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crypto: ahash - Add support for drivers with no fallback 

Some drivers cannot have a fallback, e.g., because the key is held
in hardware.  Allow these to be used with ahash by adding the bit
CRYPTO_ALG_NO_FALLBACK.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Harald Freudenberger <freude@linux.ibm.com>
This commit is contained in:
Herbert Xu 2025-06-04 17:54:41 +08:00
parent 40a98e702b
commit 4ccd065a69
2 changed files with 12 additions and 1 deletions
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10
crypto/ahash.c
View File

@ -347,6 +347,9 @@ static int ahash_do_req_chain(struct ahash_request *req,
if (crypto_ahash_statesize(tfm) > HASH_MAX_STATESIZE)
return -ENOSYS;
if (!crypto_ahash_need_fallback(tfm))
return -ENOSYS;
{
u8 state[HASH_MAX_STATESIZE];
@ -952,6 +955,10 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
base->cra_reqsize > MAX_SYNC_HASH_REQSIZE)
return -EINVAL;
if (base->cra_flags & CRYPTO_ALG_NEED_FALLBACK &&
base->cra_flags & CRYPTO_ALG_NO_FALLBACK)
return -EINVAL;
err = hash_prepare_alg(&alg->halg);
if (err)
return err;
@ -960,7 +967,8 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
if ((base->cra_flags ^ CRYPTO_ALG_REQ_VIRT) &
(CRYPTO_ALG_ASYNC | CRYPTO_ALG_REQ_VIRT))
(CRYPTO_ALG_ASYNC | CRYPTO_ALG_REQ_VIRT) &&
!(base->cra_flags & CRYPTO_ALG_NO_FALLBACK))
base->cra_flags |= CRYPTO_ALG_NEED_FALLBACK;
if (!alg->setkey)

3
include/linux/crypto.h
View File

@ -136,6 +136,9 @@
/* Set if the algorithm supports virtual addresses. */
#define CRYPTO_ALG_REQ_VIRT 0x00040000
/* Set if the algorithm cannot have a fallback (e.g., phmac). */
#define CRYPTO_ALG_NO_FALLBACK 0x00080000
/* The high bits 0xff000000 are reserved for type-specific flags. */
/*