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Document mbedtls_psa_external_random_context_t

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Note that the implementation here is just a sample, and integrators
are expected to replace it with whatever they need.

But do try to supply a definition that can be somewhat useful (give
room for pointer+size).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-11-18 15:33:33 +01:00
parent b663a60140
commit c0963010c0
1 changed files with 10 additions and 1 deletions
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11
include/psa/crypto_platform.h
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@ -82,8 +82,17 @@ static inline int mbedtls_key_owner_id_equal( mbedtls_key_owner_id_t id1,
#endif /* MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER */
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
/** The type of contexts passed to mbedtls_psa_external_get_random().
*
* Mbed TLS initializes the context to all-bits-zero before calling
* mbedtls_psa_external_get_random() for the first time.
*
* The definition of this type in the Mbed TLS source code is for
* demonstration purposes. Implementers of mbedtls_psa_external_get_random()
* are expected to replace it with a custom definition.
*/
typedef struct {
uint8_t opaque[32];
uintptr_t opaque[2];
} mbedtls_psa_external_random_context_t;
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */