#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* key,

    size_t key_bytes,

    bool cbc_mode,

    unsigned char* cbc_block) :

    encrypt(encrypt),

    cbc_mode(cbc_mode),

    cbc_block(cbc_block),

    nrounds(0)

{

    size_t keybits = 8 * key_bytes;

    this->key = std::make_unique<unsigned char[]>(key_bytes);

    this->rk = std::make_unique<uint32_t[]>(RKLENGTH(keybits));

    size_t rk_bytes = RKLENGTH(keybits) * sizeof(uint32_t);

    std::memcpy(this->key.get(), key, key_bytes);

    std::memset(this->rk.get(), 0, rk_bytes);

    if (encrypt) {

        this->nrounds = rijndaelSetupEncrypt(this->rk.get(), this->key.get(), keybits);

    } else {

        this->nrounds = rijndaelSetupDecrypt(this->rk.get(), this->key.get(), keybits);

    }

}

void

AES_PDF_native::update(unsigned char* in_data, unsigned char* out_data)

{

    if (this->encrypt) {

        if (this->cbc_mode) {

            for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i) {

                in_data[i] ^= this->cbc_block[i];

            }

        }

        rijndaelEncrypt(this->rk.get(), this->nrounds, in_data, out_data);

        if (this->cbc_mode) {

            memcpy(this->cbc_block, out_data, QPDFCryptoImpl::rijndael_buf_size);

        }

    } else {

        rijndaelDecrypt(this->rk.get(), this->nrounds, in_data, out_data);

        if (this->cbc_mode) {

            for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i) {

                out_data[i] ^= this->cbc_block[i];

            }

            memcpy(this->cbc_block, in_data, QPDFCryptoImpl::rijndael_buf_size);

        }

    }

}