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1 | /* |
2 | * QEMU Crypto akcipher algorithms | |
3 | * | |
4 | * Copyright (c) 2022 Bytedance | |
5 | * Author: lei he <helei.sig11@bytedance.com> | |
6 | * | |
7 | * This library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <gcrypt.h> | |
23 | ||
24 | #include "qemu/osdep.h" | |
25 | #include "qemu/host-utils.h" | |
26 | #include "crypto/akcipher.h" | |
27 | #include "crypto/random.h" | |
28 | #include "qapi/error.h" | |
29 | #include "sysemu/cryptodev.h" | |
30 | #include "rsakey.h" | |
31 | ||
32 | typedef struct QCryptoGcryptRSA { | |
33 | QCryptoAkCipher akcipher; | |
34 | gcry_sexp_t key; | |
35 | QCryptoRSAPaddingAlgorithm padding_alg; | |
36 | QCryptoHashAlgorithm hash_alg; | |
37 | } QCryptoGcryptRSA; | |
38 | ||
39 | static void qcrypto_gcrypt_rsa_free(QCryptoAkCipher *akcipher) | |
40 | { | |
41 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; | |
42 | if (!rsa) { | |
43 | return; | |
44 | } | |
45 | ||
46 | gcry_sexp_release(rsa->key); | |
47 | g_free(rsa); | |
48 | } | |
49 | ||
50 | static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new( | |
51 | const QCryptoAkCipherOptionsRSA *opt, | |
52 | QCryptoAkCipherKeyType type, | |
53 | const uint8_t *key, size_t keylen, | |
54 | Error **errp); | |
55 | ||
56 | QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts, | |
57 | QCryptoAkCipherKeyType type, | |
58 | const uint8_t *key, size_t keylen, | |
59 | Error **errp) | |
60 | { | |
61 | switch (opts->alg) { | |
62 | case QCRYPTO_AKCIPHER_ALG_RSA: | |
63 | return (QCryptoAkCipher *)qcrypto_gcrypt_rsa_new( | |
64 | &opts->u.rsa, type, key, keylen, errp); | |
65 | ||
66 | default: | |
67 | error_setg(errp, "Unsupported algorithm: %u", opts->alg); | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | return NULL; | |
72 | } | |
73 | ||
74 | static void qcrypto_gcrypt_set_rsa_size(QCryptoAkCipher *akcipher, gcry_mpi_t n) | |
75 | { | |
76 | size_t key_size = (gcry_mpi_get_nbits(n) + 7) / 8; | |
77 | akcipher->max_plaintext_len = key_size; | |
78 | akcipher->max_ciphertext_len = key_size; | |
79 | akcipher->max_dgst_len = key_size; | |
80 | akcipher->max_signature_len = key_size; | |
81 | } | |
82 | ||
83 | static int qcrypto_gcrypt_parse_rsa_private_key( | |
84 | QCryptoGcryptRSA *rsa, | |
85 | const uint8_t *key, size_t keylen, Error **errp) | |
86 | { | |
87 | g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse( | |
88 | QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE, key, keylen, errp); | |
89 | gcry_mpi_t n = NULL, e = NULL, d = NULL, p = NULL, q = NULL, u = NULL; | |
90 | bool compute_mul_inv = false; | |
91 | int ret = -1; | |
92 | gcry_error_t err; | |
93 | ||
94 | if (!rsa_key) { | |
95 | return ret; | |
96 | } | |
97 | ||
98 | err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, | |
99 | rsa_key->n.data, rsa_key->n.len, NULL); | |
100 | if (gcry_err_code(err) != 0) { | |
101 | error_setg(errp, "Failed to parse RSA parameter n: %s/%s", | |
102 | gcry_strsource(err), gcry_strerror(err)); | |
103 | goto cleanup; | |
104 | } | |
105 | ||
106 | err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, | |
107 | rsa_key->e.data, rsa_key->e.len, NULL); | |
108 | if (gcry_err_code(err) != 0) { | |
109 | error_setg(errp, "Failed to parse RSA parameter e: %s/%s", | |
110 | gcry_strsource(err), gcry_strerror(err)); | |
