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
10 *
11 * Licensed under the Apache License, Version 2.0 (the "License"); you may
12 * not use this file except in compliance with the License.
13 * You may obtain a copy of the License at
14 *
15 * http://www.apache.org/licenses/LICENSE-2.0
16 *
17 * Unless required by applicable law or agreed to in writing, software
18 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
19 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20 * See the License for the specific language governing permissions and
21 * limitations under the License.
22 */
23
24 #include "common.h"
25
26 #if defined(MBEDTLS_CIPHER_C)
27
28 #include "mbedtls/cipher.h"
29 #include "mbedtls/cipher_internal.h"
30 #include "mbedtls/platform_util.h"
31 #include "mbedtls/error.h"
32
33 #include <stdlib.h>
34 #include <string.h>
35
36 #if defined(MBEDTLS_CHACHAPOLY_C)
37 #include "mbedtls/chachapoly.h"
38 #endif
39
40 #if defined(MBEDTLS_GCM_C)
41 #include "mbedtls/gcm.h"
42 #endif
43
44 #if defined(MBEDTLS_CCM_C)
45 #include "mbedtls/ccm.h"
46 #endif
47
48 #if defined(MBEDTLS_CHACHA20_C)
49 #include "mbedtls/chacha20.h"
50 #endif
51
52 #if defined(MBEDTLS_CMAC_C)
53 #include "mbedtls/cmac.h"
54 #endif
55
56 #if defined(MBEDTLS_USE_PSA_CRYPTO)
57 #include "psa/crypto.h"
58 #include "mbedtls/psa_util.h"
59 #endif /* MBEDTLS_USE_PSA_CRYPTO */
60
61 #if defined(MBEDTLS_NIST_KW_C)
62 #include "mbedtls/nist_kw.h"
63 #endif
64
65 #if defined(MBEDTLS_PLATFORM_C)
66 #include "mbedtls/platform.h"
67 #else
68 #define mbedtls_calloc calloc
69 #define mbedtls_free free
70 #endif
71
72 #define CIPHER_VALIDATE_RET( cond ) \
73 MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA )
74 #define CIPHER_VALIDATE( cond ) \
75 MBEDTLS_INTERNAL_VALIDATE( cond )
76
77 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
78 /* Compare the contents of two buffers in constant time.
79 * Returns 0 if the contents are bitwise identical, otherwise returns
80 * a non-zero value.
81 * This is currently only used by GCM and ChaCha20+Poly1305.
82 */
mbedtls_constant_time_memcmp(const void * v1,const void * v2,size_t len)83 static int mbedtls_constant_time_memcmp( const void *v1, const void *v2,
84 size_t len )
85 {
86 const unsigned char *p1 = (const unsigned char*) v1;
87 const unsigned char *p2 = (const unsigned char*) v2;
88 size_t i;
89 unsigned char diff;
90
91 for( diff = 0, i = 0; i < len; i++ )
92 diff |= p1[i] ^ p2[i];
93
94 return( (int)diff );
95 }
96 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
97
98 static int supported_init = 0;
99
mbedtls_cipher_list(void)100 const int *mbedtls_cipher_list( void )
101 {
102 const mbedtls_cipher_definition_t *def;
103 int *type;
104
105 if( ! supported_init )
106 {
107 def = mbedtls_cipher_definitions;
108 type = mbedtls_cipher_supported;
109
110 while( def->type != 0 )
111 *type++ = (*def++).type;
112
113 *type = 0;
114
115 supported_init = 1;
116 }
117
118 return( mbedtls_cipher_supported );
119 }
120
mbedtls_cipher_info_from_type(const mbedtls_cipher_type_t cipher_type)121 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type(
122 const mbedtls_cipher_type_t cipher_type )
123 {
124 const mbedtls_cipher_definition_t *def;
125
126 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
127 if( def->type == cipher_type )
128 return( def->info );
129
130 return( NULL );
131 }
132
mbedtls_cipher_info_from_string(const char * cipher_name)133 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string(
134 const char *cipher_name )
135 {
136 const mbedtls_cipher_definition_t *def;
137
138 if( NULL == cipher_name )
139 return( NULL );
140
141 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
142 if( ! strcmp( def->info->name, cipher_name ) )
143 return( def->info );
144
145 return( NULL );
146 }
147
mbedtls_cipher_info_from_values(const mbedtls_cipher_id_t cipher_id,int key_bitlen,const mbedtls_cipher_mode_t mode)148 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values(
149 const mbedtls_cipher_id_t cipher_id,
150 int key_bitlen,
151 const mbedtls_cipher_mode_t mode )
152 {
153 const mbedtls_cipher_definition_t *def;
154
155 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
156 if( def->info->base->cipher == cipher_id &&
157 def->info->key_bitlen == (unsigned) key_bitlen &&
158 def->info->mode == mode )
159 return( def->info );
160
161 return( NULL );
162 }
163
mbedtls_cipher_init(mbedtls_cipher_context_t * ctx)164 void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx )
165 {
166 CIPHER_VALIDATE( ctx != NULL );
167 memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
168 }
169
mbedtls_cipher_free(mbedtls_cipher_context_t * ctx)170 void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx )
171 {
172 if( ctx == NULL )
173 return;
174
175 #if defined(MBEDTLS_USE_PSA_CRYPTO)
176 if( ctx->psa_enabled == 1 )
177 {
178 if( ctx->cipher_ctx != NULL )
179 {
180 mbedtls_cipher_context_psa * const cipher_psa =
181 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
182
183 if( cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED )
184 {
185 /* xxx_free() doesn't allow to return failures. */
186 (void) psa_destroy_key( cipher_psa->slot );
187 }
188
189 mbedtls_platform_zeroize( cipher_psa, sizeof( *cipher_psa ) );
190 mbedtls_free( cipher_psa );
191 }
192
193 mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
194 return;
195 }
196 #endif /* MBEDTLS_USE_PSA_CRYPTO */
197
198 #if defined(MBEDTLS_CMAC_C)
199 if( ctx->cmac_ctx )
200 {
201 mbedtls_platform_zeroize( ctx->cmac_ctx,
202 sizeof( mbedtls_cmac_context_t ) );
203 mbedtls_free( ctx->cmac_ctx );
204 }
205 #endif
206
207 if( ctx->cipher_ctx )
208 ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
209
210 mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
211 }
212
mbedtls_cipher_clone(mbedtls_cipher_context_t * dst,const mbedtls_cipher_context_t * src)213 int mbedtls_cipher_clone( mbedtls_cipher_context_t *dst,
214 const mbedtls_cipher_context_t *src )
215 {
216 if( dst == NULL || dst->cipher_info == NULL ||
217 src == NULL || src->cipher_info == NULL)
218 {
219 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
220 }
221
222 dst->cipher_info = src->cipher_info;
223 dst->key_bitlen = src->key_bitlen;
224 dst->operation = src->operation;
225 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
