lilliput-ae-reference-implementation

commit f92b969dc2b4ed8de7a3170c4b84ab06357e500c
parent dc8035fc0b4d12d999a053de90071143bcd9b12d
Author: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date:   Tue, 11 Dec 2018 17:18:52 +0100

Dépliage de la séquence induite par M₄ pour MR³

Diffstat:
M
src/tweakey.c
 | 
50
++++++++++++++++++++++++++++++++++++++++++++------

1 file changed, 44 insertions(+), 6 deletions(-)
diff --git a/src/tweakey.c b/src/tweakey.c
@@ -181,7 +181,42 @@ static const uint8_t M3[256] = {
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
+};
+
+static const uint8_t M4[256] = {
+    0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03,
+    0x04, 0x04, 0x05, 0x05, 0x06, 0x06, 0x07, 0x07,
+    0x08, 0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b,
+    0x0c, 0x0c, 0x0d, 0x0d, 0x0e, 0x0e, 0x0f, 0x0f,
+    0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13, 0x13,
+    0x14, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17,
+    0x18, 0x18, 0x19, 0x19, 0x1a, 0x1a, 0x1b, 0x1b,
+    0x1c, 0x1c, 0x1d, 0x1d, 0x1e, 0x1e, 0x1f, 0x1f,
+    0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03,
+    0x04, 0x04, 0x05, 0x05, 0x06, 0x06, 0x07, 0x07,
+    0x08, 0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b,
+    0x0c, 0x0c, 0x0d, 0x0d, 0x0e, 0x0e, 0x0f, 0x0f,
+    0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13, 0x13,
+    0x14, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17,
+    0x18, 0x18, 0x19, 0x19, 0x1a, 0x1a, 0x1b, 0x1b,
+    0x1c, 0x1c, 0x1d, 0x1d, 0x1e, 0x1e, 0x1f, 0x1f,
+    0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03,
+    0x04, 0x04, 0x05, 0x05, 0x06, 0x06, 0x07, 0x07,
+    0x08, 0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b,
+    0x0c, 0x0c, 0x0d, 0x0d, 0x0e, 0x0e, 0x0f, 0x0f,
+    0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13, 0x13,
+    0x14, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17,
+    0x18, 0x18, 0x19, 0x19, 0x1a, 0x1a, 0x1b, 0x1b,
+    0x1c, 0x1c, 0x1d, 0x1d, 0x1e, 0x1e, 0x1f, 0x1f,
+    0x00, 0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03,
+    0x04, 0x04, 0x05, 0x05, 0x06, 0x06, 0x07, 0x07,
+    0x08, 0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b,
+    0x0c, 0x0c, 0x0d, 0x0d, 0x0e, 0x0e, 0x0f, 0x0f,
+    0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13, 0x13,
+    0x14, 0x14, 0x15, 0x15, 0x16, 0x16, 0x17, 0x17,
+    0x18, 0x18, 0x19, 0x19, 0x1a, 0x1a, 0x1b, 0x1b,
+    0x1c, 0x1c, 0x1d, 0x1d, 0x1e, 0x1e, 0x1f, 0x1f
 };
 
 static void _multiply_MR(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
@@ -210,11 +245,14 @@ static void _multiply_MR2(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
 
 static void _multiply_MR3(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
 {
-    uint8_t tmp[LANE_BYTES];
-    memcpy(tmp, X, LANE_BYTES);
-
-    _multiply_MR2(X, tmp);
-    _multiply_MR(tmp, Y);
+    Y[0] = X[3]     ^ X[4]>>3;
+    Y[1] = X[4]     ^ X[5]>>3 ^ M3[X[6]];
+    Y[2] = M4[X[3]] ^ X[5]    ^ M1[X[6]] ^ M3[X[7]];
+    Y[3] = X[3]<<2  ^ X[6]    ^ X[7]<<3;
+    Y[4] = X[0]<<3  ^ X[4]<<2 ^ X[7];
+    Y[5] = X[0]     ^ X[5]<<2 ^ X[6]<<5;
+    Y[6] = X[1];
+    Y[7] = X[2];
 }
 
 typedef void (*matrix_multiplication)(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES]);