1 /*
2 * PSA RSA layer on top of Mbed TLS crypto
3 */
4 /*
5 * Copyright The Mbed TLS Contributors
6 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
7 */
8
9 #include "common.h"
10
11 #if defined(MBEDTLS_PSA_CRYPTO_C)
12
13 #include <psa/crypto.h>
14 #include "psa/crypto_values.h"
15 #include "psa_crypto_core.h"
16 #include "psa_crypto_random_impl.h"
17 #include "psa_crypto_rsa.h"
18 #include "psa_crypto_hash.h"
19 #include "md_psa.h"
20
21 #include <stdlib.h>
22 #include <string.h>
23 #include "mbedtls/platform.h"
24
25 #include <mbedtls/rsa.h>
26 #include <mbedtls/error.h>
27 #include <mbedtls/pk.h>
28 #include "pk_wrap.h"
29
30 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
31 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) || \
32 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
33 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) || \
34 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) || \
35 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || \
36 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
37
38 /* Mbed TLS doesn't support non-byte-aligned key sizes (i.e. key sizes
39 * that are not a multiple of 8) well. For example, there is only
40 * mbedtls_rsa_get_len(), which returns a number of bytes, and no
41 * way to return the exact bit size of a key.
42 * To keep things simple, reject non-byte-aligned key sizes. */
psa_check_rsa_key_byte_aligned(const mbedtls_rsa_context * rsa)43 static psa_status_t psa_check_rsa_key_byte_aligned(
44 const mbedtls_rsa_context *rsa)
45 {
46 mbedtls_mpi n;
47 psa_status_t status;
48 mbedtls_mpi_init(&n);
49 status = mbedtls_to_psa_error(
50 mbedtls_rsa_export(rsa, &n, NULL, NULL, NULL, NULL));
51 if (status == PSA_SUCCESS) {
52 if (mbedtls_mpi_bitlen(&n) % 8 != 0) {
53 status = PSA_ERROR_NOT_SUPPORTED;
54 }
55 }
56 mbedtls_mpi_free(&n);
57 return status;
58 }
59
mbedtls_psa_rsa_load_representation(psa_key_type_t type,const uint8_t * data,size_t data_length,mbedtls_rsa_context ** p_rsa)60 psa_status_t mbedtls_psa_rsa_load_representation(
61 psa_key_type_t type, const uint8_t *data, size_t data_length,
62 mbedtls_rsa_context **p_rsa)
63 {
64 psa_status_t status;
65 mbedtls_pk_context ctx;
66 size_t bits;
67 mbedtls_pk_init(&ctx);
68
69 /* Parse the data. */
70 if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) {
71 status = mbedtls_to_psa_error(
72 mbedtls_pk_parse_key(&ctx, data, data_length, NULL, 0,
73 mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE));
74 } else {
75 status = mbedtls_to_psa_error(
76 mbedtls_pk_parse_public_key(&ctx, data, data_length));
77 }
78 if (status != PSA_SUCCESS) {
79 goto exit;
80 }
81
82 /* We have something that the pkparse module recognizes. If it is a
83 * valid RSA key, store it. */
84 if (mbedtls_pk_get_type(&ctx) != MBEDTLS_PK_RSA) {
85 status = PSA_ERROR_INVALID_ARGUMENT;
86 goto exit;
87 }
88
89 /* The size of an RSA key doesn't have to be a multiple of 8. Mbed TLS
90 * supports non-byte-aligned key sizes, but not well. For example,
91 * mbedtls_rsa_get_len() returns the key size in bytes, not in bits. */
92 bits = PSA_BYTES_TO_BITS(mbedtls_rsa_get_len(mbedtls_pk_rsa(ctx)));
93 if (bits > PSA_VENDOR_RSA_MAX_KEY_BITS) {
94 status = PSA_ERROR_NOT_SUPPORTED;
95 goto exit;
96 }
97 status = psa_check_rsa_key_byte_aligned(mbedtls_pk_rsa(ctx));
98 if (status != PSA_SUCCESS) {
99 goto exit;
100 }
101
102 /* Copy out the pointer to the RSA context, and reset the PK context
103 * such that pk_free doesn't free the RSA context we just grabbed. */
104 *p_rsa = mbedtls_pk_rsa(ctx);
105 ctx.pk_info = NULL;
106
107 exit:
108 mbedtls_pk_free(&ctx);
109 return status;
110 }
111 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
112 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) ||
113 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
114 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) ||
115 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) ||
116 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) ||
117 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
118
119 #if (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) && \
120 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) || \
121 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
