1 files changed, 27 insertions, 0 deletions
diff --git a/crypto_aead/lilliputaei128v1/ref/tweakey.c b/crypto_aead/lilliputaei128v1/ref/tweakey.c
index 173f4be..d7a5805 100644
--- a/crypto_aead/lilliputaei128v1/ref/tweakey.c
+++ b/crypto_aead/lilliputaei128v1/ref/tweakey.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <inttypes.h>           /* debug */
 
+#include "constants.h"
 #include "tweakey.h"
 
 
@@ -73,12 +74,38 @@ void tweakey_state_extract(
 }
 
 
+static void _permute_state(tweakey_state *TK)
+{
+    uint8_t TK_old[TWEAKEY_BYTES];
+    memcpy(TK_old, TK->TK, sizeof(TK_old));
+
+    /* TODO: homogenize indices; here j=lane; k=byte */
+
+    for (size_t j=0; j<TWEAKEY_BYTES; j+=LANE_BYTES)
+    {
+        for (size_t k=0; k<LANE_BYTES; k++)
+        {
+            TK->TK[j+k] = TK_old[j+h[k]];
+        }
+    }
+}
+
+static void _multiply_state(__attribute__((unused)) tweakey_state *TK)
+{
+}
+
 void tweakey_state_update(tweakey_state *TK)
 {
     fprintf(TK->debug, "          Input Tweakey :\n");
     _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
+
+    _permute_state(TK);
+
     fprintf(TK->debug, "          Post permutation Tweakey :\n");
     _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
+
+    _multiply_state(TK);
+
     fprintf(TK->debug, "          Post multiplication Tweakey :\n");
     _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
 }