226 dst->add_padding = src->add_padding;
227 dst->get_padding = src->get_padding;
228 #endif
229 memcpy( dst->unprocessed_data, src->unprocessed_data, MBEDTLS_MAX_BLOCK_LENGTH );
230 dst->unprocessed_len = src->unprocessed_len;
231 memcpy( dst->iv, src->iv, MBEDTLS_MAX_IV_LENGTH );
232 dst->iv_size = src->iv_size;
233 if( dst->cipher_info->base->ctx_clone_func )
234 dst->cipher_info->base->ctx_clone_func( dst->cipher_ctx, src->cipher_ctx );
235
236 #if defined(MBEDTLS_CMAC_C)
237 if( dst->cmac_ctx != NULL && src->cmac_ctx != NULL )
238 memcpy( dst->cmac_ctx, src->cmac_ctx, sizeof( mbedtls_cmac_context_t ) );
239 #endif
240 return( 0 );
241 }
242
mbedtls_cipher_setup(mbedtls_cipher_context_t * ctx,const mbedtls_cipher_info_t * cipher_info)243 int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx,
244 const mbedtls_cipher_info_t *cipher_info )
245 {
246 CIPHER_VALIDATE_RET( ctx != NULL );
247 if( cipher_info == NULL )
248 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
249
250 memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
251
252 if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
253 return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
254
255 ctx->cipher_info = cipher_info;
256
257 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
258 /*
259 * Ignore possible errors caused by a cipher mode that doesn't use padding
260 */
261 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
262 (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 );
263 #else
264 (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE );
265 #endif
266 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
267
268 return( 0 );
269 }
270
271 #if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_cipher_setup_psa(mbedtls_cipher_context_t * ctx,const mbedtls_cipher_info_t * cipher_info,size_t taglen)272 int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx,
273 const mbedtls_cipher_info_t *cipher_info,
274 size_t taglen )
275 {
276 psa_algorithm_t alg;
277 mbedtls_cipher_context_psa *cipher_psa;
278
279 if( NULL == cipher_info || NULL == ctx )
280 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
281
282 /* Check that the underlying cipher mode and cipher type are
283 * supported by the underlying PSA Crypto implementation. */
284 alg = mbedtls_psa_translate_cipher_mode( cipher_info->mode, taglen );
285 if( alg == 0 )
286 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
287 if( mbedtls_psa_translate_cipher_type( cipher_info->type ) == 0 )
288 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
289
290 memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
291
292 cipher_psa = mbedtls_calloc( 1, sizeof(mbedtls_cipher_context_psa ) );
293 if( cipher_psa == NULL )
294 return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
295 cipher_psa->alg = alg;
296 ctx->cipher_ctx = cipher_psa;
297 ctx->cipher_info = cipher_info;
298 ctx->psa_enabled = 1;
299 return( 0 );
300 }
301 #endif /* MBEDTLS_USE_PSA_CRYPTO */
302
mbedtls_cipher_setup_info(mbedtls_cipher_context_t * ctx,const mbedtls_cipher_info_t * cipher_info)303 int mbedtls_cipher_setup_info( mbedtls_cipher_context_t *ctx, const mbedtls_cipher_info_t *cipher_info )
304 {
305 if( NULL == cipher_info || NULL == ctx )
306 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
307
308 ctx->cipher_info = cipher_info;
309 return( 0 );
310 }
311
mbedtls_cipher_setkey(mbedtls_cipher_context_t * ctx,const unsigned char * key,int key_bitlen,const mbedtls_operation_t operation)312 int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
313 const unsigned char *key,
314 int key_bitlen,
315 const mbedtls_operation_t operation )
316 {
317 CIPHER_VALIDATE_RET( ctx != NULL );
318 CIPHER_VALIDATE_RET( key != NULL );
319 CIPHER_VALIDATE_RET( operation == MBEDTLS_ENCRYPT ||
320 operation == MBEDTLS_DECRYPT );
321 if( ctx->cipher_info == NULL )
322 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
323
324 #if defined(MBEDTLS_USE_PSA_CRYPTO)
325 if( ctx->psa_enabled == 1 )
326 {
327 mbedtls_cipher_context_psa * const cipher_psa =
328 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
329
330 size_t const key_bytelen = ( (size_t) key_bitlen + 7 ) / 8;
331
332 psa_status_t status;
333 psa_key_type_t key_type;
334 psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
335
336 /* PSA Crypto API only accepts byte-aligned keys. */
337 if( key_bitlen % 8 != 0 )
338 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
339
340 /* Don't allow keys to be set multiple times. */
341 if( cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET )
342 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
343
344 key_type = mbedtls_psa_translate_cipher_type(
345 ctx->cipher_info->type );
346 if( key_type == 0 )
347 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
348 psa_set_key_type( &attributes, key_type );
349
350 /* Mbed TLS' cipher layer doesn't enforce the mode of operation
351 * (encrypt vs. decrypt): it is possible to setup a key for encryption
352 * and use it for AEAD decryption. Until tests relying on this
353 * are changed, allow any usage in PSA. */
354 psa_set_key_usage_flags( &attributes,
355 /* mbedtls_psa_translate_cipher_operation( operation ); */
356 PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
357 psa_set_key_algorithm( &attributes, cipher_psa->alg );
358
359 status = psa_import_key( &attributes, key, key_bytelen,
360 &cipher_psa->slot );
361 switch( status )
362 {
363 case PSA_SUCCESS:
364 break;
365 case PSA_ERROR_INSUFFICIENT_MEMORY:
366 return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
367 case PSA_ERROR_NOT_SUPPORTED:
368 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
369 default:
370 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
371 }
372 /* Indicate that we own the key slot and need to
373 * destroy it in mbedtls_cipher_free(). */
374 cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
375
376 ctx->key_bitlen = key_bitlen;
377 ctx->operation = operation;
378 return( 0 );
379 }
380 #endif /* MBEDTLS_USE_PSA_CRYPTO */
381
382 if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 &&
383 (int) ctx->cipher_info->key_bitlen != key_bitlen )
384 {
385 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
386 }
387
388 ctx->key_bitlen = key_bitlen;
389 ctx->operation = operation;
390
391 /*
