gcm.c 30 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * GCM: Galois/Counter Mode.
  4. *
  5. * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
  6. */
  7. #include <crypto/gf128mul.h>
  8. #include <crypto/internal/aead.h>
  9. #include <crypto/internal/skcipher.h>
  10. #include <crypto/internal/hash.h>
  11. #include <crypto/null.h>
  12. #include <crypto/scatterwalk.h>
  13. #include <crypto/gcm.h>
  14. #include <crypto/hash.h>
  15. #include <linux/err.h>
  16. #include <linux/init.h>
  17. #include <linux/kernel.h>
  18. #include <linux/module.h>
  19. #include <linux/slab.h>
  20. struct gcm_instance_ctx {
  21. struct crypto_skcipher_spawn ctr;
  22. struct crypto_ahash_spawn ghash;
  23. };
  24. struct crypto_gcm_ctx {
  25. struct crypto_skcipher *ctr;
  26. struct crypto_ahash *ghash;
  27. };
  28. struct crypto_rfc4106_ctx {
  29. struct crypto_aead *child;
  30. u8 nonce[4];
  31. };
  32. struct crypto_rfc4106_req_ctx {
  33. struct scatterlist src[3];
  34. struct scatterlist dst[3];
  35. struct aead_request subreq;
  36. };
  37. struct crypto_rfc4543_instance_ctx {
  38. struct crypto_aead_spawn aead;
  39. };
  40. struct crypto_rfc4543_ctx {
  41. struct crypto_aead *child;
  42. struct crypto_sync_skcipher *null;
  43. u8 nonce[4];
  44. };
  45. struct crypto_rfc4543_req_ctx {
  46. struct aead_request subreq;
  47. };
  48. struct crypto_gcm_ghash_ctx {
  49. unsigned int cryptlen;
  50. struct scatterlist *src;
  51. int (*complete)(struct aead_request *req, u32 flags);
  52. };
  53. struct crypto_gcm_req_priv_ctx {
  54. u8 iv[16];
  55. u8 auth_tag[16];
  56. u8 iauth_tag[16];
  57. struct scatterlist src[3];
  58. struct scatterlist dst[3];
  59. struct scatterlist sg;
  60. struct crypto_gcm_ghash_ctx ghash_ctx;
  61. union {
  62. struct ahash_request ahreq;
  63. struct skcipher_request skreq;
  64. } u;
  65. };
  66. static struct {
  67. u8 buf[16];
  68. struct scatterlist sg;
  69. } *gcm_zeroes;
  70. static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
  71. static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  72. struct aead_request *req)
  73. {
  74. unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  75. return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  76. }
  77. static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
  78. unsigned int keylen)
  79. {
  80. struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
  81. struct crypto_ahash *ghash = ctx->ghash;
  82. struct crypto_skcipher *ctr = ctx->ctr;
  83. struct {
  84. be128 hash;
  85. u8 iv[16];
  86. struct crypto_wait wait;
  87. struct scatterlist sg[1];
  88. struct skcipher_request req;
  89. } *data;
  90. int err;
  91. crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
  92. crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
  93. CRYPTO_TFM_REQ_MASK);
  94. err = crypto_skcipher_setkey(ctr, key, keylen);
  95. if (err)
  96. return err;
  97. data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
  98. GFP_KERNEL);
  99. if (!data)
  100. return -ENOMEM;
  101. crypto_init_wait(&data->wait);
  102. sg_init_one(data->sg, &data->hash, sizeof(data->hash));
  103. skcipher_request_set_tfm(&data->req, ctr);
  104. skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
  105. CRYPTO_TFM_REQ_MAY_BACKLOG,
  106. crypto_req_done,
  107. &data->wait);
  108. skcipher_request_set_crypt(&data->req, data->sg, data->sg,
  109. sizeof(data->hash), data->iv);
  110. err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
  111. &data->wait);
  112. if (err)
  113. goto out;
  114. crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
  115. crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
  116. CRYPTO_TFM_REQ_MASK);
  117. err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
  118. out:
  119. kfree_sensitive(data);
  120. return err;
  121. }
  122. static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
  123. unsigned int authsize)
  124. {
  125. return crypto_gcm_check_authsize(authsize);
  126. }
  127. static void crypto_gcm_init_common(struct aead_request *req)
  128. {
  129. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  130. __be32 counter = cpu_to_be32(1);
  131. struct scatterlist *sg;
  132. memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
