Alessandro Bonazzi
8c43d5cf2f
Files correlati : cg0.exe cg0700a.msk cg0700b.msk cg3.exe cg4.exe Bug : Commento: Merge 1.0 libraries
98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
/*
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* decrypt.cpp
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*
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* Copyright (c) 2014, Danilo Treffiletti <urban82@gmail.com>
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* All rights reserved.
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*
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* This file is part of Aes256.
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*
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* Aes256 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 2.1
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* of the License, or (at your option) any later version.
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*
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* Aes256 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Aes256.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "aes256.hpp"
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#define BUFFER_SIZE 1024*1024
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#ifdef __APPLE__
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# define fseeko64 fseeko
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#endif
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int main(int argc, char **argv)
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{
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ByteArray key, dec;
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size_t file_len;
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FILE *input, *output;
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srand(time(0));
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if (argc != 4) {
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fprintf(stderr, "Missing arguments\n");
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fprintf(stderr, "Usage: %s <key> <input file> <output file>\n", argv[0]);
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return 1;
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}
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size_t key_len = 0;
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while(argv[1][key_len] != 0)
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key.push_back(argv[1][key_len++]);
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input = fopen(argv[2], "rb");
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if (input == 0) {
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fprintf(stderr, "Cannot read file '%s'\n", argv[2]);
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return 1;
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}
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output = fopen(argv[3], "wb");
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if (output == 0) {
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fprintf(stderr, "Cannot write file '%s'\n", argv[3]);
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return 1;
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}
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Aes256 aes(key);
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fseeko64(input, 0, SEEK_END);
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file_len = ftell(input);
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fseeko64(input, 0, SEEK_SET);
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printf("File is %zd bytes\n", file_len);
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aes.decrypt_start(file_len);
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while (!feof(input)) {
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unsigned char buffer[BUFFER_SIZE];
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size_t buffer_len;
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buffer_len = fread(buffer, 1, BUFFER_SIZE, input);
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printf("Read %zd bytes\n", buffer_len);
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if (buffer_len > 0) {
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dec.clear();
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aes.decrypt_continue(buffer, buffer_len, dec);
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fwrite(dec.data(), dec.size(), 1, output);
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}
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}
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dec.clear();
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aes.decrypt_end(dec);
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fwrite(dec.data(), dec.size(), 1, output);
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fclose(input);
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fclose(output);
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return 0;
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}
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