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ed754746 DB |
1 | /* |
2 | * QEMU Crypto cipher nettle algorithms | |
3 | * | |
4 | * Copyright (c) 2015 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
42f7a448 | 21 | #include "qemu/osdep.h" |
eaec903c DB |
22 | #include "crypto/xts.h" |
23 | ||
ed754746 DB |
24 | #include <nettle/nettle-types.h> |
25 | #include <nettle/aes.h> | |
26 | #include <nettle/des.h> | |
27 | #include <nettle/cbc.h> | |
084a85ee | 28 | #include <nettle/cast128.h> |
94318522 | 29 | #include <nettle/serpent.h> |
50f6753e | 30 | #include <nettle/twofish.h> |
3c28292f | 31 | #include <nettle/ctr.h> |
ed754746 | 32 | |
f7ac78cf DB |
33 | typedef void (*QCryptoCipherNettleFuncWrapper)(const void *ctx, |
34 | size_t length, | |
35 | uint8_t *dst, | |
36 | const uint8_t *src); | |
d3462e37 | 37 | |
f7ac78cf DB |
38 | #if CONFIG_NETTLE_VERSION_MAJOR < 3 |
39 | typedef nettle_crypt_func * QCryptoCipherNettleFuncNative; | |
d3462e37 RK |
40 | typedef void * cipher_ctx_t; |
41 | typedef unsigned cipher_length_t; | |
621e6ae6 DB |
42 | |
43 | #define cast5_set_key cast128_set_key | |
d3462e37 | 44 | #else |
f7ac78cf | 45 | typedef nettle_cipher_func * QCryptoCipherNettleFuncNative; |
d3462e37 RK |
46 | typedef const void * cipher_ctx_t; |
47 | typedef size_t cipher_length_t; | |
becaeb72 RK |
48 | #endif |
49 | ||
e3ba0b67 DB |
50 | typedef struct QCryptoNettleAES { |
51 | struct aes_ctx enc; | |
52 | struct aes_ctx dec; | |
53 | } QCryptoNettleAES; | |
54 | ||
f7ac78cf DB |
55 | static void aes_encrypt_native(cipher_ctx_t ctx, cipher_length_t length, |
56 | uint8_t *dst, const uint8_t *src) | |
57 | { | |
58 | const QCryptoNettleAES *aesctx = ctx; | |
59 | aes_encrypt(&aesctx->enc, length, dst, src); | |
60 | } | |
61 | ||
62 | static void aes_decrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
63 | uint8_t *dst, const uint8_t *src) | |
64 | { | |
65 | const QCryptoNettleAES *aesctx = ctx; | |
66 | aes_decrypt(&aesctx->dec, length, dst, src); | |
67 | } | |
68 | ||
69 | static void des_encrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
70 | uint8_t *dst, const uint8_t *src) | |
71 | { | |
72 | des_encrypt(ctx, length, dst, src); | |
73 | } | |
74 | ||
75 | static void des_decrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
76 | uint8_t *dst, const uint8_t *src) | |
77 | { | |
78 | des_decrypt(ctx, length, dst, src); | |
79 | } | |
80 | ||
81 | static void cast128_encrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
82 | uint8_t *dst, const uint8_t *src) | |
83 | { | |
84 | cast128_encrypt(ctx, length, dst, src); | |
85 | } | |
86 | ||
87 | static void cast128_decrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
88 | uint8_t *dst, const uint8_t *src) | |
89 | { | |
90 | cast128_decrypt(ctx, length, dst, src); | |
91 | } | |
92 | ||
93 | static void serpent_encrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
94 | uint8_t *dst, const uint8_t *src) | |
95 | { | |
96 | serpent_encrypt(ctx, length, dst, src); | |
97 | } | |
98 | ||