  133. memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
  134. memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
  135. sg_init_table(pctx->src, 3);
  136. sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
  137. sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
  138. if (sg != pctx->src + 1)
  139. sg_chain(pctx->src, 2, sg);
  140. if (req->src != req->dst) {
  141. sg_init_table(pctx->dst, 3);
  142. sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
  143. sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
  144. if (sg != pctx->dst + 1)
  145. sg_chain(pctx->dst, 2, sg);
  146. }
  147. }
  148. static void crypto_gcm_init_crypt(struct aead_request *req,
  149. unsigned int cryptlen)
  150. {
  151. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  152. struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
  153. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  154. struct skcipher_request *skreq = &pctx->u.skreq;
  155. struct scatterlist *dst;
  156. dst = req->src == req->dst ? pctx->src : pctx->dst;
  157. skcipher_request_set_tfm(skreq, ctx->ctr);
  158. skcipher_request_set_crypt(skreq, pctx->src, dst,
  159. cryptlen + sizeof(pctx->auth_tag),
  160. pctx->iv);
  161. }
  162. static inline unsigned int gcm_remain(unsigned int len)
  163. {
  164. len &= 0xfU;
  165. return len ? 16 - len : 0;
  166. }
  167. static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
  168. static int gcm_hash_update(struct aead_request *req,
  169. crypto_completion_t compl,
  170. struct scatterlist *src,
  171. unsigned int len, u32 flags)
  172. {
  173. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  174. struct ahash_request *ahreq = &pctx->u.ahreq;
  175. ahash_request_set_callback(ahreq, flags, compl, req);
  176. ahash_request_set_crypt(ahreq, src, NULL, len);
  177. return crypto_ahash_update(ahreq);
  178. }
  179. static int gcm_hash_remain(struct aead_request *req,
  180. unsigned int remain,
  181. crypto_completion_t compl, u32 flags)
  182. {
  183. return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
  184. }
  185. static int gcm_hash_len(struct aead_request *req, u32 flags)
  186. {
  187. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  188. struct ahash_request *ahreq = &pctx->u.ahreq;
  189. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  190. be128 lengths;
  191. lengths.a = cpu_to_be64(req->assoclen * 8);
  192. lengths.b = cpu_to_be64(gctx->cryptlen * 8);
  193. memcpy(pctx->iauth_tag, &lengths, 16);
  194. sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
  195. ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
  196. ahash_request_set_crypt(ahreq, &pctx->sg,
  197. pctx->iauth_tag, sizeof(lengths));
  198. return crypto_ahash_finup(ahreq);
  199. }
  200. static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
  201. {
  202. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  203. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  204. return gctx->complete(req, flags);
  205. }
  206. static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
  207. {
  208. struct aead_request *req = areq->data;
  209. if (err)
  210. goto out;
  211. err = gcm_hash_len_continue(req, 0);
  212. if (err == -EINPROGRESS)
  213. return;
  214. out:
  215. aead_request_complete(req, err);
  216. }
  217. static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
  218. {
  219. return gcm_hash_len(req, flags) ?:
  220. gcm_hash_len_continue(req, flags);
  221. }
  222. static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
  223. int err)
  224. {
  225. struct aead_request *req = areq->data;
  226. if (err)
  227. goto out;
  228. err = gcm_hash_crypt_remain_continue(req, 0);
  229. if (err == -EINPROGRESS)
  230. return;
  231. out:
  232. aead_request_complete(req, err);
  233. }
  234. static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
  235. {
  236. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  237. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  238. unsigned int remain;
  239. remain = gcm_remain(gctx->cryptlen);
  240. if (remain)
  241. return gcm_hash_remain(req, remain,
  242. gcm_hash_crypt_remain_done, flags) ?:
  243. gcm_hash_crypt_remain_continue(req, flags);
  244. return gcm_hash_crypt_remain_continue(req, flags);
