1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AMD Cryptographic Coprocessor (CCP) SHA crypto API support
4 *
5 * Copyright (C) 2013,2018 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 * Author: Gary R Hook <gary.hook@amd.com>
9 */
10
11 #include <linux/module.h>
12 #include <linux/sched.h>
13 #include <linux/delay.h>
14 #include <linux/scatterlist.h>
15 #include <linux/crypto.h>
16 #include <crypto/algapi.h>
17 #include <crypto/hash.h>
18 #include <crypto/hmac.h>
19 #include <crypto/internal/hash.h>
20 #include <crypto/sha.h>
21 #include <crypto/scatterwalk.h>
22 #include <linux/string.h>
23
24 #include "ccp-crypto.h"
25
ccp_sha_complete(struct crypto_async_request * async_req,int ret)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);
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 */
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 /* Update result area if supplied */
48 if (req->result && rctx->final)
49 memcpy(req->result, rctx->ctx, digest_size);
50
51 e_free:
52 sg_free_table(&rctx->data_sg);
53
54 return ret;
55 }
56
ccp_do_sha_update(struct ahash_request * req,unsigned int nbytes,unsigned int final)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);
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 /* 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
96 sg = NULL;
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;
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); /* 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
138 switch (rctx->type) {
139 case CCP_SHA_TYPE_1:
140 rctx->cmd.u.sha.ctx_len = SHA1_DIGEST_SIZE;
141 break;
142 case CCP_SHA_TYPE_224:
143 rctx->cmd.u.sha.ctx_len = SHA224_DIGEST_SIZE;
144 break;
145 case CCP_SHA_TYPE_256:
146 rctx->cmd.u.sha.ctx_len = SHA256_DIGEST_SIZE;
147 break;
148 case CCP_SHA_TYPE_384:
149 rctx->cmd.u.sha.ctx_len = SHA384_DIGEST_SIZE;
150 break;
151 case CCP_SHA_TYPE_512:
152 rctx->cmd.u.sha.ctx_len = SHA512_DIGEST_SIZE;
153 break;
154 default:
155 /* Should never get here */
156 break;
157 }
158
159 rctx->cmd.u.sha.src = sg;
160 rctx->cmd.u.sha.src_len = rctx->hash_cnt;
161 rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?
162 &ctx->u.sha.opad_sg : NULL;
163 rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?
164 ctx->u.sha.opad_count : 0;
165 rctx->cmd.u.sha.first = rctx->first;
166 rctx->cmd.u.sha.final = rctx->final;
167 rctx->cmd.u.sha.msg_bits = rctx->msg_bits;
168
169 rctx->first = 0;
170
171 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
172
173 return ret;
174
175 e_free:
176 sg_free_table(&rctx->data_sg);
177
178 return ret;
179 }
180
ccp_sha_init(struct ahash_request * req)181 static int ccp_sha_init(struct ahash_request *req)
182 {
183 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
184 struct ccp_ctx *ctx = crypto_ahash_ctx(tfm);
185 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
186 struct ccp_crypto_ahash_alg *alg =
187 ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));
188 unsigned int block_size =
189 crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
190
191 memset(rctx, 0, sizeof(*rctx));
192
193 rctx->type = alg->type;
194 rctx->first = 1;
195
196 if (ctx->u.sha.key_len) {
197 /* Buffer the HMAC key for first update */
198 memcpy(rctx->buf, ctx->u.sha.ipad, block_size);
199 rctx->buf_count = block_size;
200 }
201
202 return 0;
203 }
204
ccp_sha_update(struct ahash_request * req)205 static int ccp_sha_update(struct ahash_request *req)
206 {
207 return ccp_do_sha_update(req, req->nbytes, 0);
208 }
209
ccp_sha_final(struct ahash_request * req)210 static int ccp_sha_final(struct ahash_request *req)
211 {
212 return ccp_do_sha_update(req, 0, 1);
213 }
214
ccp_sha_finup(struct ahash_request * req)215 static int ccp_sha_finup(struct ahash_request *req)
216 {
217 return ccp_do_sha_update(req, req->nbytes, 1);
218 }
219
ccp_sha_digest(struct ahash_request * req)220 static int ccp_sha_digest(struct ahash_request *req)
221 {
222 int ret;
223
224 ret = ccp_sha_init(req);
225 if (ret)
226 return ret;
227
228 return ccp_sha_finup(req);
229 }
230
ccp_sha_export(struct ahash_request * req,void * out)231 static int ccp_sha_export(struct ahash_request *req, void *out)
232 {
233 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
234 struct ccp_sha_exp_ctx state;