99 | static void serpent_decrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
100 | uint8_t *dst, const uint8_t *src) | |
101 | { | |
102 | serpent_decrypt(ctx, length, dst, src); | |
103 | } | |
104 | ||
105 | static void twofish_encrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
106 | uint8_t *dst, const uint8_t *src) | |
107 | { | |
108 | twofish_encrypt(ctx, length, dst, src); | |
109 | } | |
110 | ||
111 | static void twofish_decrypt_native(cipher_ctx_t ctx, cipher_length_t length, | |
112 | uint8_t *dst, const uint8_t *src) | |
113 | { | |
114 | twofish_decrypt(ctx, length, dst, src); | |
115 | } | |
116 | ||
117 | static void aes_encrypt_wrapper(const void *ctx, size_t length, | |
d3462e37 RK |
118 | uint8_t *dst, const uint8_t *src) |
119 | { | |
e3ba0b67 DB |
120 | const QCryptoNettleAES *aesctx = ctx; |
121 | aes_encrypt(&aesctx->enc, length, dst, src); | |
d3462e37 RK |
122 | } |
123 | ||
f7ac78cf | 124 | static void aes_decrypt_wrapper(const void *ctx, size_t length, |
d3462e37 RK |
125 | uint8_t *dst, const uint8_t *src) |
126 | { | |
e3ba0b67 DB |
127 | const QCryptoNettleAES *aesctx = ctx; |
128 | aes_decrypt(&aesctx->dec, length, dst, src); | |
d3462e37 RK |
129 | } |
130 | ||
f7ac78cf | 131 | static void des_encrypt_wrapper(const void *ctx, size_t length, |
d3462e37 RK |
132 | uint8_t *dst, const uint8_t *src) |
133 | { | |
134 | des_encrypt(ctx, length, dst, src); | |
135 | } | |
136 | ||
f7ac78cf | 137 | static void des_decrypt_wrapper(const void *ctx, size_t length, |
d3462e37 RK |
138 | uint8_t *dst, const uint8_t *src) |
139 | { | |
140 | des_decrypt(ctx, length, dst, src); | |
141 | } | |
142 | ||
f7ac78cf | 143 | static void cast128_encrypt_wrapper(const void *ctx, size_t length, |
084a85ee DB |
144 | uint8_t *dst, const uint8_t *src) |
145 | { | |
146 | cast128_encrypt(ctx, length, dst, src); | |
147 | } | |
148 | ||
f7ac78cf | 149 | static void cast128_decrypt_wrapper(const void *ctx, size_t length, |
084a85ee DB |
150 | uint8_t *dst, const uint8_t *src) |
151 | { | |
152 | cast128_decrypt(ctx, length, dst, src); | |
153 | } | |
154 | ||
f7ac78cf | 155 | static void serpent_encrypt_wrapper(const void *ctx, size_t length, |
94318522 DB |
156 | uint8_t *dst, const uint8_t *src) |
157 | { | |
158 | serpent_encrypt(ctx, length, dst, src); | |
159 | } | |
160 | ||
f7ac78cf | 161 | static void serpent_decrypt_wrapper(const void *ctx, size_t length, |
94318522 DB |
162 | uint8_t *dst, const uint8_t *src) |
163 | { | |
164 | serpent_decrypt(ctx, length, dst, src); | |
165 | } | |
166 | ||
f7ac78cf | 167 | static void twofish_encrypt_wrapper(const void *ctx, size_t length, |
50f6753e DB |
168 | uint8_t *dst, const uint8_t *src) |
169 | { | |
170 | twofish_encrypt(ctx, length, dst, src); | |
171 | } | |
172 | ||
f7ac78cf | 173 | static void twofish_decrypt_wrapper(const void *ctx, size_t length, |
50f6753e DB |
174 | uint8_t *dst, const uint8_t *src) |
175 | { | |
176 | twofish_decrypt(ctx, length, dst, src); | |
177 | } | |
178 | ||
ed754746 DB |