  245. }
  246. static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
  247. {
  248. struct aead_request *req = areq->data;
  249. if (err)
  250. goto out;
  251. err = gcm_hash_crypt_continue(req, 0);
  252. if (err == -EINPROGRESS)
  253. return;
  254. out:
  255. aead_request_complete(req, err);
  256. }
  257. static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
  258. {
  259. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  260. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  261. if (gctx->cryptlen)
  262. return gcm_hash_update(req, gcm_hash_crypt_done,
  263. gctx->src, gctx->cryptlen, flags) ?:
  264. gcm_hash_crypt_continue(req, flags);
  265. return gcm_hash_crypt_remain_continue(req, flags);
  266. }
  267. static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
  268. int err)
  269. {
  270. struct aead_request *req = areq->data;
  271. if (err)
  272. goto out;
  273. err = gcm_hash_assoc_remain_continue(req, 0);
  274. if (err == -EINPROGRESS)
  275. return;
  276. out:
  277. aead_request_complete(req, err);
  278. }
  279. static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
  280. {
  281. unsigned int remain;
  282. remain = gcm_remain(req->assoclen);
  283. if (remain)
  284. return gcm_hash_remain(req, remain,
  285. gcm_hash_assoc_remain_done, flags) ?:
  286. gcm_hash_assoc_remain_continue(req, flags);
  287. return gcm_hash_assoc_remain_continue(req, flags);
  288. }
  289. static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
  290. {
  291. struct aead_request *req = areq->data;
  292. if (err)
  293. goto out;
  294. err = gcm_hash_assoc_continue(req, 0);
  295. if (err == -EINPROGRESS)
  296. return;
  297. out:
  298. aead_request_complete(req, err);
  299. }
  300. static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
  301. {
  302. if (req->assoclen)
  303. return gcm_hash_update(req, gcm_hash_assoc_done,
  304. req->src, req->assoclen, flags) ?:
  305. gcm_hash_assoc_continue(req, flags);
  306. return gcm_hash_assoc_remain_continue(req, flags);
  307. }
  308. static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
  309. {
  310. struct aead_request *req = areq->data;
  311. if (err)
  312. goto out;
  313. err = gcm_hash_init_continue(req, 0);
  314. if (err == -EINPROGRESS)
  315. return;
  316. out:
  317. aead_request_complete(req, err);
  318. }
  319. static int gcm_hash(struct aead_request *req, u32 flags)
  320. {
  321. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  322. struct ahash_request *ahreq = &pctx->u.ahreq;
  323. struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
  324. ahash_request_set_tfm(ahreq, ctx->ghash);
  325. ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
  326. return crypto_ahash_init(ahreq) ?:
  327. gcm_hash_init_continue(req, flags);
  328. }
  329. static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
  330. {
  331. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  332. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  333. u8 *auth_tag = pctx->auth_tag;
  334. crypto_xor(auth_tag, pctx->iauth_tag, 16);
  335. scatterwalk_map_and_copy(auth_tag, req->dst,
  336. req->assoclen + req->cryptlen,
  337. crypto_aead_authsize(aead), 1);
  338. return 0;
  339. }
  340. static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
  341. {
  342. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  343. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  344. gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
  345. gctx->cryptlen = req->cryptlen;
  346. gctx->complete = gcm_enc_copy_hash;
  347. return gcm_hash(req, flags);
  348. }
  349. static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
  350. {
  351. struct aead_request *req = areq->data;
  352. if (err)
  353. goto out;
  354. err = gcm_encrypt_continue(req, 0);
  355. if (err == -EINPROGRESS)
  356. return;
  357. out:
  358. aead_request_complete(req, err);
  359. }
  360. static int crypto_gcm_encrypt(struct aead_request *req)
  361. {
  362. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  363. struct skcipher_request *skreq = &pctx->u.skreq;
  364. u32 flags = aead_request_flags(req);
  365. crypto_gcm_init_common(req);
  366. crypto_gcm_init_crypt(req, req->cryptlen);
  367. skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
