pq-crystals · adrien-n · Dec 11, 2024
diff --git a/avx2/align.h b/avx2/align.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef ALIGN_H
 #define ALIGN_H
 

diff --git a/avx2/api.h b/avx2/api.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef API_H
 #define API_H
 

diff --git a/avx2/config.h b/avx2/config.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef CONFIG_H
 #define CONFIG_H
 

diff --git a/avx2/consts.c b/avx2/consts.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "consts.h"

diff --git a/avx2/consts.h b/avx2/consts.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef CONSTS_H
 #define CONSTS_H
 

diff --git a/avx2/fips202.h b/avx2/fips202.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef FIPS202_H
 #define FIPS202_H
 

diff --git a/avx2/fips202x4.c b/avx2/fips202x4.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stddef.h>
 #include <stdint.h>
 #include <immintrin.h>

diff --git a/avx2/fips202x4.h b/avx2/fips202x4.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef FIPS202X4_H
 #define FIPS202X4_H
 

diff --git a/avx2/invntt.S b/avx2/invntt.S
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include "consts.h"
 .include "shuffle.inc"
 

diff --git a/avx2/ntt.S b/avx2/ntt.S
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include "consts.h"
 .include "shuffle.inc"
 

diff --git a/avx2/ntt.h b/avx2/ntt.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef NTT_H
 #define NTT_H
 

diff --git a/avx2/pointwise.S b/avx2/pointwise.S
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include "params.h"
 #include "consts.h"
 

diff --git a/avx2/poly.c b/avx2/poly.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include <immintrin.h>
 #include <string.h>

diff --git a/avx2/poly.h b/avx2/poly.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef POLY_H
 #define POLY_H
 

diff --git a/avx2/polyvec.c b/avx2/polyvec.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "polyvec.h"

diff --git a/avx2/polyvec.h b/avx2/polyvec.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef POLYVEC_H
 #define POLYVEC_H
 

diff --git a/avx2/rejsample.c b/avx2/rejsample.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include <immintrin.h>
 #include "params.h"

diff --git a/avx2/rejsample.h b/avx2/rejsample.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef REJSAMPLE_H
 #define REJSAMPLE_H
 

diff --git a/avx2/rounding.c b/avx2/rounding.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include <immintrin.h>
 #include <string.h>

diff --git a/avx2/rounding.h b/avx2/rounding.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef ROUNDING_H
 #define ROUNDING_H
 

diff --git a/avx2/shuffle.S b/avx2/shuffle.S
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include "consts.h"
 .include "shuffle.inc"
 

diff --git a/avx2/shuffle.inc b/avx2/shuffle.inc
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 .macro shuffle8 r0,r1,r2,r3
 vperm2i128	$0x20,%ymm\r1,%ymm\r0,%ymm\r2
 vperm2i128	$0x31,%ymm\r1,%ymm\r0,%ymm\r3

diff --git a/avx2/sign.c b/avx2/sign.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include <string.h>
 #include "align.h"

diff --git a/avx2/symmetric.h b/avx2/symmetric.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef SYMMETRIC_H
 #define SYMMETRIC_H
 

diff --git a/avx2/test/test_vectors.c b/avx2/test/test_vectors.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>

diff --git a/ref/api.h b/ref/api.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef API_H
 #define API_H
 

diff --git a/ref/config.h b/ref/config.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef CONFIG_H
 #define CONFIG_H
 

diff --git a/ref/fips202.c b/ref/fips202.c
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé,
+ *            Ronny Van Keer (crypto_hash/keccakc512/simple/ from http://bench.cr.yp.to/supercop.html),
+ *            Gilles Van Assche, Daniel J. Bernstein, Peter Schwabe (TweetFips202)
+ * */
+
 /* Based on the public domain implementation in crypto_hash/keccakc512/simple/ from
  * http://bench.cr.yp.to/supercop.html by Ronny Van Keer and the public domain "TweetFips202"
  * implementation from https://twitter.com/tweetfips202 by Gilles Van Assche, Daniel J. Bernstein,

diff --git a/ref/fips202.h b/ref/fips202.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé,
+ *            Ronny Van Keer (crypto_hash/keccakc512/simple/ from http://bench.cr.yp.to/supercop.html),
+ *            Gilles Van Assche, Daniel J. Bernstein, Peter Schwabe (TweetFips202)
+ * */
+
 #ifndef FIPS202_H
 #define FIPS202_H
 