mbedtls_psa_rsa_import_key(const psa_key_attributes_t * attributes,const uint8_t * data,size_t data_length,uint8_t * key_buffer,size_t key_buffer_size,size_t * key_buffer_length,size_t * bits)122 psa_status_t mbedtls_psa_rsa_import_key(
123 const psa_key_attributes_t *attributes,
124 const uint8_t *data, size_t data_length,
125 uint8_t *key_buffer, size_t key_buffer_size,
126 size_t *key_buffer_length, size_t *bits)
127 {
128 psa_status_t status;
129 mbedtls_rsa_context *rsa = NULL;
130
131 /* Parse input */
132 status = mbedtls_psa_rsa_load_representation(attributes->core.type,
133 data,
134 data_length,
135 &rsa);
136 if (status != PSA_SUCCESS) {
137 goto exit;
138 }
139
140 *bits = (psa_key_bits_t) PSA_BYTES_TO_BITS(mbedtls_rsa_get_len(rsa));
141
142 /* Re-export the data to PSA export format, such that we can store export
143 * representation in the key slot. Export representation in case of RSA is
144 * the smallest representation that's allowed as input, so a straight-up
145 * allocation of the same size as the input buffer will be large enough. */
146 status = mbedtls_psa_rsa_export_key(attributes->core.type,
147 rsa,
148 key_buffer,
149 key_buffer_size,
150 key_buffer_length);
151 exit:
152 /* Always free the RSA object */
153 mbedtls_rsa_free(rsa);
154 mbedtls_free(rsa);
155
156 return status;
157 }
158 #endif /* (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) &&
159 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) ||
160 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
161
162 #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || \
163 defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
mbedtls_psa_rsa_export_key(psa_key_type_t type,mbedtls_rsa_context * rsa,uint8_t * data,size_t data_size,size_t * data_length)164 psa_status_t mbedtls_psa_rsa_export_key(psa_key_type_t type,
165 mbedtls_rsa_context *rsa,
166 uint8_t *data,
167 size_t data_size,
168 size_t *data_length)
169 {
170 int ret;
171 mbedtls_pk_context pk;
172 uint8_t *pos = data + data_size;
173
174 mbedtls_pk_init(&pk);
175 pk.pk_info = &mbedtls_rsa_info;
176 pk.pk_ctx = rsa;
177
178 /* PSA Crypto API defines the format of an RSA key as a DER-encoded
179 * representation of the non-encrypted PKCS#1 RSAPrivateKey for a
180 * private key and of the RFC3279 RSAPublicKey for a public key. */
181 if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) {
182 ret = mbedtls_pk_write_key_der(&pk, data, data_size);
183 } else {
184 ret = mbedtls_pk_write_pubkey(&pos, data, &pk);
185 }
186
187 if (ret < 0) {
188 /* Clean up in case pk_write failed halfway through. */
189 memset(data, 0, data_size);
190 return mbedtls_to_psa_error(ret);
191 }
192
193 /* The mbedtls_pk_xxx functions write to the end of the buffer.
194 * Move the data to the beginning and erase remaining data
195 * at the original location. */
196 if (2 * (size_t) ret <= data_size) {
197 memcpy(data, data + data_size - ret, ret);
198 memset(data + data_size - ret, 0, ret);
199 } else if ((size_t) ret < data_size) {
200 memmove(data, data + data_size - ret, ret);
201 memset(data + ret, 0, data_size - ret);
202 }
203
204 *data_length = ret;
205 return PSA_SUCCESS;
206 }
207
mbedtls_psa_rsa_export_public_key(const psa_key_attributes_t * attributes,const uint8_t * key_buffer,size_t key_buffer_size,uint8_t * data,size_t data_size,size_t * data_length)208 psa_status_t mbedtls_psa_rsa_export_public_key(
209 const psa_key_attributes_t *attributes,
210 const uint8_t *key_buffer, size_t key_buffer_size,
211 uint8_t *data, size_t data_size, size_t *data_length)
212 {
213 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
214 mbedtls_rsa_context *rsa = NULL;
215
216 status = mbedtls_psa_rsa_load_representation(
217 attributes->core.type, key_buffer, key_buffer_size, &rsa);
218 if (status != PSA_SUCCESS) {
219 return status;
220 }
221
222 status = mbedtls_psa_rsa_export_key(PSA_KEY_TYPE_RSA_PUBLIC_KEY,
223 rsa,
224 data,
225 data_size,
226 data_length);
227
228 mbedtls_rsa_free(rsa);
229 mbedtls_free(rsa);
230
231 return status;
232 }
233 #endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) ||
234 * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
235
236 #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE)
psa_rsa_read_exponent(const uint8_t * domain_parameters,size_t domain_parameters_size,int * exponent)237 static psa_status_t psa_rsa_read_exponent(const uint8_t *domain_parameters,