111 | goto cleanup; | |
112 | } | |
113 | ||
114 | err = gcry_mpi_scan(&d, GCRYMPI_FMT_STD, | |
115 | rsa_key->d.data, rsa_key->d.len, NULL); | |
116 | if (gcry_err_code(err) != 0) { | |
117 | error_setg(errp, "Failed to parse RSA parameter d: %s/%s", | |
118 | gcry_strsource(err), gcry_strerror(err)); | |
119 | goto cleanup; | |
120 | } | |
121 | ||
122 | err = gcry_mpi_scan(&p, GCRYMPI_FMT_STD, | |
123 | rsa_key->p.data, rsa_key->p.len, NULL); | |
124 | if (gcry_err_code(err) != 0) { | |
125 | error_setg(errp, "Failed to parse RSA parameter p: %s/%s", | |
126 | gcry_strsource(err), gcry_strerror(err)); | |
127 | goto cleanup; | |
128 | } | |
129 | ||
130 | err = gcry_mpi_scan(&q, GCRYMPI_FMT_STD, | |
131 | rsa_key->q.data, rsa_key->q.len, NULL); | |
132 | if (gcry_err_code(err) != 0) { | |
133 | error_setg(errp, "Failed to parse RSA parameter q: %s/%s", | |
134 | gcry_strsource(err), gcry_strerror(err)); | |
135 | goto cleanup; | |
136 | } | |
137 | ||
138 | if (gcry_mpi_cmp_ui(p, 0) > 0 && gcry_mpi_cmp_ui(q, 0) > 0) { | |
139 | compute_mul_inv = true; | |
140 | ||
141 | u = gcry_mpi_new(0); | |
142 | if (gcry_mpi_cmp(p, q) > 0) { | |
143 | gcry_mpi_swap(p, q); | |
144 | } | |
145 | gcry_mpi_invm(u, p, q); | |
146 | } | |
147 | ||
148 | if (compute_mul_inv) { | |
149 | err = gcry_sexp_build(&rsa->key, NULL, | |
150 | "(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))", | |
151 | n, e, d, p, q, u); | |
152 | } else { | |
153 | err = gcry_sexp_build(&rsa->key, NULL, | |
154 | "(private-key (rsa (n %m) (e %m) (d %m)))", n, e, d); | |
155 | } | |
156 | if (gcry_err_code(err) != 0) { | |
157 | error_setg(errp, "Failed to build RSA private key: %s/%s", | |
158 | gcry_strsource(err), gcry_strerror(err)); | |
159 | goto cleanup; | |
160 | } | |
161 | qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); | |
162 | ret = 0; | |
163 | ||
164 | cleanup: | |
165 | gcry_mpi_release(n); | |
166 | gcry_mpi_release(e); | |
167 | gcry_mpi_release(d); | |
168 | gcry_mpi_release(p); | |
169 | gcry_mpi_release(q); | |
170 | gcry_mpi_release(u); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | static int qcrypto_gcrypt_parse_rsa_public_key(QCryptoGcryptRSA *rsa, | |
175 | const uint8_t *key, | |
176 | size_t keylen, | |
177 | Error **errp) | |
178 | { | |
179 | ||
180 | g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse( | |
181 | QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC, key, keylen, errp); | |
182 | gcry_mpi_t n = NULL, e = NULL; | |
183 | int ret = -1; | |
184 | gcry_error_t err; | |
185 | ||
186 | if (!rsa_key) { | |
187 | return ret; | |
188 | } | |
189 | ||
190 | err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, | |
191 | rsa_key->n.data, rsa_key->n.len, NULL); | |
192 | if (gcry_err_code(err) != 0) { | |
193 | error_setg(errp, "Failed to parse RSA parameter n: %s/%s", | |
194 | gcry_strsource(err), gcry_strerror(err)); | |
195 | goto cleanup; | |
196 | } | |
197 | ||
198 | err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, | |
199 | rsa_key->e.data, rsa_key->e.len, NULL); | |
200 | if (gcry_err_code(err) != 0) { | |
201 | error_setg(errp, "Failed to parse RSA parameter e: %s/%s", | |
202 | gcry_strsource(err), gcry_strerror(err)); | |
203 | goto cleanup; | |
204 | } | |
205 | ||
206 | err = gcry_sexp_build(&rsa->key, NULL, | |