392 * For OFB, CFB and CTR mode always use the encryption key schedule
393 */
394 if( MBEDTLS_ENCRYPT == operation ||
395 MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
396 MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
397 MBEDTLS_MODE_CTR == ctx->cipher_info->mode )
398 {
399 return( ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
400 ctx->key_bitlen ) );
401 }
402
403 if( MBEDTLS_DECRYPT == operation )
404 return( ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
405 ctx->key_bitlen ) );
406
407 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
408 }
409
mbedtls_cipher_set_iv(mbedtls_cipher_context_t * ctx,const unsigned char * iv,size_t iv_len)410 int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
411 const unsigned char *iv,
412 size_t iv_len )
413 {
414 size_t actual_iv_size;
415
416 CIPHER_VALIDATE_RET( ctx != NULL );
417 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
418 if( ctx->cipher_info == NULL )
419 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
420 #if defined(MBEDTLS_USE_PSA_CRYPTO)
421 if( ctx->psa_enabled == 1 )
422 {
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 */
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 if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN ) != 0 )
435 actual_iv_size = iv_len;
436 else
437 {
438 actual_iv_size = ctx->cipher_info->iv_size;
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 #if defined(MBEDTLS_CHACHA20_C)
446 if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
447 {
448 if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx,
449 iv,
450 0U ) ) /* Initial counter value */
451 {
452 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
453 }
454 }
455 #endif
456
457 if ( actual_iv_size != 0 )
458 {
459 memcpy( ctx->iv, iv, actual_iv_size );
460 ctx->iv_size = actual_iv_size;
461 }
462
463 return( 0 );
464 }
465
mbedtls_cipher_reset(mbedtls_cipher_context_t * ctx)466 int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx )
467 {
468 CIPHER_VALIDATE_RET( ctx != NULL );
469 if( ctx->cipher_info == NULL )
470 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
471
472 #if defined(MBEDTLS_USE_PSA_CRYPTO)
473 if( ctx->psa_enabled == 1 )
474 {
475 /* We don't support resetting PSA-based
476 * cipher contexts, yet. */
477 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
478 }
479 #endif /* MBEDTLS_USE_PSA_CRYPTO */
480
481 ctx->unprocessed_len = 0;
482
483 return( 0 );
484 }
485
486 #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)487 int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
488 const unsigned char *ad, size_t ad_len )
489 {
490 CIPHER_VALIDATE_RET( ctx != NULL );
491 CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL );
492 if( ctx->cipher_info == NULL )
493 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
494
495 #if defined(MBEDTLS_USE_PSA_CRYPTO)
496 if( ctx->psa_enabled == 1 )
497 {
498 /* While PSA Crypto has an API for multipart
499 * operations, we currently don't make it
500 * accessible through the cipher layer. */
501 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
502 }
503 #endif /* MBEDTLS_USE_PSA_CRYPTO */
504
505 #if defined(MBEDTLS_GCM_C)
506 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
507 {
508 return( mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation,
509 ctx->iv, ctx->iv_size, ad, ad_len ) );
510 }
511 #endif
512
513 #if defined(MBEDTLS_CHACHAPOLY_C)
514 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
515 {
516 int result;
517 mbedtls_chachapoly_mode_t mode;
518
519 mode = ( ctx->operation == MBEDTLS_ENCRYPT )
520 ? MBEDTLS_CHACHAPOLY_ENCRYPT
521 : MBEDTLS_CHACHAPOLY_DECRYPT;
522
523 result = mbedtls_chachapoly_starts( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
524 ctx->iv,
525 mode );
526 if ( result != 0 )
527 return( result );
528
529 return( mbedtls_chachapoly_update_aad( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
530 ad, ad_len ) );
531 }
532 #endif
533
534 return( 0 );
535 }
536 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
537
mbedtls_cipher_update(mbedtls_cipher_context_t * ctx,const unsigned char * input,size_t ilen,unsigned char * output,size_t * olen)538 int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
539 size_t ilen, unsigned char *output, size_t *olen )
540 {
541 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
542 size_t block_size;
543
544 CIPHER_VALIDATE_RET( ctx != NULL );
545 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
546 CIPHER_VALIDATE_RET( output != NULL );
547 CIPHER_VALIDATE_RET( olen != NULL );
548 if( ctx->cipher_info == NULL )
549 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
550
551 #if defined(MBEDTLS_USE_PSA_CRYPTO)
552 if( ctx->psa_enabled == 1 )
553 {
554 /* While PSA Crypto has an API for multipart
555 * operations, we currently don't make it
556 * accessible through the cipher layer. */
557 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
558 }
559 #endif /* MBEDTLS_USE_PSA_CRYPTO */
560
561 *olen = 0;
562 block_size = mbedtls_cipher_get_block_size( ctx );
563 if ( 0 == block_size )
564 {
565 return( MBEDTLS_ERR_CIPHER_INVALID_CONTEXT );
566 }
567
568 if( ctx->cipher_info->mode == MBEDTLS_MODE_ECB )
569 {
570 if( ilen != block_size )
571 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
572
573 *olen = ilen;
574
575 if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx,
576 ctx->operation, input, output ) ) )
577 {
578 return( ret );
579 }
580
581 return( 0 );
582 }
583
584 #if defined(MBEDTLS_GCM_C)
585 if( ctx->cipher_info->mode == MBEDTLS_MODE_GCM )
586 {
587 *olen = ilen;
588 return( mbedtls_gcm_update( (mbedtls_gcm_context *) ctx->cipher_ctx, ilen, input,
589 output ) );
590 }
591 #endif
592
593 #if defined(MBEDTLS_CHACHAPOLY_C)
594 if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
595 {
596 *olen = ilen;
597 return( mbedtls_chachapoly_update( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
598 ilen, input, output ) );
599 }
600 #endif
601
602 if( input == output &&
603 ( ctx->unprocessed_len != 0 || ilen % block_size ) )
604 {
605 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
606 }
607
608 #if defined(MBEDTLS_CIPHER_MODE_CBC)
609 if( ctx->cipher_info->mode == MBEDTLS_MODE_CBC )
610 {
611 size_t copy_len = 0;
612
613 /*
614 * If there is not enough data for a full block, cache it.
