aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/utils/encrypt_file.cpp
blob: 8741f54d2a057947b028664a362bb4a7e3cfd2dd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "AES tools" project.
// For details, see https://github.com/egor-tensin/aes-tools.
// Distributed under the MIT License.

#include "file_cmd_parser.hpp"

#include <aesxx/all.hpp>

#include <boost/program_options.hpp>

#include <cstdlib>

#include <exception>
#include <fstream>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>

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> plaintext_buf;
        plaintext_buf.reserve(size);
        plaintext_buf.assign(
            std::istreambuf_iterator<char>(ifs),
            std::istreambuf_iterator<char>());
        return plaintext_buf;
    }

    void write_file(
        const std::string& path,
        const std::vector<unsigned char>& src)
    {
        std::ofstream ofs;
        ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
        ofs.open(path, std::ofstream::binary);
        ofs.write(reinterpret_cast<const char*>(src.data()), src.size());
    }

    void encrypt_file(
        aes::Box& box,
        const std::string& plaintext_path,
        const std::string& ciphertext_path)
    {
        const auto plaintext_buf = read_file(plaintext_path);
        const auto ciphertext_buf = box.encrypt_buffer(
            plaintext_buf.data(), plaintext_buf.size());
        write_file(ciphertext_path, ciphertext_buf);
    }

    void encrypt_file(const Settings& settings)
    {
        const auto algorithm = settings.get_algorithm();
        const auto mode = settings.get_mode();

        const auto& plaintext_path = settings.get_input_path();
        const auto& ciphertext_path = settings.get_output_path();

        aes::Box::Key key;
        aes::Box::parse_key(key, algorithm, settings.get_key_string());

        if (aes::mode_requires_initialization_vector(mode))
        {
            aes::Box::Block iv;
            aes::Box::parse_block(iv, algorithm, settings.get_iv_string());
            aes::Box box{ algorithm, key, mode, iv };

            encrypt_file(box, plaintext_path, ciphertext_path);
        }
        else
        {
            aes::Box box{ algorithm, key };
            encrypt_file(box, plaintext_path, ciphertext_path);
        }
    }
}

int main(int argc, char** argv)
{
    try
    {
        CommandLineParser cmd_parser(argv[0]);
        try
        {
            Settings settings;
            cmd_parser.parse(settings, argc, argv);

            if (cmd_parser.exit_with_usage())
            {
                std::cout << cmd_parser;
                return 0;
            }

            encrypt_file(settings);
        }
        catch (const boost::program_options::error& e)
        {
            std::cerr << "Usage error: " << e.what() << "\n";
            std::cerr << cmd_parser;
            return 1;
        }
        catch (const aes::Error& e)
        {
            std::cerr << e;
            return 1;
        }
    }
    catch (const std::exception& e)
    {
        std::cerr << e.what() << "\n";
        return 1;
    }
    return 0;
}