blob: 753f67a36dc505a2ea05f577fccc5ab273d068f6 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* sun8i-ss-hash.c - hardware cryptographic offloader for
* Allwinner A80/A83T SoC
*
* Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
*
* This file add support for MD5 and SHA1/SHA224/SHA256.
*
* You could find the datasheet in Documentation/arch/arm/sunxi.rst
*/
#include <crypto/hmac.h>
#include <crypto/internal/hash.h>
#include <crypto/md5.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include <linux/bottom_half.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/pm_runtime.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "sun8i-ss.h"
static int sun8i_ss_hashkey(struct sun8i_ss_hash_tfm_ctx *tfmctx, const u8 *key,
unsigned int keylen)
{
struct crypto_shash *xtfm;
int ret;
xtfm = crypto_alloc_shash("sha1", 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(xtfm))
return PTR_ERR(xtfm);
ret = crypto_shash_tfm_digest(xtfm, key, keylen, tfmctx->key);
if (ret)
dev_err(tfmctx->ss->dev, "shash digest error ret=%d\n", ret);
crypto_free_shash(xtfm);
return ret;
}
int sun8i_ss_hmac_setkey(struct crypto_ahash *ahash, const u8 *key,
unsigned int keylen)
{
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(ahash);
int digestsize, i;
int bs = crypto_ahash_blocksize(ahash);
int ret;
digestsize = crypto_ahash_digestsize(ahash);
if (keylen > bs) {
ret = sun8i_ss_hashkey(tfmctx, key, keylen);
if (ret)
return ret;
tfmctx->keylen = digestsize;
} else {
tfmctx->keylen = keylen;
memcpy(tfmctx->key, key, keylen);
}
tfmctx->ipad = kzalloc(bs, GFP_KERNEL);
if (!tfmctx->ipad)
return -ENOMEM;
tfmctx->opad = kzalloc(bs, GFP_KERNEL);
if (!tfmctx->opad) {
ret = -ENOMEM;
goto err_opad;
}
memset(tfmctx->key + tfmctx->keylen, 0, bs - tfmctx->keylen);
memcpy(tfmctx->ipad, tfmctx->key, tfmctx->keylen);
memcpy(tfmctx->opad, tfmctx->key, tfmctx->keylen);
for (i = 0; i < bs; i++) {
tfmctx->ipad[i] ^= HMAC_IPAD_VALUE;
tfmctx->opad[i] ^= HMAC_OPAD_VALUE;
}
ret = crypto_ahash_setkey(tfmctx->fallback_tfm, key, keylen);
if (!ret)
return 0;
memzero_explicit(tfmctx->key, keylen);
kfree_sensitive(tfmctx->opad);
err_opad:
kfree_sensitive(tfmctx->ipad);
return ret;
}
int sun8i_ss_hash_init_tfm(struct crypto_ahash *tfm)
{
struct sun8i_ss_hash_tfm_ctx *op = crypto_ahash_ctx(tfm);
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt;
int err;
algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash.base);
op->ss = algt->ss;
/* FALLBACK */
op->fallback_tfm = crypto_alloc_ahash(crypto_ahash_alg_name(tfm), 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback_tfm)) {
dev_err(algt->ss->dev, "Fallback driver could no be loaded\n");
return PTR_ERR(op->fallback_tfm);
}
crypto_ahash_set_statesize(tfm,
crypto_ahash_statesize(op->fallback_tfm));
crypto_ahash_set_reqsize(tfm,
sizeof(struct sun8i_ss_hash_reqctx) +
crypto_ahash_reqsize(op->fallback_tfm));
memcpy(algt->fbname, crypto_ahash_driver_name(op->fallback_tfm),
CRYPTO_MAX_ALG_NAME);
err = pm_runtime_get_sync(op->ss->dev);
if (err < 0)
goto error_pm;
return 0;
error_pm:
pm_runtime_put_noidle(op->ss->dev);
crypto_free_ahash(op->fallback_tfm);
return err;
}
void sun8i_ss_hash_exit_tfm(struct crypto_ahash *tfm)
{
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
kfree_sensitive(tfmctx->ipad);
kfree_sensitive(tfmctx->opad);
crypto_free_ahash(tfmctx->fallback_tfm);
pm_runtime_put_sync_suspend(tfmctx->ss->dev);
}
int sun8i_ss_hash_init(struct ahash_request *areq)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
memset(rctx, 0, sizeof(struct sun8i_ss_hash_reqctx));
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_ahash_init(&rctx->fallback_req);
}
int sun8i_ss_hash_export(struct ahash_request *areq, void *out)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_ahash_export(&rctx->fallback_req, out);
