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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AMD Cryptographic Coprocessor (CCP) SHA crypto API support4 *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/sha1.h>21#include <crypto/sha2.h>22#include <crypto/scatterwalk.h>23#include <linux/string.h>24 25#include "ccp-crypto.h"26 27static int ccp_sha_complete(struct crypto_async_request *async_req, int ret)28{29 struct ahash_request *req = ahash_request_cast(async_req);30 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);31 struct ccp_sha_req_ctx *rctx = ahash_request_ctx_dma(req);32 unsigned int digest_size = crypto_ahash_digestsize(tfm);33 34 if (ret)35 goto e_free;36 37 if (rctx->hash_rem) {38 /* Save remaining data to buffer */39 unsigned int offset = rctx->nbytes - rctx->hash_rem;40 41 scatterwalk_map_and_copy(rctx->buf, rctx->src,42 offset, rctx->hash_rem, 0);43 rctx->buf_count = rctx->hash_rem;44 } else {45 rctx->buf_count = 0;46 }47 48 /* Update result area if supplied */49 if (req->result && rctx->final)50 memcpy(req->result, rctx->ctx, digest_size);51 52e_free:53 sg_free_table(&rctx->data_sg);54 55 return ret;56}57 58static int ccp_do_sha_update(struct ahash_request *req, unsigned int nbytes,59 unsigned int final)60{61 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);62 struct ccp_ctx *ctx = crypto_ahash_ctx_dma(tfm);63 struct ccp_sha_req_ctx *rctx = ahash_request_ctx_dma(req);64 struct scatterlist *sg;65 unsigned int block_size =66 crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));67 unsigned int sg_count;68 gfp_t gfp;69 u64 len;70 int ret;71 72 len = (u64)rctx->buf_count + (u64)nbytes;73 74 if (!final && (len <= block_size)) {75 scatterwalk_map_and_copy(rctx->buf + rctx->buf_count, req->src,76 0, nbytes, 0);77 rctx->buf_count += nbytes;78 79 return 0;80 }81 82 rctx->src = req->src;83 rctx->nbytes = nbytes;84 85 rctx->final = final;86 rctx->hash_rem = final ? 0 : len & (block_size - 1);87 rctx->hash_cnt = len - rctx->hash_rem;88 if (!final && !rctx->hash_rem) {89 /* CCP can't do zero length final, so keep some data around */90 rctx->hash_cnt -= block_size;91 rctx->hash_rem = block_size;92 }93 94 /* Initialize the context scatterlist */95 sg_init_one(&rctx->ctx_sg, rctx->ctx, sizeof(rctx->ctx));96 97 sg = NULL;98 if (rctx->buf_count && nbytes) {99 /* Build the data scatterlist table - allocate enough entries100 * for both data pieces (buffer and input data)101 */102 gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?103 GFP_KERNEL : GFP_ATOMIC;104 sg_count = sg_nents(req->src) + 1;105 ret = sg_alloc_table(&rctx->data_sg, sg_count, gfp);106 if (ret)107 return ret;108 109 sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);110 sg = ccp_crypto_sg_table_add(&rctx->data_sg, &rctx->buf_sg);111 if (!sg) {112 ret = -EINVAL;113 goto e_free;114 }115 sg = ccp_crypto_sg_table_add(&rctx->data_sg, req->src);116 if (!sg) {117 ret = -EINVAL;118 goto e_free;119 }120 sg_mark_end(sg);121 122 sg = rctx->data_sg.sgl;123 } else if (rctx->buf_count) {124 sg_init_one(&rctx->buf_sg, rctx->buf, rctx->buf_count);125 126 sg = &rctx->buf_sg;127 } else if (nbytes) {128 sg = req->src;129 }130 131 rctx->msg_bits += (rctx->hash_cnt << 3); /* Total in bits */132 133 memset(&rctx->cmd, 0, sizeof(rctx->cmd));134 INIT_LIST_HEAD(&rctx->cmd.entry);135 rctx->cmd.engine = CCP_ENGINE_SHA;136 rctx->cmd.u.sha.type = rctx->type;137 rctx->cmd.u.sha.ctx = &rctx->ctx_sg;138 139 switch (rctx->type) {140 case CCP_SHA_TYPE_1:141 rctx->cmd.u.sha.ctx_len = SHA1_DIGEST_SIZE;142 break;143 case CCP_SHA_TYPE_224:144 rctx->cmd.u.sha.ctx_len = SHA224_DIGEST_SIZE;145 break;146 case CCP_SHA_TYPE_256:147 rctx->cmd.u.sha.ctx_len = SHA256_DIGEST_SIZE;148 break;149 case CCP_SHA_TYPE_384:150 rctx->cmd.u.sha.ctx_len = SHA384_DIGEST_SIZE;151 break;152 case CCP_SHA_TYPE_512:153 rctx->cmd.u.sha.ctx_len = SHA512_DIGEST_SIZE;154 break;155 default:156 /* Should never get here */157 break;158 }159 160 rctx->cmd.u.sha.src = sg;161 rctx->cmd.u.sha.src_len = rctx->hash_cnt;162 rctx->cmd.u.sha.opad = ctx->u.sha.key_len ?163 &ctx->u.sha.opad_sg : NULL;164 rctx->cmd.u.sha.opad_len = ctx->u.sha.key_len ?165 ctx->u.sha.opad_count : 0;166 rctx->cmd.u.sha.first = rctx->first;167 rctx->cmd.u.sha.final = rctx->final;168 rctx->cmd.u.sha.msg_bits = rctx->msg_bits;169 170 rctx->first = 0;171 172 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);173 174 return ret;175 176e_free:177 sg_free_table(&rctx->data_sg);178 179 return ret;180}181 182static int ccp_sha_init(struct ahash_request *req)183{184 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);185 struct ccp_ctx *ctx = crypto_ahash_ctx_dma(tfm);186 struct ccp_sha_req_ctx *rctx = ahash_request_ctx_dma(req);187 struct ccp_crypto_ahash_alg *alg =188 ccp_crypto_ahash_alg(crypto_ahash_tfm(tfm));189 unsigned int block_size =190 crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));191 192 memset(rctx, 0, sizeof(*rctx));193 194 rctx->type = alg->type;195 rctx->first = 1;196 197 if (ctx->u.sha.key_len) {198 /* Buffer the HMAC key for first update */199 memcpy(rctx->buf, ctx->u.sha.ipad, block_size);200 rctx->buf_count = block_size;201 }202 203 return 0;204}205 206static int ccp_sha_update(struct ahash_request *req)207{208 return ccp_do_sha_update(req, req->nbytes, 0);209}210 211static int ccp_sha_final(struct ahash_request *req)212{213 return ccp_do_sha_update(req, 0, 1);214}215 216static int ccp_sha_finup(struct ahash_request *req)217{218 return ccp_do_sha_update(req, req->nbytes, 1);219}220 221static int ccp_sha_digest(struct ahash_request *req)222{223 int ret;224 225 ret = ccp_sha_init(req);226 if (ret)227 return ret;228 229 return ccp_sha_finup(req);230}231 232static int ccp_sha_export(struct ahash_request *req, void *out)233{234 struct ccp_sha_req_ctx *rctx = ahash_request_ctx_dma(req);235 struct ccp_sha_exp_ctx state;236 237 /* Don't let anything leak to 'out' */238 memset(&state, 0, sizeof(state));239 240 state.type = rctx->type;241 state.msg_bits = rctx->msg_bits;242 state.first = rctx->first;243 memcpy(state.ctx, rctx->ctx, sizeof(state.ctx));244 state.buf_count = rctx->buf_count;245 memcpy(state.buf, rctx->buf, sizeof(state.buf));246 247 /* 'out' may not be aligned so memcpy from local variable */248 memcpy(out, &state, sizeof(state));249 250 return 0;251}252 253static int ccp_sha_import(struct ahash_request *req, const void *in)254{255 struct ccp_sha_req_ctx *rctx = ahash_request_ctx_dma(req);256 struct ccp_sha_exp_ctx state;257 258 /* 'in' may not be aligned so memcpy to local variable */259 memcpy(&state, in, sizeof(state));260 261 memset(rctx, 0, sizeof(*rctx));262 rctx->type = state.type;263 rctx->msg_bits = state.msg_bits;264 rctx->first = state.first;265 memcpy(rctx->ctx, state.ctx, sizeof(rctx->ctx));266 