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9aedd10fe3
The cloned child of ahash that uses shash under the hood should use
shash helpers (like crypto_shash_setkey()).
The following panic may be observed on TCP-AO selftests:
> ==================================================================
> BUG: KASAN: wild-memory-access in crypto_mod_get+0x1b/0x60
> Write of size 4 at addr 5d5be0ff5c415e14 by task connect_ipv4/1397
>
> CPU: 0 PID: 1397 Comm: connect_ipv4 Tainted: G W 6.6.0+ #47
> Call Trace:
> <TASK>
> dump_stack_lvl+0x46/0x70
> kasan_report+0xc3/0xf0
> kasan_check_range+0xec/0x190
> crypto_mod_get+0x1b/0x60
> crypto_spawn_alg+0x53/0x140
> crypto_spawn_tfm2+0x13/0x60
> hmac_init_tfm+0x25/0x60
> crypto_ahash_setkey+0x8b/0x100
> tcp_ao_add_cmd+0xe7a/0x1120
> do_tcp_setsockopt+0x5ed/0x12a0
> do_sock_setsockopt+0x82/0x100
> __sys_setsockopt+0xe9/0x160
> __x64_sys_setsockopt+0x60/0x70
> do_syscall_64+0x3c/0xe0
> entry_SYSCALL_64_after_hwframe+0x46/0x4e
> ==================================================================
> general protection fault, probably for non-canonical address 0x5d5be0ff5c415e14: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 1397 Comm: connect_ipv4 Tainted: G B W 6.6.0+ #47
> Call Trace:
> <TASK>
> ? die_addr+0x3c/0xa0
> ? exc_general_protection+0x144/0x210
> ? asm_exc_general_protection+0x22/0x30
> ? add_taint+0x26/0x90
> ? crypto_mod_get+0x20/0x60
> ? crypto_mod_get+0x1b/0x60
> ? ahash_def_finup_done1+0x58/0x80
> crypto_spawn_alg+0x53/0x140
> crypto_spawn_tfm2+0x13/0x60
> hmac_init_tfm+0x25/0x60
> crypto_ahash_setkey+0x8b/0x100
> tcp_ao_add_cmd+0xe7a/0x1120
> do_tcp_setsockopt+0x5ed/0x12a0
> do_sock_setsockopt+0x82/0x100
> __sys_setsockopt+0xe9/0x160
> __x64_sys_setsockopt+0x60/0x70
> do_syscall_64+0x3c/0xe0
> entry_SYSCALL_64_after_hwframe+0x46/0x4e
> </TASK>
> RIP: 0010:crypto_mod_get+0x20/0x60
Make sure that the child/clone has using_shash set when parent is
an shash user.
Fixes: 2f1f34c1bf
("crypto: ahash - optimize performance when wrapping shash")
Cc: David Ahern <dsahern@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Francesco Ruggeri <fruggeri05@gmail.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Salam Noureddine <noureddine@arista.com>
Cc: netdev@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Dmitry Safonov <dima@arista.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
776 lines
18 KiB
C
776 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Asynchronous Cryptographic Hash operations.
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*
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* This is the implementation of the ahash (asynchronous hash) API. It differs
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* from shash (synchronous hash) in that ahash supports asynchronous operations,
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* and it hashes data from scatterlists instead of virtually addressed buffers.
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*
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* The ahash API provides access to both ahash and shash algorithms. The shash
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* API only provides access to shash algorithms.
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*
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* Copyright (c) 2008 Loc Ho <lho@amcc.com>
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*/
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#include <crypto/scatterwalk.h>
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#include <linux/cryptouser.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "hash.h"
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#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
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static inline struct crypto_istat_hash *ahash_get_stat(struct ahash_alg *alg)
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{
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return hash_get_stat(&alg->halg);
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}
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static inline int crypto_ahash_errstat(struct ahash_alg *alg, int err)
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{
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if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
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return err;
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if (err && err != -EINPROGRESS && err != -EBUSY)
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atomic64_inc(&ahash_get_stat(alg)->err_cnt);
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return err;
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}
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/*
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* For an ahash tfm that is using an shash algorithm (instead of an ahash
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* algorithm), this returns the underlying shash tfm.
