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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2025-04-12 18:57:19 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2025-04-16 15:36:24 +0800 |
| commit | 04bfa4c7d5119ca38f8133bfdae7957a60c8b221 (patch) | |
| tree | 70c6700d83b01fdd8f40f017cc5d7f126d88ef8c /include/crypto/internal | |
| parent | crypto: shash - Remove dynamic descsize (diff) | |
| download | linux-04bfa4c7d5119ca38f8133bfdae7957a60c8b221.tar.gz linux-04bfa4c7d5119ca38f8133bfdae7957a60c8b221.zip | |
crypto: hash - Add HASH_REQUEST_ON_STACK
Allow any ahash to be used with a stack request, with optional
dynamic allocation when async is needed. The intended usage is:
HASH_REQUEST_ON_STACK(req, tfm);
...
err = crypto_ahash_digest(req);
/* The request cannot complete synchronously. */
if (err == -EAGAIN) {
/* This will not fail. */
req = HASH_REQUEST_CLONE(req, gfp);
/* Redo operation. */
err = crypto_ahash_digest(req);
}
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/internal')
| -rw-r--r-- | include/crypto/internal/hash.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h index e2a1fac38610..45c728ac2621 100644 --- a/include/crypto/internal/hash.h +++ b/include/crypto/internal/hash.h @@ -11,6 +11,12 @@ #include <crypto/algapi.h> #include <crypto/hash.h> +#define HASH_FBREQ_ON_STACK(name, req) \ + char __##name##_req[sizeof(struct ahash_request) + \ + MAX_SYNC_HASH_REQSIZE] CRYPTO_MINALIGN_ATTR; \ + struct ahash_request *name = ahash_fbreq_on_stack_init( \ + __##name##_req, (req)) + struct ahash_request; struct ahash_instance { @@ -187,7 +193,7 @@ static inline void ahash_request_complete(struct ahash_request *req, int err) static inline u32 ahash_request_flags(struct ahash_request *req) { - return req->base.flags; + return crypto_request_flags(&req->base) & ~CRYPTO_AHASH_REQ_PRIVATE; } static inline struct crypto_ahash *crypto_spawn_ahash( @@ -257,5 +263,23 @@ static inline bool crypto_ahash_req_chain(struct crypto_ahash *tfm) return crypto_tfm_req_chain(&tfm->base); } +static inline struct ahash_request *ahash_fbreq_on_stack_init( + char *buf, struct ahash_request *old) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(old); + struct ahash_request *req = (void *)buf; + + ahash_request_set_tfm(req, tfm->fb); + req->base.flags = CRYPTO_TFM_REQ_ON_STACK; + ahash_request_set_callback(req, ahash_request_flags(old), NULL, NULL); + req->base.flags &= ~CRYPTO_AHASH_REQ_PRIVATE; + req->base.flags |= old->base.flags & CRYPTO_AHASH_REQ_PRIVATE; + req->src = old->src; + req->result = old->result; + req->nbytes = old->nbytes; + + return req; +} + #endif /* _CRYPTO_INTERNAL_HASH_H */ |