rctx->buf_count = state.buf_count;267 memcpy(rctx->buf, state.buf, sizeof(rctx->buf));268 269 return 0;270}271 272static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,273 unsigned int key_len)274{275 struct ccp_ctx *ctx = crypto_ahash_ctx_dma(tfm);276 struct crypto_shash *shash = ctx->u.sha.hmac_tfm;277 unsigned int block_size = crypto_shash_blocksize(shash);278 unsigned int digest_size = crypto_shash_digestsize(shash);279 int i, ret;280 281 /* Set to zero until complete */282 ctx->u.sha.key_len = 0;283 284 /* Clear key area to provide zero padding for keys smaller285 * than the block size286 */287 memset(ctx->u.sha.key, 0, sizeof(ctx->u.sha.key));288 289 if (key_len > block_size) {290 /* Must hash the input key */291 ret = crypto_shash_tfm_digest(shash, key, key_len,292 ctx->u.sha.key);293 if (ret)294 return -EINVAL;295 296 key_len = digest_size;297 } else {298 memcpy(ctx->u.sha.key, key, key_len);299 }300 301 for (i = 0; i < block_size; i++) {302 ctx->u.sha.ipad[i] = ctx->u.sha.key[i] ^ HMAC_IPAD_VALUE;303 ctx->u.sha.opad[i] = ctx->u.sha.key[i] ^ HMAC_OPAD_VALUE;304 }305 306 sg_init_one(&ctx->u.sha.opad_sg, ctx->u.sha.opad, block_size);307 ctx->u.sha.opad_count = block_size;308 309 ctx->u.sha.key_len = key_len;310 311 return 0;312}313 314static int ccp_sha_cra_init(struct crypto_tfm *tfm)315{316 struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);317 struct ccp_ctx *ctx = crypto_ahash_ctx_dma(ahash);318 319 ctx->complete = ccp_sha_complete;320 ctx->u.sha.key_len = 0;321 322 crypto_ahash_set_reqsize_dma(ahash, sizeof(struct ccp_sha_req_ctx));323 324 return 0;325}326 327static void ccp_sha_cra_exit(struct crypto_tfm *tfm)328{329}330 331static int ccp_hmac_sha_cra_init(struct crypto_tfm *tfm)332{333 struct ccp_ctx *ctx = crypto_tfm_ctx_dma(tfm);334 struct ccp_crypto_ahash_alg *alg = ccp_crypto_ahash_alg(tfm);335 struct crypto_shash *hmac_tfm;336 337 hmac_tfm = crypto_alloc_shash(alg->child_alg, 0, 0);338 if (IS_ERR(hmac_tfm)) {339 pr_warn("could not load driver %s need for HMAC support\n",340 alg->child_alg);341 return PTR_ERR(hmac_tfm);342 }343 344 ctx->u.sha.hmac_tfm = hmac_tfm;345 346 return ccp_sha_cra_init(tfm);347}348 349static void ccp_hmac_sha_cra_exit(struct crypto_tfm *tfm)350{351 struct ccp_ctx *ctx = crypto_tfm_ctx_dma(tfm);352 353 if (ctx->u.sha.hmac_tfm)354 crypto_free_shash(ctx->u.sha.hmac_tfm);355 356 ccp_sha_cra_exit(tfm);357}358 359struct ccp_sha_def {360 unsigned int version;361 const char *name;362 const char *drv_name;363 enum ccp_sha_type type;364 u32 digest_size;365 u32 block_size;366};367 368static struct ccp_sha_def sha_algs[] = {369 {370 .version = CCP_VERSION(3, 0),371 .name = "sha1",372 .drv_name = "sha1-ccp",373 .type = CCP_SHA_TYPE_1,374 .digest_size = SHA1_DIGEST_SIZE,375 .block_size = SHA1_BLOCK_SIZE,376 },377 {378 .version = CCP_VERSION(3, 0),379 .name = "sha224",380 .drv_name = "sha224-ccp",381 .type = CCP_SHA_TYPE_224,382 .digest_size = SHA224_DIGEST_SIZE,383 .block_size = SHA224_BLOCK_SIZE,384 },385 {386 .version = CCP_VERSION(3, 0),387 .name = "sha256",388 .drv_name = "sha256-ccp",389 .type = CCP_SHA_TYPE_256,390 .digest_size = SHA256_DIGEST_SIZE,391 .block_size = SHA256_BLOCK_SIZE,392 },393 {394 .version = CCP_VERSION(5, 0),395 .name = "sha384",396 .drv_name = "sha384-ccp",397 .type = CCP_SHA_TYPE_384,398 .digest_size = SHA384_DIGEST_SIZE,399 .block_size = SHA384_BLOCK_SIZE,400 },401 {402 .version = CCP_VERSION(5, 0),403 .name = "sha512",404 .drv_name = "sha512-ccp",405 .type = CCP_SHA_TYPE_512,406 .digest_size = SHA512_DIGEST_SIZE,407 .block_size = SHA512_BLOCK_SIZE,408 },409};410 411static int ccp_register_hmac_alg(struct list_head *head,412 const struct ccp_sha_def *def,413 const struct ccp_crypto_ahash_alg *base_alg)414{415 struct ccp_crypto_ahash_alg *ccp_alg;416 struct ahash_alg *alg;417 struct hash_alg_common *halg;418 struct crypto_alg *base;419 int ret;420 421 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);422 if (!ccp_alg)423 return -ENOMEM;424 425 /* Copy the base algorithm and only change what's necessary */426 *ccp_alg = *base_alg;427 INIT_LIST_HEAD(&ccp_alg->entry);428 429 strscpy(ccp_alg->child_alg, def->name, CRYPTO_MAX_ALG_NAME);430 431 alg = &ccp_alg->alg;432 alg->setkey = ccp_sha_setkey;433 434 halg = &alg->halg;435 436 base = &halg->base;437 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", def->name);438 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s",439 def->drv_name);440 base->cra_init = ccp_hmac_sha_cra_init;441 base->cra_exit = ccp_hmac_sha_cra_exit;442 443 ret = crypto_register_ahash(alg);444 if (ret) {445 pr_err("%s ahash algorithm registration error (%d)\n",446 base->cra_name, ret);447 kfree(ccp_alg);448 return ret;449 }450 451 list_add(&ccp_alg->entry, head);452 453 return ret;454}455 456static int ccp_register_sha_alg(struct list_head *head,457 const struct ccp_sha_def *def)458{459 struct ccp_crypto_ahash_alg *ccp_alg;460 struct ahash_alg *alg;461 struct hash_alg_common *halg;462 struct crypto_alg *base;463 int ret;464 465 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);466 if (!ccp_alg)467 return -ENOMEM;468 469 INIT_LIST_HEAD(&ccp_alg->entry);470 471 ccp_alg->type = def->type;472 473 alg = &ccp_alg->alg;474 alg->init = ccp_sha_init;475 alg->update = ccp_sha_update;476 alg->final = ccp_sha_final;477 alg->finup = ccp_sha_finup;478 alg->digest = ccp_sha_digest;479 alg->export = ccp_sha_export;480 alg->import = ccp_sha_import;481 482 halg = &alg->halg;483 halg->digestsize = def->digest_size;484 halg->statesize = sizeof(struct ccp_sha_exp_ctx);485 486 base = &halg->base;487 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);488 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",489 def->drv_name);490 base->cra_flags = CRYPTO_ALG_ASYNC |491 CRYPTO_ALG_ALLOCATES_MEMORY |492 CRYPTO_ALG_KERN_DRIVER_ONLY |493 CRYPTO_ALG_NEED_FALLBACK;494 base->cra_blocksize = def->block_size;495 base->cra_ctxsize = sizeof(struct ccp_ctx) + crypto_dma_padding();496 base->cra_priority = CCP_CRA_PRIORITY;497 base->cra_init = ccp_sha_cra_init;498 base->cra_exit = ccp_sha_cra_exit;499 base->cra_module = THIS_MODULE;500 501 ret = crypto_register_ahash(alg);502 if (ret) {503 pr_err("%s ahash algorithm registration error (%d)\n",504 base->cra_name, ret);505 kfree(ccp_alg);506 return ret;507 }508 509 list_add(&ccp_alg->entry, head);510 511 ret = ccp_register_hmac_alg(head, def, ccp_alg);512 513 return ret;514}515 516int ccp_register_sha_algs(struct list_head *head)517{518 int i, ret;519 unsigned int ccpversion = ccp_version();520 521 for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {522 if (sha_algs[i].version > ccpversion)523 continue;524 ret = ccp_register_sha_alg(head, &sha_algs[i]);525 if (ret)526 return ret;527 }528 529 return 0;530}531