sha256_ethereum
Originally in: https://gist.github.com/kobigurk/24c25e68219df87c348f1a78db51bb52
This is a sha256 gadget for a specific use-case of hashing in a merkle tree, based on https://github.com/zcash/zcash
The code is licensed under the MIT license.
License notices:
ZCash
Copyright (c) 2016-2018 The Zcash developers Copyright (c) 2009-2018 The Bitcoin Core developers
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The MIT software license (http://www.opensource.org/licenses/mit-license.php) above applies to the code directly included in this source distribution. Dependencies downloaded as part of the build process may be covered by other open-source licenses. For further details see 'contrib/debian/copyright'.
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (https://www.openssl.org/). This product includes cryptographic software written by Eric Young (eay@cryptsoft.com).
Although almost all of the Zcash code is licensed under "permissive" open source licenses, users and distributors should note that when built using the default build options, Zcash depends on Oracle Berkeley DB 6.2.x, which is licensed under the GNU Affero General Public License.
libsnark
The libsnark library is developed by SCIPR Lab (http://scipr-lab.org) and contributors.
Copyright (c) 2012-2014 SCIPR Lab and contributors (see AUTHORS file).
All files, with the exceptions below, are released under the MIT License:
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.