615 */
616 if( ( ctx->operation == MBEDTLS_DECRYPT && NULL != ctx->add_padding &&
617 ilen <= block_size - ctx->unprocessed_len ) ||
618 ( ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding &&
619 ilen < block_size - ctx->unprocessed_len ) ||
620 ( ctx->operation == MBEDTLS_ENCRYPT &&
621 ilen < block_size - ctx->unprocessed_len ) )
622 {
623 memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
624 ilen );
625
626 ctx->unprocessed_len += ilen;
627 return( 0 );
628 }
629
630 /*
631 * Process cached data first
632 */
633 if( 0 != ctx->unprocessed_len )
634 {
635 copy_len = block_size - ctx->unprocessed_len;
636
637 memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
638 copy_len );
639
640 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
641 ctx->operation, block_size, ctx->iv,
642 ctx->unprocessed_data, output ) ) )
643 {
644 return( ret );
645 }
646
647 *olen += block_size;
648 output += block_size;
649 ctx->unprocessed_len = 0;
650
651 input += copy_len;
652 ilen -= copy_len;
653 }
654
655 /*
656 * Cache final, incomplete block
657 */
658 if( 0 != ilen )
659 {
660 /* Encryption: only cache partial blocks
661 * Decryption w/ padding: always keep at least one whole block
662 * Decryption w/o padding: only cache partial blocks
663 */
664 copy_len = ilen % block_size;
665 if( copy_len == 0 &&
666 ctx->operation == MBEDTLS_DECRYPT &&
667 NULL != ctx->add_padding)
668 {
669 copy_len = block_size;
670 }
671
672 memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ),
673 copy_len );
674
675 ctx->unprocessed_len += copy_len;
676 ilen -= copy_len;
677 }
678
679 /*
680 * Process remaining full blocks
681 */
682 if( ilen )
683 {
684 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
685 ctx->operation, ilen, ctx->iv, input, output ) ) )
686 {
687 return( ret );
688 }
689
690 *olen += ilen;
691 }
692
693 return( 0 );
694 }
695 #endif /* MBEDTLS_CIPHER_MODE_CBC */
696
697 #if defined(MBEDTLS_CIPHER_MODE_CFB)
698 if( ctx->cipher_info->mode == MBEDTLS_MODE_CFB )
699 {
700 if( 0 != ( ret = ctx->cipher_info->base->cfb_func( ctx->cipher_ctx,
701 ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv,
702 input, output ) ) )
703 {
704 return( ret );
705 }
706
707 *olen = ilen;
708
709 return( 0 );
710 }
711 #endif /* MBEDTLS_CIPHER_MODE_CFB */
712
713 #if defined(MBEDTLS_CIPHER_MODE_OFB)
714 if( ctx->cipher_info->mode == MBEDTLS_MODE_OFB )
715 {
716 if( 0 != ( ret = ctx->cipher_info->base->ofb_func( ctx->cipher_ctx,
717 ilen, &ctx->unprocessed_len, ctx->iv, input, output ) ) )
718 {
719 return( ret );
720 }
721
722 *olen = ilen;
723
724 return( 0 );
725 }
726 #endif /* MBEDTLS_CIPHER_MODE_OFB */
727
728 #if defined(MBEDTLS_CIPHER_MODE_CTR)
729 if( ctx->cipher_info->mode == MBEDTLS_MODE_CTR )
730 {
731 if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx,
732 ilen, &ctx->unprocessed_len, ctx->iv,
733 ctx->unprocessed_data, input, output ) ) )
734 {
735 return( ret );
736 }
737
738 *olen = ilen;
739
740 return( 0 );
741 }
742 #endif /* MBEDTLS_CIPHER_MODE_CTR */
743
744 #if defined(MBEDTLS_CIPHER_MODE_XTS)
745 if( ctx->cipher_info->mode == MBEDTLS_MODE_XTS )
746 {
747 if( ctx->unprocessed_len > 0 ) {
748 /* We can only process an entire data unit at a time. */
749 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
750 }
751
752 ret = ctx->cipher_info->base->xts_func( ctx->cipher_ctx,
753 ctx->operation, ilen, ctx->iv, input, output );
754 if( ret != 0 )
755 {
756 return( ret );
757 }
758
759 *olen = ilen;
760
761 return( 0 );
762 }
763 #endif /* MBEDTLS_CIPHER_MODE_XTS */
764
765 #if defined(MBEDTLS_CIPHER_MODE_STREAM)
766 if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM )
767 {
768 if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx,
769 ilen, input, output ) ) )
770 {
771 return( ret );
772 }
773
774 *olen = ilen;
775
776 return( 0 );
777 }
778 #endif /* MBEDTLS_CIPHER_MODE_STREAM */
779
780 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
781 }
782
783 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
784 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
785 /*
786 * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len
787 */
add_pkcs_padding(unsigned char * output,size_t output_len,size_t data_len)788 static void add_pkcs_padding( unsigned char *output, size_t output_len,
789 size_t data_len )
790 {
791 size_t padding_len = output_len - data_len;
792 unsigned char i;
793
794 for( i = 0; i < padding_len; i++ )
795 output[data_len + i] = (unsigned char) padding_len;
796 }
797
get_pkcs_padding(unsigned char * input,size_t input_len,size_t * data_len)798 static int get_pkcs_padding( unsigned char *input, size_t input_len,
799 size_t *data_len )
800 {
801 size_t i, pad_idx;
802 unsigned char padding_len, bad = 0;
803
804 if( NULL == input || NULL == data_len )
805 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
806
807 padding_len = input[input_len - 1];
808 *data_len = input_len - padding_len;
809
810 /* Avoid logical || since it results in a branch */
811 bad |= padding_len > input_len;
812 bad |= padding_len == 0;
813
814 /* The number of bytes checked must be independent of padding_len,
815 * so pick input_len, which is usually 8 or 16 (one block) */
816 pad_idx = input_len - padding_len;
817 for( i = 0; i < input_len; i++ )
818 bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx );
819
820 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
821 }
822 #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */
823
824 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
825 /*
826 * One and zeros padding: fill with 80 00 ... 00
827 */
add_one_and_zeros_padding(unsigned char * output,size_t output_len,size_t data_len)828 static void add_one_and_zeros_padding( unsigned char *output,
829 size_t output_len, size_t data_len )
830 {
831 size_t padding_len = output_len - data_len;
832 unsigned char i = 0;
833
834 output[data_len] = 0x80;
835 for( i = 1; i < padding_len; i++ )
836 output[data_len + i] = 0x00;
837 }
838
get_one_and_zeros_padding(unsigned char * input,size_t input_len,size_t * data_len)839 static int get_one_and_zeros_padding( unsigned char *input, size_t input_len,
840 size_t *data_len )
841 {
842 size_t i;
843 unsigned char done = 0, prev_done, bad;
844
845 if( NULL == input || NULL == data_len )
846 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
847
848 bad = 0x80;
849 *data_len = 0;
850 for( i = input_len; i > 0; i-- )
851 {
852 prev_done = done;
853 done |= ( input[i - 1] != 0 );
854 *data_len |= ( i - 1 ) * ( done != prev_done );
855 bad ^= input[i - 1] * ( done != prev_done );
856 }
857
858 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
859
860 }
861 #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */
862
863 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
864 /*
865 * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length
866 */
add_zeros_and_len_padding(unsigned char * output,size_t output_len,size_t data_len)867 static void add_zeros_and_len_padding( unsigned char *output,
868 size_t output_len, size_t data_len )
869 {
870 size_t padding_len = output_len - data_len;
871 unsigned char i = 0;
872
873 for( i = 1; i < padding_len; i++ )
874 output[data_len + i - 1] = 0x00;
875 output[output_len - 1] = (unsigned char) padding_len;
876 }
877