}
int sun8i_ss_hash_import(struct ahash_request *areq, const void *in)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_ahash_import(&rctx->fallback_req, in);
}
int sun8i_ss_hash_final(struct ahash_request *areq)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP;
rctx->fallback_req.result = areq->result;
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG)) {
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt __maybe_unused;
algt = container_of(alg, struct sun8i_ss_alg_template,
alg.hash.base);
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
algt->stat_fb++;
#endif
}
return crypto_ahash_final(&rctx->fallback_req);
}
int sun8i_ss_hash_update(struct ahash_request *areq)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP;
rctx->fallback_req.nbytes = areq->nbytes;
rctx->fallback_req.src = areq->src;
return crypto_ahash_update(&rctx->fallback_req);
}
int sun8i_ss_hash_finup(struct ahash_request *areq)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP;
rctx->fallback_req.nbytes = areq->nbytes;
rctx->fallback_req.src = areq->src;
rctx->fallback_req.result = areq->result;
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG)) {
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt __maybe_unused;
algt = container_of(alg, struct sun8i_ss_alg_template,
alg.hash.base);
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
algt->stat_fb++;
#endif
}
return crypto_ahash_finup(&rctx->fallback_req);
}
static int sun8i_ss_hash_digest_fb(struct ahash_request *areq)
{
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
rctx->fallback_req.base.flags = areq->base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP;
rctx->fallback_req.nbytes = areq->nbytes;
rctx->fallback_req.src = areq->src;
rctx->fallback_req.result = areq->result;
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG)) {
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt __maybe_unused;
algt = container_of(alg, struct sun8i_ss_alg_template,
alg.hash.base);
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
algt->stat_fb++;
#endif
}
return crypto_ahash_digest(&rctx->fallback_req);
}
static int sun8i_ss_run_hash_task(struct sun8i_ss_dev *ss,
struct sun8i_ss_hash_reqctx *rctx,
const char *name)
{
int flow = rctx->flow;
u32 v = SS_START;
int i;
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
ss->flows[flow].stat_req++;
#endif
/* choose between stream0/stream1 */
if (flow)
v |= SS_FLOW1;
else
v |= SS_FLOW0;
v |= rctx->method;
for (i = 0; i < MAX_SG; i++) {
if (!rctx->t_dst[i].addr)
break;
mutex_lock(&ss->mlock);
if (i > 0) {
v |= BIT(17);
writel(rctx->t_dst[i - 1].addr, ss->base + SS_KEY_ADR_REG);
writel(rctx->t_dst[i - 1].addr, ss->base + SS_IV_ADR_REG);
}
dev_dbg(ss->dev,
"Processing SG %d on flow %d %s ctl=%x %d to %d method=%x src=%x dst=%x\n",
i, flow, name, v,
rctx->t_src[i].len, rctx->t_dst[i].len,
rctx->method, rctx->t_src[i].addr, rctx->t_dst[i].addr);
writel(rctx->t_src[i].addr, ss->base + SS_SRC_ADR_REG);
writel(rctx->t_dst[i].addr, ss->base + SS_DST_ADR_REG);
writel(rctx->t_src[i].len, ss->base + SS_LEN_ADR_REG);
writel(BIT(0) | BIT(1), ss->base + SS_INT_CTL_REG);
reinit_completion(&ss->flows[flow].complete);
ss->flows[flow].status = 0;
wmb();
writel(v, ss->base + SS_CTL_REG);
mutex_unlock(&ss->mlock);
wait_for_completion_interruptible_timeout(&ss->flows[flow].complete,
msecs_to_jiffies(2000));
if (ss->flows[flow].status == 0) {
dev_err(ss->dev, "DMA timeout for %s\n", name);
return -EFAULT;
}
}
return 0;
}
static bool sun8i_ss_hash_need_fallback(struct ahash_request *areq)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt;
struct scatterlist *sg;
algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash.base);
if (areq->nbytes == 0) {
algt->stat_fb_len++;
return true;
