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