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Document mutex invariant for CTR_DRBG

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-02-09 18:44:02 +01:00
parent 89816bc020
commit 2ecc0b89f3
2 changed files with 9 additions and 0 deletions
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7
include/mbedtls/ctr_drbg.h
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@ -214,6 +214,13 @@ typedef struct mbedtls_ctr_drbg_context
void *p_entropy; /*!< The context for the entropy function. */
#if defined(MBEDTLS_THREADING_C)
/* Invariant: the mutex is initialized if and only if f_entropy != NULL.
* This means that the mutex is initialized during the initial seeding
* in mbedtls_ctr_drbg_seed() and freed in mbedtls_ctr_drbg_free().
*
* Note that this invariant may change without notice. Do not rely on it
* and do not access the mutex directly in application code.
*/
mbedtls_threading_mutex_t mutex;
#endif
}