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crypto: sahara - avoid needlessly saving and restoring sahara_ctx 

Based on commit 434b421241 ("crypto: caam - avoid needlessly saving and
restoring caam_hash_ctx") from Russell King.

When exporting and importing the hash state, we will only export and
import into hashes which share the same struct crypto_ahash pointer.
(See hash_accept->af_alg_accept->hash_accept_parent.)

This means that saving the sahara_ctx structure on export, and
restoring it on import is a waste of resources.  So, remove this code.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Fabio Estevam 2016-02-03 10:46:51 -02:00 committed by Herbert Xu
parent 6e56201857
commit bceab44eed
1 changed files with 2 additions and 10 deletions
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12
drivers/crypto/sahara.c
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@ -1162,26 +1162,18 @@ static int sahara_sha_digest(struct ahash_request *req)
static int sahara_sha_export(struct ahash_request *req, void *out)
{
struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
struct sahara_ctx *ctx = crypto_ahash_ctx(ahash);
struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
memcpy(out, ctx, sizeof(struct sahara_ctx));
memcpy(out + sizeof(struct sahara_sha_reqctx), rctx,
sizeof(struct sahara_sha_reqctx));
memcpy(out, rctx, sizeof(struct sahara_sha_reqctx));
return 0;
}
static int sahara_sha_import(struct ahash_request *req, const void *in)
{
struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
struct sahara_ctx *ctx = crypto_ahash_ctx(ahash);
struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
memcpy(ctx, in, sizeof(struct sahara_ctx));
memcpy(rctx, in + sizeof(struct sahara_sha_reqctx),
sizeof(struct sahara_sha_reqctx));
memcpy(rctx, in, sizeof(struct sahara_sha_reqctx));
return 0;
}