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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.4 */5 6#include <linux/device.h>7#include <linux/dma-mapping.h>8#include <linux/interrupt.h>9#include <crypto/internal/hash.h>10 11#include "common.h"12#include "core.h"13#include "sha.h"14 15struct qce_sha_saved_state {16 u8 pending_buf[QCE_SHA_MAX_BLOCKSIZE];17 u8 partial_digest[QCE_SHA_MAX_DIGESTSIZE];18 __be32 byte_count[2];19 unsigned int pending_buflen;20 unsigned int flags;21 u64 count;22 bool first_blk;23};24 25static LIST_HEAD(ahash_algs);26 27static const u32 std_iv_sha1[SHA256_DIGEST_SIZE / sizeof(u32)] = {28 SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4, 0, 0, 029};30 31static const u32 std_iv_sha256[SHA256_DIGEST_SIZE / sizeof(u32)] = {32 SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,33 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H734};35 36static void qce_ahash_done(void *data)37{38 struct crypto_async_request *async_req = data;39 struct ahash_request *req = ahash_request_cast(async_req);40 struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);41 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);42 struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm);43 struct qce_device *qce = tmpl->qce;44 struct qce_result_dump *result = qce->dma.result_buf;45 unsigned int digestsize = crypto_ahash_digestsize(ahash);46 int error;47 u32 status;48 49 error = qce_dma_terminate_all(&qce->dma);50 if (error)51 dev_dbg(qce->dev, "ahash dma termination error (%d)\n", error);52 53 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);54 dma_unmap_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);55 56 memcpy(rctx->digest, result->auth_iv, digestsize);57 if (req->result && rctx->last_blk)58 memcpy(req->result, result->auth_iv, digestsize);59 60 rctx->byte_count[0] = cpu_to_be32(result->auth_byte_count[0]);61 rctx->byte_count[1] = cpu_to_be32(result->auth_byte_count[1]);62 63 error = qce_check_status(qce, &status);64 if (error < 0)65 dev_dbg(qce->dev, "ahash operation error (%x)\n", status);66 67 req->src = rctx->src_orig;68 req->nbytes = rctx->nbytes_orig;69 rctx->last_blk = false;70 rctx->first_blk = false;71 72 qce->async_req_done(tmpl->qce, error);73}74 75static int qce_ahash_async_req_handle(struct crypto_async_request *async_req)76{77 struct ahash_request *req = ahash_request_cast(async_req);78 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);79 struct qce_sha_ctx *ctx = crypto_tfm_ctx(async_req->tfm);80 struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm);81 struct qce_device *qce = tmpl->qce;82 unsigned long flags = rctx->flags;83 int ret;84 85 if (IS_SHA_HMAC(flags)) {86 rctx->authkey = ctx->authkey;87 rctx->authklen = QCE_SHA_HMAC_KEY_SIZE;88 } else if (IS_CMAC(flags)) {89 rctx->authkey = ctx->authkey;90 rctx->authklen = AES_KEYSIZE_128;91 }92 93 rctx->src_nents = sg_nents_for_len(req->src, req->nbytes);94 if (rctx->src_nents < 0) {95 dev_err(qce->dev, "Invalid numbers of src SG.\n");96 return rctx->src_nents;97 }98 99 ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);100 if (!ret)101 return -EIO;102 103 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);104 105 ret = dma_map_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);106 if (!ret) {107 ret = -EIO;108 goto error_unmap_src;109 }110 111 ret = qce_dma_prep_sgs(&qce->dma, req->src, rctx->src_nents,112 &rctx->result_sg, 1, qce_ahash_done, async_req);113 if (ret)114 goto error_unmap_dst;115 116 qce_dma_issue_pending(&qce->dma);117 118 ret = qce_start(async_req, tmpl->crypto_alg_type);119 if (ret)120 goto error_terminate;121 122 return 0;123 124error_terminate:125 qce_dma_terminate_all(&qce->dma);126error_unmap_dst:127 dma_unmap_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);128error_unmap_src:129 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);130 return ret;131}132 133static int qce_ahash_init(struct