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Introduce a platform fault on bad input in uECC_vli_mmod

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Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek
2021-01-14 07:48:49 -05:00
parent 5ef12c0cbc
commit 7aebd7f55d
2 changed files with 17 additions and 3 deletions
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12
tinycrypt/ecc.c
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@@ -70,6 +70,12 @@
#include <string.h>
#include "mbedtls/platform_util.h"
#if defined(MBEDTLS_PLATFORM_FAULT_CALLBACKS)
#include "platform_fault.h"
#else
static void mbedtls_platform_fault(){}
#endif
#if defined MBEDTLS_OPTIMIZE_TINYCRYPT_ASM
#ifndef asm
#define asm __asm
@@ -1167,6 +1173,12 @@ void uECC_vli_mmod(uECC_word_t *result, uECC_word_t *product,
wordcount_t word_shift = shift / uECC_WORD_BITS;
wordcount_t bit_shift = shift % uECC_WORD_BITS;
uECC_word_t carry = 0;
if(word_shift > NUM_ECC_WORDS)
{
mbedtls_platform_fault();
}
uECC_vli_clear(mod_multiple);
if (bit_shift > 0) {
for(index = 0; index < (uECC_word_t)num_words; ++index) {