238 size_t domain_parameters_size,
239 int *exponent)
240 {
241 size_t i;
242 uint32_t acc = 0;
243
244 if (domain_parameters_size == 0) {
245 *exponent = 65537;
246 return PSA_SUCCESS;
247 }
248
249 /* Mbed TLS encodes the public exponent as an int. For simplicity, only
250 * support values that fit in a 32-bit integer, which is larger than
251 * int on just about every platform anyway. */
252 if (domain_parameters_size > sizeof(acc)) {
253 return PSA_ERROR_NOT_SUPPORTED;
254 }
255 for (i = 0; i < domain_parameters_size; i++) {
256 acc = (acc << 8) | domain_parameters[i];
257 }
258 if (acc > INT_MAX) {
259 return PSA_ERROR_NOT_SUPPORTED;
260 }
261 *exponent = acc;
262 return PSA_SUCCESS;
263 }
264
mbedtls_psa_rsa_generate_key(const psa_key_attributes_t * attributes,uint8_t * key_buffer,size_t key_buffer_size,size_t * key_buffer_length)265 psa_status_t mbedtls_psa_rsa_generate_key(
266 const psa_key_attributes_t *attributes,
267 uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length)
268 {
269 psa_status_t status;
270 mbedtls_rsa_context rsa;
271 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
272 int exponent;
273
274 status = psa_rsa_read_exponent(attributes->domain_parameters,
275 attributes->domain_parameters_size,
276 &exponent);
277 if (status != PSA_SUCCESS) {
278 return status;
279 }
280
281 mbedtls_rsa_init(&rsa);
282 ret = mbedtls_rsa_gen_key(&rsa,
283 mbedtls_psa_get_random,
284 MBEDTLS_PSA_RANDOM_STATE,
285 (unsigned int) attributes->core.bits,
286 exponent);
287 if (ret != 0) {
288 return mbedtls_to_psa_error(ret);
289 }
290
291 status = mbedtls_psa_rsa_export_key(attributes->core.type,
292 &rsa, key_buffer, key_buffer_size,
293 key_buffer_length);
294 mbedtls_rsa_free(&rsa);
295
296 return status;
297 }
298 #endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE) */
299
300 /****************************************************************/
301 /* Sign/verify hashes */
302 /****************************************************************/
303
304 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
305 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
306
307 /* Decode the hash algorithm from alg and store the mbedtls encoding in
308 * md_alg. Verify that the hash length is acceptable. */
psa_rsa_decode_md_type(psa_algorithm_t alg,size_t hash_length,mbedtls_md_type_t * md_alg)309 static psa_status_t psa_rsa_decode_md_type(psa_algorithm_t alg,
310 size_t hash_length,
311 mbedtls_md_type_t *md_alg)
312 {
313 psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH(alg);
314 *md_alg = mbedtls_md_type_from_psa_alg(hash_alg);
315
316 /* The Mbed TLS RSA module uses an unsigned int for hash length
317 * parameters. Validate that it fits so that we don't risk an
318 * overflow later. */
319 #if SIZE_MAX > UINT_MAX
320 if (hash_length > UINT_MAX) {
321 return PSA_ERROR_INVALID_ARGUMENT;
322 }
323 #endif
324
325 /* For signatures using a hash, the hash length must be correct. */
326 if (alg != PSA_ALG_RSA_PKCS1V15_SIGN_RAW) {
327 if (*md_alg == MBEDTLS_MD_NONE) {
328 return PSA_ERROR_NOT_SUPPORTED;
329 }
330 if (mbedtls_md_get_size_from_type(*md_alg) != hash_length) {
331 return PSA_ERROR_INVALID_ARGUMENT;
332 }
333 }
334
335 return PSA_SUCCESS;
336 }
337
mbedtls_psa_rsa_sign_hash(const psa_key_attributes_t * attributes,const uint8_t * key_buffer,size_t key_buffer_size,psa_algorithm_t alg,const uint8_t * hash,size_t hash_length,uint8_t * signature,size_t signature_size,size_t * signature_length)338 psa_status_t mbedtls_psa_rsa_sign_hash(
339 const psa_key_attributes_t *attributes,
340 const uint8_t *key_buffer, size_t key_buffer_size,
341 psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
342 uint8_t *signature, size_t signature_size, size_t *signature_length)
343 {
344 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
345 mbedtls_rsa_context *rsa = NULL;
346 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
347 mbedtls_md_type_t md_alg;
348
349 status = mbedtls_psa_rsa_load_representation(attributes->core.type,
350 key_buffer,
351 key_buffer_size,
352 &rsa);
353 if (status != PSA_SUCCESS) {
354 return status;
355 }
356
357 status = psa_rsa_decode_md_type(alg, hash_length, &md_alg);
358 if (status != PSA_SUCCESS) {
359 goto exit;
360 }
361
362 if (signature_size < mbedtls_rsa_get_len(rsa)) {
363 status = PSA_ERROR_BUFFER_TOO_SMALL;
364 goto exit;
365 }
366