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*/
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static inline struct crypto_shash *ahash_to_shash(struct crypto_ahash *tfm)
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{
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return *(struct crypto_shash **)crypto_ahash_ctx(tfm);
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}
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static inline struct shash_desc *prepare_shash_desc(struct ahash_request *req,
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struct crypto_ahash *tfm)
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{
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = ahash_to_shash(tfm);
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return desc;
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}
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int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
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{
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struct crypto_hash_walk walk;
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int nbytes;
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for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
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nbytes = crypto_hash_walk_done(&walk, nbytes))
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nbytes = crypto_shash_update(desc, walk.data, nbytes);
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return nbytes;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_update);
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int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
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{
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struct crypto_hash_walk walk;
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int nbytes;
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nbytes = crypto_hash_walk_first(req, &walk);
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if (!nbytes)
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return crypto_shash_final(desc, req->result);
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do {
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nbytes = crypto_hash_walk_last(&walk) ?
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crypto_shash_finup(desc, walk.data, nbytes,
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req->result) :
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crypto_shash_update(desc, walk.data, nbytes);
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nbytes = crypto_hash_walk_done(&walk, nbytes);
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} while (nbytes > 0);
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return nbytes;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_finup);
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int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
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{
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unsigned int nbytes = req->nbytes;
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struct scatterlist *sg;
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unsigned int offset;
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int err;
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if (nbytes &&
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(sg = req->src, offset = sg->offset,
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nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
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void *data;
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data = kmap_local_page(sg_page(sg));
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err = crypto_shash_digest(desc, data + offset, nbytes,
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req->result);
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kunmap_local(data);
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} else
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err = crypto_shash_init(desc) ?:
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shash_ahash_finup(req, desc);
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return err;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_digest);
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static void crypto_exit_ahash_using_shash(struct crypto_tfm *tfm)
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{
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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crypto_free_shash(*ctx);
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}
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static int crypto_init_ahash_using_shash(struct crypto_tfm *tfm)
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{
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struct crypto_alg *calg = tfm->__crt_alg;
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struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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struct crypto_shash *shash;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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shash = crypto_create_tfm(calg, &crypto_shash_type);
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if (IS_ERR(shash)) {
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crypto_mod_put(calg);
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return PTR_ERR(shash);
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}
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crt->using_shash = true;
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*ctx = shash;
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tfm->exit = crypto_exit_ahash_using_shash;
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crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
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CRYPTO_TFM_NEED_KEY);
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crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
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return 0;
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}
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static int hash_walk_next(struct crypto_hash_walk *walk)
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{
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unsigned int offset = walk->offset;
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unsigned int nbytes = min(walk->entrylen,
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((unsigned int)(PAGE_SIZE)) - offset);
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walk->data = kmap_local_page(walk->pg);
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walk->data += offset;
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walk->entrylen -= nbytes;
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return nbytes;
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}
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static int hash_walk_new_entry(struct crypto_hash_walk *walk)
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{
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struct scatterlist *sg;
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sg = walk->sg;
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walk->offset = sg->offset;
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walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