179 | typedef struct QCryptoCipherNettle QCryptoCipherNettle; |
180 | struct QCryptoCipherNettle { | |
eaec903c | 181 | /* Primary cipher context for all modes */ |
e3ba0b67 | 182 | void *ctx; |
eaec903c DB |
183 | /* Second cipher context for XTS mode only */ |
184 | void *ctx_tweak; | |
185 | /* Cipher callbacks for both contexts */ | |
f7ac78cf DB |
186 | QCryptoCipherNettleFuncNative alg_encrypt_native; |
187 | QCryptoCipherNettleFuncNative alg_decrypt_native; | |
188 | QCryptoCipherNettleFuncWrapper alg_encrypt_wrapper; | |
189 | QCryptoCipherNettleFuncWrapper alg_decrypt_wrapper; | |
3c28292f | 190 | /* Initialization vector or Counter */ |
ed754746 | 191 | uint8_t *iv; |
3a661f1e | 192 | size_t blocksize; |
ed754746 DB |
193 | }; |
194 | ||
f844836d GA |
195 | bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg, |
196 | QCryptoCipherMode mode) | |
ed754746 DB |
197 | { |
198 | switch (alg) { | |
199 | case QCRYPTO_CIPHER_ALG_DES_RFB: | |
200 | case QCRYPTO_CIPHER_ALG_AES_128: | |
201 | case QCRYPTO_CIPHER_ALG_AES_192: | |
202 | case QCRYPTO_CIPHER_ALG_AES_256: | |
084a85ee | 203 | case QCRYPTO_CIPHER_ALG_CAST5_128: |
94318522 DB |
204 | case QCRYPTO_CIPHER_ALG_SERPENT_128: |
205 | case QCRYPTO_CIPHER_ALG_SERPENT_192: | |
206 | case QCRYPTO_CIPHER_ALG_SERPENT_256: | |
50f6753e DB |
207 | case QCRYPTO_CIPHER_ALG_TWOFISH_128: |
208 | case QCRYPTO_CIPHER_ALG_TWOFISH_192: | |
209 | case QCRYPTO_CIPHER_ALG_TWOFISH_256: | |
f844836d GA |
210 | break; |
211 | default: | |
212 | return false; | |
213 | } | |
214 | ||
215 | switch (mode) { | |
216 | case QCRYPTO_CIPHER_MODE_ECB: | |
217 | case QCRYPTO_CIPHER_MODE_CBC: | |
218 | case QCRYPTO_CIPHER_MODE_XTS: | |
219 | case QCRYPTO_CIPHER_MODE_CTR: | |
ed754746 DB |
220 | return true; |
221 | default: | |
222 | return false; | |
223 | } | |
224 | } | |
225 | ||
226 | ||
227 | QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, | |
228 | QCryptoCipherMode mode, | |
229 | const uint8_t *key, size_t nkey, | |
230 | Error **errp) | |
231 | { | |
232 | QCryptoCipher *cipher; | |
233 | QCryptoCipherNettle *ctx; | |
234 | uint8_t *rfbkey; | |
235 | ||
236 | switch (mode) { | |
237 | case QCRYPTO_CIPHER_MODE_ECB: | |
238 | case QCRYPTO_CIPHER_MODE_CBC: | |
eaec903c | 239 | case QCRYPTO_CIPHER_MODE_XTS: |
3c28292f | 240 | case QCRYPTO_CIPHER_MODE_CTR: |
ed754746 DB |
241 | break; |
242 | default: | |
90d6f60d DB |
243 | error_setg(errp, "Unsupported cipher mode %s", |
244 | QCryptoCipherMode_lookup[mode]); | |
ed754746 DB |
245 | return NULL; |
246 | } | |
247 | ||
eaec903c | 248 | if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) { |
ed754746 DB |
249 | return NULL; |
250 | } | |
251 | ||
252 | cipher = g_new0(QCryptoCipher, 1); | |
253 | cipher->alg = alg; | |
254 | cipher->mode = mode; | |
255 | ||
256 | ctx = g_new0(QCryptoCipherNettle, 1); | |
257 | ||
258 | switch (alg) { | |
259 | case QCRYPTO_CIPHER_ALG_DES_RFB: | |
e3ba0b67 | 260 | ctx->ctx = g_new0(struct des_ctx, 1); |
ed754746 | 261 | rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey); |
