fx_crypt.h

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// 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
 
#ifndef CORE_FDRM_FX_CRYPT_H_
#define CORE_FDRM_FX_CRYPT_H_
 
#include <stdint.h>
#include <array>
 
#include "core/fdrm/fx_crypt_aes.h"
#include "core/fdrm/fx_crypt_sha.h"
#include "core/fxcrt/span.h"
 
struct CRYPT_rc4_context {
  static constexpr int32_t kPermutationLength = 256;
 
  int32_t x;
  int32_t y;
  std::array<int32_t, kPermutationLength> m;
};
 
struct CRYPT_md5_context {
  std::array<uint32_t, 2> total;
  std::array<uint32_t, 4> state;
  uint8_t buffer[64];
};
 
void CRYPT_ArcFourCryptBlock(pdfium::span<uint8_t> data,
                             pdfium::span<const uint8_t> key);
void CRYPT_ArcFourSetup(CRYPT_rc4_context* context,
                        pdfium::span<const uint8_t> key);
void CRYPT_ArcFourCrypt(CRYPT_rc4_context* context, pdfium::span<uint8_t> data);
 
CRYPT_md5_context CRYPT_MD5Start();
void CRYPT_MD5Update(CRYPT_md5_context* context,
                     pdfium::span<const uint8_t> data);
void CRYPT_MD5Finish(CRYPT_md5_context* context,
                     pdfium::span<uint8_t, 16> digest);
void CRYPT_MD5Generate(pdfium::span<const uint8_t> data,
                       pdfium::span<uint8_t, 16> digest);
 
#endif  // CORE_FDRM_FX_CRYPT_H_