lilliput-ae-reference-implementation

commit c30548a179dcd0999bd342b10eeaad2a1a304e90
parent 52abee4e2d33c1bd7805e8c917e0def94045ebd1
Author: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date:   Wed, 21 Nov 2018 18:00:22 +0100

Implémentation de la permutation

Toujours conforme au vecteur de test ! Le test passe, du coup.

J'ai un doute sur la gestion des indices de π, ceci dit.

Diffstat:
M
crypto_aead/lilliputaei128v1/ref/cipher.c
 | 
12
++++++++++++

1 file changed, 12 insertions(+), 0 deletions(-)
diff --git a/crypto_aead/lilliputaei128v1/ref/cipher.c b/crypto_aead/lilliputaei128v1/ref/cipher.c
@@ -130,7 +130,19 @@ static void _permutation_layer(cipher_state *X, permutation p)
     {
         return;
     }
+
     debug_dump_buffer(X->debug, "     Permutation Layer :", sizeof(X->X), X->X, 10);
+
+    uint8_t X_old[BLOCK_BYTES];
+    memcpy(X_old, X, sizeof(X_old));
+
+    const uint8_t *pi = PERMUTATIONS[p];
+
+    for (size_t j=0; j<BLOCK_BYTES; j++)
+    {
+        X->X[pi[j]] = X_old[j];
+    }
+
     debug_dump_buffer(X->debug, "          State permuted :", sizeof(X->X), X->X, 10);
 }