AES_PDF_native.cc
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#include <qpdf/AES_PDF_native.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QPDFCryptoImpl.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/rijndael.h>
#include <cstring>
#include <stdexcept>
#include <stdlib.h>
#include <string>
AES_PDF_native::AES_PDF_native(
bool encrypt,
unsigned char const* a_key,
size_t key_bytes,
bool cbc_mode,
unsigned char* cbc_block) :
encrypt(encrypt),
cbc_mode(cbc_mode),
cbc_block(cbc_block)
{
size_t keybits = 8 * key_bytes;
key = std::make_unique<unsigned char[]>(key_bytes);
rk = std::make_unique<uint32_t[]>(RKLENGTH(keybits));
size_t rk_bytes = RKLENGTH(keybits) * sizeof(uint32_t);
std::memcpy(key.get(), a_key, key_bytes);
std::memset(rk.get(), 0, rk_bytes);
if (encrypt) {
nrounds = rijndaelSetupEncrypt(rk.get(), key.get(), keybits);
} else {
nrounds = rijndaelSetupDecrypt(rk.get(), key.get(), keybits);
}
}
void
AES_PDF_native::update(unsigned char* in_data, unsigned char* out_data)
{
if (encrypt) {
if (cbc_mode) {
for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i) {
in_data[i] ^= cbc_block[i];
}
}
rijndaelEncrypt(rk.get(), nrounds, in_data, out_data);
if (cbc_mode) {
memcpy(cbc_block, out_data, QPDFCryptoImpl::rijndael_buf_size);
}
} else {
rijndaelDecrypt(rk.get(), nrounds, in_data, out_data);
if (cbc_mode) {
for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i) {
out_data[i] ^= cbc_block[i];
}
memcpy(cbc_block, in_data, QPDFCryptoImpl::rijndael_buf_size);
}
}
}