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This commit is contained in:
Sean Parkinson
2022-07-27 12:02:15 +10:00
parent 9c480ece66
commit 01aad13c38
3 changed files with 14 additions and 18 deletions
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11
wolfcrypt/src/misc.c
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@@ -545,14 +545,15 @@ WC_STATIC WC_INLINE byte ctSetLTE(int a, int b)
return (byte)(((word32)a - b - 1) >> 31);
}
/* Constant time - copy size bytes from left to dst if mask is set, size bytes
* from right to dst if mask is not set */
WC_STATIC WC_INLINE void ctMaskCopy(byte m, byte* dst, byte* left, byte* right,
/* Constant time - conditionally copy size bytes from src to dst if mask is set
*/
WC_STATIC WC_INLINE void ctMaskCopy(byte mask, byte* dst, byte* src,
word16 size)
{
int i;
for (i = 0; i < size; ++i)
dst[i] = ctMaskSel(m, left[i], right[i]);
for (i = 0; i < size; ++i) {
dst[i] ^= (dst[i] ^ src[i]) & mask;
}
}
#endif