1 /* 2 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 and 6 * only version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/device.h> 15 #include <linux/interrupt.h> 16 #include <crypto/internal/hash.h> 17 18 #include "common.h" 19 #include "core.h" 20 #include "sha.h" 21 22 /* crypto hw padding constant for first operation */ 23 #define SHA_PADDING 64 24 #define SHA_PADDING_MASK (SHA_PADDING - 1) 25 26 static LIST_HEAD(ahash_algs); 27 28 static const u32 std_iv_sha1[SHA256_DIGEST_SIZE / sizeof(u32)] = { 29 SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4, 0, 0, 0 30 }; 31 32 static const u32 std_iv_sha256[SHA256_DIGEST_SIZE / sizeof(u32)] = { 33 SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, 34 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7 35 }; 36 37 static void qce_ahash_done(void *data) 38 { 39 struct crypto_async_request *async_req = data; 40 struct ahash_request *req = ahash_request_cast(async_req); 41 struct crypto_ahash *ahash = crypto_ahash_reqtfm(req); 42 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 43 struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm); 44 struct qce_device *qce = tmpl->qce; 45 struct qce_result_dump *result = qce->dma.result_buf; 46 unsigned int digestsize = crypto_ahash_digestsize(ahash); 47 int error; 48 u32 status; 49 50 error = qce_dma_terminate_all(&qce->dma); 51 if (error) 52 dev_dbg(qce->dev, "ahash dma termination error (%d)\n", error); 53 54 qce_unmapsg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE, 55 rctx->src_chained); 56 qce_unmapsg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE, 0); 57 58 memcpy(rctx->digest, result->auth_iv, digestsize); 59 if (req->result) 60 memcpy(req->result, result->auth_iv, digestsize); 61 62 rctx->byte_count[0] = cpu_to_be32(result->auth_byte_count[0]); 63 rctx->byte_count[1] = cpu_to_be32(result->auth_byte_count[1]); 64 65 error = qce_check_status(qce, &status); 66 if (error < 0) 67 dev_dbg(qce->dev, "ahash operation error (%x)\n", status); 68 69 req->src = rctx->src_orig; 70 req->nbytes = rctx->nbytes_orig; 71 rctx->last_blk = false; 72 rctx->first_blk = false; 73 74 qce->async_req_done(tmpl->qce, error); 75 } 76 77 static int qce_ahash_async_req_handle(struct crypto_async_request *async_req) 78 { 79 struct ahash_request *req = ahash_request_cast(async_req); 80 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 81 struct qce_sha_ctx *ctx = crypto_tfm_ctx(async_req->tfm); 82 struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm); 83 struct qce_device *qce = tmpl->qce; 84 unsigned long flags = rctx->flags; 85 int ret; 86 87 if (IS_SHA_HMAC(flags)) { 88 rctx->authkey = ctx->authkey; 89 rctx->authklen = QCE_SHA_HMAC_KEY_SIZE; 90 } else if (IS_CMAC(flags)) { 91 rctx->authkey = ctx->authkey; 92 rctx->authklen = AES_KEYSIZE_128; 93 } 94 95 rctx->src_nents = qce_countsg(req->src, req->nbytes, 96 &rctx->src_chained); 97 ret = qce_mapsg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE, 98 rctx->src_chained); 99 if (ret < 0) 100 return ret; 101 102 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ); 103 104 ret = qce_mapsg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE, 0); 105 if (ret < 0) 106 goto error_unmap_src; 107 108 ret = qce_dma_prep_sgs(&qce->dma, req->src, rctx->src_nents, 109 &rctx->result_sg, 1, qce_ahash_done, async_req); 