207 | "(public-key (rsa (n %m) (e %m)))", n, e); | |
208 | if (gcry_err_code(err) != 0) { | |
209 | error_setg(errp, "Failed to build RSA public key: %s/%s", | |
210 | gcry_strsource(err), gcry_strerror(err)); | |
211 | goto cleanup; | |
212 | } | |
213 | qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); | |
214 | ret = 0; | |
215 | ||
216 | cleanup: | |
217 | gcry_mpi_release(n); | |
218 | gcry_mpi_release(e); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | static int qcrypto_gcrypt_rsa_encrypt(QCryptoAkCipher *akcipher, | |
223 | const void *in, size_t in_len, | |
224 | void *out, size_t out_len, | |
225 | Error **errp) | |
226 | { | |
227 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; | |
228 | int ret = -1; | |
229 | gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; | |
230 | gcry_sexp_t cipher_sexp_item = NULL; | |
231 | gcry_mpi_t cipher_mpi = NULL; | |
232 | const char *result; | |
233 | gcry_error_t err; | |
234 | size_t actual_len; | |
235 | ||
236 | if (in_len > akcipher->max_plaintext_len) { | |
237 | error_setg(errp, "Plaintext length is greater than key size: %d", | |
238 | akcipher->max_plaintext_len); | |
239 | return ret; | |
240 | } | |
241 | ||
242 | err = gcry_sexp_build(&data_sexp, NULL, | |
243 | "(data (flags %s) (value %b))", | |
244 | QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg), | |
245 | in_len, in); | |
246 | if (gcry_err_code(err) != 0) { | |
247 | error_setg(errp, "Failed to build plaintext: %s/%s", | |
248 | gcry_strsource(err), gcry_strerror(err)); | |
249 | goto cleanup; | |
250 | } | |
251 | ||
252 | err = gcry_pk_encrypt(&cipher_sexp, data_sexp, rsa->key); | |
253 | if (gcry_err_code(err) != 0) { | |
254 | error_setg(errp, "Failed to encrypt: %s/%s", | |
255 | gcry_strsource(err), gcry_strerror(err)); | |
256 | goto cleanup; | |
257 | } | |
258 | ||
259 | /* S-expression of cipher: (enc-val (rsa (a a-mpi))) */ | |
260 | cipher_sexp_item = gcry_sexp_find_token(cipher_sexp, "a", 0); | |
261 | if (!cipher_sexp_item || gcry_sexp_length(cipher_sexp_item) != 2) { | |
262 | error_setg(errp, "Invalid ciphertext result"); | |
263 | goto cleanup; | |
264 | } | |
265 | ||
266 | if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { | |
267 | cipher_mpi = gcry_sexp_nth_mpi(cipher_sexp_item, 1, GCRYMPI_FMT_USG); | |
268 | if (!cipher_mpi) { | |
269 | error_setg(errp, "Invalid ciphertext result"); | |
270 | goto cleanup; | |
271 | } | |
272 | err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, | |
273 | &actual_len, cipher_mpi); | |
274 | if (gcry_err_code(err) != 0) { | |
275 | error_setg(errp, "Failed to print MPI: %s/%s", | |
276 | gcry_strsource(err), gcry_strerror(err)); | |
277 | goto cleanup; | |
278 | } | |
279 | ||
280 | if (actual_len > out_len) { | |
281 | error_setg(errp, "Ciphertext buffer length is too small"); | |
282 | goto cleanup; | |
283 | } | |
284 | ||
285 | /* We always padding leading-zeros for RSA-RAW */ | |
286 | if (actual_len < out_len) { | |
287 | memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); | |
288 | memset(out, 0, out_len - actual_len); | |
289 | } | |
290 | ret = out_len; | |
291 | ||
292 | } else { | |
293 | result = gcry_sexp_nth_data(cipher_sexp_item, 1, &actual_len); | |
294 | if (!result) { | |
295 | error_setg(errp, "Invalid ciphertext result"); | |
296 | goto cleanup; | |
297 | } | |
298 | if (actual_len > out_len) { | |
