Add license to elligator script

diff --git a/tests/gen/elligator.py b/tests/gen/elligator.py
index 2158377a2e19dc8a64f5c9cb088b04d738074766..22df945668e0cadd5944a57cb402f4b2a7afbfff 100755 (executable)
--- a/tests/gen/elligator.py
+++ b/tests/gen/elligator.py
@@ -1,5 +1,56 @@
 #! /usr/bin/python3
 
+# This file is dual-licensed.  Choose whichever licence you want from
+# the two licences listed below.
+#
+# The first licence is a regular 2-clause BSD licence.  The second licence
+# is the CC-0 from Creative Commons. It is intended to release Monocypher
+# to the public domain.  The BSD licence serves as a fallback option.
+#
+# SPDX-License-Identifier: BSD-2-Clause OR CC0-1.0
+#
+# ------------------------------------------------------------------------
+#
+# Copyright (c) 2020, Loup Vaillant
+# All rights reserved.
+#
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# ------------------------------------------------------------------------
+#
+# Written in 2020 by Loup Vaillant
+#
+# To the extent possible under law, the author(s) have dedicated all copyright
+# and related neighboring rights to this software to the public domain
+# worldwide.  This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication along
+# with this software.  If not, see
+# <https://creativecommons.org/publicdomain/zero/1.0/>
+
 # Curve25519 constants
 p = 2**255 - 19 # prime field (note that p % 8 == 5)
 A = 486662