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