299 | error_setg(errp, "Ciphertext buffer length is too small"); | |
300 | goto cleanup; | |
301 | } | |
302 | memcpy(out, result, actual_len); | |
303 | ret = actual_len; | |
304 | } | |
305 | ||
306 | cleanup: | |
307 | gcry_sexp_release(data_sexp); | |
308 | gcry_sexp_release(cipher_sexp); | |
309 | gcry_sexp_release(cipher_sexp_item); | |
310 | gcry_mpi_release(cipher_mpi); | |
311 | return ret; | |
312 | } | |
313 | ||
314 | static int qcrypto_gcrypt_rsa_decrypt(QCryptoAkCipher *akcipher, | |
315 | const void *in, size_t in_len, | |
316 | void *out, size_t out_len, | |
317 | Error **errp) | |
318 | { | |
319 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; | |
320 | int ret = -1; | |
321 | gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; | |
322 | gcry_mpi_t data_mpi = NULL; | |
323 | gcry_error_t err; | |
324 | size_t actual_len; | |
325 | const char *result; | |
326 | ||
327 | if (in_len > akcipher->max_ciphertext_len) { | |
328 | error_setg(errp, "Ciphertext length is greater than key size: %d", | |
329 | akcipher->max_ciphertext_len); | |
330 | return ret; | |
331 | } | |
332 | ||
333 | err = gcry_sexp_build(&cipher_sexp, NULL, | |
334 | "(enc-val (flags %s) (rsa (a %b) ))", | |
335 | QCryptoRSAPaddingAlgorithm_str(rsa->padding_alg), | |
336 | in_len, in); | |
337 | if (gcry_err_code(err) != 0) { | |
338 | error_setg(errp, "Failed to build ciphertext: %s/%s", | |
339 | gcry_strsource(err), gcry_strerror(err)); | |
340 | goto cleanup; | |
341 | } | |
342 | ||
343 | err = gcry_pk_decrypt(&data_sexp, cipher_sexp, rsa->key); | |
344 | if (gcry_err_code(err) != 0) { | |
345 | error_setg(errp, "Failed to decrypt: %s/%s", | |
346 | gcry_strsource(err), gcry_strerror(err)); | |
347 | goto cleanup; | |
348 | } | |
349 | ||
350 | /* S-expression of plaintext: (value plaintext) */ | |
351 | if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { | |
352 | data_mpi = gcry_sexp_nth_mpi(data_sexp, 1, GCRYMPI_FMT_USG); | |
353 | if (!data_mpi) { | |
354 | error_setg(errp, "Invalid plaintext result"); | |
355 | goto cleanup; | |
356 | } | |
357 | err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, | |
358 | &actual_len, data_mpi); | |
359 | if (gcry_err_code(err) != 0) { | |
360 | error_setg(errp, "Failed to print MPI: %s/%s", | |
361 | gcry_strsource(err), gcry_strerror(err)); | |
362 | goto cleanup; | |
363 | } | |
364 | if (actual_len > out_len) { | |
365 | error_setg(errp, "Plaintext buffer length is too small"); | |
366 | goto cleanup; | |
367 | } | |
368 | /* We always padding leading-zeros for RSA-RAW */ | |
369 | if (actual_len < out_len) { | |
370 | memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); | |
371 | memset(out, 0, out_len - actual_len); | |
372 | } | |
373 | ret = out_len; | |
374 | } else { | |
375 | result = gcry_sexp_nth_data(data_sexp, 1, &actual_len); | |
376 | if (!result) { | |
377 | error_setg(errp, "Invalid plaintext result"); | |
378 | goto cleanup; | |
379 | } | |
380 | if (actual_len > out_len) { | |
381 | error_setg(errp, "Plaintext buffer length is too small"); | |
382 | goto cleanup; | |
383 | } | |
384 | memcpy(out, result, actual_len); | |
385 | ret = actual_len; | |
386 | } | |
387 | ||
388 | cleanup: | |
389 | gcry_sexp_release(cipher_sexp); | |
390 | gcry_sexp_release(data_sexp); | |
391 | gcry_mpi_release(data_mpi); | |
392 | return ret; | |
