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Commit | Line | Data |
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0ab0a1d5 TL |
1 | /* |
2 | * AMD Cryptographic Coprocessor (CCP) SHA crypto API support | |
3 | * | |
4 | * Copyright (C) 2013 Advanced Micro Devices, Inc. | |
5 | * | |
6 | * Author: Tom Lendacky <thomas.lendacky@amd.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
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 | ||
0ab0a1d5 TL |
26 | static 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); | |
0ab0a1d5 TL |
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 | /* Save remaining data to buffer */ | |
81a59f00 | 38 | unsigned int offset = rctx->nbytes - rctx->hash_rem; |
8db88467 | 39 | |
81a59f00 TL |
40 | scatterwalk_map_and_copy(rctx->buf, rctx->src, |
41 | offset, rctx->hash_rem, 0); | |
0ab0a1d5 | 42 | rctx->buf_count = rctx->hash_rem; |
8db88467 | 43 | } else { |
0ab0a1d5 | 44 | rctx->buf_count = 0; |
8db88467 | 45 | } |
0ab0a1d5 | 46 | |
393897c5 TL |
47 | /* Update result area if supplied */ |
48 | if (req->result) | |
49 | memcpy(req->result, rctx->ctx, digest_size); | |
0ab0a1d5 | 50 | |
0ab0a1d5 TL |
51 | e_free: |
52 | sg_free_table(&rctx->data_sg); | |
53 | ||
54 | return ret; | |
55 | } | |
56 | ||
57 | static 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); | |
c11baa02 | 61 | struct ccp_ctx *ctx = crypto_ahash_ctx(tfm); |
0ab0a1d5 TL |
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)); | |
81a59f00 | 66 | unsigned int sg_count; |
5258de8a | 67 | gfp_t gfp; |
81a59f00 | 68 | u64 len; |
0ab0a1d5 TL |
69 | int ret; |
70 | ||
81a59f00 TL |
71 | len = (u64)rctx->buf_count + (u64)nbytes; |
72 | ||
73 | if (!final && (len <= block_size)) { | |
0ab0a1d5 TL |
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 | ||
81a59f00 TL |
81 | rctx->src = req->src; |
82 | rctx->nbytes = nbytes; | |
0ab0a1d5 TL |
83 | |
84 | rctx->final = final; | |
81a59f00 TL |
85 | rctx->hash_rem = final ? 0 : len & (block_size - 1); |
86 | rctx->hash_cnt = len - rctx->hash_rem; | |
87 | if (!final && !rctx->hash_rem) { | |
0ab0a1d5 TL |
88 | /* CCP can't do zero length final, so keep some data around */ |
89 | rctx->hash_cnt -= block_size; | |
90 | rctx->hash_rem = block_size; | |
91 | } | |
92 | ||
93 | /* Initialize the context scatterlist */ | |
94 | sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx)); | |
95 | ||
0ab0a1d5 | 96 | sg = NULL; |
77dc4a51 TL |
97 | if (rctx->buf_count && nbytes) { |
98 | /* Build the data scatterlist table - allocate enough entries | |
99 | * for both data pieces (buffer and input data) | |
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; | |
0ab0a1d5 | 107 | |
0ab0a1d5 TL |
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); | |
355eba5d TL |
110 | if (!sg) { |
111 | ret = -EINVAL; | |
112 | goto e_free; | |
113 | } | |
0ab0a1d5 | 114 | sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src); |
355eba5d TL |
115 | if (!sg) { |
116 | ret = -EINVAL; | |
117 | goto e_free; | |
118 | } | |
0ab0a1d5 TL |
119 | sg_mark_end(sg); |
120 | ||
77dc4a51 TL |
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 | ||
0ab0a1d5 TL |
130 | rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */ |
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); | |
77dc4a51 | 138 | rctx->cmd.u.sha.src = sg; |
0ab0a1d5 | 139 | rctx->cmd.u.sha.src_len = rctx->hash_cnt; |
c11baa02 TL |
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; | |
0ab0a1d5 TL |
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 | ||
355eba5d TL |
152 | return ret; |
153 | ||
154 | e_free: | |
155 | sg_free_table(&rctx->data_sg); | |
156 | ||
0ab0a1d5 TL |
157 | return ret; |
158 | } | |
159 | ||
