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// Copyright 2016 PDFium Authors. All rights reserved.
// 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
#ifndef CORE_FPDFAPI_PARSER_CPDF_CRYPTO_HANDLER_H_
#define CORE_FPDFAPI_PARSER_CPDF_CRYPTO_HANDLER_H_
#include <memory>
#include "core/fdrm/crypto/fx_crypt.h"
#include "core/fxcrt/cfx_binarybuf.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/retain_ptr.h"
#include "third_party/base/span.h"
class CPDF_Dictionary;
class CPDF_Object;
class CPDF_SecurityHandler;
class CPDF_CryptoHandler {
public:
CPDF_CryptoHandler(int cipher, const uint8_t* key, int keylen);
~CPDF_CryptoHandler();
static bool IsSignatureDictionary(const CPDF_Dictionary* dictionary);
std::unique_ptr<CPDF_Object> DecryptObjectTree(
std::unique_ptr<CPDF_Object> object);
size_t EncryptGetSize(pdfium::span<const uint8_t> source) const;
bool EncryptContent(uint32_t objnum,
uint32_t version,
pdfium::span<const uint8_t> source,
uint8_t* dest_buf,
uint32_t& dest_size);
bool IsCipherAES() const;
private:
uint32_t DecryptGetSize(uint32_t src_size);
void* DecryptStart(uint32_t objnum, uint32_t gennum);
ByteString Decrypt(uint32_t objnum, uint32_t gennum, const ByteString& str);
bool DecryptStream(void* context,
pdfium::span<const uint8_t> source,
CFX_BinaryBuf& dest_buf);
bool DecryptFinish(void* context, CFX_BinaryBuf& dest_buf);
void PopulateKey(uint32_t objnum, uint32_t gennum, uint8_t* key);
void CryptBlock(bool bEncrypt,
uint32_t objnum,
uint32_t gennum,
pdfium::span<const uint8_t> source,
uint8_t* dest_buf,
uint32_t& dest_size);
void* CryptStart(uint32_t objnum, uint32_t gennum, bool bEncrypt);
bool CryptStream(void* context,
pdfium::span<const uint8_t> source,
CFX_BinaryBuf& dest_buf,
bool bEncrypt);
bool CryptFinish(void* context, CFX_BinaryBuf& dest_buf, bool bEncrypt);
int m_KeyLen;
int m_Cipher;
std::unique_ptr<CRYPT_aes_context, FxFreeDeleter> m_pAESContext;
uint8_t m_EncryptKey[32];
};
#endif // CORE_FPDFAPI_PARSER_CPDF_CRYPTO_HANDLER_H_
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