  368. return crypto_skcipher_encrypt(skreq) ?:
  369. gcm_encrypt_continue(req, flags);
  370. }
  371. static int crypto_gcm_verify(struct aead_request *req)
  372. {
  373. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  374. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  375. u8 *auth_tag = pctx->auth_tag;
  376. u8 *iauth_tag = pctx->iauth_tag;
  377. unsigned int authsize = crypto_aead_authsize(aead);
  378. unsigned int cryptlen = req->cryptlen - authsize;
  379. crypto_xor(auth_tag, iauth_tag, 16);
  380. scatterwalk_map_and_copy(iauth_tag, req->src,
  381. req->assoclen + cryptlen, authsize, 0);
  382. return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
  383. }
  384. static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
  385. {
  386. struct aead_request *req = areq->data;
  387. if (!err)
  388. err = crypto_gcm_verify(req);
  389. aead_request_complete(req, err);
  390. }
  391. static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
  392. {
  393. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  394. struct skcipher_request *skreq = &pctx->u.skreq;
  395. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  396. crypto_gcm_init_crypt(req, gctx->cryptlen);
  397. skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
  398. return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
  399. }
  400. static int crypto_gcm_decrypt(struct aead_request *req)
  401. {
  402. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  403. struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
  404. struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
  405. unsigned int authsize = crypto_aead_authsize(aead);
  406. unsigned int cryptlen = req->cryptlen;
  407. u32 flags = aead_request_flags(req);
  408. cryptlen -= authsize;
  409. crypto_gcm_init_common(req);
  410. gctx->src = sg_next(pctx->src);
  411. gctx->cryptlen = cryptlen;
  412. gctx->complete = gcm_dec_hash_continue;
  413. return gcm_hash(req, flags);
  414. }
  415. static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
  416. {
  417. struct aead_instance *inst = aead_alg_instance(tfm);
  418. struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
  419. struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
  420. struct crypto_skcipher *ctr;
  421. struct crypto_ahash *ghash;
  422. unsigned long align;
  423. int err;
  424. ghash = crypto_spawn_ahash(&ictx->ghash);
  425. if (IS_ERR(ghash))
  426. return PTR_ERR(ghash);
  427. ctr = crypto_spawn_skcipher(&ictx->ctr);
  428. err = PTR_ERR(ctr);
  429. if (IS_ERR(ctr))
  430. goto err_free_hash;
  431. ctx->ctr = ctr;
  432. ctx->ghash = ghash;
  433. align = crypto_aead_alignmask(tfm);
  434. align &= ~(crypto_tfm_ctx_alignment() - 1);
  435. crypto_aead_set_reqsize(tfm,
  436. align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
  437. max(sizeof(struct skcipher_request) +
  438. crypto_skcipher_reqsize(ctr),
  439. sizeof(struct ahash_request) +
  440. crypto_ahash_reqsize(ghash)));
  441. return 0;
  442. err_free_hash:
  443. crypto_free_ahash(ghash);
  444. return err;
  445. }
  446. static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
  447. {
  448. struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
  449. crypto_free_ahash(ctx->ghash);
  450. crypto_free_skcipher(ctx->ctr);
  451. }
  452. static void crypto_gcm_free(struct aead_instance *inst)
  453. {
  454. struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
  455. crypto_drop_skcipher(&ctx->ctr);
  456. crypto_drop_ahash(&ctx->ghash);
  457. kfree(inst);
  458. }
  459. static int crypto_gcm_create_common(struct crypto_template *tmpl,
  460. struct rtattr **tb,
  461. const char *ctr_name,
  462. const char *ghash_name)
  463. {
  464. u32 mask;
  465. struct aead_instance *inst;
  466. struct gcm_instance_ctx *ctx;
  467. struct skcipher_alg *ctr;
  468. struct hash_alg_common *ghash;
  469. int err;
  470. err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
  471. if (err)
  472. return err;
  473. inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
  474. if (!inst)
  475. return -ENOMEM;
  476. ctx = aead_instance_ctx(inst);
  477. err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
  478. ghash_name, 0, mask);
  479. if (err)
