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13#include <linux/module.h>
14#include <linux/sched.h>
15#include <linux/delay.h>
16#include <linux/scatterlist.h>
17#include <linux/crypto.h>
18#include <crypto/algapi.h>
19#include <crypto/hash.h>
20#include <crypto/internal/hash.h>
21#include <crypto/sha.h>
22#include <crypto/scatterwalk.h>
23
24#include "ccp-crypto.h"
25
26static int ccp_sha_complete(struct crypto_async_request *async_req, int ret)
27{
28 struct ahash_request *req = ahash_request_cast(async_req);
29 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
30 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
31 unsigned int digest_size = crypto_ahash_digestsize(tfm);
32
33 if (ret)
34 goto e_free;
35
36 if (rctx->hash_rem) {
37
38 unsigned int offset = rctx->nbytes - rctx->hash_rem;
39
40 scatterwalk_map_and_copy(rctx->buf, rctx->src,
41 offset, rctx->hash_rem, 0);
42 rctx->buf_count = rctx->hash_rem;
43 } else {
44 rctx->buf_count = 0;
45 }
46
47
48 if (req->result)
49 memcpy(req->result, rctx->ctx, digest_size);
50
51e_free:
52 sg_free_table(&rctx->data_sg);
53
54 return ret;
55}
56
57static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,
58 unsigned int final)
59{
60 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
61 struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
62 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
63 struct scatterlist *sg;
64 unsigned int block_size =
65 crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
66 unsigned int sg_count;
67 gfp_t gfp;
68 u64 len;
69 int ret;
70
71 len = (u64)rctx->buf_count + (u64)nbytes;
72
73 if (!final && (len <= block_size)) {
74 scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,
75 0, nbytes, 0);
76 rctx->buf_count += nbytes;
77
78 return 0;
79 }
80
81 rctx->src = req->src;
82 rctx->nbytes = nbytes;
83
84 rctx->final = final;
85 rctx->hash_rem = final ? 0 : len & (block_size - 1);
86 rctx->hash_cnt = len - rctx->hash_rem;
87 if (!final && !rctx->hash_rem) {
88
89 rctx->hash_cnt -= block_size;
90 rctx->hash_rem = block_size;
91 }
92
93
94 sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));
95
96 sg = NULL;
97 if (rctx->buf_count && nbytes) {
98
99
100
101 gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
102 GFP_KERNEL : GFP_ATOMIC;
103 sg_count = sg_nents(req->src) + 1;
104 ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);
105 if (ret)
106 return ret;
107
108 sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
109 sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);
110 if (!sg) {
111 ret = -EINVAL;
112 goto e_free;
113 }
114 sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);
115 if (!sg) {
116 ret = -EINVAL;
117 goto e_free;
118 }
119 sg_mark_end(sg);
120
121 sg = rctx->data_sg.sgl;
122 } else if (rctx->buf_count) {
123 sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);
124
125 sg = &rctx->buf_sg;
126 } else if (nbytes) {
127 sg = req->src;
128 }
129
130 rctx->msg_bits += (rctx->hash_cnt << 3);
131
132 memset(&rctx->cmd, 0, sizeof(rctx->cmd));
133 INIT_LIST_HEAD(&rctx->cmd.entry);
134 rctx->cmd.engine = CCP_ENGINE_SHA;
135 rctx->cmd.u.sha.type = rctx->type;
136 rctx->cmd.u.sha.ctx = &rctx->ctx_sg;
137 rctx->cmd.u.sha.ctx_len = sizeof(rctx->ctx);
138 rctx->cmd.u.sha.src = sg;
139 rctx->cmd.u.sha.src_len = rctx->hash_cnt;
140 rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
141 &ctx->u.sha.opad_sg : NULL;
142 rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
143 ctx->u.sha.opad_count : 0;
144 rctx->cmd.u.sha.first = rctx->first;
145 rctx->cmd.u.sha.final = rctx->final;
146 rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
147
148 rctx->first = 0;
149
150 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
151
152 return ret;
153
154e_free:
155 sg_free_table(&rctx->data_sg);
156
157 return ret;
158}
159
160static int ccp_sha_init(struct ahash_request *req)
161{
162 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
163 struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
164 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
165 struct ccp_crypto_ahash_alg *alg =
166 ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
167 unsigned int block_size =