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walk->offset = offset_in_page(walk->offset);
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walk->entrylen = sg->length;
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if (walk->entrylen > walk->total)
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walk->entrylen = walk->total;
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walk->total -= walk->entrylen;
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return hash_walk_next(walk);
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}
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int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
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{
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walk->data -= walk->offset;
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kunmap_local(walk->data);
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crypto_yield(walk->flags);
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if (err)
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return err;
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if (walk->entrylen) {
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walk->offset = 0;
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walk->pg++;
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return hash_walk_next(walk);
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}
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if (!walk->total)
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return 0;
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walk->sg = sg_next(walk->sg);
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
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int crypto_hash_walk_first(struct ahash_request *req,
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struct crypto_hash_walk *walk)
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{
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walk->total = req->nbytes;
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if (!walk->total) {
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walk->entrylen = 0;
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return 0;
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}
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walk->sg = req->src;
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walk->flags = req->base.flags;
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
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static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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return -ENOSYS;
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}
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static void ahash_set_needkey(struct crypto_ahash *tfm, struct ahash_alg *alg)
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{
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if (alg->setkey != ahash_nosetkey &&
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!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
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crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
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}
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int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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if (likely(tfm->using_shash)) {
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struct crypto_shash *shash = ahash_to_shash(tfm);
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int err;
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err = crypto_shash_setkey(shash, key, keylen);
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if (unlikely(err)) {
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crypto_ahash_set_flags(tfm,
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crypto_shash_get_flags(shash) &
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CRYPTO_TFM_NEED_KEY);
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return err;
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}
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} else {
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struct ahash_alg *alg = crypto_ahash_alg(tfm);
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int err;
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err = alg->setkey(tfm, key, keylen);
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if (unlikely(err)) {
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ahash_set_needkey(tfm, alg);
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return err;
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}
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}
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crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
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int crypto_ahash_init(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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if (likely(tfm->using_shash))
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return crypto_shash_init(prepare_shash_desc(req, tfm));
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if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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return -ENOKEY;
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return crypto_ahash_alg(tfm)->init(req);
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_init);
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static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
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bool has_state)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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unsigned int ds = crypto_ahash_digestsize(tfm);
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struct ahash_request *subreq;
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unsigned int subreq_size;
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unsigned int reqsize;
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u8 *result;
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gfp_t gfp;
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u32 flags;
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subreq_size = sizeof(*subreq);
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reqsize = crypto_ahash_reqsize(tfm);
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reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
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subreq_size += reqsize;
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subreq_size += ds;
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flags = ahash_request_flags(req);
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gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
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subreq = kmalloc(subreq_size, gfp);
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if (!subreq)
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return -ENOMEM;
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ahash_request_set_tfm(subreq, tfm);
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ahash_request_set_callback(subreq, flags, cplt, req);
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result = (u8 *)(subreq + 1) + reqsize;
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ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
