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Document mutex invariant for HMAC_DRBG
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -128,6 +128,14 @@ typedef struct
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void *p_entropy; /*!< context for the entropy function */
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#if defined(MBEDTLS_THREADING_C)
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/* Invariant: the mutex is initialized if and only if
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* md_ctx->md_info != NULL. This means that the mutex is initialized
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* during the initial seeding in mbedtls_hmac_drbg_seed() or
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* mbedtls_hmac_drbg_seed_buf() and freed in mbedtls_ctr_drbg_free().
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*
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* Note that this invariant may change without notice. Do not rely on it
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* and do not access the mutex directly in application code.
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*/
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mbedtls_threading_mutex_t mutex;
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#endif
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} mbedtls_hmac_drbg_context;
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@ -286,6 +286,7 @@ int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
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if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
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return( ret );
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/* The mutex is initialized iff the md context is set up. */
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#if defined(MBEDTLS_THREADING_C)
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mbedtls_mutex_init( &ctx->mutex );
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#endif
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@ -457,6 +458,7 @@ void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
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return;
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#if defined(MBEDTLS_THREADING_C)
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/* The mutex is initialized iff the md context is set up. */
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if( ctx->md_ctx.md_info != NULL )
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mbedtls_mutex_free( &ctx->mutex );
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#endif
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