ahash_request *req)134{135 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);136 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);137 const u32 *std_iv = tmpl->std_iv;138 139 memset(rctx, 0, sizeof(*rctx));140 rctx->first_blk = true;141 rctx->last_blk = false;142 rctx->flags = tmpl->alg_flags;143 memcpy(rctx->digest, std_iv, sizeof(rctx->digest));144 145 return 0;146}147 148static int qce_ahash_export(struct ahash_request *req, void *out)149{150 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);151 struct qce_sha_saved_state *export_state = out;152 153 memcpy(export_state->pending_buf, rctx->buf, rctx->buflen);154 memcpy(export_state->partial_digest, rctx->digest, sizeof(rctx->digest));155 export_state->byte_count[0] = rctx->byte_count[0];156 export_state->byte_count[1] = rctx->byte_count[1];157 export_state->pending_buflen = rctx->buflen;158 export_state->count = rctx->count;159 export_state->first_blk = rctx->first_blk;160 export_state->flags = rctx->flags;161 162 return 0;163}164 165static int qce_ahash_import(struct ahash_request *req, const void *in)166{167 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);168 const struct qce_sha_saved_state *import_state = in;169 170 memset(rctx, 0, sizeof(*rctx));171 rctx->count = import_state->count;172 rctx->buflen = import_state->pending_buflen;173 rctx->first_blk = import_state->first_blk;174 rctx->flags = import_state->flags;175 rctx->byte_count[0] = import_state->byte_count[0];176 rctx->byte_count[1] = import_state->byte_count[1];177 memcpy(rctx->buf, import_state->pending_buf, rctx->buflen);178 memcpy(rctx->digest, import_state->partial_digest, sizeof(rctx->digest));179 180 return 0;181}182 183static int qce_ahash_update(struct ahash_request *req)184{185 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);186 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);187 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);188 struct qce_device *qce = tmpl->qce;189 struct scatterlist *sg_last, *sg;190 unsigned int total, len;191 unsigned int hash_later;192 unsigned int nbytes;193 unsigned int blocksize;194 195 blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));196 rctx->count += req->nbytes;197 198 /* check for buffer from previous updates and append it */199 total = req->nbytes + rctx->buflen;200 201 if (total <= blocksize) {202 scatterwalk_map_and_copy(rctx->buf + rctx->buflen, req->src,203 0, req->nbytes, 0);204 rctx->buflen += req->nbytes;205 return 0;206 }207 208 /* save the original req structure fields */209 rctx->src_orig = req->src;210 rctx->nbytes_orig = req->nbytes;211 212 /*213 * if we have data from previous update copy them on buffer. The old214 * data will be combined with current request bytes.215 */216 if (rctx->buflen)217 memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen);218 219 /* calculate how many bytes will be hashed later */220 hash_later = total % blocksize;221 222 /*223 * At this point, there is more than one block size of data. If224 * the available data to transfer is exactly a multiple of block225 * size, save the last block to be transferred in qce_ahash_final226 * (with the last block bit set) if this is indeed the end of data227 * stream. If not this saved block will be transferred as part of228 * next update. If this block is not held back and if this is229 * indeed the end of data stream, the digest obtained will be wrong230 * since qce_ahash_final will see that rctx->buflen is 0 and return231 * doing nothing which in turn means that a digest will not be232 * copied to the destination result buffer. qce_ahash_final cannot233 * be made to alter this behavior and allowed to proceed if234 * rctx->buflen is 0 because the crypto engine BAM does not allow235 * for zero length transfers.236 */237 if (!hash_later)238 hash_later = blocksize;239 240 if (hash_later) {241 unsigned int src_offset = req->nbytes - hash_later;242 