168 crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
169
170 memset(rctx, 0, sizeof(*rctx));
171
172 rctx->type = alg->type;
173 rctx->first = 1;
174
175 if (ctx->u.sha.key_len) {
176
177 memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
178 rctx->buf_count = block_size;
179 }
180
181 return 0;
182}
183
184static int ccp_sha_update(struct ahash_request *req)
185{
186 return ccp_do_sha_update(req, req->nbytes, 0);
187}
188
189static int ccp_sha_final(struct ahash_request *req)
190{
191 return ccp_do_sha_update(req, 0, 1);
192}
193
194static int ccp_sha_finup(struct ahash_request *req)
195{
196 return ccp_do_sha_update(req, req->nbytes, 1);
197}
198
199static int ccp_sha_digest(struct ahash_request *req)
200{
201 int ret;
202
203 ret = ccp_sha_init(req);
204 if (ret)
205 return ret;
206
207 return ccp_sha_finup(req);
208}
209
210static int ccp_sha_export(struct ahash_request *req, void *out)
211{
212 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
213 struct ccp_sha_exp_ctx state;
214
215
216 memset(&state, 0, sizeof(state));
217
218 state.type = rctx->type;
219 state.msg_bits = rctx->msg_bits;
220 state.first = rctx->first;
221 memcpy(state.ctx, rctx->ctx, sizeof(state.ctx));
222 state.buf_count = rctx->buf_count;
223 memcpy(state.buf, rctx->buf, sizeof(state.buf));
224
225
226 memcpy(out, &state, sizeof(state));
227
228 return 0;
229}
230
231static int ccp_sha_import(struct ahash_request *req, const void *in)
232{
233 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
234 struct ccp_sha_exp_ctx state;
235
236
237 memcpy(&state, in, sizeof(state));
238
239 memset(rctx, 0, sizeof(*rctx));
240 rctx->type = state.type;
241 rctx->msg_bits = state.msg_bits;
242 rctx->first = state.first;
243 memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx));
244 rctx->buf_count = state.buf_count;
245 memcpy(rctx->buf, state.buf, sizeof(rctx->buf));
246
247 return 0;
248}
249
250static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,
251 unsigned int key_len)
252{
253 struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
254 struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
255
256 SHASH_DESC_ON_STACK(sdesc, shash);
257
258 unsigned int block_size = crypto_shash_blocksize(shash);
259 unsigned int digest_size = crypto_shash_digestsize(shash);
260 int i, ret;
261
262
263 ctx->u.sha.key_len = 0;
264
265
266
267
268 memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
269
270 if (key_len > block_size) {
271
272 sdesc->tfm = shash;
273 sdesc->flags = crypto_ahash_get_flags(tfm) &
274 CRYPTO_TFM_REQ_MAY_SLEEP;
275
276 ret = crypto_shash_digest(sdesc, key, key_len,
277 ctx->u.sha.key);
278 if (ret) {
279 crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
280 return -EINVAL;
281 }
282
283 key_len = digest_size;
284 } else {
285 memcpy(ctx->u.sha.key, key, key_len);
286 }
287
288 for (i = 0; i < block_size; i++) {
289 ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36;
290 ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c;
291 }
292
293 sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
294 ctx->u.sha.opad_count = block_size;
295
296 ctx->u.sha.key_len = key_len;
297
298 return 0;
299}
300
301static int ccp_sha_cra_init(struct crypto_tfm *tfm)
302{
303 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
304 struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
305
306 ctx->complete = ccp_sha_complete;
307 ctx->u.sha.key_len = 0;
308
309 crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
310
311 return 0;
312}
313
314static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
315{
316}
317
318static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
319{
320 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
321 struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
322 struct crypto_shash *hmac_tfm;
323
324 hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
325 if (IS_ERR(hmac_tfm)) {
326 pr_warn("could not load driver %s need for HMAC support\n",
327 alg->child_alg);
328 return PTR_ERR(hmac_tfm);
329 }
330
331 ctx->u.sha.hmac_tfm = hmac_tfm;
332
333 return ccp_sha_cra_init(tfm);
334}
335
336static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