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if (has_state) {
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void *state;
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state = kmalloc(crypto_ahash_statesize(tfm), gfp);
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if (!state) {
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kfree(subreq);
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return -ENOMEM;
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}
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crypto_ahash_export(req, state);
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crypto_ahash_import(subreq, state);
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kfree_sensitive(state);
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}
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req->priv = subreq;
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return 0;
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}
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static void ahash_restore_req(struct ahash_request *req, int err)
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{
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struct ahash_request *subreq = req->priv;
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if (!err)
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memcpy(req->result, subreq->result,
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crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
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req->priv = NULL;
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kfree_sensitive(subreq);
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}
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int crypto_ahash_update(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ahash_alg *alg;
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if (likely(tfm->using_shash))
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return shash_ahash_update(req, ahash_request_ctx(req));
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alg = crypto_ahash_alg(tfm);
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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atomic64_add(req->nbytes, &ahash_get_stat(alg)->hash_tlen);
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return crypto_ahash_errstat(alg, alg->update(req));
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_update);
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int crypto_ahash_final(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ahash_alg *alg;
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if (likely(tfm->using_shash))
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return crypto_shash_final(ahash_request_ctx(req), req->result);
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alg = crypto_ahash_alg(tfm);
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if (IS_ENABLED(CONFIG_CRYPTO_STATS))
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atomic64_inc(&ahash_get_stat(alg)->hash_cnt);
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return crypto_ahash_errstat(alg, alg->final(req));
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_final);
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int crypto_ahash_finup(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ahash_alg *alg;
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if (likely(tfm->using_shash))
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return shash_ahash_finup(req, ahash_request_ctx(req));
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alg = crypto_ahash_alg(tfm);
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if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
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struct crypto_istat_hash *istat = ahash_get_stat(alg);
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atomic64_inc(&istat->hash_cnt);
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atomic64_add(req->nbytes, &istat->hash_tlen);
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}
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return crypto_ahash_errstat(alg, alg->finup(req));
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_finup);
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int crypto_ahash_digest(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ahash_alg *alg;
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int err;
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if (likely(tfm->using_shash))
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return shash_ahash_digest(req, prepare_shash_desc(req, tfm));
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alg = crypto_ahash_alg(tfm);
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if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
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struct crypto_istat_hash *istat = ahash_get_stat(alg);
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atomic64_inc(&istat->hash_cnt);
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atomic64_add(req->nbytes, &istat->hash_tlen);
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}
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if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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err = -ENOKEY;
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else
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err = alg->digest(req);
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return crypto_ahash_errstat(alg, err);
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}
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EXPORT_SYMBOL_GPL(crypto_ahash_digest);
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static void ahash_def_finup_done2(void *data, int err)
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{
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struct ahash_request *areq = data;
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if (err == -EINPROGRESS)
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return;
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ahash_restore_req(areq, err);
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ahash_request_complete(areq, err);
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}
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static int ahash_def_finup_finish1(struct ahash_request *req, int err)
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{
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struct ahash_request *subreq = req->priv;
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if (err)
|
|
goto out;
|
|
|
|
subreq->base.complete = ahash_def_finup_done2;
|
|
|
|
err = crypto_ahash_alg(crypto_ahash_reqtfm(req))->final(subreq);
|
|
if (err == -EINPROGRESS || err == -EBUSY)
|
|
return err;
|
|
|
|
out:
|
|
ahash_restore_req(req, err);
|
|
return err;
|
|
}
|
|
|
|
static void ahash_def_finup_done1(void *data, int err)
|
|
{
|
|
struct ahash_request *areq = data;
|
|
struct ahash_request *subreq;
|
|
|
|
if (err == -EINPROGRESS)
|
|
goto out;
|
|
|
|
subreq = areq->priv;
|
|
subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
|
|
|
|
err = ahash_def_finup_finish1(areq, err);
|
|
if (err == -EINPROGRESS || err == -EBUSY)
|
|
return;
|
|
|
|
out:
|
|
ahash_request_complete(areq, err);
|
|
}
|
|
|
|
static int ahash_def_finup(struct ahash_request *req)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
int err;
|
|
|
|
err = ahash_save_req(req, ahash_def_finup_done1, true);