  480. goto err_free_inst;
  481. ghash = crypto_spawn_ahash_alg(&ctx->ghash);
  482. err = -EINVAL;
  483. if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
  484. ghash->digestsize != 16)
  485. goto err_free_inst;
  486. err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
  487. ctr_name, 0, mask);
  488. if (err)
  489. goto err_free_inst;
  490. ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
  491. /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
  492. err = -EINVAL;
  493. if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
  494. crypto_skcipher_alg_ivsize(ctr) != 16 ||
  495. ctr->base.cra_blocksize != 1)
  496. goto err_free_inst;
  497. err = -ENAMETOOLONG;
  498. if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
  499. "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
  500. goto err_free_inst;
  501. if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
  502. "gcm_base(%s,%s)", ctr->base.cra_driver_name,
  503. ghash->base.cra_driver_name) >=
  504. CRYPTO_MAX_ALG_NAME)
  505. goto err_free_inst;
  506. inst->alg.base.cra_priority = (ghash->base.cra_priority +
  507. ctr->base.cra_priority) / 2;
  508. inst->alg.base.cra_blocksize = 1;
  509. inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
  510. ctr->base.cra_alignmask;
  511. inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
  512. inst->alg.ivsize = GCM_AES_IV_SIZE;
  513. inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
  514. inst->alg.maxauthsize = 16;
  515. inst->alg.init = crypto_gcm_init_tfm;
  516. inst->alg.exit = crypto_gcm_exit_tfm;
  517. inst->alg.setkey = crypto_gcm_setkey;
  518. inst->alg.setauthsize = crypto_gcm_setauthsize;
  519. inst->alg.encrypt = crypto_gcm_encrypt;
  520. inst->alg.decrypt = crypto_gcm_decrypt;
  521. inst->free = crypto_gcm_free;
  522. err = aead_register_instance(tmpl, inst);
  523. if (err) {
  524. err_free_inst:
  525. crypto_gcm_free(inst);
  526. }
  527. return err;
  528. }
  529. static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
  530. {
  531. const char *cipher_name;
  532. char ctr_name[CRYPTO_MAX_ALG_NAME];
  533. cipher_name = crypto_attr_alg_name(tb[1]);
  534. if (IS_ERR(cipher_name))
  535. return PTR_ERR(cipher_name);
  536. if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
  537. CRYPTO_MAX_ALG_NAME)
  538. return -ENAMETOOLONG;
  539. return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
  540. }
  541. static int crypto_gcm_base_create(struct crypto_template *tmpl,
  542. struct rtattr **tb)
  543. {
  544. const char *ctr_name;
  545. const char *ghash_name;
  546. ctr_name = crypto_attr_alg_name(tb[1]);
  547. if (IS_ERR(ctr_name))
  548. return PTR_ERR(ctr_name);
  549. ghash_name = crypto_attr_alg_name(tb[2]);
  550. if (IS_ERR(ghash_name))
  551. return PTR_ERR(ghash_name);
  552. return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
  553. }
  554. static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
  555. unsigned int keylen)
  556. {
  557. struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
  558. struct crypto_aead *child = ctx->child;
  559. if (keylen < 4)
  560. return -EINVAL;
  561. keylen -= 4;
  562. memcpy(ctx->nonce, key + keylen, 4);
  563. crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
  564. crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
  565. CRYPTO_TFM_REQ_MASK);
  566. return crypto_aead_setkey(child, key, keylen);
  567. }
  568. static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
  569. unsigned int authsize)
  570. {
  571. struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
  572. int err;
  573. err = crypto_rfc4106_check_authsize(authsize);
  574. if (err)
  575. return err;
  576. return crypto_aead_setauthsize(ctx->child, authsize);
  577. }
  578. static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
  579. {
  580. struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
  581. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  582. struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
  583. struct aead_request *subreq = &rctx->subreq;
  584. struct crypto_aead *child = ctx->child;
  585. struct scatterlist *sg;
  586. u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
  587. crypto_aead_alignmask(child) + 1);