160 | static int ccp_sha_init(struct ahash_request *req) | |
161 | { | |
162 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
77dc4a51 | 163 | struct ccp_ctx *ctx = crypto_ahash_ctx(tfm); |
0ab0a1d5 TL |
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)); | |
77dc4a51 TL |
167 | unsigned int block_size = |
168 | crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); | |
0ab0a1d5 TL |
169 | |
170 | memset(rctx, 0, sizeof(*rctx)); | |
171 | ||
0ab0a1d5 TL |
172 | rctx->type = alg->type; |
173 | rctx->first = 1; | |
174 | ||
77dc4a51 TL |
175 | if (ctx->u.sha.key_len) { |
176 | /* Buffer the HMAC key for first update */ | |
177 | memcpy(rctx->buf, ctx->u.sha.ipad, block_size); | |
178 | rctx->buf_count = block_size; | |
179 | } | |
180 | ||
0ab0a1d5 TL |
181 | return 0; |
182 | } | |
183 | ||
184 | static int ccp_sha_update(struct ahash_request *req) | |
185 | { | |
186 | return ccp_do_sha_update(req, req->nbytes, 0); | |
187 | } | |
188 | ||
189 | static int ccp_sha_final(struct ahash_request *req) | |
190 | { | |
191 | return ccp_do_sha_update(req, 0, 1); | |
192 | } | |
193 | ||
194 | static int ccp_sha_finup(struct ahash_request *req) | |
195 | { | |
196 | return ccp_do_sha_update(req, req->nbytes, 1); | |
197 | } | |
198 | ||
199 | static int ccp_sha_digest(struct ahash_request *req) | |
200 | { | |
82d1585b | 201 | int ret; |
0ab0a1d5 | 202 | |
82d1585b TL |
203 | ret = ccp_sha_init(req); |
204 | if (ret) | |
205 | return ret; | |
206 | ||
207 | return ccp_sha_finup(req); | |
0ab0a1d5 TL |
208 | } |
209 | ||
952bce97 TL |
210 | static int ccp_sha_export(struct ahash_request *req, void *out) |
211 | { | |
212 | struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req); | |
b31dde2a | 213 | struct ccp_sha_exp_ctx state; |
952bce97 | 214 | |
b31dde2a TL |
215 | state.type = rctx->type; |
216 | state.msg_bits = rctx->msg_bits; | |
217 | state.first = rctx->first; | |
218 | memcpy(state.ctx, rctx->ctx, sizeof(state.ctx)); | |
219 | state.buf_count = rctx->buf_count; | |
220 | memcpy(state.buf, rctx->buf, sizeof(state.buf)); | |
221 | ||
222 | /* 'out' may not be aligned so memcpy from local variable */ | |
223 | memcpy(out, &state, sizeof(state)); | |
952bce97 TL |
224 | |
225 | return 0; | |
226 | } | |
227 | ||
228 | static int ccp_sha_import(struct ahash_request *req, const void *in) | |
229 | { | |
230 | struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req); | |
b31dde2a TL |
231 | struct ccp_sha_exp_ctx state; |
232 | ||
233 | /* 'in' may not be aligned so memcpy to local variable */ | |
234 | memcpy(&state, in, sizeof(state)); | |
235 | ||
236 | rctx->type = state.type; | |
237 | rctx->msg_bits = state.msg_bits; | |
238 | rctx->first = state.first; | |
239 | memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx)); | |
240 | rctx->buf_count = state.buf_count; | |
241 | memcpy(rctx->buf, state.buf, sizeof(rctx->buf)); | |
952bce97 TL |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
0ab0a1d5 TL |
246 | static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key, |
247 | unsigned int key_len) | |
248 | { | |
249 | struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm)); | |
c11baa02 | 250 | struct crypto_shash *shash = ctx->u.sha.hmac_tfm; |
61ded524 JSM |
251 | |
252 | SHASH_DESC_ON_STACK(sdesc, shash); | |
253 | ||
c11baa02 TL |
254 | unsigned int block_size = crypto_shash_blocksize(shash); |
255 | unsigned int digest_size = crypto_shash_digestsize(shash); | |
0ab0a1d5 TL |
256 | int i, ret; |
257 | ||
258 | /* Set to zero until complete */ | |
259 | ctx->u.sha.key_len = 0; | |
260 | ||
261 | /* Clear key area to provide zero padding for keys smaller | |
262 | * than the block size | |
263 | */ | |
264 | memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key)); | |