235
236 /* Don't let anything leak to 'out' */
237 memset(&state, 0, sizeof(state));
238
239 state.type = rctx->type;
240 state.msg_bits = rctx->msg_bits;
241 state.first = rctx->first;
242 memcpy(state.ctx, rctx->ctx, sizeof(state.ctx));
243 state.buf_count = rctx->buf_count;
244 memcpy(state.buf, rctx->buf, sizeof(state.buf));
245
246 /* 'out' may not be aligned so memcpy from local variable */
247 memcpy(out, &state, sizeof(state));
248
249 return 0;
250 }
251
ccp_sha_import(struct ahash_request * req,const void * in)252 static int ccp_sha_import(struct ahash_request *req, const void *in)
253 {
254 struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req);
255 struct ccp_sha_exp_ctx state;
256
257 /* 'in' may not be aligned so memcpy to local variable */
258 memcpy(&state, in, sizeof(state));
259
260 memset(rctx, 0, sizeof(*rctx));
261 rctx->type = state.type;
262 rctx->msg_bits = state.msg_bits;
263 rctx->first = state.first;
264 memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx));
265 rctx->buf_count = state.buf_count;
266 memcpy(rctx->buf, state.buf, sizeof(rctx->buf));
267
268 return 0;
269 }
270
ccp_sha_setkey(struct crypto_ahash * tfm,const u8 * key,unsigned int key_len)271 static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,
272 unsigned int key_len)
273 {
274 struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
275 struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
276 unsigned int block_size = crypto_shash_blocksize(shash);
277 unsigned int digest_size = crypto_shash_digestsize(shash);
278 int i, ret;
279
280 /* Set to zero until complete */
281 ctx->u.sha.key_len = 0;
282
283 /* Clear key area to provide zero padding for keys smaller
284 * than the block size
285 */
286 memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));
287
288 if (key_len > block_size) {
289 /* Must hash the input key */
290 ret = crypto_shash_tfm_digest(shash, key, key_len,
291 ctx->u.sha.key);
292 if (ret)
293 return -EINVAL;
294
295 key_len = digest_size;
296 } else {
297 memcpy(ctx->u.sha.key, key, key_len);
298 }
299
300 for (i = 0; i < block_size; i++) {
301 ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ HMAC_IPAD_VALUE;
302 ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ HMAC_OPAD_VALUE;
303 }
304
305 sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);
306 ctx->u.sha.opad_count = block_size;
307
308 ctx->u.sha.key_len = key_len;
309
310 return 0;
311 }
312
ccp_sha_cra_init(struct crypto_tfm * tfm)313 static int ccp_sha_cra_init(struct crypto_tfm *tfm)
314 {
315 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
316 struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
317
318 ctx->complete = ccp_sha_complete;
319 ctx->u.sha.key_len = 0;
320
321 crypto_ahash_set_reqsize(ahash, sizeof(struct ccp_sha_req_ctx));
322
323 return 0;
324 }
325
ccp_sha_cra_exit(struct crypto_tfm * tfm)326 static void ccp_sha_cra_exit(struct crypto_tfm *tfm)
327 {
328 }
329
ccp_hmac_sha_cra_init(struct crypto_tfm * tfm)330 static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)
331 {
332 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
333 struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);
334 struct crypto_shash *hmac_tfm;
335
336 hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);
337 if (IS_ERR(hmac_tfm)) {
338 pr_warn("could not load driver %s need for HMAC support\n",
339 alg->child_alg);
340 return PTR_ERR(hmac_tfm);
341 }
342
343 ctx->u.sha.hmac_tfm = hmac_tfm;
344
345 return ccp_sha_cra_init(tfm);
346 }
347
ccp_hmac_sha_cra_exit(struct crypto_tfm * tfm)348 static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)
349 {
350 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
351
352 if (ctx->u.sha.hmac_tfm)
353 crypto_free_shash(ctx->u.sha.hmac_tfm);
354
355 ccp_sha_cra_exit(tfm);
356 }
357
358 struct ccp_sha_def {
359 unsigned int version;
360 const char *name;
361 const char *drv_name;
362 enum ccp_sha_type type;
363 u32 digest_size;
364 u32 block_size;
365 };
366
367 static struct ccp_sha_def sha_algs[] = {
368 {
369 .version = CCP_VERSION(3, 0),
370 .name = "sha1",
371 .drv_name = "sha1-ccp",
372 .type = CCP_SHA_TYPE_1,
373 .digest_size = SHA1_DIGEST_SIZE,
374 .block_size = SHA1_BLOCK_SIZE,
375 },
376 {
377 .version = CCP_VERSION(3, 0),
