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cb769c62e5
This comment expands all tabs using an 8-character tab-width. You should ignore this commit when using git blame or use git blame -w. In the early days, I used to use tabs where possible for indentation, since emacs did this automatically. In recent years, I have switched to only using spaces, which means qpdf source code has been a mixture of spaces and tabs. I have avoided cleaning this up because of not wanting gratuitous whitespaces change to cloud the output of git blame, but I changed my mind after discussing with users who view qpdf source code in editors/IDEs that have other tab widths by default and in light of the fact that I am planning to start applying automatic code formatting soon.
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#include <qpdf/AES_PDF_native.hh>
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#include <qpdf/QUtil.hh>
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#include <cstring>
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#include <assert.h>
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#include <stdexcept>
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#include <qpdf/rijndael.h>
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#include <qpdf/QIntC.hh>
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#include <string>
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#include <stdlib.h>
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#include <qpdf/QPDFCryptoImpl.hh>
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AES_PDF_native::AES_PDF_native(bool encrypt, unsigned char const* key,
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size_t key_bytes, 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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{
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this->nrounds = rijndaelSetupEncrypt(
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this->rk.get(), this->key.get(), keybits);
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}
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else
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{
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this->nrounds = rijndaelSetupDecrypt(
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this->rk.get(), this->key.get(), keybits);
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}
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}
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AES_PDF_native::~AES_PDF_native()
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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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{
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if (this->cbc_mode)
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{
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for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i)
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{
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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(),
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this->nrounds, in_data, out_data);
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if (this->cbc_mode)
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{
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memcpy(this->cbc_block, out_data,
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QPDFCryptoImpl::rijndael_buf_size);
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}
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}
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else
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{
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rijndaelDecrypt(this->rk.get(),
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this->nrounds, in_data, out_data);
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if (this->cbc_mode)
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{
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for (size_t i = 0; i < QPDFCryptoImpl::rijndael_buf_size; ++i)
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{
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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,
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QPDFCryptoImpl::rijndael_buf_size);
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}
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}
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}
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