diff options
Diffstat (limited to 'utils/aes_decrypt_bmp.cpp')
-rw-r--r-- | utils/aes_decrypt_bmp.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/utils/aes_decrypt_bmp.cpp b/utils/aes_decrypt_bmp.cpp new file mode 100644 index 0000000..85dffe5 --- /dev/null +++ b/utils/aes_decrypt_bmp.cpp @@ -0,0 +1,191 @@ +/** + * \file + * \author Egor Tensin <Egor.Tensin@gmail.com> + * \date 2015 + * \copyright This file is licensed under the terms of the MIT License. + * See LICENSE.txt for details. + */ + +#include "aes_common.hpp" + +#include <aesni/all.h> + +#include <aesnixx/all.hpp> + +#include <boost/program_options.hpp> + +#include <cstdlib> +#include <cstring> + +#include <exception> +#include <fstream> +#include <iostream> +#include <string> +#include <utility> +#include <vector> + +#include <Windows.h> + +namespace +{ + std::ifstream::pos_type get_file_size(const std::string& path) + { + std::ifstream ifs; + ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit); + ifs.open(path, std::ifstream::binary | std::ifstream::ate); + return ifs.tellg(); + } + + std::vector<char> read_file(const std::string& path) + { + const auto size = static_cast<std::size_t>(get_file_size(path)); + + std::ifstream ifs; + ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit); + ifs.open(path, std::ifstream::binary); + + std::vector<char> src_buf; + src_buf.reserve(size); + src_buf.assign(std::istreambuf_iterator<char>(ifs), + std::istreambuf_iterator<char>()); + return src_buf; + } + + void write_file(const std::string& path, const std::vector<char>& src) + { + std::ofstream ofs; + ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit); + ofs.open(path, std::ofstream::binary); + ofs.write(src.data(), src.size()); + } +} + +int main(int argc, char** argv) +{ + try + { + CommandLineParser cmd_parser("aes_decrypt_bmp.exe"); + + if (!cmd_parser.parse_options(argc, argv)) + return 0; + + auto args = cmd_parser.get_args(); + + if (args.empty()) + { + cmd_parser.print_usage(); + return 1; + } + + AesNI_BoxAlgorithmParams algorithm_params; + + switch (cmd_parser.get_algorithm()) + { + case AESNI_AES128: + aesni::aes::from_string(algorithm_params.aes128_key, args.front()); + break; + + case AESNI_AES192: + aesni::aes::from_string(algorithm_params.aes192_key, args.front()); + break; + + case AESNI_AES256: + aesni::aes::from_string(algorithm_params.aes256_key, args.front()); + break; + } + + args.pop_front(); + + AesNI_BoxBlock iv; + AesNI_BoxBlock* iv_ptr = nullptr; + + switch (cmd_parser.get_mode()) + { + case AESNI_ECB: + break; + + case AESNI_CBC: + case AESNI_CFB: + case AESNI_OFB: + case AESNI_CTR: + if (args.empty()) + { + cmd_parser.print_usage(); + return 1; + } + aesni::aes::from_string(iv.aes_block, args.front()); + iv_ptr = &iv; + args.pop_front(); + break; + } + + if (args.size() != 2) + { + cmd_parser.print_usage(); + return 1; + } + + const auto src_path = args[0]; + const auto dest_path = args[1]; + + const auto src_buf = read_file(src_path); + + const auto bmp_header = reinterpret_cast<const BITMAPFILEHEADER*>(src_buf.data()); + + const auto header_size = bmp_header->bfOffBits; + const auto cipherpixels = src_buf.data() + header_size; + const auto cipherpixels_size = src_buf.size() - header_size; + + AesNI_Box box; + + aesni_box_init( + &box, + cmd_parser.get_algorithm(), + &algorithm_params, + cmd_parser.get_mode(), + iv_ptr, + aesni::ErrorDetailsThrowsInDestructor()); + + std::size_t pixels_size; + + aesni_box_decrypt_buffer( + &box, + cipherpixels, + cipherpixels_size, + nullptr, + &pixels_size, + aesni::ErrorDetailsThrowsInDestructor()); + + std::vector<char> dest_buf; + dest_buf.resize(header_size + pixels_size); + std::memcpy(dest_buf.data(), src_buf.data(), header_size); + + aesni_box_decrypt_buffer( + &box, + cipherpixels, + cipherpixels_size, + dest_buf.data() + header_size, + &pixels_size, + aesni::ErrorDetailsThrowsInDestructor()); + + dest_buf.resize(header_size + pixels_size); + write_file(dest_path, dest_buf); + + return 0; + } + catch (const boost::program_options::error& e) + { + std::cerr << "Usage error: " << e.what() << "\n"; + return 1; + } + catch (const aesni::Error& e) + { + std::cerr << e; + return 1; + } + catch (const std::exception& e) + { + std::cerr << e.what() << "\n"; + return 1; + } +} |