mirror of
https://github.com/eosswedenorg/libantelope
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75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/**
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* MIT License
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*
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* Copyright (c) 2019-2021 EOS Sw/eden
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef LIBEOSIO_CHECKSUM_H
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#define LIBEOSIO_CHECKSUM_H
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#include <cstdint>
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#include <cstring>
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#include <array>
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#include <libeosio/hash.hpp>
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namespace libeosio {
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/**
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* Checksum size (in bytes)
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*/
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#define CHECKSUM_SIZE 4
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/**
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* Checksum datatype
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*/
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typedef std::array<unsigned char, CHECKSUM_SIZE> checksum_t;
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/**
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* Checksum template function.
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* Template arguments:
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* - T: Hash type.
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* - F: Hash calculation function, should have the signature `T* F(const unsigned char *, std::size_t, T*)`
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*/
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template <typename T, T* (*F)(const unsigned char *, std::size_t, T*)>
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inline checksum_t checksum(const unsigned char* data, std::size_t len) {
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checksum_t crc;
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T hash;
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F(data, len, &hash);
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std::memcpy(crc.data(), &hash, crc.size());
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return crc;
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}
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template <checksum_t (*F)(const unsigned char *, std::size_t)>
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inline bool checksum_validate(const unsigned char* data, std::size_t len) {
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checksum_t check = F(data, len - CHECKSUM_SIZE);
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return !memcmp(check.data(), data + (len - CHECKSUM_SIZE), CHECKSUM_SIZE);
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}
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/**
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* Checksum implementations.
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*/
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#define checksum_sha256 checksum<sha256_t, sha256>
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#define checksum_sha256d checksum<sha256_t, sha256d>
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#define checksum_ripemd160 checksum<ripemd160_t, ripemd160>
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} // namespace libeosio
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#endif /* LIBEOSIO_CHECKSUM_H */
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