crypto: hash - Prevent use of req->result in ahash update
Prevent improper use of req->result field in ahash update, init, export and import functions in drivers code. A driver should use ahash request context if it needs to save internal state. Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -74,7 +74,8 @@ struct ahash_request {
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* @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the
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* state of the HASH transformation at the beginning. This shall fill in
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* the internal structures used during the entire duration of the whole
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* transformation. No data processing happens at this point.
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* transformation. No data processing happens at this point. Driver code
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* implementation must not use req->result.
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* @update: **[mandatory]** Push a chunk of data into the driver for transformation. This
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* function actually pushes blocks of data from upper layers into the
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* driver, which then passes those to the hardware as seen fit. This
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@ -83,7 +84,8 @@ struct ahash_request {
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* transformation. This function shall not modify the transformation
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* context, as this function may be called in parallel with the same
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* transformation object. Data processing can happen synchronously
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* [SHASH] or asynchronously [AHASH] at this point.
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* [SHASH] or asynchronously [AHASH] at this point. Driver must not use
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* req->result.
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* @final: **[mandatory]** Retrieve result from the driver. This function finalizes the
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* transformation and retrieves the resulting hash from the driver and
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* pushes it back to upper layers. No data processing happens at this
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@ -120,11 +122,12 @@ struct ahash_request {
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* you want to save partial result of the transformation after
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* processing certain amount of data and reload this partial result
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* multiple times later on for multiple re-use. No data processing
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* happens at this point.
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* happens at this point. Driver must not use req->result.
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* @import: Import partial state of the transformation. This function loads the
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* entire state of the ongoing transformation from a provided block of
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* data so the transformation can continue from this point onward. No
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* data processing happens at this point.
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* data processing happens at this point. Driver must not use
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* req->result.
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* @halg: see struct hash_alg_common
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*/
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struct ahash_alg {
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