|
|
if (err)
|
|
return err;
|
|
|
|
err = crypto_ahash_alg(tfm)->update(req->priv);
|
|
if (err == -EINPROGRESS || err == -EBUSY)
|
|
return err;
|
|
|
|
return ahash_def_finup_finish1(req, err);
|
|
}
|
|
|
|
int crypto_ahash_export(struct ahash_request *req, void *out)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
|
|
if (likely(tfm->using_shash))
|
|
return crypto_shash_export(ahash_request_ctx(req), out);
|
|
return crypto_ahash_alg(tfm)->export(req, out);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_ahash_export);
|
|
|
|
int crypto_ahash_import(struct ahash_request *req, const void *in)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
|
|
if (likely(tfm->using_shash))
|
|
return crypto_shash_import(prepare_shash_desc(req, tfm), in);
|
|
if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
return crypto_ahash_alg(tfm)->import(req, in);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_ahash_import);
|
|
|
|
static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
|
|
struct ahash_alg *alg = crypto_ahash_alg(hash);
|
|
|
|
alg->exit_tfm(hash);
|
|
}
|
|
|
|
static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
|
|
struct ahash_alg *alg = crypto_ahash_alg(hash);
|
|
|
|
crypto_ahash_set_statesize(hash, alg->halg.statesize);
|
|
|
|
if (tfm->__crt_alg->cra_type == &crypto_shash_type)
|
|
return crypto_init_ahash_using_shash(tfm);
|
|
|
|
ahash_set_needkey(hash, alg);
|
|
|
|
if (alg->exit_tfm)
|
|
tfm->exit = crypto_ahash_exit_tfm;
|
|
|
|
return alg->init_tfm ? alg->init_tfm(hash) : 0;
|
|
}
|
|
|
|
static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
|
|
{
|
|
if (alg->cra_type == &crypto_shash_type)
|
|
return sizeof(struct crypto_shash *);
|
|
|
|
return crypto_alg_extsize(alg);
|
|
}
|
|
|
|
static void crypto_ahash_free_instance(struct crypto_instance *inst)
|
|
{
|
|
struct ahash_instance *ahash = ahash_instance(inst);
|
|
|
|
ahash->free(ahash);
|
|
}
|
|
|
|
static int __maybe_unused crypto_ahash_report(
|
|
struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
struct crypto_report_hash rhash;
|
|
|
|
memset(&rhash, 0, sizeof(rhash));
|
|
|
|
strscpy(rhash.type, "ahash", sizeof(rhash.type));
|
|
|
|
rhash.blocksize = alg->cra_blocksize;
|
|
rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
|
|
|
|
return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
|
|
}
|
|
|
|
static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
|
|
__maybe_unused;
|
|
static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
|
|
{
|
|
seq_printf(m, "type : ahash\n");
|
|
seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
|
|
"yes" : "no");
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
|
seq_printf(m, "digestsize : %u\n",
|
|
__crypto_hash_alg_common(alg)->digestsize);
|
|
}
|
|
|
|
static int __maybe_unused crypto_ahash_report_stat(
|
|
struct sk_buff *skb, struct crypto_alg *alg)
|
|
{
|
|
return crypto_hash_report_stat(skb, alg, "ahash");
|
|
}
|
|
|
|
static const struct crypto_type crypto_ahash_type = {
|
|
.extsize = crypto_ahash_extsize,
|
|
.init_tfm = crypto_ahash_init_tfm,
|
|
.free = crypto_ahash_free_instance,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_ahash_show,
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_CRYPTO_USER)
|
|
.report = crypto_ahash_report,
|
|
#endif
|
|
#ifdef CONFIG_CRYPTO_STATS
|
|
.report_stat = crypto_ahash_report_stat,
|
|
#endif
|
|
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
|
|
.maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
|
|
.type = CRYPTO_ALG_TYPE_AHASH,
|
|
.tfmsize = offsetof(struct crypto_ahash, base),
|
|
};
|
|
|
|
int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
|
|
struct crypto_instance *inst,
|
|
const char *name, u32 type, u32 mask)
|
|
{
|
|
spawn->base.frontend = &crypto_ahash_type;
|
|
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_grab_ahash);
|
|
|
|
struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
|
|
u32 mask)
|
|
{
|
|
return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
|
|
|
|
int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
|
|
{
|
|
return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_has_ahash);
|
|
|
|
struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
|
|
{
|
|
struct hash_alg_common *halg = crypto_hash_alg_common(hash);
|
|
struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
|
|
struct crypto_ahash *nhash;
|
|
struct ahash_alg *alg;
|
|
int err;
|
|
|
|
if (!crypto_hash_alg_has_setkey(halg)) {
|
|
tfm = crypto_tfm_get(tfm);
|
|
if (IS_ERR(tfm))
|
|
return ERR_CAST(tfm);
|
|
|
|
return hash;
|
|
}
|
|
|
|
nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
|
|
|
|
if (IS_ERR(nhash))
|
|
return nhash;
|
|
|
|
nhash->reqsize = hash->reqsize;
|
|
nhash->statesize = hash->statesize;
|
|
|
|
if (likely(hash->using_shash)) {
|
|
struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
|
|
struct crypto_shash *shash;
|
|
|
|
shash = crypto_clone_shash(ahash_to_shash(hash));
|
|
if (IS_ERR(shash)) {
|
|
err = PTR_ERR(shash);
|
|
goto out_free_nhash;
|
|
}
|
|
nhash->using_shash = true;
|
|
*nctx = shash;
|
|
return nhash;
|
|
}
|
|
|
|
err = -ENOSYS;
|
|
alg = crypto_ahash_alg(hash);
|
|
if (!alg->clone_tfm)
|
|
goto out_free_nhash;
|
|
|
|
err = alg->clone_tfm(nhash, hash);
|
|
if (err)
|
|
goto out_free_nhash;
|
|
|
|
return nhash;
|
|
|
|
out_free_nhash:
|
|
crypto_free_ahash(nhash);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_clone_ahash);
|
|
|
|
static int ahash_prepare_alg(struct ahash_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->halg.base;
|
|
int err;
|
|
|
|
if (alg->halg.statesize == 0)
|
|
return -EINVAL;
|
|
|
|
err = hash_prepare_alg(&alg->halg);
|
|
if (err)
|
|
return err;
|
|
|
|
base->cra_type = &crypto_ahash_type;
|
|
base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
|
|
|
|
if (!alg->finup)
|
|
alg->finup = ahash_def_finup;
|
|
if (!alg->setkey)
|
|
alg->setkey = ahash_nosetkey;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int crypto_register_ahash(struct ahash_alg *alg)
|
|
{
|
|
struct crypto_alg *base = &alg->halg.base;
|
|
int err;
|
|
|
|
err = ahash_prepare_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_alg(base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_ahash);
|
|
|
|
void crypto_unregister_ahash(struct ahash_alg *alg)
|
|
{
|
|
crypto_unregister_alg(&alg->halg.base);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
|
|
|
|
int crypto_register_ahashes(struct ahash_alg *algs, int count)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
ret = crypto_register_ahash(&algs[i]);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (--i; i >= 0; --i)
|
|
crypto_unregister_ahash(&algs[i]);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_ahashes);
|
|
|
|
void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = count - 1; i >= 0; --i)
|
|
crypto_unregister_ahash(&algs[i]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
|
|
|
|
int ahash_register_instance(struct crypto_template *tmpl,
|
|
struct ahash_instance *inst)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON(!inst->free))
|
|
return -EINVAL;
|
|
|
|
err = ahash_prepare_alg(&inst->alg);
|
|
if (err)
|
|
return err;
|
|
|
|
return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
|
|
}
|
|
EXPORT_SYMBOL_GPL(ahash_register_instance);
|
|
|
|
bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
|
|
{
|
|
struct crypto_alg *alg = &halg->base;
|
|
|
|
if (alg->cra_type == &crypto_shash_type)
|
|
return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
|
|
|
|
return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
|