367 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN)
368 if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg)) {
369 ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V15,
370 MBEDTLS_MD_NONE);
371 if (ret == 0) {
372 ret = mbedtls_rsa_pkcs1_sign(rsa,
373 mbedtls_psa_get_random,
374 MBEDTLS_PSA_RANDOM_STATE,
375 md_alg,
376 (unsigned int) hash_length,
377 hash,
378 signature);
379 }
380 } else
381 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN */
382 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
383 if (PSA_ALG_IS_RSA_PSS(alg)) {
384 ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg);
385
386 if (ret == 0) {
387 ret = mbedtls_rsa_rsassa_pss_sign(rsa,
388 mbedtls_psa_get_random,
389 MBEDTLS_PSA_RANDOM_STATE,
390 MBEDTLS_MD_NONE,
391 (unsigned int) hash_length,
392 hash,
393 signature);
394 }
395 } else
396 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */
397 {
398 status = PSA_ERROR_INVALID_ARGUMENT;
399 goto exit;
400 }
401
402 if (ret == 0) {
403 *signature_length = mbedtls_rsa_get_len(rsa);
404 }
405 status = mbedtls_to_psa_error(ret);
406
407 exit:
408 mbedtls_rsa_free(rsa);
409 mbedtls_free(rsa);
410
411 return status;
412 }
413
414 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
rsa_pss_expected_salt_len(psa_algorithm_t alg,const mbedtls_rsa_context * rsa,size_t hash_length)415 static int rsa_pss_expected_salt_len(psa_algorithm_t alg,
416 const mbedtls_rsa_context *rsa,
417 size_t hash_length)
418 {
419 if (PSA_ALG_IS_RSA_PSS_ANY_SALT(alg)) {
420 return MBEDTLS_RSA_SALT_LEN_ANY;
421 }
422 /* Otherwise: standard salt length, i.e. largest possible salt length
423 * up to the hash length. */
424 int klen = (int) mbedtls_rsa_get_len(rsa); // known to fit
425 int hlen = (int) hash_length; // known to fit
426 int room = klen - 2 - hlen;
427 if (room < 0) {
428 return 0; // there is no valid signature in this case anyway
429 } else if (room > hlen) {
430 return hlen;
431 } else {
432 return room;
433 }
434 }
435 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */
436
mbedtls_psa_rsa_verify_hash(const psa_key_attributes_t * attributes,const uint8_t * key_buffer,size_t key_buffer_size,psa_algorithm_t alg,const uint8_t * hash,size_t hash_length,const uint8_t * signature,size_t signature_length)437 psa_status_t mbedtls_psa_rsa_verify_hash(
438 const psa_key_attributes_t *attributes,
439 const uint8_t *key_buffer, size_t key_buffer_size,
440 psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
441 const uint8_t *signature, size_t signature_length)
442 {
443 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
444 mbedtls_rsa_context *rsa = NULL;
445 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
446 mbedtls_md_type_t md_alg;
447
448 status = mbedtls_psa_rsa_load_representation(attributes->core.type,
449 key_buffer,
450 key_buffer_size,
451 &rsa);
452 if (status != PSA_SUCCESS) {
453 goto exit;
454 }
455
456 status = psa_rsa_decode_md_type(alg, hash_length, &md_alg);
457 if (status != PSA_SUCCESS) {
458 goto exit;
459 }
460
461 if (signature_length != mbedtls_rsa_get_len(rsa)) {
462 status = PSA_ERROR_INVALID_SIGNATURE;
463 goto exit;
464 }
465
466 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN)
467 if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg)) {
468 ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V15,
469 MBEDTLS_MD_NONE);
470 if (ret == 0) {
471 ret = mbedtls_rsa_pkcs1_verify(rsa,
472 md_alg,
473 (unsigned int) hash_length,
474 hash,
475 signature);
476 }
477 } else
478 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN */
479 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
480 if (PSA_ALG_IS_RSA_PSS(alg)) {
481 ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg);
482 if (ret == 0) {
483 int slen = rsa_pss_expected_salt_len(alg, rsa, hash_length);
484 ret = mbedtls_rsa_rsassa_pss_verify_ext(rsa,
485 md_alg,
486 (unsigned) hash_length,
487 hash,
488 md_alg,
489 slen,
490 signature);
491 }
492 } else
493 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */
494 {
495 status = PSA_ERROR_INVALID_ARGUMENT;
496 goto exit;
497 }
498
499 /* Mbed TLS distinguishes "invalid padding" from "valid padding but
500 * the rest of the signature is invalid". This has little use in
501 * practice and PSA doesn't report this distinction. */
502 status = (ret == MBEDTLS_ERR_RSA_INVALID_PADDING) ?
