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Document mutex invariant for HMAC_DRBG

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-02-09 18:43:33 +01:00
parent b791dc66ce
commit e39b2192e5
2 changed files with 10 additions and 0 deletions
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2
library/hmac_drbg.c
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@ -254,6 +254,7 @@ int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
return( ret );
/* The mutex is initialized iff the md context is set up. */
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_init( &ctx->mutex );
#endif
@ -425,6 +426,7 @@ void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
return;
#if defined(MBEDTLS_THREADING_C)
/* The mutex is initialized iff the md context is set up. */
if( ctx->md_ctx.md_info != NULL )
mbedtls_mutex_free( &ctx->mutex );
#endif