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Clamp sakke_xor_in_v write to buffer length

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JeremiahM37
2026-05-07 22:19:53 -04:00
committed by Jeremiah Mackey
parent f1fff73352
commit f60f8cd965
1 changed files with 12 additions and 1 deletions
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wolfcrypt/src/sakke.c
+12 -1
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@@ -6164,18 +6164,29 @@ static void sakke_xor_in_v(const byte* v, word32 hashSz, byte* out, word32 idx,
{
int o;
word32 i;
word32 len;
if (idx == 0) {
i = hashSz - (n % hashSz);
if (i == hashSz) {
i = 0;
}
len = hashSz - i;
}
else {
i = 0;
/* Clamp to bytes still remaining in the caller's buffer. Without
* this clamp, the final iteration of sakke_hash_to_range (when
* n > hashSz and (n % hashSz) != 0) writes hashSz bytes at
* out+idx and overshoots the n-byte buffer by hashSz - (n%hashSz)
* bytes. */
len = (n > idx) ? (n - idx) : 0;
if (len > hashSz) {
len = hashSz;
}
}
o = (int)i;
xorbuf(out + idx + i - o, v + i, hashSz - i);
xorbuf(out + idx + i - o, v + i, len);
}
/*