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Add flow control in uECC_vli_equal loop

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Manuel Pégourié-Gonnard 2019-11-27 11:57:49 +01:00
parent 9d6a535ba1
commit 98e1fe0796
1 changed files with 6 additions and 1 deletions
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7
tinycrypt/ecc.c
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@ -278,11 +278,16 @@ uECC_word_t uECC_vli_equal(const uECC_word_t *left, const uECC_word_t *right)
{ {
uECC_word_t diff = 0; uECC_word_t diff = 0;
wordcount_t i; volatile int i;
for (i = NUM_ECC_WORDS - 1; i >= 0; --i) { for (i = NUM_ECC_WORDS - 1; i >= 0; --i) {
diff |= (left[i] ^ right[i]); diff |= (left[i] ^ right[i]);
} }
/* i should be -1 now */
mbedtls_platform_enforce_volatile_reads();
diff |= i ^ -1;
return diff; return diff;
} }