xlnt/source/detail/cryptography/sha.cpp
2020-02-08 12:12:59 -05:00

110 lines
3.0 KiB
C++

// Copyright (c) 2017-2020 Thomas Fussell
//
// 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, WRISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE
//
// @license: http://www.opensource.org/licenses/mit-license.php
// @author: see AUTHORS file
#include <algorithm>
#include <array>
#include <cstring>
#include <iomanip>
#include <sstream>
#include <string>
#include <detail/cryptography/sha.hpp>
extern "C" {
extern void sha1_hash(const uint8_t *message, size_t len, uint32_t hash[5]);
extern void sha512_hash(const uint8_t *message, size_t len, uint64_t hash[8]);
}
namespace {
#ifdef _MSC_VER
inline std::uint32_t byteswap32(std::uint32_t i)
{
return _byteswap_ulong(i);
}
inline std::uint64_t byteswap64(std::uint64_t i)
{
return _byteswap_uint64(i);
}
#else
inline std::uint32_t byteswap32(std::uint32_t i)
{
return __builtin_bswap32(i);
}
inline std::uint64_t byteswap64(std::uint64_t i)
{
return __builtin_bswap64(i);
}
#endif
void byteswap(std::uint32_t *arr, std::size_t len)
{
for (auto i = std::size_t(0); i < len; ++i)
{
arr[i] = byteswap32(arr[i]);
}
}
void byteswap(std::uint64_t *arr, std::size_t len)
{
for (auto i = std::size_t(0); i < len; ++i)
{
arr[i] = byteswap64(arr[i]);
}
}
} // namespace
namespace xlnt {
namespace detail {
void sha1(const std::vector<std::uint8_t> &input, std::vector<std::uint8_t> &output)
{
static const auto sha1_bytes = 20;
output.resize(sha1_bytes);
auto output_pointer_u32 = reinterpret_cast<std::uint32_t *>(output.data());
sha1_hash(input.data(), input.size(), output_pointer_u32);
byteswap(output_pointer_u32, sha1_bytes / sizeof(std::uint32_t));
}
void sha512(const std::vector<std::uint8_t> &input, std::vector<std::uint8_t> &output)
{
static const auto sha512_bytes = 64;
output.resize(sha512_bytes);
auto output_pointer_u64 = reinterpret_cast<std::uint64_t *>(output.data());
sha512_hash(input.data(), input.size(), output_pointer_u64);
byteswap(output_pointer_u64, sha512_bytes / sizeof(std::uint64_t));
}
} // namespace detail
} // namespace xlnt