get_zeros_and_len_padding(unsigned char * input,size_t input_len,size_t * data_len)878 static int get_zeros_and_len_padding( unsigned char *input, size_t input_len,
879 size_t *data_len )
880 {
881 size_t i, pad_idx;
882 unsigned char padding_len, bad = 0;
883
884 if( NULL == input || NULL == data_len )
885 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
886
887 padding_len = input[input_len - 1];
888 *data_len = input_len - padding_len;
889
890 /* Avoid logical || since it results in a branch */
891 bad |= padding_len > input_len;
892 bad |= padding_len == 0;
893
894 /* The number of bytes checked must be independent of padding_len */
895 pad_idx = input_len - padding_len;
896 for( i = 0; i < input_len - 1; i++ )
897 bad |= input[i] * ( i >= pad_idx );
898
899 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
900 }
901 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */
902
903 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
904 /*
905 * Zero padding: fill with 00 ... 00
906 */
add_zeros_padding(unsigned char * output,size_t output_len,size_t data_len)907 static void add_zeros_padding( unsigned char *output,
908 size_t output_len, size_t data_len )
909 {
910 size_t i;
911
912 for( i = data_len; i < output_len; i++ )
913 output[i] = 0x00;
914 }
915
get_zeros_padding(unsigned char * input,size_t input_len,size_t * data_len)916 static int get_zeros_padding( unsigned char *input, size_t input_len,
917 size_t *data_len )
918 {
919 size_t i;
920 unsigned char done = 0, prev_done;
921
922 if( NULL == input || NULL == data_len )
923 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
924
925 *data_len = 0;
926 for( i = input_len; i > 0; i-- )
927 {
928 prev_done = done;
929 done |= ( input[i-1] != 0 );
930 *data_len |= i * ( done != prev_done );
931 }
932
933 return( 0 );
934 }
935 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */
936
937 /*
938 * No padding: don't pad :)
939 *
940 * There is no add_padding function (check for NULL in mbedtls_cipher_finish)
941 * but a trivial get_padding function
942 */
get_no_padding(unsigned char * input,size_t input_len,size_t * data_len)943 static int get_no_padding( unsigned char *input, size_t input_len,
944 size_t *data_len )
945 {
946 if( NULL == input || NULL == data_len )
947 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
948
949 *data_len = input_len;
950
951 return( 0 );
952 }
953 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
954
mbedtls_cipher_finish(mbedtls_cipher_context_t * ctx,unsigned char * output,size_t * olen)955 int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
956 unsigned char *output, size_t *olen )
957 {
958 CIPHER_VALIDATE_RET( ctx != NULL );
959 CIPHER_VALIDATE_RET( output != NULL );
960 CIPHER_VALIDATE_RET( olen != NULL );
961 if( ctx->cipher_info == NULL )
962 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
963
964 #if defined(MBEDTLS_USE_PSA_CRYPTO)
965 if( ctx->psa_enabled == 1 )
966 {
967 /* While PSA Crypto has an API for multipart
968 * operations, we currently don't make it
969 * accessible through the cipher layer. */
970 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
971 }
972 #endif /* MBEDTLS_USE_PSA_CRYPTO */
973
974 *olen = 0;
975
976 if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
977 MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
978 MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
979 MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
980 MBEDTLS_MODE_XTS == ctx->cipher_info->mode ||
981 MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )
982 {
983 return( 0 );
984 }
985
986 if ( ( MBEDTLS_CIPHER_CHACHA20 == ctx->cipher_info->type ) ||
987 ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) )
988 {
989 return( 0 );
990 }
991
992 if( MBEDTLS_MODE_ECB == ctx->cipher_info->mode )
993 {
994 if( ctx->unprocessed_len != 0 )
995 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
996
997 return( 0 );
998 }
999
1000 #if defined(MBEDTLS_CIPHER_MODE_CBC)
1001 if( MBEDTLS_MODE_CBC == ctx->cipher_info->mode )
1002 {
1003 int ret = 0;
1004
1005 if( MBEDTLS_ENCRYPT == ctx->operation )
1006 {
1007 /* check for 'no padding' mode */
1008 if( NULL == ctx->add_padding )
1009 {
1010 if( 0 != ctx->unprocessed_len )
1011 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
1012
1013 return( 0 );
1014 }
1015
1016 ctx->add_padding( ctx->unprocessed_data, mbedtls_cipher_get_iv_size( ctx ),
1017 ctx->unprocessed_len );
1018 }
1019 else if( mbedtls_cipher_get_block_size( ctx ) != ctx->unprocessed_len )
1020 {
1021 /*
1022 * For decrypt operations, expect a full block,
1023 * or an empty block if no padding
1024 */
1025 if( NULL == ctx->add_padding && 0 == ctx->unprocessed_len )
1026 return( 0 );
1027
1028 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
1029 }
1030
1031 /* cipher block */
1032 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
1033 ctx->operation, mbedtls_cipher_get_block_size( ctx ), ctx->iv,
1034 ctx->unprocessed_data, output ) ) )
1035 {
1036 return( ret );
1037 }
1038
1039 /* Set output size for decryption */
1040 if( MBEDTLS_DECRYPT == ctx->operation )
1041 return( ctx->get_padding( output, mbedtls_cipher_get_block_size( ctx ),
1042 olen ) );
1043
1044 /* Set output size for encryption */
1045 *olen = mbedtls_cipher_get_block_size( ctx );
1046 return( 0 );
1047 }
1048 #else
1049 ((void) output);
1050 #endif /* MBEDTLS_CIPHER_MODE_CBC */
1051
1052 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1053 }
1054
1055 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t * ctx,mbedtls_cipher_padding_t mode)1056 int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx,
1057 mbedtls_cipher_padding_t mode )
1058 {
1059 CIPHER_VALIDATE_RET( ctx != NULL );
1060
1061 if( NULL == ctx->cipher_info || MBEDTLS_MODE_CBC != ctx->cipher_info->mode )
1062 {
1063 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1064 }
1065
1066 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1067 if( ctx->psa_enabled == 1 )
1068 {
1069 /* While PSA Crypto knows about CBC padding
1070 * schemes, we currently don't make them
1071 * accessible through the cipher layer. */
1072 if( mode != MBEDTLS_PADDING_NONE )
1073 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1074
1075 return( 0 );
1076 }
1077 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1078
1079 switch( mode )
1080 {
1081 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
1082 case MBEDTLS_PADDING_PKCS7:
1083 ctx->add_padding = add_pkcs_padding;
1084 ctx->get_padding = get_pkcs_padding;
1085 break;
1086 #endif
1087 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
1088 case MBEDTLS_PADDING_ONE_AND_ZEROS:
1089 ctx->add_padding = add_one_and_zeros_padding;
1090 ctx->get_padding = get_one_and_zeros_padding;
1091 break;
1092 #endif
1093 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
1094 case MBEDTLS_PADDING_ZEROS_AND_LEN:
1095 ctx->add_padding = add_zeros_and_len_padding;
1096 ctx->get_padding = get_zeros_and_len_padding;
1097 break;
1098 #endif
1099 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
1100 case MBEDTLS_PADDING_ZEROS:
1101 ctx->add_padding = add_zeros_padding;
1102 ctx->get_padding = get_zeros_padding;
1103 break;
1104 #endif
1105 case MBEDTLS_PADDING_NONE:
1106 ctx->add_padding = NULL;
1107 ctx->get_padding = get_no_padding;
1108 break;
1109
