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Add engine field to context structure

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For multi-part operations, we want to make the decision to use PSA or
not only once, during setup(), and remember it afterwards. This supports
the introduction, in the next few commits, of a dynamic component to
that decision: has the PSA driver sub-system been initialized yet?

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2023-03-09 10:46:22 +01:00
parent 12612e5ab4
commit d8ea37f1a3
2 changed files with 34 additions and 10 deletions
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17
include/mbedtls/md.h
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@ -180,6 +180,16 @@ typedef enum {
/* Defined internally in library/md_wrap.h. */
typedef struct mbedtls_md_info_t mbedtls_md_info_t;
/**
* Used internally to indicate whether a context uses legacy or PSA.
*
* Internal use only.
*/
typedef enum {
MBEDTLS_MD_ENGINE_LEGACY = 0,
MBEDTLS_MD_ENGINE_PSA,
} mbedtls_md_engine_t;
/**
* The generic message-digest context.
*/
@ -187,7 +197,12 @@ typedef struct mbedtls_md_context_t {
/** Information about the associated message digest. */
const mbedtls_md_info_t *MBEDTLS_PRIVATE(md_info);
/** The digest-specific context. */
#if defined(MBEDTLS_MD_SOME_PSA)
/** Are hash operations dispatched to PSA or legacy? */
mbedtls_md_engine_t MBEDTLS_PRIVATE(engine);
#endif
/** The digest-specific context (legacy) or the PSA operation. */
void *MBEDTLS_PRIVATE(md_ctx);
/** The HMAC part of the context. */