}
if (areq->nbytes >= MAX_PAD_SIZE - 64) {
algt->stat_fb_len++;
return true;
}
/* we need to reserve one SG for the padding one */
if (sg_nents(areq->src) > MAX_SG - 1) {
algt->stat_fb_sgnum++;
return true;
}
sg = areq->src;
while (sg) {
/* SS can operate hash only on full block size
* since SS support only MD5,sha1,sha224 and sha256, blocksize
* is always 64
*/
/* Only the last block could be bounced to the pad buffer */
if (sg->length % 64 && sg_next(sg)) {
algt->stat_fb_sglen++;
return true;
}
if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
algt->stat_fb_align++;
return true;
}
if (sg->length % 4) {
algt->stat_fb_sglen++;
return true;
}
sg = sg_next(sg);
}
return false;
}
int sun8i_ss_hash_digest(struct ahash_request *areq)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt;
struct sun8i_ss_dev *ss;
struct crypto_engine *engine;
int e;
if (sun8i_ss_hash_need_fallback(areq))
return sun8i_ss_hash_digest_fb(areq);
algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash.base);
ss = algt->ss;
e = sun8i_ss_get_engine_number(ss);
rctx->flow = e;
engine = ss->flows[e].engine;
return crypto_transfer_hash_request_to_engine(engine, areq);
}
static u64 hash_pad(__le32 *buf, unsigned int bufsize, u64 padi, u64 byte_count, bool le, int bs)
{
u64 fill, min_fill, j, k;
__be64 *bebits;
__le64 *lebits;
j = padi;
buf[j++] = cpu_to_le32(0x80);
if (bs == 64) {
fill = 64 - (byte_count % 64);
min_fill = 2 * sizeof(u32) + sizeof(u32);
} else {
fill = 128 - (byte_count % 128);
min_fill = 4 * sizeof(u32) + sizeof(u32);
}
if (fill < min_fill)
fill += bs;
k = j;
j += (fill - min_fill) / sizeof(u32);
if (j * 4 > bufsize) {
pr_err("%s OVERFLOW %llu\n", __func__, j);
return 0;
}
for (; k < j; k++)
buf[k] = 0;
if (le) {
/* MD5 */
lebits = (__le64 *)&buf[j];
*lebits = cpu_to_le64(byte_count << 3);
j += 2;
} else {
if (bs == 64) {
/* sha1 sha224 sha256 */
bebits = (__be64 *)&buf[j];
*bebits = cpu_to_be64(byte_count << 3);
j += 2;
} else {
/* sha384 sha512*/
bebits = (__be64 *)&buf[j];
*bebits = cpu_to_be64(byte_count >> 61);
j += 2;
bebits = (__be64 *)&buf[j];
*bebits = cpu_to_be64(byte_count << 3);
j += 2;
}
}
if (j * 4 > bufsize) {
pr_err("%s OVERFLOW %llu\n", __func__, j);
return 0;
}
return j;
}
/* sun8i_ss_hash_run - run an ahash request
* Send the data of the request to the SS along with an extra SG with padding
*/
int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
{
struct ahash_request *areq = container_of(breq, struct ahash_request, base);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun8i_ss_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
struct sun8i_ss_hash_reqctx *rctx = ahash_request_ctx(areq);
struct ahash_alg *alg = crypto_ahash_alg(tfm);
struct sun8i_ss_alg_template *algt;
struct sun8i_ss_dev *ss;
struct scatterlist *sg;
int bs = crypto_ahash_blocksize(tfm);
int nr_sgs, err, digestsize;
unsigned int len;
u64 byte_count;
void *pad, *result;
int j, i, k, todo;
dma_addr_t addr_res, addr_pad, addr_xpad;
__le32 *bf;
/* HMAC step:
* 0: normal hashing
* 1: IPAD
* 2: OPAD
*/
int hmac = 0;
algt = container_of(alg, struct sun8i_ss_alg_template, alg.hash.base);
ss = algt->ss;
digestsize = crypto_ahash_digestsize(tfm);
if (digestsize == SHA224_DIGEST_SIZE)
digestsize = SHA256_DIGEST_SIZE;
result = ss->flows[rctx->flow].result;
pad = ss->flows[rctx->flow].pad;
bf = (__le32 *)pad;
for (i = 0; i < MAX_SG; i++) {
rctx->t_dst[i].addr = 0;
rctx->t_dst[i].len = 0;
}
#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
algt->stat_req++;
#endif
rctx->method = ss->variant->alg_hash[algt->ss_algo_id];
nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
err = -EINVAL;
goto theend;
}
addr_res = dma_map_single(ss->dev, result, digestsize, DMA_FROM_DEVICE);
if (dma_mapping_error(ss->dev, addr_res)) {