diff --git a/ref/ntt.c b/ref/ntt.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "ntt.h"

diff --git a/ref/ntt.h b/ref/ntt.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef NTT_H
 #define NTT_H
 

diff --git a/ref/packing.c b/ref/packing.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include "params.h"
 #include "packing.h"
 #include "polyvec.h"

diff --git a/ref/packing.h b/ref/packing.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef PACKING_H
 #define PACKING_H
 

diff --git a/ref/params.h b/ref/params.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef PARAMS_H
 #define PARAMS_H
 

diff --git a/ref/poly.c b/ref/poly.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "poly.h"

diff --git a/ref/poly.h b/ref/poly.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef POLY_H
 #define POLY_H
 

diff --git a/ref/polyvec.c b/ref/polyvec.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "polyvec.h"

diff --git a/ref/polyvec.h b/ref/polyvec.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef POLYVEC_H
 #define POLYVEC_H
 

diff --git a/ref/precomp.gp b/ref/precomp.gp
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 precomp() = {
   brv = [128, 64, 192, 32, 160, 96, 224, 16, 144, 80, 208, 48, 176, 112, 240, 8, 136, 72, 200, 40, 168, 104, 232, 24, 152, 88, 216, 56, 184, 120, 248, 4, 132, 68, 196, 36, 164, 100, 228, 20, 148, 84, 212, 52, 180, 116, 244, 12, 140, 76, 204, 44, 172, 108, 236, 28, 156, 92, 220, 60, 188, 124, 252, 2, 130, 66, 194, 34, 162, 98, 226, 18, 146, 82, 210, 50, 178, 114, 242, 10, 138, 74, 202, 42, 170, 106, 234, 26, 154, 90, 218, 58, 186, 122, 250, 6, 134, 70, 198, 38, 166, 102, 230, 22, 150, 86, 214, 54, 182, 118, 246, 14, 142, 78, 206, 46, 174, 110, 238, 30, 158, 94, 222, 62, 190, 126, 254, 1, 129, 65, 193, 33, 161, 97, 225, 17, 145, 81, 209, 49, 177, 113, 241, 9, 137, 73, 201, 41, 169, 105, 233, 25, 153, 89, 217, 57, 185, 121, 249, 5, 133, 69, 197, 37, 165, 101, 229, 21, 149, 85, 213, 53, 181, 117, 245, 13, 141, 77, 205, 45, 173, 109, 237, 29, 157, 93, 221, 61, 189, 125, 253, 3, 131, 67, 195, 35, 163, 99, 227, 19, 147, 83, 211, 51, 179, 115, 243, 11, 139, 75, 203, 43, 171, 107, 235, 27, 155, 91, 219, 59, 187, 123, 251, 7, 135, 71, 199, 39, 167, 103, 231, 23, 151, 87, 215, 55, 183, 119, 247, 15, 143, 79, 207, 47, 175, 111, 239, 31, 159, 95, 223, 63, 191, 127, 255];
 

diff --git a/ref/randombytes.c b/ref/randombytes.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>

diff --git a/ref/randombytes.h b/ref/randombytes.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef RANDOMBYTES_H
 #define RANDOMBYTES_H
 

diff --git a/ref/reduce.c b/ref/reduce.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "reduce.h"

diff --git a/ref/reduce.h b/ref/reduce.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef REDUCE_H
 #define REDUCE_H
 

diff --git a/ref/rounding.c b/ref/rounding.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "rounding.h"

diff --git a/ref/rounding.h b/ref/rounding.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef ROUNDING_H
 #define ROUNDING_H
 

diff --git a/ref/sign.c b/ref/sign.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "sign.h"

diff --git a/ref/sign.h b/ref/sign.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef SIGN_H
 #define SIGN_H
 

diff --git a/ref/symmetric-shake.c b/ref/symmetric-shake.c
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #include <stdint.h>
 #include "params.h"
 #include "symmetric.h"

diff --git a/ref/symmetric.h b/ref/symmetric.h
@@ -1,3 +1,7 @@
+/* SPDX-License-Identifier: Apache-2.0 OR CC0-1.0
+ * Copyright: Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, Gregor Seiler, Peter Schwabe, Damien Stehlé
+ * */
+
 #ifndef SYMMETRIC_H
 #define SYMMETRIC_H