_and_tag(ctx->cipher_ctx,
1471 ilen, iv, ad, ad_len, input, output, tag);
1472 }
1473 #endif /* MBEDTLS_CHACHAPOLY_C */
1474
1475 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1476 }
1477
1478 /*
1479 * Packet-oriented encryption for AEAD modes: internal function used by
1480 * mbedtls_cipher_auth_encrypt_ext().
1481 */
mbedtls_cipher_aead_decrypt(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len,const unsigned char * ad,size_t ad_len,const unsigned char * input,size_t ilen,unsigned char * output,size_t * olen,const unsigned char * tag,size_t tag_len)1482 static int mbedtls_cipher_aead_decrypt(mbedtls_cipher_context_t *ctx,
1483 const unsigned char *iv, size_t iv_len,
1484 const unsigned char *ad, size_t ad_len,
1485 const unsigned char *input, size_t ilen,
1486 unsigned char *output, size_t *olen,
1487 const unsigned char *tag, size_t tag_len)
1488 {
1489 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1490 if (ctx->psa_enabled == 1) {
1491 /* As in the non-PSA case, we don't check that
1492 * a key has been set. If not, the key slot will
1493 * still be in its default state of 0, which is
1494 * guaranteed to be invalid, hence the PSA-call
1495 * below will gracefully fail. */
1496 mbedtls_cipher_context_psa * const cipher_psa =
1497 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1498
1499 psa_status_t status;
1500
1501 /* PSA Crypto API always writes the authentication tag
1502 * at the end of the encrypted message. */
1503 if (input == NULL || tag != input + ilen) {
1504 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1505 }
1506
1507 status = psa_aead_decrypt(cipher_psa->slot,
1508 cipher_psa->alg,
1509 iv, iv_len,
1510 ad, ad_len,
1511 input, ilen + tag_len,
1512 output, ilen, olen);
1513 if (status == PSA_ERROR_INVALID_SIGNATURE) {
1514 return MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1515 } else if (status != PSA_SUCCESS) {
1516 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
1517 }
1518
1519 return 0;
1520 }
1521 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
1522
1523 #if defined(MBEDTLS_GCM_C)
1524 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1525 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1526
1527 *olen = ilen;
1528 ret = mbedtls_gcm_auth_decrypt(ctx->cipher_ctx, ilen,
1529 iv, iv_len, ad, ad_len,
1530 tag, tag_len, input, output);
1531
1532 if (ret == MBEDTLS_ERR_GCM_AUTH_FAILED) {
1533 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1534 }
1535
1536 return ret;
1537 }
1538 #endif /* MBEDTLS_GCM_C */
1539 #if defined(MBEDTLS_CCM_C)
1540 if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
1541 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1542
1543 *olen = ilen;
1544 ret = mbedtls_ccm_auth_decrypt(ctx->cipher_ctx, ilen,
1545 iv, iv_len, ad, ad_len,
1546 input, output, tag, tag_len);
1547
1548 if (ret == MBEDTLS_ERR_CCM_AUTH_FAILED) {
1549 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1550 }
1551
1552 return ret;
1553 }
1554 #endif /* MBEDTLS_CCM_C */
1555 #if defined(MBEDTLS_CHACHAPOLY_C)
1556 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) {
1557 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1558
1559 /* ChachaPoly has fixed length nonce and MAC (tag) */
1560 if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) ||
1561 (tag_len != 16U)) {
1562 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1563 }
1564
1565 *olen = ilen;
1566 ret = mbedtls_chachapoly_auth_decrypt(ctx->cipher_ctx, ilen,
1567 iv, ad, ad_len, tag, input, output);
1568
1569 if (ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) {
1570 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1571 }
1572
1573 return ret;
1574 }
1575 #endif /* MBEDTLS_CHACHAPOLY_C */
1576
1577 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1578 }
1579 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1580
1581 #if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C)
1582 /*
1583 * Packet-oriented encryption for AEAD/NIST_KW: public function.
