chromium/third_party/pdfium/core/fdrm/fx_crypt_aes.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/fdrm/fx_crypt_aes.h"

#include "core/fxcrt/byteorder.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_memcpy_wrappers.h"

#define mulby2(x) …

namespace {

constexpr std::array<const uint8_t, 256> Sbox = …;

constexpr std::array<const uint8_t, 256> Sboxinv = …;

constexpr std::array<const uint32_t, 256> E0 = …;

constexpr std::array<uint32_t, 256> E1 = …;

constexpr std::array<uint32_t, 256> E2 = …;

constexpr std::array<uint32_t, 256> E3 = …;

constexpr std::array<uint32_t, 256> D0 = …;
constexpr std::array<uint32_t, 256> D1 = …;

constexpr std::array<uint32_t, 256> D2 = …;

constexpr std::array<uint32_t, 256> D3 = …;

#define ADD_ROUND_KEY_4() …
#define MOVEWORD(i) …
#define FMAKEWORD …
#define LASTWORD …

void aes_encrypt_nb_4(CRYPT_aes_context* ctx, uint32_t* block) { … }
#undef FMAKEWORD
#undef LASTWORD

#define FMAKEWORD …
#define LASTWORD …

void aes_decrypt_nb_4(CRYPT_aes_context* ctx, uint32_t* block) { … }
#undef FMAKEWORD
#undef LASTWORD

}  // namespace

void CRYPT_AESSetKey(CRYPT_aes_context* ctx,
                     const uint8_t* key,
                     uint32_t keylen) { … }

void CRYPT_AESSetIV(CRYPT_aes_context* ctx, const uint8_t* iv) { … }

void CRYPT_AESDecrypt(CRYPT_aes_context* ctx,
                      uint8_t* dest,
                      const uint8_t* src,
                      uint32_t size) { … }

void CRYPT_AESEncrypt(CRYPT_aes_context* ctx,
                      pdfium::span<uint8_t> dest,
                      pdfium::span<const uint8_t> src) { … }