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Explain that lifetime=0 from static initialization means VOLATILE

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This commit is contained in:
Gilles Peskine 2019-06-26 11:50:04 +02:00
parent a8ade16ffd
commit 9717d107ca
1 changed files with 7 additions and 0 deletions
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7
library/psa_crypto_se.c
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@ -27,6 +27,7 @@
#if defined(MBEDTLS_PSA_CRYPTO_SE_C) #if defined(MBEDTLS_PSA_CRYPTO_SE_C)
#include <assert.h>
#include <string.h> #include <string.h>
#include "psa_crypto_se.h" #include "psa_crypto_se.h"
@ -47,6 +48,12 @@ psa_status_t psa_register_se_driver(
if( methods->hal_version != PSA_DRV_SE_HAL_VERSION ) if( methods->hal_version != PSA_DRV_SE_HAL_VERSION )
return( PSA_ERROR_NOT_SUPPORTED ); return( PSA_ERROR_NOT_SUPPORTED );
/* Driver table entries are 0-initialized. 0 is not a valid driver
* lifetime because it means a volatile key. */
#if defined(static_assert)
static_assert( PSA_KEY_LIFETIME_VOLATILE == 0,
"Secure element support requires 0 to mean a volatile key" );
#endif
if( lifetime == PSA_KEY_LIFETIME_VOLATILE || if( lifetime == PSA_KEY_LIFETIME_VOLATILE ||
lifetime == PSA_KEY_LIFETIME_PERSISTENT ) lifetime == PSA_KEY_LIFETIME_PERSISTENT )
{ {