265 | ||
266 | if (key_len > block_size) { | |
267 | /* Must hash the input key */ | |
61ded524 JSM |
268 | sdesc->tfm = shash; |
269 | sdesc->flags = crypto_ahash_get_flags(tfm) & | |
c11baa02 TL |
270 | CRYPTO_TFM_REQ_MAY_SLEEP; |
271 | ||
61ded524 | 272 | ret = crypto_shash_digest(sdesc, key, key_len, |
c11baa02 | 273 | ctx->u.sha.key); |
0ab0a1d5 TL |
274 | if (ret) { |
275 | crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | key_len = digest_size; | |
8db88467 | 280 | } else { |
0ab0a1d5 | 281 | memcpy(ctx->u.sha.key, key, key_len); |
8db88467 | 282 | } |
0ab0a1d5 TL |
283 | |
284 | for (i = 0; i < block_size; i++) { | |
285 | ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ 0x36; | |
286 | ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ 0x5c; | |
287 | } | |
288 | ||
c11baa02 TL |
289 | sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size); |
290 | ctx->u.sha.opad_count = block_size; | |
291 | ||
0ab0a1d5 TL |
292 | ctx->u.sha.key_len = key_len; |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static int ccp_sha_cra_init(struct crypto_tfm *tfm) | |
298 | { | |
299 | struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); | |
300 | struct crypto_ahash *ahash = __crypto_ahash_cast(tfm); | |
301 | ||
302 | ctx->complete = ccp_sha_complete; | |
303 | ctx->u.sha.key_len = 0; | |
304 | ||
305 | crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx)); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static void ccp_sha_cra_exit(struct crypto_tfm *tfm) | |
311 | { | |
312 | } | |
313 | ||
314 | static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm) | |
315 | { | |
316 | struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); | |
317 | struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm); | |
c11baa02 | 318 | struct crypto_shash *hmac_tfm; |
0ab0a1d5 | 319 | |
c11baa02 | 320 | hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0); |
0ab0a1d5 TL |
321 | if (IS_ERR(hmac_tfm)) { |
322 | pr_warn("could not load driver %s need for HMAC support\n", | |
323 | alg->child_alg); | |
324 | return PTR_ERR(hmac_tfm); | |
325 | } | |
326 | ||
327 | ctx->u.sha.hmac_tfm = hmac_tfm; | |
328 | ||
329 | return ccp_sha_cra_init(tfm); | |
330 | } | |
331 | ||
332 | static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm) | |
333 | { | |
334 | struct ccp_ctx *ctx = crypto_tfm_ctx(tfm); | |
335 | ||
336 | if (ctx->u.sha.hmac_tfm) | |
c11baa02 | 337 | crypto_free_shash(ctx->u.sha.hmac_tfm); |
0ab0a1d5 TL |
338 | |
339 | ccp_sha_cra_exit(tfm); | |
340 | } | |
341 | ||
0ab0a1d5 TL |
342 | struct ccp_sha_def { |
343 | const char *name; | |
344 | const char *drv_name; | |
0ab0a1d5 TL |
345 | enum ccp_sha_type type; |
346 | u32 digest_size; | |
347 | u32 block_size; | |
348 | }; | |
349 | ||
350 | static struct ccp_sha_def sha_algs[] = { | |
351 | { | |
352 | .name = "sha1", | |
353 | .drv_name = "sha1-ccp", | |
0ab0a1d5 TL |
354 | .type = CCP_SHA_TYPE_1, |
355 | .digest_size = SHA1_DIGEST_SIZE, | |
356 | .block_size = SHA1_BLOCK_SIZE, | |
357 | }, | |
358 | { | |
359 | .name = "sha224", | |
360 | .drv_name = "sha224-ccp", | |
0ab0a1d5 TL |
361 | .type = CCP_SHA_TYPE_224, |
362 | .digest_size = SHA224_DIGEST_SIZE, | |
363 | .block_size = SHA224_BLOCK_SIZE, | |
364 | }, | |
365 | { | |
366 | .name = "sha256", | |
367 | .drv_name = "sha256-ccp", | |
0ab0a1d5 TL |
368 | .type = CCP_SHA_TYPE_256, |
369 | .digest_size = SHA256_DIGEST_SIZE, | |
370 | .block_size = SHA256_BLOCK_SIZE, | |
371 | }, | |
372 | }; | |
373 | ||
374 | static int ccp_register_hmac_alg(struct list_head *head, | |
375 | const struct ccp_sha_def *def, | |
376 | const struct ccp_crypto_ahash_alg *base_alg) | |
377 | { | |
378 | struct ccp_crypto_ahash_alg *ccp_alg; | |
