linux-stable/crypto/hash.h
Herbert Xu ed3630b83e crypto: hash - Add crypto_clone_ahash/shash
This patch adds the helpers crypto_clone_ahash and crypto_clone_shash.
They are the hash-specific counterparts of crypto_clone_tfm.

This allows code paths that cannot otherwise allocate a hash tfm
object to do so.  Once a new tfm has been obtained its key could
then be changed without impacting other users.

Note that only algorithms that implement clone_tfm can be cloned.
However, all keyless hashes can be cloned by simply reusing the
tfm object.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2023-04-20 18:20:04 +08:00

40 lines
1.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Cryptographic API.
*
* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
*/
#ifndef _LOCAL_CRYPTO_HASH_H
#define _LOCAL_CRYPTO_HASH_H
#include <crypto/internal/hash.h>
#include <linux/cryptouser.h>
#include "internal.h"
static inline int crypto_hash_report_stat(struct sk_buff *skb,
struct crypto_alg *alg,
const char *type)
{
struct hash_alg_common *halg = __crypto_hash_alg_common(alg);
struct crypto_istat_hash *istat = hash_get_stat(halg);
struct crypto_stat_hash rhash;
memset(&rhash, 0, sizeof(rhash));
strscpy(rhash.type, type, sizeof(rhash.type));
rhash.stat_hash_cnt = atomic64_read(&istat->hash_cnt);
rhash.stat_hash_tlen = atomic64_read(&istat->hash_tlen);
rhash.stat_err_cnt = atomic64_read(&istat->err_cnt);
return nla_put(skb, CRYPTOCFGA_STAT_HASH, sizeof(rhash), &rhash);
}
int crypto_init_shash_ops_async(struct crypto_tfm *tfm);
struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash,
struct crypto_ahash *hash);
int hash_prepare_alg(struct hash_alg_common *alg);
#endif /* _LOCAL_CRYPTO_HASH_H */