[ot] hw/opentitan: ot_present: fix ot_present_decrypt

luismarques · AlexJones0 · commit 508a0ead2bba · 2025-10-22T20:43:18.000+01:00
Signed-off-by: Luís Marques &lt;luismarques@lowrisc.org&gt;
diff --git a/hw/opentitan/ot_present.c b/hw/opentitan/ot_present.c
@@ -217,8 +217,8 @@ void ot_present_decrypt(const OtPresentState *ps, uint64_t src, uint64_t *dst)
 
     for (unsigned round = OT_PRESENT_ROUND - 1u; round > 0; round--) {
         state = add_round_key(state, ps->keys[round]);
-        state = sbox_inv_layer(state);
         state = perm_inv_layer(state);
+        state = sbox_inv_layer(state);
     }
     state = add_round_key(state, ps->keys[0]);
 

Original file line number	Diff line number	Diff line change
`@@ -217,8 +217,8 @@ void ot_present_decrypt(const OtPresentState ps, uint64_t src, uint64_t dst)`
`217`	`217`
`218`	`218`	`for (unsigned round = OT_PRESENT_ROUND - 1u; round > 0; round--) {`
`219`	`219`	`state = add_round_key(state, ps->keys[round]);`
`220`		`- state = sbox_inv_layer(state);`
`221`	`220`	`state = perm_inv_layer(state);`
	`221`	`+ state = sbox_inv_layer(state);`
`222`	`222`	`}`
`223`	`223`	`state = add_round_key(state, ps->keys[0]);`
`224`	`224`