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Add error code MBEDTLS_ERR_PLATFORM_FAULT_DETECTED

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This can be used by Mbed TLS functions in any module to signal that a fault
attack is likely happening, so this can be appropriately handled by the
application (report, fall back to safer mode or even halt, etc.)
This commit is contained in:
Manuel Pégourié-Gonnard 2019-11-06 11:52:41 +01:00
parent e6d6f17738
commit 324c6e9cc9
3 changed files with 4 additions and 1 deletions
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2
include/mbedtls/error.h
View file

@ -86,7 +86,7 @@
* CHACHA20 3 0x0051-0x0055 * CHACHA20 3 0x0051-0x0055
* POLY1305 3 0x0057-0x005B * POLY1305 3 0x0057-0x005B
* CHACHAPOLY 2 0x0054-0x0056 * CHACHAPOLY 2 0x0054-0x0056
* PLATFORM 1 0x0070-0x0072 * PLATFORM 3 0x0070-0x0072 0x0071-0x0071
* *
* High-level module nr (3 bits - 0x0...-0x7...) * High-level module nr (3 bits - 0x0...-0x7...)
* Name ID Nr of Errors * Name ID Nr of Errors

1
include/mbedtls/platform.h
View file

@ -45,6 +45,7 @@
#define MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED -0x0070 /**< Hardware accelerator failed */ #define MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED -0x0070 /**< Hardware accelerator failed */
#define MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED -0x0072 /**< The requested feature is not supported by the platform */ #define MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED -0x0072 /**< The requested feature is not supported by the platform */
#define MBEDTLS_ERR_PLATFORM_FAULT_DETECTED -0x0071 /**< A fault was detected in a critical path, likely indicative of an active physical attack */
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {

2
library/error.c
View file

@ -841,6 +841,8 @@ void mbedtls_strerror( int ret, char *buf, size_t buflen )
mbedtls_snprintf( buf, buflen, "PLATFORM - Hardware accelerator failed" ); mbedtls_snprintf( buf, buflen, "PLATFORM - Hardware accelerator failed" );
if( use_ret == -(MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED) ) if( use_ret == -(MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED) )
mbedtls_snprintf( buf, buflen, "PLATFORM - The requested feature is not supported by the platform" ); mbedtls_snprintf( buf, buflen, "PLATFORM - The requested feature is not supported by the platform" );
if( use_ret == -(MBEDTLS_ERR_PLATFORM_FAULT_DETECTED) )
mbedtls_snprintf( buf, buflen, "PLATFORM - A fault was detected in a critical path, likely indicative of an active physical attack" );
#endif /* MBEDTLS_PLATFORM_C */ #endif /* MBEDTLS_PLATFORM_C */
#if defined(MBEDTLS_POLY1305_C) #if defined(MBEDTLS_POLY1305_C)