scatterwalk_map_and_copy(rctx->buf, req->src, src_offset,243 hash_later, 0);244 }245 246 /* here nbytes is multiple of blocksize */247 nbytes = total - hash_later;248 249 len = rctx->buflen;250 sg = sg_last = req->src;251 252 while (len < nbytes && sg) {253 if (len + sg_dma_len(sg) > nbytes)254 break;255 len += sg_dma_len(sg);256 sg_last = sg;257 sg = sg_next(sg);258 }259 260 if (!sg_last)261 return -EINVAL;262 263 if (rctx->buflen) {264 sg_init_table(rctx->sg, 2);265 sg_set_buf(rctx->sg, rctx->tmpbuf, rctx->buflen);266 sg_chain(rctx->sg, 2, req->src);267 req->src = rctx->sg;268 }269 270 req->nbytes = nbytes;271 rctx->buflen = hash_later;272 273 return qce->async_req_enqueue(tmpl->qce, &req->base);274}275 276static int qce_ahash_final(struct ahash_request *req)277{278 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);279 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);280 struct qce_device *qce = tmpl->qce;281 282 if (!rctx->buflen) {283 if (tmpl->hash_zero)284 memcpy(req->result, tmpl->hash_zero,285 tmpl->alg.ahash.halg.digestsize);286 return 0;287 }288 289 rctx->last_blk = true;290 291 rctx->src_orig = req->src;292 rctx->nbytes_orig = req->nbytes;293 294 memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen);295 sg_init_one(rctx->sg, rctx->tmpbuf, rctx->buflen);296 297 req->src = rctx->sg;298 req->nbytes = rctx->buflen;299 300 return qce->async_req_enqueue(tmpl->qce, &req->base);301}302 303static int qce_ahash_digest(struct ahash_request *req)304{305 struct qce_sha_reqctx *rctx = ahash_request_ctx_dma(req);306 struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);307 struct qce_device *qce = tmpl->qce;308 int ret;309 310 ret = qce_ahash_init(req);311 if (ret)312 return ret;313 314 rctx->src_orig = req->src;315 rctx->nbytes_orig = req->nbytes;316 rctx->first_blk = true;317 rctx->last_blk = true;318 319 if (!rctx->nbytes_orig) {320 if (tmpl->hash_zero)321 memcpy(req->result, tmpl->hash_zero,322 tmpl->alg.ahash.halg.digestsize);323 return 0;324 }325 326 return qce->async_req_enqueue(tmpl->qce, &req->base);327}328 329static int qce_ahash_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,330 unsigned int keylen)331{332 unsigned int digestsize = crypto_ahash_digestsize(tfm);333 struct qce_sha_ctx *ctx = crypto_tfm_ctx(&tfm->base);334 struct crypto_wait wait;335 struct ahash_request *req;336 struct scatterlist sg;337 unsigned int blocksize;338 struct crypto_ahash *ahash_tfm;339 u8 *buf;340 int ret;341 const char *alg_name;342 343 blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));344 memset(ctx->authkey, 0, sizeof(ctx->authkey));345 346 if (keylen <= blocksize) {347 memcpy(ctx->authkey, key, keylen);348 return 0;349 }350 351 if (digestsize == SHA1_DIGEST_SIZE)352 alg_name = "sha1-qce";353 else if (digestsize == SHA256_DIGEST_SIZE)354 alg_name = "sha256-qce";355 else356 return -EINVAL;357 358 ahash_tfm = crypto_alloc_ahash(alg_name, 0, 0);359 if (IS_ERR(ahash_tfm))360 return PTR_ERR(ahash_tfm);361 362 req = ahash_request_alloc(ahash_tfm, GFP_KERNEL);363 if (!req) {364 ret = -ENOMEM;365 goto err_free_ahash;366 }367 368 crypto_init_wait(&wait);369 ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,370 crypto_req_done, &wait);371 crypto_ahash_clear_flags(ahash_tfm, ~0);372 373 buf = kzalloc(keylen + QCE_MAX_ALIGN_SIZE, GFP_KERNEL);374 if (!buf) {375 ret = -ENOMEM;376 goto err_free_req;377 }378 379 memcpy(buf, key, keylen);380 sg_init_one(&sg, buf, keylen);381 ahash_request_set_crypt(req, &sg, ctx->authkey, keylen);382 383 ret = crypto_wait_req(crypto_ahash_digest(req), &wait);384 385 kfree(buf);386err_free_req:387 ahash_request_free(req);388err_free_ahash:389 crypto_free_ahash(ahash_tfm);390 return ret;391}392 393static int qce_ahash_cra_init(struct crypto_tfm *tfm)394{395 struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);396 struct qce_sha_ctx *ctx = crypto_tfm_ctx(tfm);397 398 