1110 default:
1111 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1112 }
1113
1114 return( 0 );
1115 }
1116 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
1117
1118 #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)1119 int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
1120 unsigned char *tag, size_t tag_len )
1121 {
1122 CIPHER_VALIDATE_RET( ctx != NULL );
1123 CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL );
1124 if( ctx->cipher_info == NULL )
1125 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1126
1127 if( MBEDTLS_ENCRYPT != ctx->operation )
1128 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1129
1130 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1131 if( ctx->psa_enabled == 1 )
1132 {
1133 /* While PSA Crypto has an API for multipart
1134 * operations, we currently don't make it
1135 * accessible through the cipher layer. */
1136 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1137 }
1138 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1139
1140 #if defined(MBEDTLS_GCM_C)
1141 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
1142 return( mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx,
1143 tag, tag_len ) );
1144 #endif
1145
1146 #if defined(MBEDTLS_CHACHAPOLY_C)
1147 if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
1148 {
1149 /* Don't allow truncated MAC for Poly1305 */
1150 if ( tag_len != 16U )
1151 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1152
1153 return( mbedtls_chachapoly_finish(
1154 (mbedtls_chachapoly_context*) ctx->cipher_ctx, tag ) );
1155 }
1156 #endif
1157
1158 return( 0 );
1159 }
1160
mbedtls_cipher_check_tag(mbedtls_cipher_context_t * ctx,const unsigned char * tag,size_t tag_len)1161 int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
1162 const unsigned char *tag, size_t tag_len )
1163 {
1164 unsigned char check_tag[16];
1165 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1166
1167 CIPHER_VALIDATE_RET( ctx != NULL );
1168 CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL );
1169 if( ctx->cipher_info == NULL )
1170 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1171
1172 if( MBEDTLS_DECRYPT != ctx->operation )
1173 {
1174 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1175 }
1176
1177 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1178 if( ctx->psa_enabled == 1 )
1179 {
1180 /* While PSA Crypto has an API for multipart
1181 * operations, we currently don't make it
1182 * accessible through the cipher layer. */
1183 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1184 }
1185 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1186
1187 #if defined(MBEDTLS_GCM_C)
1188 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
1189 {
1190 if( tag_len > sizeof( check_tag ) )
1191 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1192
1193 if( 0 != ( ret = mbedtls_gcm_finish(
1194 (mbedtls_gcm_context *) ctx->cipher_ctx,
1195 check_tag, tag_len ) ) )
1196 {
1197 return( ret );
1198 }
1199
1200 /* Check the tag in "constant-time" */
1201 if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 )
1202 return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
1203
1204 return( 0 );
1205 }
1206 #endif /* MBEDTLS_GCM_C */
1207
1208 #if defined(MBEDTLS_CHACHAPOLY_C)
1209 if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
1210 {
1211 /* Don't allow truncated MAC for Poly1305 */
1212 if ( tag_len != sizeof( check_tag ) )
1213 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1214
1215 ret = mbedtls_chachapoly_finish(
1216 (mbedtls_chachapoly_context*) ctx->cipher_ctx, check_tag );
1217 if ( ret != 0 )
1218 {
1219 return( ret );
1220 }
1221
1222 /* Check the tag in "constant-time" */
1223 if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 )
1224 return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
1225
1226 return( 0 );
1227 }
1228 #endif /* MBEDTLS_CHACHAPOLY_C */
1229
1230 return( 0 );
1231 }
1232 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
1233
1234 /*
1235 * Packet-oriented wrapper for non-AEAD modes
1236 */
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)1237 int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
1238 const unsigned char *iv, size_t iv_len,
1239 const unsigned char *input, size_t ilen,
1240 unsigned char *output, size_t *olen )
1241 {
1242 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1243 size_t finish_olen;
1244
1245 CIPHER_VALIDATE_RET( ctx != NULL );
1246 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
1247 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
1248 CIPHER_VALIDATE_RET( output != NULL );
1249 CIPHER_VALIDATE_RET( olen != NULL );
1250
1251 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1252 if( ctx->psa_enabled == 1 )
1253 {
1254 /* As in the non-PSA case, we don't check that
1255 * a key has been set. If not, the key slot will
1256 * still be in its default state of 0, which is
1257 * guaranteed to be invalid, hence the PSA-call
1258 * below will gracefully fail. */
1259 mbedtls_cipher_context_psa * const cipher_psa =
1260 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1261
1262 psa_status_t status;
1263 psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT;
1264 size_t part_len;
1265
1266 if( ctx->operation == MBEDTLS_DECRYPT )
1267 {
1268 status = psa_cipher_decrypt_setup( &cipher_op,
1269 cipher_psa->slot,
1270 cipher_psa->alg );
1271 }
1272 else if( ctx->operation == MBEDTLS_ENCRYPT )
1273 {
1274 status = psa_cipher_encrypt_setup( &cipher_op,
1275 cipher_psa->slot,
1276 cipher_psa->alg );
1277 }
1278 else
1279 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1280
1281 /* In the following, we can immediately return on an error,
1282 * because the PSA Crypto API guarantees that cipher operations
1283 * are terminated by unsuccessful calls to psa_cipher_update(),
1284 * and by any call to psa_cipher_finish(). */
1285 if( status != PSA_SUCCESS )
1286 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1287
1288 status = psa_cipher_set_iv( &cipher_op, iv, iv_len );
1289 if( status != PSA_SUCCESS )
1290 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1291
1292 status = psa_cipher_update( &cipher_op,
1293 input, ilen,
1294 output, ilen, olen );
1295 if( status != PSA_SUCCESS )
1296 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1297
1298 status = psa_cipher_finish( &cipher_op,
1299 output + *olen, ilen - *olen,
1300 &part_len );
1301 if( status != PSA_SUCCESS )
1302 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1303
1304 *olen += part_len;
1305 return( 0 );
1306 }
1307 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1308
1309 if( ( ret = mbedtls_cipher_set_iv( ctx, iv, iv_len ) ) != 0 )
1310 return( ret );
1311
1312 if( ( ret = mbedtls_cipher_reset( ctx ) ) != 0 )
1313 return( ret );
1314
1315 if( ( ret = mbedtls_cipher_update( ctx, input, ilen,
1316 output, olen ) ) != 0 )
1317 return( ret );
1318
1319 if( ( ret = mbedtls_cipher_finish( ctx, output + *olen,
1320 &finish_olen ) ) != 0 )
1321 return( ret );
1322
1323 *olen += finish_olen;
1324
1325 return( 0 );
1326 }
1327
1328 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1329 /*
1330 * Packet-oriented encryption for AEAD modes: internal function shared by
1331 * mbedtls_cipher_auth_encrypt() and mbedtls_cipher_auth_encrypt_ext().
