chromium/third_party/pdfium/core/fpdfapi/parser/cpdf_crypto_handler.cpp

// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fpdfapi/parser/cpdf_crypto_handler.h"

#include <time.h>

#include <algorithm>
#include <stack>
#include <utility>

#include "constants/form_fields.h"
#include "core/fdrm/fx_crypt.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_object_walker.h"
#include "core/fpdfapi/parser/cpdf_parser.h"
#include "core/fpdfapi/parser/cpdf_security_handler.h"
#include "core/fpdfapi/parser/cpdf_simple_parser.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/fx_memcpy_wrappers.h"
#include "core/fxcrt/stl_util.h"

namespace {

constexpr char kContentsKey[] = …;
constexpr char kTypeKey[] = …;

}  // namespace

// static
bool CPDF_CryptoHandler::IsSignatureDictionary(
    const CPDF_Dictionary* dictionary) { … }

DataVector<uint8_t> CPDF_CryptoHandler::EncryptContent(
    uint32_t objnum,
    uint32_t gennum,
    pdfium::span<const uint8_t> source) const { … }

struct AESCryptContext { … };

void* CPDF_CryptoHandler::DecryptStart(uint32_t objnum, uint32_t gennum) { … }

bool CPDF_CryptoHandler::DecryptStream(void* context,
                                       pdfium::span<const uint8_t> source,
                                       BinaryBuffer& dest_buf) { … }

bool CPDF_CryptoHandler::DecryptFinish(void* context, BinaryBuffer& dest_buf) { … }

ByteString CPDF_CryptoHandler::Decrypt(uint32_t objnum,
                                       uint32_t gennum,
                                       const ByteString& str) { … }

size_t CPDF_CryptoHandler::DecryptGetSize(size_t src_size) { … }

bool CPDF_CryptoHandler::IsCipherAES() const { … }

bool CPDF_CryptoHandler::DecryptObjectTree(RetainPtr<CPDF_Object> object) { … }

CPDF_CryptoHandler::CPDF_CryptoHandler(Cipher cipher,
                                       pdfium::span<const uint8_t> key)
    : … { … }

CPDF_CryptoHandler::~CPDF_CryptoHandler() = default;

void CPDF_CryptoHandler::PopulateKey(uint32_t objnum,
                                     uint32_t gennum,
                                     uint8_t* key) const { … }