  588. scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
  589. memcpy(iv, ctx->nonce, 4);
  590. memcpy(iv + 4, req->iv, 8);
  591. sg_init_table(rctx->src, 3);
  592. sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
  593. sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
  594. if (sg != rctx->src + 1)
  595. sg_chain(rctx->src, 2, sg);
  596. if (req->src != req->dst) {
  597. sg_init_table(rctx->dst, 3);
  598. sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
  599. sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
  600. if (sg != rctx->dst + 1)
  601. sg_chain(rctx->dst, 2, sg);
  602. }
  603. aead_request_set_tfm(subreq, child);
  604. aead_request_set_callback(subreq, req->base.flags, req->base.complete,
  605. req->base.data);
  606. aead_request_set_crypt(subreq, rctx->src,
  607. req->src == req->dst ? rctx->src : rctx->dst,
  608. req->cryptlen, iv);
  609. aead_request_set_ad(subreq, req->assoclen - 8);
  610. return subreq;
  611. }
  612. static int crypto_rfc4106_encrypt(struct aead_request *req)
  613. {
  614. int err;
  615. err = crypto_ipsec_check_assoclen(req->assoclen);
  616. if (err)
  617. return err;
  618. req = crypto_rfc4106_crypt(req);
  619. return crypto_aead_encrypt(req);
  620. }
  621. static int crypto_rfc4106_decrypt(struct aead_request *req)
  622. {
  623. int err;
  624. err = crypto_ipsec_check_assoclen(req->assoclen);
  625. if (err)
  626. return err;
  627. req = crypto_rfc4106_crypt(req);
  628. return crypto_aead_decrypt(req);
  629. }
  630. static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
  631. {
  632. struct aead_instance *inst = aead_alg_instance(tfm);
  633. struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
  634. struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
  635. struct crypto_aead *aead;
  636. unsigned long align;
  637. aead = crypto_spawn_aead(spawn);
  638. if (IS_ERR(aead))
  639. return PTR_ERR(aead);
  640. ctx->child = aead;
  641. align = crypto_aead_alignmask(aead);
  642. align &= ~(crypto_tfm_ctx_alignment() - 1);
  643. crypto_aead_set_reqsize(
  644. tfm,
  645. sizeof(struct crypto_rfc4106_req_ctx) +
  646. ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
  647. align + 24);
  648. return 0;
  649. }
  650. static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
  651. {
  652. struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
  653. crypto_free_aead(ctx->child);
  654. }
  655. static void crypto_rfc4106_free(struct aead_instance *inst)
  656. {
  657. crypto_drop_aead(aead_instance_ctx(inst));
  658. kfree(inst);
  659. }
  660. static int crypto_rfc4106_create(struct crypto_template *tmpl,
  661. struct rtattr **tb)
  662. {
  663. u32 mask;
  664. struct aead_instance *inst;
  665. struct crypto_aead_spawn *spawn;
  666. struct aead_alg *alg;
  667. int err;
  668. err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
  669. if (err)
  670. return err;
  671. inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
  672. if (!inst)
  673. return -ENOMEM;
  674. spawn = aead_instance_ctx(inst);
  675. err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
  676. crypto_attr_alg_name(tb[1]), 0, mask);
  677. if (err)
  678. goto err_free_inst;
  679. alg = crypto_spawn_aead_alg(spawn);
  680. err = -EINVAL;
  681. /* Underlying IV size must be 12. */
  682. if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
  683. goto err_free_inst;
  684. /* Not a stream cipher? */
  685. if (alg->base.cra_blocksize != 1)
  686. goto err_free_inst;
  687. err = -ENAMETOOLONG;
  688. if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
  689. "rfc4106(%s)", alg->base.cra_name) >=
  690. CRYPTO_MAX_ALG_NAME ||
  691. snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
  692. "rfc4106(%s)", alg->base.cra_driver_name) >=
  693. CRYPTO_MAX_ALG_NAME)
  694. goto err_free_inst;
  695. inst->alg.base.cra_priority = alg->base.cra_priority;
  696. inst->alg.base.cra_blocksize = 1;
  697. inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
  698. inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
  699. inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
  700. inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
  701. inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
  702. inst->alg.init = crypto_rfc4106_init_tfm;