393 | } | |
394 | ||
395 | static int qcrypto_gcrypt_rsa_sign(QCryptoAkCipher *akcipher, | |
396 | const void *in, size_t in_len, | |
397 | void *out, size_t out_len, Error **errp) | |
398 | { | |
399 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; | |
400 | int ret = -1; | |
401 | gcry_sexp_t dgst_sexp = NULL, sig_sexp = NULL; | |
402 | gcry_sexp_t sig_sexp_item = NULL; | |
403 | const char *result; | |
404 | gcry_error_t err; | |
405 | size_t actual_len; | |
406 | ||
407 | if (in_len > akcipher->max_dgst_len) { | |
408 | error_setg(errp, "Data length is greater than key size: %d", | |
409 | akcipher->max_dgst_len); | |
410 | return ret; | |
411 | } | |
412 | ||
413 | if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALG_PKCS1) { | |
414 | error_setg(errp, "Invalid padding %u", rsa->padding_alg); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | err = gcry_sexp_build(&dgst_sexp, NULL, | |
419 | "(data (flags pkcs1) (hash %s %b))", | |
420 | QCryptoHashAlgorithm_str(rsa->hash_alg), | |
421 | in_len, in); | |
422 | if (gcry_err_code(err) != 0) { | |
423 | error_setg(errp, "Failed to build dgst: %s/%s", | |
424 | gcry_strsource(err), gcry_strerror(err)); | |
425 | goto cleanup; | |
426 | } | |
427 | ||
428 | err = gcry_pk_sign(&sig_sexp, dgst_sexp, rsa->key); | |
429 | if (gcry_err_code(err) != 0) { | |
430 | error_setg(errp, "Failed to make signature: %s/%s", | |
431 | gcry_strsource(err), gcry_strerror(err)); | |
432 | goto cleanup; | |
433 | } | |
434 | ||
435 | /* S-expression of signature: (sig-val (rsa (s s-mpi))) */ | |
436 | sig_sexp_item = gcry_sexp_find_token(sig_sexp, "s", 0); | |
437 | if (!sig_sexp_item || gcry_sexp_length(sig_sexp_item) != 2) { | |
438 | error_setg(errp, "Invalid signature result"); | |
439 | goto cleanup; | |
440 | } | |
441 | ||
442 | result = gcry_sexp_nth_data(sig_sexp_item, 1, &actual_len); | |
443 | if (!result) { | |
444 | error_setg(errp, "Invalid signature result"); | |
445 | goto cleanup; | |
446 | } | |
447 | ||
448 | if (actual_len > out_len) { | |
449 | error_setg(errp, "Signature buffer length is too small"); | |
450 | goto cleanup; | |
451 | } | |
452 | memcpy(out, result, actual_len); | |
453 | ret = actual_len; | |
454 | ||
455 | cleanup: | |
456 | gcry_sexp_release(dgst_sexp); | |
457 | gcry_sexp_release(sig_sexp); | |
458 | gcry_sexp_release(sig_sexp_item); | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
463 | static int qcrypto_gcrypt_rsa_verify(QCryptoAkCipher *akcipher, | |
464 | const void *in, size_t in_len, | |
465 | const void *in2, size_t in2_len, | |
466 | Error **errp) | |
467 | { | |
468 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; | |
469 | int ret = -1; | |
470 | gcry_sexp_t sig_sexp = NULL, dgst_sexp = NULL; | |
471 | gcry_error_t err; | |
472 | ||
473 | if (in_len > akcipher->max_signature_len) { | |
474 | error_setg(errp, "Signature length is greater than key size: %d", | |
475 | akcipher->max_signature_len); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | if (in2_len > akcipher->max_dgst_len) { | |
480 | error_setg(errp, "Data length is greater than key size: %d", | |
481 | akcipher->max_dgst_len); | |
482 | return ret; | |
483 | } | |
484 | ||
485 | if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALG_PKCS1) { | |
486 | error_setg(errp, "Invalid padding %u", rsa->padding_alg); | |