503 PSA_ERROR_INVALID_SIGNATURE :
504 mbedtls_to_psa_error(ret);
505
506 exit:
507 mbedtls_rsa_free(rsa);
508 mbedtls_free(rsa);
509
510 return status;
511 }
512
513 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
514 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) */
515
516 /****************************************************************/
517 /* Asymmetric cryptography */
518 /****************************************************************/
519
520 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
psa_rsa_oaep_set_padding_mode(psa_algorithm_t alg,mbedtls_rsa_context * rsa)521 static int psa_rsa_oaep_set_padding_mode(psa_algorithm_t alg,
522 mbedtls_rsa_context *rsa)
523 {
524 psa_algorithm_t hash_alg = PSA_ALG_RSA_OAEP_GET_HASH(alg);
525 mbedtls_md_type_t md_alg = mbedtls_md_type_from_psa_alg(hash_alg);
526
527 /* Just to get the error status right, as rsa_set_padding() doesn't
528 * distinguish between "bad RSA algorithm" and "unknown hash". */
529 if (mbedtls_md_info_from_type(md_alg) == NULL) {
530 return PSA_ERROR_NOT_SUPPORTED;
531 }
532
533 return mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg);
534 }
535 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
536
mbedtls_psa_asymmetric_encrypt(const psa_key_attributes_t * attributes,const uint8_t * key_buffer,size_t key_buffer_size,psa_algorithm_t alg,const uint8_t * input,size_t input_length,const uint8_t * salt,size_t salt_length,uint8_t * output,size_t output_size,size_t * output_length)537 psa_status_t mbedtls_psa_asymmetric_encrypt(const psa_key_attributes_t *attributes,
538 const uint8_t *key_buffer,
539 size_t key_buffer_size,
540 psa_algorithm_t alg,
541 const uint8_t *input,
542 size_t input_length,
543 const uint8_t *salt,
544 size_t salt_length,
545 uint8_t *output,
546 size_t output_size,
547 size_t *output_length)
548 {
549 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
550 (void) key_buffer;
551 (void) key_buffer_size;
552 (void) input;
553 (void) input_length;
554 (void) salt;
555 (void) salt_length;
556 (void) output;
557 (void) output_size;
558 (void) output_length;
559
560 if (PSA_KEY_TYPE_IS_RSA(attributes->core.type)) {
561 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
562 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
563 mbedtls_rsa_context *rsa = NULL;
564 status = mbedtls_psa_rsa_load_representation(attributes->core.type,
565 key_buffer,
566 key_buffer_size,
567 &rsa);
568 if (status != PSA_SUCCESS) {
569 goto rsa_exit;
570 }
571
572 if (output_size < mbedtls_rsa_get_len(rsa)) {
573 status = PSA_ERROR_BUFFER_TOO_SMALL;
574 goto rsa_exit;
575 }
576 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
577 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
578 if (alg == PSA_ALG_RSA_PKCS1V15_CRYPT) {
579 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT)
580 status = mbedtls_to_psa_error(
581 mbedtls_rsa_pkcs1_encrypt(rsa,
582 mbedtls_psa_get_random,
583 MBEDTLS_PSA_RANDOM_STATE,
584 input_length,
585 input,
586 output));
587 #else
588 status = PSA_ERROR_NOT_SUPPORTED;
589 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */
590 } else
591 if (PSA_ALG_IS_RSA_OAEP(alg)) {
592 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
593 status = mbedtls_to_psa_error(
594 psa_rsa_oaep_set_padding_mode(alg, rsa));
595 if (status != PSA_SUCCESS) {
596 goto rsa_exit;
597 }
598
599 status = mbedtls_to_psa_error(
600 mbedtls_rsa_rsaes_oaep_encrypt(rsa,
601 mbedtls_psa_get_random,
602 MBEDTLS_PSA_RANDOM_STATE,
603 salt, salt_length,
604 input_length,
605 input,
606 output));
607 #else
608 status = PSA_ERROR_NOT_SUPPORTED;
