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Add macro for error code addition

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Adds a macro (`MBEDTLS_ERR_ADD`) to add error codes together and check that the
result will not be corrupted. This additional check is only enabled during
testing when `MBEDTLS_TEST_HOOKS` is defined.

Also includes a reference usage example in `rsa.c` where two high-level error
codes could be incorrectly added together under the right conditions. This now
ensures that when this error occurs during testing it will be correctly
reported.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
This commit is contained in:
Chris Jones 2021-01-08 17:04:59 +00:00
parent 528b0a6b18
commit 96ae73b0ea
6 changed files with 49 additions and 1 deletions
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7
library/error.c
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@ -210,6 +210,13 @@
#include "mbedtls/xtea.h"
#endif
#if defined(MBEDTLS_TEST_HOOKS)
int mbedtls_err_add( int high, int low, const char *file, int line ) {
if( mbedtls_test_err_add_hook != NULL )
(*mbedtls_test_err_add_hook)( high, low, file, line );
return ( high + low );
}
#endif
const char * mbedtls_high_level_strerr( int error_code )
{