  703. inst->alg.exit = crypto_rfc4106_exit_tfm;
  704. inst->alg.setkey = crypto_rfc4106_setkey;
  705. inst->alg.setauthsize = crypto_rfc4106_setauthsize;
  706. inst->alg.encrypt = crypto_rfc4106_encrypt;
  707. inst->alg.decrypt = crypto_rfc4106_decrypt;
  708. inst->free = crypto_rfc4106_free;
  709. err = aead_register_instance(tmpl, inst);
  710. if (err) {
  711. err_free_inst:
  712. crypto_rfc4106_free(inst);
  713. }
  714. return err;
  715. }
  716. static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
  717. unsigned int keylen)
  718. {
  719. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
  720. struct crypto_aead *child = ctx->child;
  721. if (keylen < 4)
  722. return -EINVAL;
  723. keylen -= 4;
  724. memcpy(ctx->nonce, key + keylen, 4);
  725. crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
  726. crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
  727. CRYPTO_TFM_REQ_MASK);
  728. return crypto_aead_setkey(child, key, keylen);
  729. }
  730. static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
  731. unsigned int authsize)
  732. {
  733. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
  734. if (authsize != 16)
  735. return -EINVAL;
  736. return crypto_aead_setauthsize(ctx->child, authsize);
  737. }
  738. static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
  739. {
  740. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  741. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
  742. struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
  743. struct aead_request *subreq = &rctx->subreq;
  744. unsigned int authsize = crypto_aead_authsize(aead);
  745. u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
  746. crypto_aead_alignmask(ctx->child) + 1);
  747. int err;
  748. if (req->src != req->dst) {
  749. err = crypto_rfc4543_copy_src_to_dst(req, enc);
  750. if (err)
  751. return err;
  752. }
  753. memcpy(iv, ctx->nonce, 4);
  754. memcpy(iv + 4, req->iv, 8);
  755. aead_request_set_tfm(subreq, ctx->child);
  756. aead_request_set_callback(subreq, req->base.flags,
  757. req->base.complete, req->base.data);
  758. aead_request_set_crypt(subreq, req->src, req->dst,
  759. enc ? 0 : authsize, iv);
  760. aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
  761. subreq->cryptlen);
  762. return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
  763. }
  764. static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
  765. {
  766. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  767. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
  768. unsigned int authsize = crypto_aead_authsize(aead);
  769. unsigned int nbytes = req->assoclen + req->cryptlen -
  770. (enc ? 0 : authsize);
  771. SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
  772. skcipher_request_set_sync_tfm(nreq, ctx->null);
  773. skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
  774. skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
  775. return crypto_skcipher_encrypt(nreq);
  776. }
  777. static int crypto_rfc4543_encrypt(struct aead_request *req)
  778. {
  779. return crypto_ipsec_check_assoclen(req->assoclen) ?:
  780. crypto_rfc4543_crypt(req, true);
  781. }
  782. static int crypto_rfc4543_decrypt(struct aead_request *req)
  783. {
  784. return crypto_ipsec_check_assoclen(req->assoclen) ?:
  785. crypto_rfc4543_crypt(req, false);
  786. }
  787. static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
  788. {
  789. struct aead_instance *inst = aead_alg_instance(tfm);
  790. struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
  791. struct crypto_aead_spawn *spawn = &ictx->aead;
  792. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
  793. struct crypto_aead *aead;
  794. struct crypto_sync_skcipher *null;
  795. unsigned long align;
  796. int err = 0;
  797. aead = crypto_spawn_aead(spawn);
  798. if (IS_ERR(aead))
  799. return PTR_ERR(aead);
  800. null = crypto_get_default_null_skcipher();
  801. err = PTR_ERR(null);
  802. if (IS_ERR(null))
  803. goto err_free_aead;
  804. ctx->child = aead;
  805. ctx->null = null;
  806. align = crypto_aead_alignmask(aead);
  807. align &= ~(crypto_tfm_ctx_alignment() - 1);
  808. crypto_aead_set_reqsize(
  809. tfm,
  810. sizeof(struct crypto_rfc4543_req_ctx) +