609 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */
610 } else {
611 status = PSA_ERROR_INVALID_ARGUMENT;
612 }
613 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
614 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
615 rsa_exit:
616 if (status == PSA_SUCCESS) {
617 *output_length = mbedtls_rsa_get_len(rsa);
618 }
619
620 mbedtls_rsa_free(rsa);
621 mbedtls_free(rsa);
622 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
623 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
624 } else {
625 status = PSA_ERROR_NOT_SUPPORTED;
626 }
627
628 return status;
629 }
630
mbedtls_psa_asymmetric_decrypt(const psa_key_attributes_t * attributes,const uint8_t * key_buffer,size_t key_buffer_size,psa_algorithm_t alg,const uint8_t * input,size_t input_length,const uint8_t * salt,size_t salt_length,uint8_t * output,size_t output_size,size_t * output_length)631 psa_status_t mbedtls_psa_asymmetric_decrypt(const psa_key_attributes_t *attributes,
632 const uint8_t *key_buffer,
633 size_t key_buffer_size,
634 psa_algorithm_t alg,
635 const uint8_t *input,
636 size_t input_length,
637 const uint8_t *salt,
638 size_t salt_length,
639 uint8_t *output,
640 size_t output_size,
641 size_t *output_length)
642 {
643 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
644 (void) key_buffer;
645 (void) key_buffer_size;
646 (void) input;
647 (void) input_length;
648 (void) salt;
649 (void) salt_length;
650 (void) output;
651 (void) output_size;
652 (void) output_length;
653
654 *output_length = 0;
655
656 if (attributes->core.type == PSA_KEY_TYPE_RSA_KEY_PAIR) {
657 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
658 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
659 mbedtls_rsa_context *rsa = NULL;
660 status = mbedtls_psa_rsa_load_representation(attributes->core.type,
661 key_buffer,
662 key_buffer_size,
663 &rsa);
664 if (status != PSA_SUCCESS) {
665 goto rsa_exit;
666 }
667
668 if (input_length != mbedtls_rsa_get_len(rsa)) {
669 status = PSA_ERROR_INVALID_ARGUMENT;
670 goto rsa_exit;
671 }
672 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
673 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
674
675 if (alg == PSA_ALG_RSA_PKCS1V15_CRYPT) {
676 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT)
677 status = mbedtls_to_psa_error(
678 mbedtls_rsa_pkcs1_decrypt(rsa,
679 mbedtls_psa_get_random,
680 MBEDTLS_PSA_RANDOM_STATE,
681 output_length,
682 input,
683 output,
684 output_size));
685 #else
686 status = PSA_ERROR_NOT_SUPPORTED;
687 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */
688 } else
689 if (PSA_ALG_IS_RSA_OAEP(alg)) {
690 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
691 status = mbedtls_to_psa_error(
692 psa_rsa_oaep_set_padding_mode(alg, rsa));
693 if (status != PSA_SUCCESS) {
694 goto rsa_exit;
695 }
696
697 status = mbedtls_to_psa_error(
698 mbedtls_rsa_rsaes_oaep_decrypt(rsa,
699 mbedtls_psa_get_random,
700 MBEDTLS_PSA_RANDOM_STATE,
701 salt, salt_length,
702 output_length,
703 input,
704 output,
705 output_size));
706 #else
707 status = PSA_ERROR_NOT_SUPPORTED;
708 #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */
709 } else {
710 status = PSA_ERROR_INVALID_ARGUMENT;
711 }
712
713 #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \
714 defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP)
715 rsa_exit:
716 mbedtls_rsa_free(rsa);
717 mbedtls_free(rsa);
718 #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) ||
719 * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */
720 } else {
721 status = PSA_ERROR_NOT_SUPPORTED;
722 }
723
724 return status;
725 }
726
727 #endif /* MBEDTLS_PSA_CRYPTO_C */
728