dev_err(ss->dev, "DMA map dest\n");
err = -EINVAL;
goto err_dma_result;
}
j = 0;
len = areq->nbytes;
sg = areq->src;
i = 0;
while (len > 0 && sg) {
if (sg_dma_len(sg) == 0) {
sg = sg_next(sg);
continue;
}
todo = min(len, sg_dma_len(sg));
/* only the last SG could be with a size not modulo64 */
if (todo % 64 == 0) {
rctx->t_src[i].addr = sg_dma_address(sg);
rctx->t_src[i].len = todo / 4;
rctx->t_dst[i].addr = addr_res;
rctx->t_dst[i].len = digestsize / 4;
len -= todo;
} else {
scatterwalk_map_and_copy(bf, sg, 0, todo, 0);
j += todo / 4;
len -= todo;
}
sg = sg_next(sg);
i++;
}
if (len > 0) {
dev_err(ss->dev, "remaining len %d\n", len);
err = -EINVAL;
goto theend;
}
if (j > 0)
i--;
retry:
byte_count = areq->nbytes;
if (tfmctx->keylen && hmac == 0) {
hmac = 1;
/* shift all SG one slot up, to free slot 0 for IPAD */
for (k = 6; k >= 0; k--) {
rctx->t_src[k + 1].addr = rctx->t_src[k].addr;
rctx->t_src[k + 1].len = rctx->t_src[k].len;
rctx->t_dst[k + 1].addr = rctx->t_dst[k].addr;
rctx->t_dst[k + 1].len = rctx->t_dst[k].len;
}
addr_xpad = dma_map_single(ss->dev, tfmctx->ipad, bs, DMA_TO_DEVICE);
err = dma_mapping_error(ss->dev, addr_xpad);
if (err) {
dev_err(ss->dev, "Fail to create DMA mapping of ipad\n");
goto err_dma_xpad;
}
rctx->t_src[0].addr = addr_xpad;
rctx->t_src[0].len = bs / 4;
rctx->t_dst[0].addr = addr_res;
rctx->t_dst[0].len = digestsize / 4;
i++;
byte_count = areq->nbytes + bs;
}
if (tfmctx->keylen && hmac == 2) {
for (i = 0; i < MAX_SG; i++) {
rctx->t_src[i].addr = 0;
rctx->t_src[i].len = 0;
rctx->t_dst[i].addr = 0;
rctx->t_dst[i].len = 0;
}
addr_res = dma_map_single(ss->dev, result, digestsize, DMA_FROM_DEVICE);
if (dma_mapping_error(ss->dev, addr_res)) {
dev_err(ss->dev, "Fail to create DMA mapping of result\n");
err = -EINVAL;
goto err_dma_result;
}
addr_xpad = dma_map_single(ss->dev, tfmctx->opad, bs, DMA_TO_DEVICE);
err = dma_mapping_error(ss->dev, addr_xpad);
if (err) {
dev_err(ss->dev, "Fail to create DMA mapping of opad\n");
goto err_dma_xpad;
}
rctx->t_src[0].addr = addr_xpad;
rctx->t_src[0].len = bs / 4;
memcpy(bf, result, digestsize);
j = digestsize / 4;
i = 1;
byte_count = digestsize + bs;
rctx->t_dst[0].addr = addr_res;
rctx->t_dst[0].len = digestsize / 4;
}
switch (algt->ss_algo_id) {
case SS_ID_HASH_MD5:
j = hash_pad(bf, 4096, j, byte_count, true, bs);
break;
case SS_ID_HASH_SHA1:
case SS_ID_HASH_SHA224:
case SS_ID_HASH_SHA256:
j = hash_pad(bf, 4096, j, byte_count, false, bs);
break;
}
if (!j) {
err = -EINVAL;
goto theend;
}
addr_pad = dma_map_single(ss->dev, pad, j * 4, DMA_TO_DEVICE);
if (dma_mapping_error(ss->dev, addr_pad)) {
dev_err(ss->dev, "DMA error on padding SG\n");
err = -EINVAL;
goto err_dma_pad;
}
rctx->t_src[i].addr = addr_pad;
rctx->t_src[i].len = j;
rctx->t_dst[i].addr = addr_res;
rctx->t_dst[i].len = digestsize / 4;
err = sun8i_ss_run_hash_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
/*
* mini helper for checking dma map/unmap
* flow start for hmac = 0 (and HMAC = 1)
* HMAC = 0
* MAP src
* MAP res
*
* retry:
* if hmac then hmac = 1
* MAP xpad (ipad)
* if hmac == 2
* MAP res
* MAP xpad (opad)
* MAP pad
* ACTION!
* UNMAP pad
* if hmac
* UNMAP xpad
* UNMAP res
* if hmac < 2
* UNMAP SRC
*
* if hmac = 1 then hmac = 2 goto retry
*/
dma_unmap_single(ss->dev, addr_pad, j * 4, DMA_TO_DEVICE);
err_dma_pad:
if (hmac > 0)
dma_unmap_single(ss->dev, addr_xpad, bs, DMA_TO_DEVICE);
err_dma_xpad:
dma_unmap_single(ss->dev, addr_res, digestsize, DMA_FROM_DEVICE);
err_dma_result:
if (hmac < 2)
dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
DMA_TO_DEVICE);
if (hmac == 1 && !err) {
hmac = 2;
goto retry;
}
if (!err)
memcpy(areq->result, result, crypto_ahash_digestsize(tfm));
theend:
local_bh_disable();
crypto_finalize_hash_request(engine, breq, err);
local_bh_enable();
return 0;
}