e3ba0b67 | 262 | des_set_key(ctx->ctx, rfbkey); |
ed754746 DB |
263 | g_free(rfbkey); |
264 | ||
f7ac78cf DB |
265 | ctx->alg_encrypt_native = des_encrypt_native; |
266 | ctx->alg_decrypt_native = des_decrypt_native; | |
267 | ctx->alg_encrypt_wrapper = des_encrypt_wrapper; | |
268 | ctx->alg_decrypt_wrapper = des_decrypt_wrapper; | |
ed754746 | 269 | |
3a661f1e | 270 | ctx->blocksize = DES_BLOCK_SIZE; |
ed754746 DB |
271 | break; |
272 | ||
273 | case QCRYPTO_CIPHER_ALG_AES_128: | |
274 | case QCRYPTO_CIPHER_ALG_AES_192: | |
275 | case QCRYPTO_CIPHER_ALG_AES_256: | |
e3ba0b67 | 276 | ctx->ctx = g_new0(QCryptoNettleAES, 1); |
ed754746 | 277 | |
eaec903c DB |
278 | if (mode == QCRYPTO_CIPHER_MODE_XTS) { |
279 | ctx->ctx_tweak = g_new0(QCryptoNettleAES, 1); | |
280 | ||
281 | nkey /= 2; | |
282 | aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc, | |
283 | nkey, key); | |
284 | aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec, | |
285 | nkey, key); | |
286 | ||
287 | aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->enc, | |
288 | nkey, key + nkey); | |
289 | aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->dec, | |
290 | nkey, key + nkey); | |
291 | } else { | |
292 | aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc, | |
293 | nkey, key); | |
294 | aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec, | |
295 | nkey, key); | |
296 | } | |
ed754746 | 297 | |
f7ac78cf DB |
298 | ctx->alg_encrypt_native = aes_encrypt_native; |
299 | ctx->alg_decrypt_native = aes_decrypt_native; | |
300 | ctx->alg_encrypt_wrapper = aes_encrypt_wrapper; | |
301 | ctx->alg_decrypt_wrapper = aes_decrypt_wrapper; | |
ed754746 | 302 | |
3a661f1e | 303 | ctx->blocksize = AES_BLOCK_SIZE; |
ed754746 | 304 | break; |
084a85ee DB |
305 | |
306 | case QCRYPTO_CIPHER_ALG_CAST5_128: | |
e3ba0b67 | 307 | ctx->ctx = g_new0(struct cast128_ctx, 1); |
084a85ee | 308 | |
eaec903c DB |
309 | if (mode == QCRYPTO_CIPHER_MODE_XTS) { |
310 | ctx->ctx_tweak = g_new0(struct cast128_ctx, 1); | |
311 | ||
312 | nkey /= 2; | |
313 | cast5_set_key(ctx->ctx, nkey, key); | |
314 | cast5_set_key(ctx->ctx_tweak, nkey, key + nkey); | |
315 | } else { | |
316 | cast5_set_key(ctx->ctx, nkey, key); | |
317 | } | |
084a85ee | 318 | |
f7ac78cf DB |
319 | ctx->alg_encrypt_native = cast128_encrypt_native; |
320 | ctx->alg_decrypt_native = cast128_decrypt_native; | |
321 | ctx->alg_encrypt_wrapper = cast128_encrypt_wrapper; | |
322 | ctx->alg_decrypt_wrapper = cast128_decrypt_wrapper; | |
084a85ee DB |
323 | |
324 | ctx->blocksize = CAST128_BLOCK_SIZE; | |
325 | break; | |
94318522 DB |
326 | |
327 | case QCRYPTO_CIPHER_ALG_SERPENT_128: | |
328 | case QCRYPTO_CIPHER_ALG_SERPENT_192: | |
329 | case QCRYPTO_CIPHER_ALG_SERPENT_256: | |
e3ba0b67 | 330 | ctx->ctx = g_new0(struct serpent_ctx, 1); |
94318522 | 331 | |
eaec903c DB |
332 | if (mode == QCRYPTO_CIPHER_MODE_XTS) { |
333 | ctx->ctx_tweak = g_new0(struct serpent_ctx, 1); | |
334 | ||
335 | nkey /= 2; | |
336 | serpent_set_key(ctx->ctx, nkey, key); | |