337{
338 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
339
340 if (ctx->u.sha.hmac_tfm)
341 crypto_free_shash(ctx->u.sha.hmac_tfm);
342
343 ccp_sha_cra_exit(tfm);
344}
345
346struct ccp_sha_def {
347 unsigned int version;
348 const char *name;
349 const char *drv_name;
350 enum ccp_sha_type type;
351 u32 digest_size;
352 u32 block_size;
353};
354
355static struct ccp_sha_def sha_algs[] = {
356 {
357 .version = CCP_VERSION(3, 0),
358 .name = "sha1",
359 .drv_name = "sha1-ccp",
360 .type = CCP_SHA_TYPE_1,
361 .digest_size = SHA1_DIGEST_SIZE,
362 .block_size = SHA1_BLOCK_SIZE,
363 },
364 {
365 .version = CCP_VERSION(3, 0),
366 .name = "sha224",
367 .drv_name = "sha224-ccp",
368 .type = CCP_SHA_TYPE_224,
369 .digest_size = SHA224_DIGEST_SIZE,
370 .block_size = SHA224_BLOCK_SIZE,
371 },
372 {
373 .version = CCP_VERSION(3, 0),
374 .name = "sha256",
375 .drv_name = "sha256-ccp",
376 .type = CCP_SHA_TYPE_256,
377 .digest_size = SHA256_DIGEST_SIZE,
378 .block_size = SHA256_BLOCK_SIZE,
379 },
380};
381
382static int ccp_register_hmac_alg(struct list_head *head,
383 const struct ccp_sha_def *def,
384 const struct ccp_crypto_ahash_alg *base_alg)
385{
386 struct ccp_crypto_ahash_alg *ccp_alg;
387 struct ahash_alg *alg;
388 struct hash_alg_common *halg;
389 struct crypto_alg *base;
390 int ret;
391
392 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
393 if (!ccp_alg)
394 return -ENOMEM;
395
396
397 *ccp_alg = *base_alg;
398 INIT_LIST_HEAD(&ccp_alg->entry);
399
400 strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
401
402 alg = &ccp_alg->alg;
403 alg->setkey = ccp_sha_setkey;
404
405 halg = &alg->halg;
406
407 base = &halg->base;
408 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
409 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
410 def->drv_name);
411 base->cra_init = ccp_hmac_sha_cra_init;
412 base->cra_exit = ccp_hmac_sha_cra_exit;
413
414 ret = crypto_register_ahash(alg);
415 if (ret) {
416 pr_err("%s ahash algorithm registration error (%d)\n",
417 base->cra_name, ret);
418 kfree(ccp_alg);
419 return ret;
420 }
421
422 list_add(&ccp_alg->entry, head);
423
424 return ret;
425}
426
427static int ccp_register_sha_alg(struct list_head *head,
428 const struct ccp_sha_def *def)
429{
430 struct ccp_crypto_ahash_alg *ccp_alg;
431 struct ahash_alg *alg;
432 struct hash_alg_common *halg;
433 struct crypto_alg *base;
434 int ret;
435
436 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
437 if (!ccp_alg)
438 return -ENOMEM;
439
440 INIT_LIST_HEAD(&ccp_alg->entry);
441
442 ccp_alg->type = def->type;
443
444 alg = &ccp_alg->alg;
445 alg->init = ccp_sha_init;
446 alg->update = ccp_sha_update;
447 alg->final = ccp_sha_final;
448 alg->finup = ccp_sha_finup;
449 alg->digest = ccp_sha_digest;
450 alg->export = ccp_sha_export;
451 alg->import = ccp_sha_import;
452
453 halg = &alg->halg;
454 halg->digestsize = def->digest_size;
455 halg->statesize = sizeof(struct ccp_sha_exp_ctx);
456
457 base = &halg->base;
458 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
459 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
460 def->drv_name);
461 base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC |
462 CRYPTO_ALG_KERN_DRIVER_ONLY |
463 CRYPTO_ALG_NEED_FALLBACK;
464 base->cra_blocksize = def->block_size;
465 base->cra_ctxsize = sizeof(struct ccp_ctx);
466 base->cra_priority = CCP_CRA_PRIORITY;
467 base->cra_type = &crypto_ahash_type;
468 base->cra_init = ccp_sha_cra_init;
469 base->cra_exit = ccp_sha_cra_exit;
470 base->cra_module = THIS_MODULE;
471
472 ret = crypto_register_ahash(alg);
473 if (ret) {
474 pr_err("%s ahash algorithm registration error (%d)\n",
475 base->cra_name, ret);
476 kfree(ccp_alg);
477 return ret;
478 }
479
480 list_add(&ccp_alg->entry, head);
481
482 ret = ccp_register_hmac_alg(head, def, ccp_alg);
483
484 return ret;
485}
486
487int ccp_register_sha_algs(struct list_head *head)
488{
489 int i, ret;
490 unsigned int ccpversion = ccp_version();
491
492 for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
493 if (sha_algs[i].version > ccpversion)
494 continue;
495 ret = ccp_register_sha_alg(head, &sha_algs[i]);
496 if (ret)
497 return ret;
498 }
499
500 return 0;
501}
502