487 | return ret; | |
488 | } | |
489 | ||
490 | err = gcry_sexp_build(&sig_sexp, NULL, | |
491 | "(sig-val (rsa (s %b)))", in_len, in); | |
492 | if (gcry_err_code(err) != 0) { | |
493 | error_setg(errp, "Failed to build signature: %s/%s", | |
494 | gcry_strsource(err), gcry_strerror(err)); | |
495 | goto cleanup; | |
496 | } | |
497 | ||
498 | err = gcry_sexp_build(&dgst_sexp, NULL, | |
499 | "(data (flags pkcs1) (hash %s %b))", | |
500 | QCryptoHashAlgorithm_str(rsa->hash_alg), | |
501 | in2_len, in2); | |
502 | if (gcry_err_code(err) != 0) { | |
503 | error_setg(errp, "Failed to build dgst: %s/%s", | |
504 | gcry_strsource(err), gcry_strerror(err)); | |
505 | goto cleanup; | |
506 | } | |
507 | ||
508 | err = gcry_pk_verify(sig_sexp, dgst_sexp, rsa->key); | |
509 | if (gcry_err_code(err) != 0) { | |
510 | error_setg(errp, "Failed to verify signature: %s/%s", | |
511 | gcry_strsource(err), gcry_strerror(err)); | |
512 | goto cleanup; | |
513 | } | |
514 | ret = 0; | |
515 | ||
516 | cleanup: | |
517 | gcry_sexp_release(dgst_sexp); | |
518 | gcry_sexp_release(sig_sexp); | |
519 | ||
520 | return ret; | |
521 | } | |
522 | ||
523 | QCryptoAkCipherDriver gcrypt_rsa = { | |
524 | .encrypt = qcrypto_gcrypt_rsa_encrypt, | |
525 | .decrypt = qcrypto_gcrypt_rsa_decrypt, | |
526 | .sign = qcrypto_gcrypt_rsa_sign, | |
527 | .verify = qcrypto_gcrypt_rsa_verify, | |
528 | .free = qcrypto_gcrypt_rsa_free, | |
529 | }; | |
530 | ||
531 | static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new( | |
532 | const QCryptoAkCipherOptionsRSA *opt, | |
533 | QCryptoAkCipherKeyType type, | |
534 | const uint8_t *key, size_t keylen, | |
535 | Error **errp) | |
536 | { | |
537 | QCryptoGcryptRSA *rsa = g_new0(QCryptoGcryptRSA, 1); | |
538 | rsa->padding_alg = opt->padding_alg; | |
539 | rsa->hash_alg = opt->hash_alg; | |
540 | rsa->akcipher.driver = &gcrypt_rsa; | |
541 | ||
542 | switch (type) { | |
543 | case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE: | |
544 | if (qcrypto_gcrypt_parse_rsa_private_key(rsa, key, keylen, errp) != 0) { | |
545 | goto error; | |
546 | } | |
547 | break; | |
548 | ||
549 | case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC: | |
550 | if (qcrypto_gcrypt_parse_rsa_public_key(rsa, key, keylen, errp) != 0) { | |
551 | goto error; | |
552 | } | |
553 | break; | |
554 | ||
555 | default: | |
556 | error_setg(errp, "Unknown akcipher key type %d", type); | |
557 | goto error; | |
558 | } | |
559 | ||
560 | return rsa; | |
561 | ||
562 | error: | |
563 | qcrypto_gcrypt_rsa_free((QCryptoAkCipher *)rsa); | |
564 | return NULL; | |
565 | } | |
566 | ||
567 | ||
568 | bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts) | |
569 | { | |
570 | switch (opts->alg) { | |
571 | case QCRYPTO_AKCIPHER_ALG_RSA: | |
572 | switch (opts->u.rsa.padding_alg) { | |
573 | case QCRYPTO_RSA_PADDING_ALG_RAW: | |
574 | return true; | |
575 | ||
576 | case QCRYPTO_RSA_PADDING_ALG_PKCS1: | |
577 | switch (opts->u.rsa.hash_alg) { | |
578 | case QCRYPTO_HASH_ALG_MD5: | |
579 | case QCRYPTO_HASH_ALG_SHA1: | |
580 | case QCRYPTO_HASH_ALG_SHA256: | |
581 | case QCRYPTO_HASH_ALG_SHA512: | |
582 | return true; | |
583 | ||
584 | default: | |
585 | return false; | |
586 | } | |
587 | ||
588 | default: | |
589 | return false; | |
590 | } | |
591 | ||
592 | default: | |
593 | return true; | |
594 | } | |
595 | } |