337 | serpent_set_key(ctx->ctx_tweak, nkey, key + nkey); | |
338 | } else { | |
339 | serpent_set_key(ctx->ctx, nkey, key); | |
340 | } | |
94318522 | 341 | |
f7ac78cf DB |
342 | ctx->alg_encrypt_native = serpent_encrypt_native; |
343 | ctx->alg_decrypt_native = serpent_decrypt_native; | |
344 | ctx->alg_encrypt_wrapper = serpent_encrypt_wrapper; | |
345 | ctx->alg_decrypt_wrapper = serpent_decrypt_wrapper; | |
94318522 DB |
346 | |
347 | ctx->blocksize = SERPENT_BLOCK_SIZE; | |
348 | break; | |
349 | ||
50f6753e DB |
350 | case QCRYPTO_CIPHER_ALG_TWOFISH_128: |
351 | case QCRYPTO_CIPHER_ALG_TWOFISH_192: | |
352 | case QCRYPTO_CIPHER_ALG_TWOFISH_256: | |
e3ba0b67 | 353 | ctx->ctx = g_new0(struct twofish_ctx, 1); |
50f6753e | 354 | |
eaec903c DB |
355 | if (mode == QCRYPTO_CIPHER_MODE_XTS) { |
356 | ctx->ctx_tweak = g_new0(struct twofish_ctx, 1); | |
357 | ||
358 | nkey /= 2; | |
359 | twofish_set_key(ctx->ctx, nkey, key); | |
360 | twofish_set_key(ctx->ctx_tweak, nkey, key + nkey); | |
361 | } else { | |
362 | twofish_set_key(ctx->ctx, nkey, key); | |
363 | } | |
50f6753e | 364 | |
f7ac78cf DB |
365 | ctx->alg_encrypt_native = twofish_encrypt_native; |
366 | ctx->alg_decrypt_native = twofish_decrypt_native; | |
367 | ctx->alg_encrypt_wrapper = twofish_encrypt_wrapper; | |
368 | ctx->alg_decrypt_wrapper = twofish_decrypt_wrapper; | |
50f6753e DB |
369 | |
370 | ctx->blocksize = TWOFISH_BLOCK_SIZE; | |
371 | break; | |
372 | ||
ed754746 | 373 | default: |
90d6f60d DB |
374 | error_setg(errp, "Unsupported cipher algorithm %s", |
375 | QCryptoCipherAlgorithm_lookup[alg]); | |
ed754746 DB |
376 | goto error; |
377 | } | |
378 | ||
a5d2f44d DB |
379 | if (mode == QCRYPTO_CIPHER_MODE_XTS && |
380 | ctx->blocksize != XTS_BLOCK_SIZE) { | |
381 | error_setg(errp, "Cipher block size %zu must equal XTS block size %d", | |
382 | ctx->blocksize, XTS_BLOCK_SIZE); | |
383 | goto error; | |
384 | } | |
385 | ||
3a661f1e | 386 | ctx->iv = g_new0(uint8_t, ctx->blocksize); |
ed754746 DB |
387 | cipher->opaque = ctx; |
388 | ||
389 | return cipher; | |
390 | ||
391 | error: | |
392 | g_free(cipher); | |
393 | g_free(ctx); | |
394 | return NULL; | |
395 | } | |
396 | ||
397 | ||
398 | void qcrypto_cipher_free(QCryptoCipher *cipher) | |
399 | { | |
400 | QCryptoCipherNettle *ctx; | |
401 | ||
402 | if (!cipher) { | |
403 | return; | |
404 | } | |
405 | ||
406 | ctx = cipher->opaque; | |
407 | g_free(ctx->iv); | |
e3ba0b67 | 408 | g_free(ctx->ctx); |
eaec903c | 409 | g_free(ctx->ctx_tweak); |
ed754746 DB |
410 | g_free(ctx); |
411 | g_free(cipher); | |
412 | } | |
413 | ||
414 | ||
415 | int qcrypto_cipher_encrypt(QCryptoCipher *cipher, | |
416 | const void *in, | |
417 | void *out, | |
418 | size_t len, | |
419 | Error **errp) | |
420 | { | |
421 | QCryptoCipherNettle *ctx = cipher->opaque; | |
422 | ||
3a661f1e DB |
423 | if (len % ctx->blocksize) { |
424 | error_setg(errp, "Length %zu must be a multiple of block size %zu", | |
425 | len, ctx->blocksize); | |
426 | return -1; | |
427 | } | |
428 | ||
ed754746 DB |
