riscv: aes: dual-license under Apache + 2-clause BSD

To allow re-use of the already reviewed openSSL crypto code for RISC-V in
other projects - like the Linux kernel, add a second license (2-clause BSD)
to the 32+64bit aes implementations using the Zkn extension.

Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/21018)

2 files changed, 54 insertions, 0 deletions

diff --git a/crypto/aes/asm/aes-riscv32-zkn.pl b/crypto/aes/asm/aes-riscv32-zkn.pl
index 7a20f66e5c..00d5d77359 100644
--- a/crypto/aes/asm/aes-riscv32-zkn.pl
+++ b/crypto/aes/asm/aes-riscv32-zkn.pl
@@ -6,6 +6,33 @@
 # in the file LICENSE in the source distribution or at
 # https://www.openssl.org/source/license.html
 
+# This file is dual-licensed and is also available under the following
+# terms:
+#
+# Copyright (c) 2022, Hongren (Zenithal) Zheng <i@zenithal.me>
+# 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
+# OWNER 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.
+
 # $output is the last argument if it looks like a file (it has an extension)
 # $flavour is the first argument if it doesn't look like a file
 $output = $#ARGV >= 0 && $ARGV[$#ARGV] =~ m|\.\w+$| ? pop : undef;
diff --git a/crypto/aes/asm/aes-riscv64-zkn.pl b/crypto/aes/asm/aes-riscv64-zkn.pl
index 89114b6223..5c68242751 100644
--- a/crypto/aes/asm/aes-riscv64-zkn.pl
+++ b/crypto/aes/asm/aes-riscv64-zkn.pl
@@ -6,6 +6,33 @@
 # in the file LICENSE in the source distribution or at
 # https://www.openssl.org/source/license.html
 
+# This file is dual-licensed and is also available under the following
+# terms:
+#
+# Copyright (c) 2022, Hongren (Zenithal) Zheng <i@zenithal.me>
+# 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
+# OWNER 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.
+
 use strict;
 use warnings;