mirror of
https://github.com/qpdf/qpdf.git
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122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
#include <qpdf/Pl_AES_PDF.hh>
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#include <qpdf/Pl_StdioFile.hh>
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#include <qpdf/QIntC.hh>
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#include <qpdf/QUtil.hh>
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#include <iostream>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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static void
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usage()
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{
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std::cerr << "Usage: aes options hex-key infile outfile" << std::endl
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<< " -cbc -- disable CBC mode" << std::endl
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<< " +cbc -- enable CBC mode" << std::endl
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<< " -encrypt -- encrypt" << std::endl
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<< " -decrypt -- decrypt CBC mode" << std::endl
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<< " -zero-iv -- use zero initialization vector" << std::endl
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<< " -static-iv -- use static initialization vector"
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<< std::endl
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<< " -no-padding -- disable padding" << std::endl
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<< "Options must precede key and file names." << std::endl;
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exit(2);
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}
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int
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main(int argc, char* argv[])
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{
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bool encrypt = true;
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bool cbc_mode = true;
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char* hexkey = nullptr;
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char* infilename = nullptr;
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char* outfilename = nullptr;
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bool zero_iv = false;
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bool static_iv = false;
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bool disable_padding = false;
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for (int i = 1; i < argc; ++i) {
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char* arg = argv[i];
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if ((arg[0] == '-') || (arg[0] == '+')) {
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if (strcmp(arg, "-cbc") == 0) {
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cbc_mode = false;
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} else if (strcmp(arg, "+cbc") == 0) {
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cbc_mode = true;
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} else if (strcmp(arg, "-decrypt") == 0) {
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encrypt = false;
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} else if (strcmp(arg, "-encrypt") == 0) {
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encrypt = true;
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} else if (strcmp(arg, "-zero-iv") == 0) {
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zero_iv = true;
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} else if (strcmp(arg, "-static-iv") == 0) {
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static_iv = true;
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} else if (strcmp(arg, "-no-padding") == 0) {
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disable_padding = true;
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} else {
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usage();
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}
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} else if (argc == i + 3) {
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hexkey = argv[i];
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infilename = argv[i + 1];
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outfilename = argv[i + 2];
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break;
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} else {
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usage();
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}
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}
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if (outfilename == nullptr) {
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usage();
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}
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unsigned int hexkeylen = QIntC::to_uint(strlen(hexkey));
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unsigned int keylen = hexkeylen / 2;
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FILE* infile = QUtil::safe_fopen(infilename, "rb");
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FILE* outfile = QUtil::safe_fopen(outfilename, "wb");
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auto* key = new unsigned char[keylen];
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for (unsigned int i = 0; i < strlen(hexkey); i += 2) {
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char t[3];
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t[0] = hexkey[i];
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t[1] = hexkey[i + 1];
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t[2] = '\0';
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long val = strtol(t, nullptr, 16);
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key[i / 2] = static_cast<unsigned char>(val);
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}
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auto* out = new Pl_StdioFile("stdout", outfile);
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auto* aes = new Pl_AES_PDF("aes_128_cbc", out, encrypt, key, keylen);
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delete[] key;
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key = nullptr;
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if (!cbc_mode) {
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aes->disableCBC();
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}
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if (zero_iv) {
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aes->useZeroIV();
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} else if (static_iv) {
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aes->useStaticIV();
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}
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if (disable_padding) {
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aes->disablePadding();
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}
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// 16 < buffer size, buffer_size is not a multiple of 8 for testing
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unsigned char buf[83];
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bool done = false;
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while (!done) {
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size_t len = fread(buf, 1, sizeof(buf), infile);
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if (len <= 0) {
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done = true;
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} else {
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aes->write(buf, len);
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}
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}
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aes->finish();
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delete aes;
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delete out;
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fclose(infile);
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fclose(outfile);
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return 0;
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}
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