crypto_ahash_set_reqsize_dma(ahash, sizeof(struct qce_sha_reqctx));399 memset(ctx, 0, sizeof(*ctx));400 return 0;401}402 403struct qce_ahash_def {404 unsigned long flags;405 const char *name;406 const char *drv_name;407 unsigned int digestsize;408 unsigned int blocksize;409 unsigned int statesize;410 const u32 *std_iv;411};412 413static const struct qce_ahash_def ahash_def[] = {414 {415 .flags = QCE_HASH_SHA1,416 .name = "sha1",417 .drv_name = "sha1-qce",418 .digestsize = SHA1_DIGEST_SIZE,419 .blocksize = SHA1_BLOCK_SIZE,420 .statesize = sizeof(struct qce_sha_saved_state),421 .std_iv = std_iv_sha1,422 },423 {424 .flags = QCE_HASH_SHA256,425 .name = "sha256",426 .drv_name = "sha256-qce",427 .digestsize = SHA256_DIGEST_SIZE,428 .blocksize = SHA256_BLOCK_SIZE,429 .statesize = sizeof(struct qce_sha_saved_state),430 .std_iv = std_iv_sha256,431 },432 {433 .flags = QCE_HASH_SHA1_HMAC,434 .name = "hmac(sha1)",435 .drv_name = "hmac-sha1-qce",436 .digestsize = SHA1_DIGEST_SIZE,437 .blocksize = SHA1_BLOCK_SIZE,438 .statesize = sizeof(struct qce_sha_saved_state),439 .std_iv = std_iv_sha1,440 },441 {442 .flags = QCE_HASH_SHA256_HMAC,443 .name = "hmac(sha256)",444 .drv_name = "hmac-sha256-qce",445 .digestsize = SHA256_DIGEST_SIZE,446 .blocksize = SHA256_BLOCK_SIZE,447 .statesize = sizeof(struct qce_sha_saved_state),448 .std_iv = std_iv_sha256,449 },450};451 452static int qce_ahash_register_one(const struct qce_ahash_def *def,453 struct qce_device *qce)454{455 struct qce_alg_template *tmpl;456 struct ahash_alg *alg;457 struct crypto_alg *base;458 int ret;459 460 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);461 if (!tmpl)462 return -ENOMEM;463 464 tmpl->std_iv = def->std_iv;465 466 alg = &tmpl->alg.ahash;467 alg->init = qce_ahash_init;468 alg->update = qce_ahash_update;469 alg->final = qce_ahash_final;470 alg->digest = qce_ahash_digest;471 alg->export = qce_ahash_export;472 alg->import = qce_ahash_import;473 if (IS_SHA_HMAC(def->flags))474 alg->setkey = qce_ahash_hmac_setkey;475 alg->halg.digestsize = def->digestsize;476 alg->halg.statesize = def->statesize;477 478 if (IS_SHA1(def->flags))479 tmpl->hash_zero = sha1_zero_message_hash;480 else if (IS_SHA256(def->flags))481 tmpl->hash_zero = sha256_zero_message_hash;482 483 base = &alg->halg.base;484 base->cra_blocksize = def->blocksize;485 base->cra_priority = 300;486 base->cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY;487 base->cra_ctxsize = sizeof(struct qce_sha_ctx);488 base->cra_alignmask = 0;489 base->cra_module = THIS_MODULE;490 base->cra_init = qce_ahash_cra_init;491 492 snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);493 snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",494 def->drv_name);495 496 INIT_LIST_HEAD(&tmpl->entry);497 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_AHASH;498 tmpl->alg_flags = def->flags;499 tmpl->qce = qce;500 501 ret = crypto_register_ahash(alg);502 if (ret) {503 dev_err(qce->dev, "%s registration failed\n", base->cra_name);504 kfree(tmpl);505 return ret;506 }507 508 list_add_tail(&tmpl->entry, &ahash_algs);509 dev_dbg(qce->dev, "%s is registered\n", base->cra_name);510 return 0;511}512 513static void qce_ahash_unregister(struct qce_device *qce)514{515 struct qce_alg_template *tmpl, *n;516 517 list_for_each_entry_safe(tmpl, n, &ahash_algs, entry) {518 crypto_unregister_ahash(&tmpl->alg.ahash);519 list_del(&tmpl->entry);520 kfree(tmpl);521 }522}523 524static int qce_ahash_register(struct qce_device *qce)525{526 int ret, i;527 528 for (i = 0; i < ARRAY_SIZE(ahash_def); i++) {529 ret = qce_ahash_register_one(&ahash_def[i], qce);530 if (ret)531 goto err;532 }533 534 return 0;535err:536 qce_ahash_unregister(qce);537 return ret;538}539 540const struct qce_algo_ops ahash_ops = {541 .type = CRYPTO_ALG_TYPE_AHASH,542 .register_algs = qce_ahash_register,543 .unregister_algs = qce_ahash_unregister,544 .async_req_handle = qce_ahash_async_req_handle,545};546