429 | switch (cipher->mode) { |
430 | case QCRYPTO_CIPHER_MODE_ECB: | |
f7ac78cf | 431 | ctx->alg_encrypt_wrapper(ctx->ctx, len, out, in); |
ed754746 DB |
432 | break; |
433 | ||
434 | case QCRYPTO_CIPHER_MODE_CBC: | |
f7ac78cf | 435 | cbc_encrypt(ctx->ctx, ctx->alg_encrypt_native, |
3a661f1e | 436 | ctx->blocksize, ctx->iv, |
ed754746 DB |
437 | len, out, in); |
438 | break; | |
e3ba0b67 | 439 | |
eaec903c DB |
440 | case QCRYPTO_CIPHER_MODE_XTS: |
441 | xts_encrypt(ctx->ctx, ctx->ctx_tweak, | |
f7ac78cf | 442 | ctx->alg_encrypt_wrapper, ctx->alg_encrypt_wrapper, |
eaec903c DB |
443 | ctx->iv, len, out, in); |
444 | break; | |
445 | ||
3c28292f GA |
446 | case QCRYPTO_CIPHER_MODE_CTR: |
447 | ctr_crypt(ctx->ctx, ctx->alg_encrypt_native, | |
448 | ctx->blocksize, ctx->iv, | |
449 | len, out, in); | |
450 | break; | |
451 | ||
ed754746 | 452 | default: |
90d6f60d DB |
453 | error_setg(errp, "Unsupported cipher mode %s", |
454 | QCryptoCipherMode_lookup[cipher->mode]); | |
ed754746 DB |
455 | return -1; |
456 | } | |
457 | return 0; | |
458 | } | |
459 | ||
460 | ||
461 | int qcrypto_cipher_decrypt(QCryptoCipher *cipher, | |
462 | const void *in, | |
463 | void *out, | |
464 | size_t len, | |
465 | Error **errp) | |
466 | { | |
467 | QCryptoCipherNettle *ctx = cipher->opaque; | |
468 | ||
3a661f1e DB |
469 | if (len % ctx->blocksize) { |
470 | error_setg(errp, "Length %zu must be a multiple of block size %zu", | |
471 | len, ctx->blocksize); | |
472 | return -1; | |
473 | } | |
474 | ||
ed754746 DB |
475 | switch (cipher->mode) { |
476 | case QCRYPTO_CIPHER_MODE_ECB: | |
f7ac78cf | 477 | ctx->alg_decrypt_wrapper(ctx->ctx, len, out, in); |
ed754746 DB |
478 | break; |
479 | ||
480 | case QCRYPTO_CIPHER_MODE_CBC: | |
f7ac78cf | 481 | cbc_decrypt(ctx->ctx, ctx->alg_decrypt_native, |
e3ba0b67 | 482 | ctx->blocksize, ctx->iv, |
ed754746 DB |
483 | len, out, in); |
484 | break; | |
e3ba0b67 | 485 | |
eaec903c | 486 | case QCRYPTO_CIPHER_MODE_XTS: |
eaec903c | 487 | xts_decrypt(ctx->ctx, ctx->ctx_tweak, |
f7ac78cf | 488 | ctx->alg_encrypt_wrapper, ctx->alg_decrypt_wrapper, |
eaec903c DB |
489 | ctx->iv, len, out, in); |
490 | break; | |
3c28292f GA |
491 | case QCRYPTO_CIPHER_MODE_CTR: |
492 | ctr_crypt(ctx->ctx, ctx->alg_encrypt_native, | |
493 | ctx->blocksize, ctx->iv, | |
494 | len, out, in); | |
495 | break; | |
eaec903c | 496 | |
ed754746 | 497 | default: |
90d6f60d DB |
498 | error_setg(errp, "Unsupported cipher mode %s", |
499 | QCryptoCipherMode_lookup[cipher->mode]); | |
ed754746 DB |
500 | return -1; |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
505 | int qcrypto_cipher_setiv(QCryptoCipher *cipher, | |
506 | const uint8_t *iv, size_t niv, | |
507 | Error **errp) | |
508 | { | |
509 | QCryptoCipherNettle *ctx = cipher->opaque; | |
3a661f1e | 510 | if (niv != ctx->blocksize) { |
ed754746 | 511 | error_setg(errp, "Expected IV size %zu not %zu", |
3a661f1e | 512 | ctx->blocksize, niv); |
ed754746 DB |
513 | return -1; |
514 | } | |
515 | memcpy(ctx->iv, iv, niv); | |
516 | return 0; | |
517 | } |