1332 */
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)1333 static int mbedtls_cipher_aead_encrypt( mbedtls_cipher_context_t *ctx,
1334 const unsigned char *iv, size_t iv_len,
1335 const unsigned char *ad, size_t ad_len,
1336 const unsigned char *input, size_t ilen,
1337 unsigned char *output, size_t *olen,
1338 unsigned char *tag, size_t tag_len )
1339 {
1340 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1341 if( ctx->psa_enabled == 1 )
1342 {
1343 /* As in the non-PSA case, we don't check that
1344 * a key has been set. If not, the key slot will
1345 * still be in its default state of 0, which is
1346 * guaranteed to be invalid, hence the PSA-call
1347 * below will gracefully fail. */
1348 mbedtls_cipher_context_psa * const cipher_psa =
1349 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1350
1351 psa_status_t status;
1352
1353 /* PSA Crypto API always writes the authentication tag
1354 * at the end of the encrypted message. */
1355 if( output == NULL || tag != output + ilen )
1356 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1357
1358 status = psa_aead_encrypt( cipher_psa->slot,
1359 cipher_psa->alg,
1360 iv, iv_len,
1361 ad, ad_len,
1362 input, ilen,
1363 output, ilen + tag_len, olen );
1364 if( status != PSA_SUCCESS )
1365 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1366
1367 *olen -= tag_len;
1368 return( 0 );
1369 }
1370 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1371
1372 #if defined(MBEDTLS_GCM_C)
1373 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
1374 {
1375 *olen = ilen;
1376 return( mbedtls_gcm_crypt_and_tag( ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT,
1377 ilen, iv, iv_len, ad, ad_len,
1378 input, output, tag_len, tag ) );
1379 }
1380 #endif /* MBEDTLS_GCM_C */
1381 #if defined(MBEDTLS_CCM_C)
1382 if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
1383 {
1384 *olen = ilen;
1385 return( mbedtls_ccm_encrypt_and_tag( ctx->cipher_ctx, ilen,
1386 iv, iv_len, ad, ad_len, input, output,
1387 tag, tag_len ) );
1388 }
1389 #endif /* MBEDTLS_CCM_C */
1390 #if defined(MBEDTLS_CHACHAPOLY_C)
1391 if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
1392 {
1393 /* ChachaPoly has fixed length nonce and MAC (tag) */
1394 if ( ( iv_len != ctx->cipher_info->iv_size ) ||
1395 ( tag_len != 16U ) )
1396 {
1397 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1398 }
1399
1400 *olen = ilen;
1401 return( mbedtls_chachapoly_encrypt_and_tag( ctx->cipher_ctx,
1402 ilen, iv, ad, ad_len, input, output, tag ) );
1403 }
1404 #endif /* MBEDTLS_CHACHAPOLY_C */
1405
1406 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1407 }
1408
1409 /*
1410 * Packet-oriented encryption for AEAD modes: internal function shared by
1411 * mbedtls_cipher_auth_encrypt() and mbedtls_cipher_auth_encrypt_ext().
1412 */
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)1413 static int mbedtls_cipher_aead_decrypt( mbedtls_cipher_context_t *ctx,
1414 const unsigned char *iv, size_t iv_len,
1415 const unsigned char *ad, size_t ad_len,
1416 const unsigned char *input, size_t ilen,
1417 unsigned char *output, size_t *olen,
1418 const unsigned char *tag, size_t tag_len )
1419 {
1420 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1421 if( ctx->psa_enabled == 1 )
1422 {
1423 /* As in the non-PSA case, we don't check that
1424 * a key has been set. If not, the key slot will
1425 * still be in its default state of 0, which is
1426 * guaranteed to be invalid, hence the PSA-call
1427 * below will gracefully fail. */
1428 mbedtls_cipher_context_psa * const cipher_psa =
1429 (mbedtls_cipher_context_psa *) ctx->cipher_ctx;
1430
1431 psa_status_t status;
1432
1433 /* PSA Crypto API always writes the authentication tag
1434 * at the end of the encrypted message. */
1435 if( input == NULL || tag != input + ilen )
1436 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1437
1438 status = psa_aead_decrypt( cipher_psa->slot,
1439 cipher_psa->alg,
1440 iv, iv_len,
1441 ad, ad_len,
1442 input, ilen + tag_len,
1443 output, ilen, olen );
1444 if( status == PSA_ERROR_INVALID_SIGNATURE )
1445 return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
1446 else if( status != PSA_SUCCESS )
1447 return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
1448
1449 return( 0 );
1450 }
1451 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1452
1453 #if defined(MBEDTLS_GCM_C)
1454 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
1455 {
1456 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1457
1458 *olen = ilen;
1459 ret = mbedtls_gcm_auth_decrypt( ctx->cipher_ctx, ilen,
1460 iv, iv_len, ad, ad_len,
1461 tag, tag_len, input, output );
1462
1463 if( ret == MBEDTLS_ERR_GCM_AUTH_FAILED )
1464 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1465
1466 return( ret );
1467 }
1468 #endif /* MBEDTLS_GCM_C */
1469 #if defined(MBEDTLS_CCM_C)
1470 if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
1471 {
1472 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1473
1474 *olen = ilen;
1475 ret = mbedtls_ccm_auth_decrypt( ctx->cipher_ctx, ilen,
1476 iv, iv_len, ad, ad_len,
1477 input, output, tag, tag_len );
1478
1479 if( ret == MBEDTLS_ERR_CCM_AUTH_FAILED )
1480 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1481
1482 return( ret );
1483 }
1484 #endif /* MBEDTLS_CCM_C */
1485 #if defined(MBEDTLS_CHACHAPOLY_C)
1486 if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
1487 {
1488 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1489
1490 /* ChachaPoly has fixed length nonce and MAC (tag) */
1491 if ( ( iv_len != ctx->cipher_info->iv_size ) ||
1492 ( tag_len != 16U ) )
1493 {
1494 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1495 }
1496
1497 *olen = ilen;
1498 ret = mbedtls_chachapoly_auth_decrypt( ctx->cipher_ctx, ilen,
1499 iv, ad, ad_len, tag, input, output );
1500
1501 if( ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED )
1502 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
1503
1504 return( ret );
1505 }
1506 #endif /* MBEDTLS_CHACHAPOLY_C */
1507
1508 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1509 }
1510
1511 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
1512 /*
1513 * Packet-oriented encryption for AEAD modes: public legacy function.