378 .name = "sha224",
379 .drv_name = "sha224-ccp",
380 .type = CCP_SHA_TYPE_224,
381 .digest_size = SHA224_DIGEST_SIZE,
382 .block_size = SHA224_BLOCK_SIZE,
383 },
384 {
385 .version = CCP_VERSION(3, 0),
386 .name = "sha256",
387 .drv_name = "sha256-ccp",
388 .type = CCP_SHA_TYPE_256,
389 .digest_size = SHA256_DIGEST_SIZE,
390 .block_size = SHA256_BLOCK_SIZE,
391 },
392 {
393 .version = CCP_VERSION(5, 0),
394 .name = "sha384",
395 .drv_name = "sha384-ccp",
396 .type = CCP_SHA_TYPE_384,
397 .digest_size = SHA384_DIGEST_SIZE,
398 .block_size = SHA384_BLOCK_SIZE,
399 },
400 {
401 .version = CCP_VERSION(5, 0),
402 .name = "sha512",
403 .drv_name = "sha512-ccp",
404 .type = CCP_SHA_TYPE_512,
405 .digest_size = SHA512_DIGEST_SIZE,
406 .block_size = SHA512_BLOCK_SIZE,
407 },
408 };
409
ccp_register_hmac_alg(struct list_head * head,const struct ccp_sha_def * def,const struct ccp_crypto_ahash_alg * base_alg)410 static int ccp_register_hmac_alg(struct list_head *head,
411 const struct ccp_sha_def *def,
412 const struct ccp_crypto_ahash_alg *base_alg)
413 {
414 struct ccp_crypto_ahash_alg *ccp_alg;
415 struct ahash_alg *alg;
416 struct hash_alg_common *halg;
417 struct crypto_alg *base;
418 int ret;
419
420 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
421 if (!ccp_alg)
422 return -ENOMEM;
423
424 /* Copy the base algorithm and only change what's necessary */
425 *ccp_alg = *base_alg;
426 INIT_LIST_HEAD(&ccp_alg->entry);
427
428 strscpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);
429
430 alg = &ccp_alg->alg;
431 alg->setkey = ccp_sha_setkey;
432
433 halg = &alg->halg;
434
435 base = &halg->base;
436 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);
437 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",
438 def->drv_name);
439 base->cra_init = ccp_hmac_sha_cra_init;
440 base->cra_exit = ccp_hmac_sha_cra_exit;
441
442 ret = crypto_register_ahash(alg);
443 if (ret) {
444 pr_err("%s ahash algorithm registration error (%d)\n",
445 base->cra_name, ret);
446 kfree(ccp_alg);
447 return ret;
448 }
449
450 list_add(&ccp_alg->entry, head);
451
452 return ret;
453 }
454
ccp_register_sha_alg(struct list_head * head,const struct ccp_sha_def * def)455 static int ccp_register_sha_alg(struct list_head *head,
456 const struct ccp_sha_def *def)
457 {
458 struct ccp_crypto_ahash_alg *ccp_alg;
459 struct ahash_alg *alg;
460 struct hash_alg_common *halg;
461 struct crypto_alg *base;
462 int ret;
463
464 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
465 if (!ccp_alg)
466 return -ENOMEM;
467
468 INIT_LIST_HEAD(&ccp_alg->entry);
469
470 ccp_alg->type = def->type;
471
472 alg = &ccp_alg->alg;
473 alg->init = ccp_sha_init;
474 alg->update = ccp_sha_update;
475 alg->final = ccp_sha_final;
476 alg->finup = ccp_sha_finup;
477 alg->digest = ccp_sha_digest;
478 alg->export = ccp_sha_export;
479 alg->import = ccp_sha_import;
480
481 halg = &alg->halg;
482 halg->digestsize = def->digest_size;
483 halg->statesize = sizeof(struct ccp_sha_exp_ctx);
484
485 base = &halg->base;
486 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
487 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
488 def->drv_name);
489 base->cra_flags = CRYPTO_ALG_ASYNC |
490 CRYPTO_ALG_ALLOCATES_MEMORY |
491 CRYPTO_ALG_KERN_DRIVER_ONLY |
492 CRYPTO_ALG_NEED_FALLBACK;
493 base->cra_blocksize = def->block_size;
494 base->cra_ctxsize = sizeof(struct ccp_ctx);
495 base->cra_priority = CCP_CRA_PRIORITY;
496 base->cra_init = ccp_sha_cra_init;
497 base->cra_exit = ccp_sha_cra_exit;
498 base->cra_module = THIS_MODULE;
499
500 ret = crypto_register_ahash(alg);
501 if (ret) {
502 pr_err("%s ahash algorithm registration error (%d)\n",
503 base->cra_name, ret);
504 kfree(ccp_alg);
505 return ret;
506 }
507
508 list_add(&ccp_alg->entry, head);
509
510 ret = ccp_register_hmac_alg(head, def, ccp_alg);
511
512 return ret;
513 }
514
ccp_register_sha_algs(struct list_head * head)515 int ccp_register_sha_algs(struct list_head *head)
516 {
517 int i, ret;
518 unsigned int ccpversion = ccp_version();
519
520 for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
521 if (sha_algs[i].version > ccpversion)
522 continue;
523 ret = ccp_register_sha_alg(head, &sha_algs[i]);
524 if (ret)
525 return ret;
526 }
527
528 return 0;
529 }
530