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Merge pull request #10104 from padelsbach/cast-shift-slhdsa.c

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Cast to unsigned prior to shift to avoid UB in SLH-DSA
This commit is contained in:
Daniel Pouzzner
2026-04-02 00:03:42 -05:00
committed by GitHub
parent 27aac0ac60 4aac31bf09
commit 7fd41b13de
1 changed files with 2 additions and 2 deletions
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wolfcrypt/src/wc_slhdsa.c
+2 -2
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@@ -5768,7 +5768,7 @@ static void slhdsakey_set_ha_from_md(SlhDsaKey* key, const byte* md,
/* Step 9/12: Mask off any extra high bits. */
bits = key->params->h - (key->params->h / key->params->d);
if (bits < 64) {
t[1] &= (1 << (bits - 32)) - 1;
t[1] &= ((word32)1 << (bits - 32)) - 1;
}
/* Step 8/11: Get pointer to tree leaf index data. */
@@ -5777,7 +5777,7 @@ static void slhdsakey_set_ha_from_md(SlhDsaKey* key, const byte* md,
ato32(p, l);
/* Step 10/13: Mask off any extra high bits. */
bits = key->params->h / key->params->d;
*l &= (1 << bits) - 1;
*l &= ((word32)1 << bits) - 1;
/* Step 11/14: Set the tree index into address. */
HA_SetTreeAddress(adrs, t);