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XMSS: Fix index copy for signing.

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The index is already big-endian encoded but it needs to be front padded
with zeros instead of back end padded.
This commit is contained in:
Sean Parkinson
2026-03-16 21:24:08 +10:00
parent a6195c30c1
commit 9590255ceb
1 changed files with 3 additions and 4 deletions
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wolfcrypt/src/wc_xmss_impl.c
+3 -4
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@@ -413,8 +413,7 @@ static void wc_idx_update(unsigned char* a, word8 l)
/* Copy index from source buffer to destination buffer.
*
* Index is put into the front of the destination buffer with the length of the
* source.
* Index is put in the back of the destination buffer.
*
* @param [in] s Source buffer.
* @param [in] sl Length of index in source.
@@ -424,8 +423,8 @@ static void wc_idx_update(unsigned char* a, word8 l)
static void wc_idx_copy(const unsigned char* s, word8 sl, unsigned char* d,
word8 dl)
{
XMEMCPY(d, s, sl);
XMEMSET(d + sl, 0, dl - sl);
XMEMSET(d, 0, dl - sl);
XMEMCPY(d + dl - sl, s, sl);
}
#endif