1584 */
mbedtls_cipher_auth_encrypt_ext(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len,const unsigned char * ad,size_t ad_len,const unsigned char * input,size_t ilen,unsigned char * output,size_t output_len,size_t * olen,size_t tag_len)1585 int mbedtls_cipher_auth_encrypt_ext(mbedtls_cipher_context_t *ctx,
1586 const unsigned char *iv, size_t iv_len,
1587 const unsigned char *ad, size_t ad_len,
1588 const unsigned char *input, size_t ilen,
1589 unsigned char *output, size_t output_len,
1590 size_t *olen, size_t tag_len)
1591 {
1592 #if defined(MBEDTLS_NIST_KW_C)
1593 if (
1594 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1595 ctx->psa_enabled == 0 &&
1596 #endif
1597 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1598 MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) {
1599 mbedtls_nist_kw_mode_t mode =
1600 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ?
1601 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
1602
1603 /* There is no iv, tag or ad associated with KW and KWP,
1604 * so these length should be 0 as documented. */
1605 if (iv_len != 0 || tag_len != 0 || ad_len != 0) {
1606 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1607 }
1608
1609 (void) iv;
1610 (void) ad;
1611
1612 return mbedtls_nist_kw_wrap(ctx->cipher_ctx, mode, input, ilen,
1613 output, olen, output_len);
1614 }
1615 #endif /* MBEDTLS_NIST_KW_C */
1616
1617 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1618 /* AEAD case: check length before passing on to shared function */
1619 if (output_len < ilen + tag_len) {
1620 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1621 }
1622
1623 int ret = mbedtls_cipher_aead_encrypt(ctx, iv, iv_len, ad, ad_len,
1624 input, ilen, output, olen,
1625 output + ilen, tag_len);
1626 *olen += tag_len;
1627 return ret;
1628 #else
1629 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1630 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1631 }
1632
1633 /*
1634 * Packet-oriented decryption for AEAD/NIST_KW: public function.
1635 */
mbedtls_cipher_auth_decrypt_ext(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len,const unsigned char * ad,size_t ad_len,const unsigned char * input,size_t ilen,unsigned char * output,size_t output_len,size_t * olen,size_t tag_len)1636 int mbedtls_cipher_auth_decrypt_ext(mbedtls_cipher_context_t *ctx,
1637 const unsigned char *iv, size_t iv_len,
1638 const unsigned char *ad, size_t ad_len,
1639 const unsigned char *input, size_t ilen,
1640 unsigned char *output, size_t output_len,
1641 size_t *olen, size_t tag_len)
1642 {
1643 #if defined(MBEDTLS_NIST_KW_C)
1644 if (
1645 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
1646 ctx->psa_enabled == 0 &&
1647 #endif
1648 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
1649 MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) {
1650 mbedtls_nist_kw_mode_t mode =
1651 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ?
1652 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
1653
1654 /* There is no iv, tag or ad associated with KW and KWP,
1655 * so these length should be 0 as documented. */
1656 if (iv_len != 0 || tag_len != 0 || ad_len != 0) {
1657 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1658 }
1659
1660 (void) iv;
1661 (void) ad;
1662
1663 return mbedtls_nist_kw_unwrap(ctx->cipher_ctx, mode, input, ilen,
1664 output, olen, output_len);
1665 }
1666 #endif /* MBEDTLS_NIST_KW_C */
1667
1668 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1669 /* AEAD case: check length before passing on to shared function */
1670 if (ilen < tag_len || output_len < ilen - tag_len) {
1671 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
1672 }
1673
1674 return mbedtls_cipher_aead_decrypt(ctx, iv, iv_len, ad, ad_len,
1675 input, ilen - tag_len, output, olen,
1676 input + ilen - tag_len, tag_len);
1677 #else
1678 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
1679 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1680 }
1681 #endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
1682
1683 #endif /* MBEDTLS_CIPHER_C */
1684
