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Bug fix for cache attack

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This commit is contained in:
Jacob Barthelmeh
2016-12-19 14:51:42 -07:00
parent 168203ff9d
commit 345df93978
1 changed files with 3 additions and 4 deletions
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7
wolfcrypt/src/tfm.c
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@ -446,12 +446,11 @@ INLINE static void fp_mul_comba_mulx(fp_int *A, fp_int *B, fp_int *C)
pa = FP_SIZE-1;
}
if (A == C || B == C) {
/* Always take branch to use tmp variable. This avoids a cache attack for
* determining if C equals A */
if (1) {
fp_init(&tmp);
dst = &tmp;
} else {
fp_zero(C);
dst = C;
}
TFM_INTEL_MUL_COMBA(A, B, dst) ;