  811. ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
  812. align + GCM_AES_IV_SIZE);
  813. return 0;
  814. err_free_aead:
  815. crypto_free_aead(aead);
  816. return err;
  817. }
  818. static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
  819. {
  820. struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
  821. crypto_free_aead(ctx->child);
  822. crypto_put_default_null_skcipher();
  823. }
  824. static void crypto_rfc4543_free(struct aead_instance *inst)
  825. {
  826. struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
  827. crypto_drop_aead(&ctx->aead);
  828. kfree(inst);
  829. }
  830. static int crypto_rfc4543_create(struct crypto_template *tmpl,
  831. struct rtattr **tb)
  832. {
  833. u32 mask;
  834. struct aead_instance *inst;
  835. struct aead_alg *alg;
  836. struct crypto_rfc4543_instance_ctx *ctx;
  837. int err;
  838. err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
  839. if (err)
  840. return err;
  841. inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
  842. if (!inst)
  843. return -ENOMEM;
  844. ctx = aead_instance_ctx(inst);
  845. err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst),
  846. crypto_attr_alg_name(tb[1]), 0, mask);
  847. if (err)
  848. goto err_free_inst;
  849. alg = crypto_spawn_aead_alg(&ctx->aead);
  850. err = -EINVAL;
  851. /* Underlying IV size must be 12. */
  852. if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
  853. goto err_free_inst;
  854. /* Not a stream cipher? */
  855. if (alg->base.cra_blocksize != 1)
  856. goto err_free_inst;
  857. err = -ENAMETOOLONG;
  858. if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
  859. "rfc4543(%s)", alg->base.cra_name) >=
  860. CRYPTO_MAX_ALG_NAME ||
  861. snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
  862. "rfc4543(%s)", alg->base.cra_driver_name) >=
  863. CRYPTO_MAX_ALG_NAME)
  864. goto err_free_inst;
  865. inst->alg.base.cra_priority = alg->base.cra_priority;
  866. inst->alg.base.cra_blocksize = 1;
  867. inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
  868. inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
  869. inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
  870. inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
  871. inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
  872. inst->alg.init = crypto_rfc4543_init_tfm;
  873. inst->alg.exit = crypto_rfc4543_exit_tfm;
  874. inst->alg.setkey = crypto_rfc4543_setkey;
  875. inst->alg.setauthsize = crypto_rfc4543_setauthsize;
  876. inst->alg.encrypt = crypto_rfc4543_encrypt;
  877. inst->alg.decrypt = crypto_rfc4543_decrypt;
  878. inst->free = crypto_rfc4543_free;
  879. err = aead_register_instance(tmpl, inst);
  880. if (err) {
  881. err_free_inst:
  882. crypto_rfc4543_free(inst);
  883. }
  884. return err;
  885. }
  886. static struct crypto_template crypto_gcm_tmpls[] = {
  887. {
  888. .name = "gcm_base",
  889. .create = crypto_gcm_base_create,
  890. .module = THIS_MODULE,
  891. }, {
  892. .name = "gcm",
  893. .create = crypto_gcm_create,
  894. .module = THIS_MODULE,
  895. }, {
  896. .name = "rfc4106",
  897. .create = crypto_rfc4106_create,
  898. .module = THIS_MODULE,
  899. }, {
  900. .name = "rfc4543",
  901. .create = crypto_rfc4543_create,
  902. .module = THIS_MODULE,
  903. },
  904. };
  905. static int __init crypto_gcm_module_init(void)
  906. {
  907. int err;
  908. gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
  909. if (!gcm_zeroes)
  910. return -ENOMEM;
  911. sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
  912. err = crypto_register_templates(crypto_gcm_tmpls,
  913. ARRAY_SIZE(crypto_gcm_tmpls));
  914. if (err)
  915. kfree(gcm_zeroes);
  916. return err;
  917. }
  918. static void __exit crypto_gcm_module_exit(void)
  919. {
  920. kfree(gcm_zeroes);
  921. crypto_unregister_templates(crypto_gcm_tmpls,
  922. ARRAY_SIZE(crypto_gcm_tmpls));
  923. }
  924. subsys_initcall(crypto_gcm_module_init);
  925. module_exit(crypto_gcm_module_exit);
  926. MODULE_LICENSE("GPL");
  927. MODULE_DESCRIPTION("Galois/Counter Mode");
  928. MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
  929. MODULE_ALIAS_CRYPTO("gcm_base");
  930. MODULE_ALIAS_CRYPTO("rfc4106");
  931. MODULE_ALIAS_CRYPTO("rfc4543");
  932. MODULE_ALIAS_CRYPTO("gcm");