1514 */
mbedtls_cipher_auth_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)1515 int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
1516 const unsigned char *iv, size_t iv_len,
1517 const unsigned char *ad, size_t ad_len,
1518 const unsigned char *input, size_t ilen,
1519 unsigned char *output, size_t *olen,
1520 unsigned char *tag, size_t tag_len )
1521 {
1522 CIPHER_VALIDATE_RET( ctx != NULL );
1523 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
1524 CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL );
1525 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
1526 CIPHER_VALIDATE_RET( ilen == 0 || output != NULL );
1527 CIPHER_VALIDATE_RET( olen != NULL );
1528 CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL );
1529
1530 return( mbedtls_cipher_aead_encrypt( ctx, iv, iv_len, ad, ad_len,
1531 input, ilen, output, olen,
1532 tag, tag_len ) );
1533 }
1534
1535 /*
1536 * Packet-oriented decryption for AEAD modes: public legacy function.
1537 */
mbedtls_cipher_auth_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)1538 int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
1539 const unsigned char *iv, size_t iv_len,
1540 const unsigned char *ad, size_t ad_len,
1541 const unsigned char *input, size_t ilen,
1542 unsigned char *output, size_t *olen,
1543 const unsigned char *tag, size_t tag_len )
1544 {
1545 CIPHER_VALIDATE_RET( ctx != NULL );
1546 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
1547 CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL );
1548 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
1549 CIPHER_VALIDATE_RET( ilen == 0 || output != NULL );
1550 CIPHER_VALIDATE_RET( olen != NULL );
1551 CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL );
1552
1553 return( mbedtls_cipher_aead_decrypt( ctx, iv, iv_len, ad, ad_len,
1554 input, ilen, output, olen,
1555 tag, tag_len ) );
1556 }
1557 #endif /* !MBEDTLS_DEPRECATED_REMOVED */
1558 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1559
1560 #if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C)
1561 /*
1562 * Packet-oriented encryption for AEAD/NIST_KW: public function.
1563 */
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)1564 int mbedtls_cipher_auth_encrypt_ext( mbedtls_cipher_context_t *ctx,
1565 const unsigned char *iv, size_t iv_len,
1566 const unsigned char *ad, size_t ad_len,
1567 const unsigned char *input, size_t ilen,
1568 unsigned char *output, size_t output_len,
1569 size_t *olen, size_t tag_len )
1570 {
1571 CIPHER_VALIDATE_RET( ctx != NULL );
1572 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
1573 CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL );
1574 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
1575 CIPHER_VALIDATE_RET( output != NULL );
1576 CIPHER_VALIDATE_RET( olen != NULL );
1577
1578 #if defined(MBEDTLS_NIST_KW_C)
1579 if(
1580 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1581 ctx->psa_enabled == 0 &&
1582 #endif
1583 ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ||
1584 MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) )
1585 {
1586 mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ) ?
1587 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
1588
1589 /* There is no iv, tag or ad associated with KW and KWP,
1590 * so these length should be 0 as documented. */
1591 if( iv_len != 0 || tag_len != 0 || ad_len != 0 )
1592 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1593
1594 (void) iv;
1595 (void) ad;
1596
1597 return( mbedtls_nist_kw_wrap( ctx->cipher_ctx, mode, input, ilen,
1598 output, olen, output_len ) );
1599 }
1600 #endif /* MBEDTLS_NIST_KW_C */
1601
1602 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1603 /* AEAD case: check length before passing on to shared function */
1604 if( output_len < ilen + tag_len )
1605 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1606
1607 int ret = mbedtls_cipher_aead_encrypt( ctx, iv, iv_len, ad, ad_len,
1608 input, ilen, output, olen,
1609 output + ilen, tag_len );
1610 *olen += tag_len;
1611 return( ret );
1612 #else
1613 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1614 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1615 }
1616
1617 /*
1618 * Packet-oriented decryption for AEAD/NIST_KW: public function.
1619 */
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)1620 int mbedtls_cipher_auth_decrypt_ext( mbedtls_cipher_context_t *ctx,
1621 const unsigned char *iv, size_t iv_len,
1622 const unsigned char *ad, size_t ad_len,
1623 const unsigned char *input, size_t ilen,
1624 unsigned char *output, size_t output_len,
1625 size_t *olen, size_t tag_len )
1626 {
1627 CIPHER_VALIDATE_RET( ctx != NULL );
1628 CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL );
1629 CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL );
1630 CIPHER_VALIDATE_RET( ilen == 0 || input != NULL );
1631 CIPHER_VALIDATE_RET( output_len == 0 || output != NULL );
1632 CIPHER_VALIDATE_RET( olen != NULL );
1633
1634 #if defined(MBEDTLS_NIST_KW_C)
1635 if(
1636 #if defined(MBEDTLS_USE_PSA_CRYPTO)
1637 ctx->psa_enabled == 0 &&
1638 #endif
1639 ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ||
1640 MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) )
1641 {
1642 mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ) ?
1643 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
1644
1645 /* There is no iv, tag or ad associated with KW and KWP,
1646 * so these length should be 0 as documented. */
1647 if( iv_len != 0 || tag_len != 0 || ad_len != 0 )
1648 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1649
1650 (void) iv;
1651 (void) ad;
1652
1653 return( mbedtls_nist_kw_unwrap( ctx->cipher_ctx, mode, input, ilen,
1654 output, olen, output_len ) );
1655 }
1656 #endif /* MBEDTLS_NIST_KW_C */
1657
1658 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
1659 /* AEAD case: check length before passing on to shared function */
1660 if( ilen < tag_len || output_len < ilen - tag_len )
1661 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
1662
1663 return( mbedtls_cipher_aead_decrypt( ctx, iv, iv_len, ad, ad_len,
1664 input, ilen - tag_len, output, olen,
1665 input + ilen - tag_len, tag_len ) );
1666 #else
1667 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
1668 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
1669 }
1670 #endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
1671
1672 #endif /* MBEDTLS_CIPHER_C */
1673