Changes as per sphincs/sphincsplus#51

blakehartin · Nov 25, 2023 · 0589422 · 0589422
1 parent 462b368
commit 0589422
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/sphincs/fors.c b/sphincs/fors.c
@@ -53,7 +53,7 @@ static void message_to_indices(uint32_t *indices, const unsigned char *m) {
     for (i = 0; i < SPX_FORS_TREES; i++) {
         indices[i] = 0;
         for (j = 0; j < SPX_FORS_HEIGHT; j++) {
-            indices[i] ^= (uint32_t)(((m[offset >> 3] >> (offset & 0x7)) & 0x1) << j);
+            indices[i] ^= ((m[offset >> 3] >> (~offset & 0x7)) & 0x1) << (SPX_FORS_HEIGHT-1-j);
             offset++;
         }
     }