110 if (ret) 111 goto error_unmap_dst; 112 113 qce_dma_issue_pending(&qce->dma); 114 115 ret = qce_start(async_req, tmpl->crypto_alg_type, 0, 0); 116 if (ret) 117 goto error_terminate; 118 119 return 0; 120 121 error_terminate: 122 qce_dma_terminate_all(&qce->dma); 123 error_unmap_dst: 124 qce_unmapsg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE, 0); 125 error_unmap_src: 126 qce_unmapsg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE, 127 rctx->src_chained); 128 return ret; 129 } 130 131 static int qce_ahash_init(struct ahash_request *req) 132 { 133 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 134 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm); 135 const u32 *std_iv = tmpl->std_iv; 136 137 memset(rctx, 0, sizeof(*rctx)); 138 rctx->first_blk = true; 139 rctx->last_blk = false; 140 rctx->flags = tmpl->alg_flags; 141 memcpy(rctx->digest, std_iv, sizeof(rctx->digest)); 142 143 return 0; 144 } 145 146 static int qce_ahash_export(struct ahash_request *req, void *out) 147 { 148 struct crypto_ahash *ahash = crypto_ahash_reqtfm(req); 149 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 150 unsigned long flags = rctx->flags; 151 unsigned int digestsize = crypto_ahash_digestsize(ahash); 152 unsigned int blocksize = 153 crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash)); 154 155 if (IS_SHA1(flags) || IS_SHA1_HMAC(flags)) { 156 struct sha1_state *out_state = out; 157 158 out_state->count = rctx->count; 159 qce_cpu_to_be32p_array((__be32 *)out_state->state, 160 rctx->digest, digestsize); 161 memcpy(out_state->buffer, rctx->buf, blocksize); 162 } else if (IS_SHA256(flags) || IS_SHA256_HMAC(flags)) { 163 struct sha256_state *out_state = out; 164 165 out_state->count = rctx->count; 166 qce_cpu_to_be32p_array((__be32 *)out_state->state, 167 rctx->digest, digestsize); 168 memcpy(out_state->buf, rctx->buf, blocksize); 169 } else { 170 return -EINVAL; 171 } 172 173 return 0; 174 } 175 176 static int qce_import_common(struct ahash_request *req, u64 in_count, 177 const u32 *state, const u8 *buffer, bool hmac) 178 { 179 struct crypto_ahash *ahash = crypto_ahash_reqtfm(req); 180 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 181 unsigned int digestsize = crypto_ahash_digestsize(ahash); 182 unsigned int blocksize; 183 u64 count = in_count; 184 185 blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash)); 186 rctx->count = in_count; 187 memcpy(rctx->buf, buffer, blocksize); 188 189 if (in_count <= blocksize) { 190 rctx->first_blk = 1; 191 } else { 192 rctx->first_blk = 0; 193 /* 194 * For HMAC, there is a hardware padding done when first block 195 * is set. Therefore the byte_count must be incremened by 64 196 * after the first block operation. 197 */ 198 if (hmac) 199 count += SHA_PADDING; 200 } 201 202 rctx->byte_count[0] = (__force __be32)(count & ~SHA_PADDING_MASK); 203 rctx->byte_count[1] = (__force __be32)(count >> 32); 204 qce_cpu_to_be32p_array((__be32 *)rctx->digest, (const u8 *)state, 205 digestsize); 206 rctx->buflen = (unsigned int)(in_count & (blocksize - 1)); 207 208 return 0; 209 } 210 211 static int qce_ahash_import(struct ahash_request *req, const void *in) 212 { 213 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 214 unsigned long flags = rctx->flags; 215 bool hmac = IS_SHA_HMAC(flags); 216 int ret = -EINVAL; 217 218 if (IS_SHA1(flags) || IS_SHA1_HMAC(flags)) { 219 const struct sha1_state *state = in; 220 221 ret = qce_import_common(req, state->count, state->state, 222 state->buffer, hmac); 223 } else if (IS_SHA256(flags) || IS_SHA256_HMAC(flags)) { 224 const struct sha256_state *state = in; 225 226 ret = qce_import_common(req, state->count, state->state, 227 state->buf, hmac); 228 } 229 230 return ret; 231 } 232 233 static int qce_ahash_update(struct ahash_request *req) 234 { 235 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); 236 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 237 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm); 238 struct qce_device *qce = tmpl->qce; 239 struct scatterlist *sg_last, *sg; 240 unsigned int total, len; 241 unsigned int hash_later; 242 unsigned int nbytes; 243 unsigned int blocksize; 244 245 blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); 246 rctx->count += req->nbytes; 247 248 /* check for buffer from previous updates and append it */ 249 total = req->nbytes + rctx->buflen; 250 251 if (total <= blocksize) { 252 scatterwalk_map_and_copy(rctx->buf + rctx->buflen, req->src, 253 0, req->nbytes, 0); 254 rctx->buflen += req->nbytes; 255 return 0; 256 } 257 258 /* save the original req structure fields */ 259 rctx->src_orig = req->src; 260 rctx->nbytes_orig = req->nbytes; 261 262 /* 263 * if we have data from previous update copy them on buffer. The old 264 * data will be combined with current request bytes. 265 */ 266 if (rctx->buflen) 267 memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen); 268 269 /* calculate how many bytes will be hashed later */ 270 hash_later = total % blocksize; 271 if (hash_later) { 272 unsigned int src_offset = req->nbytes - hash_later; 273 scatterwalk_map_and_copy(rctx->buf, req->src, src_offset, 274 hash_later, 0); 275 } 276 277 /* here nbytes is multiple of blocksize */ 278 nbytes = total - hash_later; 279 280 len = rctx->buflen; 281 sg = sg_last = req->src; 282 283 while (len < nbytes && sg) { 284 if (len + sg_dma_len(sg) > nbytes) 285 break; 286 len += sg_dma_len(sg); 287 sg_last = sg; 288 sg = sg_next(sg); 289 } 290 291 if (!sg_last) 292 return -EINVAL; 293 294 sg_mark_end(sg_last); 295 296 if (rctx->buflen) { 297 sg_init_table(rctx->sg, 2); 298 sg_set_buf(rctx->sg, rctx->tmpbuf, rctx->buflen); 299 scatterwalk_sg_chain(rctx->sg, 2, req->src); 300 req->src = rctx->sg; 301 } 302 303 req->nbytes = nbytes; 304 rctx->buflen = hash_later; 305 306 return qce->async_req_enqueue(tmpl->qce, &req->base); 307 } 308 309 static int qce_ahash_final(struct ahash_request *req) 310 { 311 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 312 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm); 313 struct qce_device *qce = tmpl->qce; 314 315 if (!rctx->buflen) 316 return 0; 317 318 rctx->last_blk = true; 319 320 rctx->src_orig = req->src; 321 rctx->nbytes_orig = req->nbytes; 322 323 memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen); 324 sg_init_one(rctx->sg, rctx->tmpbuf, rctx->buflen); 325 326 req->src = rctx->sg; 327 req->nbytes = rctx->buflen; 328 329 return qce->async_req_enqueue(tmpl->qce, &req->base); 330 } 331 332 static int qce_ahash_digest(struct ahash_request *req) 333 { 334 struct qce_sha_reqctx *rctx = ahash_request_ctx(req); 335 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm); 336 struct qce_device *qce = tmpl->qce; 337 int ret; 338 339 ret = qce_ahash_init(req); 340 if (ret) 341 return ret; 342 343 rctx->src_orig = req->src; 344 rctx->nbytes_orig = req->nbytes; 345 rctx->first_blk = true; 346 rctx->last_blk = true; 347 348 return qce->async_req_enqueue(tmpl->qce, &req->base); 349 } 350 351 struct qce_ahash_result { 352 struct completion completion; 353 int error; 354 }; 355 356 static void qce_digest_complete(struct crypto_async_request *req, int error) 357 { 358 struct qce_ahash_result *result = req->data; 359 360 if (error == -EINPROGRESS) 361 return; 362 363 result->error = error; 364 complete(&result->completion); 365 } 366 367 static int qce_ahash_hmac_setkey(struct crypto_ahash *tfm, const u8 *key, 368 unsigned int keylen) 369 { 370 unsigned int digestsize = crypto_ahash_digestsize(tfm); 371 struct qce_sha_ctx *ctx = crypto_tfm_ctx(&tfm->base); 372 struct qce_ahash_result result; 373 struct ahash_request *req; 374 struct scatterlist sg; 375 unsigned int blocksize; 376 struct crypto_ahash *ahash_tfm; 377 u8 *buf; 378 int ret; 379 const char *alg_name; 380 381 blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); 382 memset(ctx->authkey, 0, sizeof(ctx->authkey)); 383 384 if (keylen <= blocksize) { 385 memcpy(ctx->authkey, key, keylen); 386 return 0; 387 } 388 389 if (digestsize == SHA1_DIGEST_SIZE) 390 alg_name = "sha1-qce"; 391 else if (digestsize == SHA256_DIGEST_SIZE) 392 alg_name = "sha256-qce"; 393 else 394 return -EINVAL; 395 396 ahash_tfm = crypto_alloc_ahash(alg_name, CRYPTO_ALG_TYPE_AHASH, 397 CRYPTO_ALG_TYPE_AHASH_MASK); 398 if (IS_ERR(ahash_tfm)) 399 return PTR_ERR(ahash_tfm); 400 401 req = ahash_request_alloc(ahash_tfm, GFP_KERNEL); 402 if (!req) { 403 ret = -ENOMEM; 404 goto err_free_ahash; 405 } 406 407 init_completion(&result.completion); 408 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, 409 qce_digest_complete, &result); 410 crypto_ahash_clear_flags(ahash_tfm, ~0); 411 412 buf = kzalloc(keylen + QCE_MAX_ALIGN_SIZE, GFP_KERNEL); 413 if (!buf) { 414 ret = -ENOMEM; 415 goto err_free_req; 416 } 417 418 memcpy(buf, key, keylen); 419 sg_init_one(&sg, buf, keylen); 420 ahash_request_set_crypt(req, &sg, ctx->authkey, keylen); 421 422 ret = crypto_ahash_digest(req); 423 if (ret == -EINPROGRESS || ret == -EBUSY) { 424 ret = wait_for_completion_interruptible(&result.completion); 425 if (!ret) 426 ret = result.error; 427 } 428 429 if (ret) 430 crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); 431 432 kfree(buf); 433 err_free_req: 434 ahash_request_free(req); 435 err_free_ahash: 436 crypto_free_ahash(ahash_tfm); 437 return ret; 438 } 439 440 static int qce_ahash_cra_init(struct crypto_tfm *tfm) 441 { 442 struct crypto_ahash *ahash = __crypto_ahash_cast(tfm); 443 struct qce_sha_ctx *ctx = crypto_tfm_ctx(tfm); 444 445 crypto_ahash_set_reqsize(ahash, sizeof(struct qce_sha_reqctx)); 446 memset(ctx, 0, sizeof(*ctx)); 447 return 0; 448 } 449 450 struct qce_ahash_def { 451 unsigned long flags; 452 const char *name; 453 const char *drv_name; 454 unsigned int digestsize; 455 unsigned int blocksize; 456 unsigned int statesize; 457 const u32 *std_iv; 458 }; 459 460 static const struct qce_ahash_def ahash_def[] = { 461 { 462 .flags = QCE_HASH_SHA1, 463 .name = "sha1", 464 .drv_name = "sha1-qce", 465 .digestsize = SHA1_DIGEST_SIZE, 466 .blocksize = SHA1_BLOCK_SIZE, 467 .statesize = sizeof(struct sha1_state), 468 .std_iv = std_iv_sha1, 469 }, 470 { 471 .flags = QCE_HASH_SHA256, 472 .name = "sha256", 473 .drv_name = "sha256-qce", 474 .digestsize = SHA256_DIGEST_SIZE, 475 .blocksize = SHA256_BLOCK_SIZE, 476 .statesize = sizeof(struct sha256_state), 477 .std_iv = std_iv_sha256, 478 }, 479 { 480 .flags = QCE_HASH_SHA1_HMAC, 481 .name = "hmac(sha1)", 482 .drv_name = "hmac-sha1-qce", 483 .digestsize = SHA1_DIGEST_SIZE, 484 .blocksize = SHA1_BLOCK_SIZE, 485 .statesize = sizeof(struct sha1_state), 486 .std_iv = std_iv_sha1, 487 }, 488 { 489 .flags = QCE_HASH_SHA256_HMAC, 490 .name = "hmac(sha256)", 491 .drv_name = "hmac-sha256-qce", 492 .digestsize = SHA256_DIGEST_SIZE, 493 .blocksize = SHA256_BLOCK_SIZE, 494 .statesize = sizeof(struct sha256_state), 495 .std_iv = std_iv_sha256, 496 }, 497 }; 498 499 static int qce_ahash_register_one(const struct qce_ahash_def *def, 500 struct qce_device *qce) 501 { 502 struct qce_alg_template *tmpl; 503 struct ahash_alg *alg; 504 struct crypto_alg *base; 505 int ret; 506 507 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL); 508 if (!tmpl) 509 return -ENOMEM; 510 511 tmpl->std_iv = def->std_iv; 512 513 alg = &tmpl->alg.ahash; 514 alg->init = qce_ahash_init; 515 alg->update = qce_ahash_update; 516 alg->final = qce_ahash_final; 517 alg->digest = qce_ahash_digest; 518 alg->export = qce_ahash_export; 519 alg->import = qce_ahash_import; 520 if (IS_SHA_HMAC(def->flags)) 521 alg->setkey = qce_ahash_hmac_setkey; 522 alg->halg.digestsize = def->digestsize; 523 alg->halg.statesize = def->statesize; 524 525 base = &alg->halg.base; 526 base->cra_blocksize = def->blocksize; 527 base->cra_priority = 300; 528 base->cra_flags = CRYPTO_ALG_ASYNC; 529 base->cra_ctxsize = sizeof(struct qce_sha_ctx); 530 base->cra_alignmask = 0; 531 base->cra_module = THIS_MODULE; 532 base->cra_init = qce_ahash_cra_init; 533 INIT_LIST_HEAD(&base->cra_list); 534 535 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 536 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 537 def->drv_name); 538 539 INIT_LIST_HEAD(&tmpl->entry); 540 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_AHASH; 541 tmpl->alg_flags = def->flags; 542 tmpl->qce = qce; 543 544 ret = crypto_register_ahash(alg); 545 if (ret) { 546 kfree(tmpl); 547 dev_err(qce->dev, "%s registration failed\n", base->cra_name); 548 return ret; 549 } 550 551 list_add_tail(&tmpl->entry, &ahash_algs); 552 dev_dbg(qce->dev, "%s is registered\n", base->cra_name); 553 return 0; 554 } 555 556 static void qce_ahash_unregister(struct qce_device *qce) 557 { 558 struct qce_alg_template *tmpl, *n; 559 560 list_for_each_entry_safe(tmpl, n, &ahash_algs, entry) { 561 crypto_unregister_ahash(&tmpl->alg.ahash); 562 list_del(&tmpl->entry); 563 kfree(tmpl); 564 } 565 } 566 567 static int qce_ahash_register(struct qce_device *qce) 568 { 569 int ret, i; 570 571 for (i = 0; i < ARRAY_SIZE(ahash_def); i++) { 572 ret = qce_ahash_register_one(&ahash_def[i], qce); 573 if (ret) 574 goto err; 575 } 576 577 return 0; 578 err: 579 qce_ahash_unregister(qce); 580 return ret; 581 } 582 583 const struct qce_algo_ops ahash_ops = { 584 .type = CRYPTO_ALG_TYPE_AHASH, 585 .register_algs = qce_ahash_register, 586 .unregister_algs = qce_ahash_unregister, 587 .async_req_handle = qce_ahash_async_req_handle, 588 }; 589