379 | struct ahash_alg *alg; | |
380 | struct hash_alg_common *halg; | |
381 | struct crypto_alg *base; | |
382 | int ret; | |
383 | ||
384 | ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); | |
385 | if (!ccp_alg) | |
386 | return -ENOMEM; | |
387 | ||
388 | /* Copy the base algorithm and only change what's necessary */ | |
d1dd206c | 389 | *ccp_alg = *base_alg; |
0ab0a1d5 TL |
390 | INIT_LIST_HEAD(&ccp_alg->entry); |
391 | ||
392 | strncpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME); | |
393 | ||
394 | alg = &ccp_alg->alg; | |
395 | alg->setkey = ccp_sha_setkey; | |
396 | ||
397 | halg = &alg->halg; | |
398 | ||
399 | base = &halg->base; | |
400 | snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name); | |
401 | snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s", | |
402 | def->drv_name); | |
403 | base->cra_init = ccp_hmac_sha_cra_init; | |
404 | base->cra_exit = ccp_hmac_sha_cra_exit; | |
405 | ||
406 | ret = crypto_register_ahash(alg); | |
407 | if (ret) { | |
408 | pr_err("%s ahash algorithm registration error (%d)\n", | |
8db88467 | 409 | base->cra_name, ret); |
0ab0a1d5 TL |
410 | kfree(ccp_alg); |
411 | return ret; | |
412 | } | |
413 | ||
414 | list_add(&ccp_alg->entry, head); | |
415 | ||
416 | return ret; | |
417 | } | |
418 | ||
419 | static int ccp_register_sha_alg(struct list_head *head, | |
420 | const struct ccp_sha_def *def) | |
421 | { | |
422 | struct ccp_crypto_ahash_alg *ccp_alg; | |
423 | struct ahash_alg *alg; | |
424 | struct hash_alg_common *halg; | |
425 | struct crypto_alg *base; | |
426 | int ret; | |
427 | ||
428 | ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); | |
429 | if (!ccp_alg) | |
430 | return -ENOMEM; | |
431 | ||
432 | INIT_LIST_HEAD(&ccp_alg->entry); | |
433 | ||
0ab0a1d5 TL |
434 | ccp_alg->type = def->type; |
435 | ||
436 | alg = &ccp_alg->alg; | |
437 | alg->init = ccp_sha_init; | |
438 | alg->update = ccp_sha_update; | |
439 | alg->final = ccp_sha_final; | |
440 | alg->finup = ccp_sha_finup; | |
441 | alg->digest = ccp_sha_digest; | |
952bce97 TL |
442 | alg->export = ccp_sha_export; |
443 | alg->import = ccp_sha_import; | |
0ab0a1d5 TL |
444 | |
445 | halg = &alg->halg; | |
446 | halg->digestsize = def->digest_size; | |
d1662165 | 447 | halg->statesize = sizeof(struct ccp_sha_exp_ctx); |
0ab0a1d5 TL |
448 | |
449 | base = &halg->base; | |
450 | snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); | |
451 | snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
452 | def->drv_name); | |
453 | base->cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC | | |
454 | CRYPTO_ALG_KERN_DRIVER_ONLY | | |
455 | CRYPTO_ALG_NEED_FALLBACK; | |
456 | base->cra_blocksize = def->block_size; | |
457 | base->cra_ctxsize = sizeof(struct ccp_ctx); | |
458 | base->cra_priority = CCP_CRA_PRIORITY; | |
459 | base->cra_type = &crypto_ahash_type; | |
460 | base->cra_init = ccp_sha_cra_init; | |
461 | base->cra_exit = ccp_sha_cra_exit; | |
462 | base->cra_module = THIS_MODULE; | |
463 | ||
464 | ret = crypto_register_ahash(alg); | |
465 | if (ret) { | |
466 | pr_err("%s ahash algorithm registration error (%d)\n", | |
8db88467 | 467 | base->cra_name, ret); |
0ab0a1d5 TL |
468 | kfree(ccp_alg); |
469 | return ret; | |
470 | } | |
471 | ||
472 | list_add(&ccp_alg->entry, head); | |
473 | ||
474 | ret = ccp_register_hmac_alg(head, def, ccp_alg); | |
475 | ||
476 | return ret; | |
477 | } | |
478 | ||
479 | int ccp_register_sha_algs(struct list_head *head) | |
480 | { | |
481 | int i, ret; | |
482 | ||
483 | for (i = 0; i < ARRAY_SIZE(sha_algs); i++) { | |
484 | ret = ccp_register_sha_alg(head, &sha_algs[i]); | |
485 | if (ret) | |
486 | return ret; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } |