Split off IPDF_SecurityHandler and CPDF_StandardSecurityHandler.

core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp

 // Copyright 2014 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
 
 #include "core/include/fpdfapi/fpdf_parser.h"
 
 #include <time.h>
 
 #include "core/include/fpdfapi/cpdf_parser.h"
 #include "core/include/fpdfapi/cpdf_simple_parser.h"
+#include "core/include/fpdfapi/ipdf_security_handler.h"
 #include "core/include/fdrm/fx_crypt.h"
 
-const uint8_t defpasscode[32] = {
-    0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e,
-    0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68,
-    0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a};
-void CalcEncryptKey(CPDF_Dictionary* pEncrypt,
-                    const uint8_t* password,
-                    FX_DWORD pass_size,
-                    uint8_t* key,
-                    int keylen,
-                    FX_BOOL bIgnoreMeta,
-                    CPDF_Array* pIdArray) {
-  int revision = pEncrypt->GetIntegerBy("R");
-  uint8_t passcode[32];
-  for (FX_DWORD i = 0; i < 32; i++) {
-    passcode[i] = i < pass_size ? password[i] : defpasscode[i - pass_size];
-  }
-  uint8_t md5[100];
-  CRYPT_MD5Start(md5);
-  CRYPT_MD5Update(md5, passcode, 32);
-  CFX_ByteString okey = pEncrypt->GetStringBy("O");
-  CRYPT_MD5Update(md5, (uint8_t*)okey.c_str(), okey.GetLength());
-  FX_DWORD perm = pEncrypt->GetIntegerBy("P");
-  CRYPT_MD5Update(md5, (uint8_t*)&perm, 4);
-  if (pIdArray) {
-    CFX_ByteString id = pIdArray->GetStringAt(0);
-    CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength());
-  }
-  if (!bIgnoreMeta && revision >= 3 &&
-      !pEncrypt->GetIntegerBy("EncryptMetadata", 1)) {
-    FX_DWORD tag = (FX_DWORD)-1;
-    CRYPT_MD5Update(md5, (uint8_t*)&tag, 4);
-  }
-  uint8_t digest[16];
-  CRYPT_MD5Finish(md5, digest);
-  FX_DWORD copy_len = keylen;
-  if (copy_len > sizeof(digest)) {
-    copy_len = sizeof(digest);
-  }
-  if (revision >= 3) {
-    for (int i = 0; i < 50; i++) {
-      CRYPT_MD5Generate(digest, copy_len, digest);
-    }
-  }
-  FXSYS_memset(key, 0, keylen);
-  FXSYS_memcpy(key, digest, copy_len);
-}
-
-CPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() {
-  return new CPDF_StandardCryptoHandler;
-}
-
 struct PDF_CRYPTOITEM {
   int32_t m_Cipher;
   int32_t m_KeyLen;
   FX_BOOL m_bChecked;
   CPDF_StandardCryptoHandler* m_pCryptoHandler;
 };
 
-CPDF_StandardSecurityHandler::CPDF_StandardSecurityHandler() {
-  m_Version = 0;
-  m_Revision = 0;
-  m_pParser = NULL;
-  m_pEncryptDict = NULL;
-  m_Permissions = 0;
-  m_Cipher = FXCIPHER_NONE;
-  m_KeyLen = 0;
-}
-
-CPDF_StandardSecurityHandler::~CPDF_StandardSecurityHandler() {}
-FX_BOOL CPDF_StandardSecurityHandler::OnInit(CPDF_Parser* pParser,
-                                             CPDF_Dictionary* pEncryptDict) {
-  m_pParser = pParser;
-  if (!LoadDict(pEncryptDict)) {
-    return FALSE;
-  }
-  if (m_Cipher == FXCIPHER_NONE) {
-    return TRUE;
-  }
-  return CheckSecurity(m_KeyLen);
-}
-FX_BOOL CPDF_StandardSecurityHandler::CheckSecurity(int32_t key_len) {
-  CFX_ByteString password = m_pParser->GetPassword();
-  if (CheckPassword(password, password.GetLength(), TRUE, m_EncryptKey,
-                    key_len)) {
-    if (password.IsEmpty()) {
-      if (!CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey,
-                         key_len)) {
-        return FALSE;
-      }
-    }
-    return TRUE;
-  }
-  return CheckPassword(password, password.GetLength(), FALSE, m_EncryptKey,
-                       key_len);
-}
-FX_DWORD CPDF_StandardSecurityHandler::GetPermissions() {
-  return m_Permissions;
-}
-static FX_BOOL _LoadCryptInfo(CPDF_Dictionary* pEncryptDict,
-                              const CFX_ByteStringC& name,
-                              int& cipher,
-                              int& keylen) {
-  int Version = pEncryptDict->GetIntegerBy("V");
-  cipher = FXCIPHER_RC4;
-  keylen = 0;
-  if (Version >= 4) {
-    CPDF_Dictionary* pCryptFilters = pEncryptDict->GetDictBy("CF");
-    if (!pCryptFilters) {
-      return FALSE;
-    }
-    if (name == "Identity") {
-      cipher = FXCIPHER_NONE;
-    } else {
-      CPDF_Dictionary* pDefFilter = pCryptFilters->GetDictBy(name);
-      if (!pDefFilter) {
-        return FALSE;
-      }
-      int nKeyBits = 0;
-      if (Version == 4) {
-        nKeyBits = pDefFilter->GetIntegerBy("Length", 0);
-        if (nKeyBits == 0) {
-          nKeyBits = pEncryptDict->GetIntegerBy("Length", 128);
-        }
-      } else {
-        nKeyBits = pEncryptDict->GetIntegerBy("Length", 256);
-      }
-      if (nKeyBits < 40) {
-        nKeyBits *= 8;
-      }
-      keylen = nKeyBits / 8;
-      CFX_ByteString cipher_name = pDefFilter->GetStringBy("CFM");
-      if (cipher_name == "AESV2" || cipher_name == "AESV3") {
-        cipher = FXCIPHER_AES;
-      }
-    }
-  } else {
-    keylen = Version > 1 ? pEncryptDict->GetIntegerBy("Length", 40) / 8 : 5;
-  }
-  if (keylen > 32 || keylen < 0) {
-    return FALSE;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict) {
-  m_pEncryptDict = pEncryptDict;
-  m_Version = pEncryptDict->GetIntegerBy("V");
-  m_Revision = pEncryptDict->GetIntegerBy("R");
-  m_Permissions = pEncryptDict->GetIntegerBy("P", -1);
-  if (m_Version < 4) {
-    return _LoadCryptInfo(pEncryptDict, CFX_ByteString(), m_Cipher, m_KeyLen);
-  }
-  CFX_ByteString stmf_name = pEncryptDict->GetStringBy("StmF");
-  CFX_ByteString strf_name = pEncryptDict->GetStringBy("StrF");
-  if (stmf_name != strf_name) {
-    return FALSE;
-  }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, m_Cipher, m_KeyLen)) {
-    return FALSE;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict,
-                                               FX_DWORD type,
-                                               int& cipher,
-                                               int& key_len) {
-  m_pEncryptDict = pEncryptDict;
-  m_Version = pEncryptDict->GetIntegerBy("V");
-  m_Revision = pEncryptDict->GetIntegerBy("R");
-  m_Permissions = pEncryptDict->GetIntegerBy("P", -1);
-  CFX_ByteString strf_name, stmf_name;
-  if (m_Version >= 4) {
-    stmf_name = pEncryptDict->GetStringBy("StmF");
-    strf_name = pEncryptDict->GetStringBy("StrF");
-    if (stmf_name != strf_name) {
-      return FALSE;
-    }
-  }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, cipher, key_len)) {
-    return FALSE;
-  }
-  m_Cipher = cipher;
-  m_KeyLen = key_len;
-  return TRUE;
-}
-
-FX_BOOL CPDF_StandardSecurityHandler::GetCryptInfo(int& cipher,
-                                                   const uint8_t*& buffer,
-                                                   int& keylen) {
-  cipher = m_Cipher;
-  buffer = m_EncryptKey;
-  keylen = m_KeyLen;
-  return TRUE;
-}
-#define FX_GET_32WORD(n, b, i)                                        \
-  {                                                                   \
-    (n) = (FX_DWORD)(                                                 \
-        ((uint64_t)(b)[(i)] << 24) | ((uint64_t)(b)[(i) + 1] << 16) | \
-        ((uint64_t)(b)[(i) + 2] << 8) | ((uint64_t)(b)[(i) + 3]));    \
-  }
-int BigOrder64BitsMod3(uint8_t* data) {
-  uint64_t ret = 0;
-  for (int i = 0; i < 4; ++i) {
-    FX_DWORD value;
-    FX_GET_32WORD(value, data, 4 * i);
-    ret <<= 32;
-    ret |= value;
-    ret %= 3;
-  }
-  return (int)ret;
-}
-void Revision6_Hash(const uint8_t* password,
-                    FX_DWORD size,
-                    const uint8_t* salt,
-                    const uint8_t* vector,
-                    uint8_t* hash) {
-  int iBlockSize = 32;
-  uint8_t sha[128];
-  CRYPT_SHA256Start(sha);
-  CRYPT_SHA256Update(sha, password, size);
-  CRYPT_SHA256Update(sha, salt, 8);
-  if (vector) {
-    CRYPT_SHA256Update(sha, vector, 48);
-  }
-  uint8_t digest[32];
-  CRYPT_SHA256Finish(sha, digest);
-  CFX_ByteTextBuf buf;
-  uint8_t* input = digest;
-  uint8_t* key = input;
-  uint8_t* iv = input + 16;
-  uint8_t* E = buf.GetBuffer();
-  int iBufLen = buf.GetLength();
-  CFX_ByteTextBuf interDigest;
-  int i = 0;
-  uint8_t* aes = FX_Alloc(uint8_t, 2048);
-  while (i < 64 || i < E[iBufLen - 1] + 32) {
-    int iRoundSize = size + iBlockSize;
-    if (vector) {
-      iRoundSize += 48;
-    }
-    iBufLen = iRoundSize * 64;
-    buf.EstimateSize(iBufLen);
-    E = buf.GetBuffer();
-    CFX_ByteTextBuf content;
-    for (int j = 0; j < 64; ++j) {
-      content.AppendBlock(password, size);
-      content.AppendBlock(input, iBlockSize);
-      if (vector) {
-        content.AppendBlock(vector, 48);
-      }
-    }
-    CRYPT_AESSetKey(aes, 16, key, 16, TRUE);
-    CRYPT_AESSetIV(aes, iv);
-    CRYPT_AESEncrypt(aes, E, content.GetBuffer(), iBufLen);
-    int iHash = 0;
-    switch (BigOrder64BitsMod3(E)) {
-      case 0:
-        iHash = 0;
-        iBlockSize = 32;
-        break;
-      case 1:
-        iHash = 1;
-        iBlockSize = 48;
-        break;
-      default:
-        iHash = 2;
-        iBlockSize = 64;
-        break;
-    }
-    interDigest.EstimateSize(iBlockSize);
-    input = interDigest.GetBuffer();
-    if (iHash == 0) {
-      CRYPT_SHA256Generate(E, iBufLen, input);
-    } else if (iHash == 1) {
-      CRYPT_SHA384Generate(E, iBufLen, input);
-    } else if (iHash == 2) {
-      CRYPT_SHA512Generate(E, iBufLen, input);
-    }
-    key = input;
-    iv = input + 16;
-    ++i;
-  }
-  FX_Free(aes);
-  if (hash) {
-    FXSYS_memcpy(hash, input, 32);
-  }
-}
-FX_BOOL CPDF_StandardSecurityHandler::AES256_CheckPassword(
-    const uint8_t* password,
-    FX_DWORD size,
-    FX_BOOL bOwner,
-    uint8_t* key) {
-  CFX_ByteString okey =
-      m_pEncryptDict ? m_pEncryptDict->GetStringBy("O") : CFX_ByteString();
-  if (okey.GetLength() < 48) {
-    return FALSE;
-  }
-  CFX_ByteString ukey =
-      m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString();
-  if (ukey.GetLength() < 48) {
-    return FALSE;
-  }
-  const uint8_t* pkey = bOwner ? (const uint8_t*)okey : (const uint8_t*)ukey;
-  uint8_t sha[128];
-  uint8_t digest[32];
-  if (m_Revision >= 6) {
-    Revision6_Hash(password, size, (const uint8_t*)pkey + 32,
-                   (bOwner ? (const uint8_t*)ukey : NULL), digest);
-  } else {
-    CRYPT_SHA256Start(sha);
-    CRYPT_SHA256Update(sha, password, size);
-    CRYPT_SHA256Update(sha, pkey + 32, 8);
-    if (bOwner) {
-      CRYPT_SHA256Update(sha, ukey, 48);
-    }
-    CRYPT_SHA256Finish(sha, digest);
-  }
-  if (FXSYS_memcmp(digest, pkey, 32) != 0) {
-    return FALSE;
-  }
-  if (!key) {
-    return TRUE;
-  }
-  if (m_Revision >= 6) {
-    Revision6_Hash(password, size, (const uint8_t*)pkey + 40,
-                   (bOwner ? (const uint8_t*)ukey : NULL), digest);
-  } else {
-    CRYPT_SHA256Start(sha);
-    CRYPT_SHA256Update(sha, password, size);
-    CRYPT_SHA256Update(sha, pkey + 40, 8);
-    if (bOwner) {
-      CRYPT_SHA256Update(sha, ukey, 48);
-    }
-    CRYPT_SHA256Finish(sha, digest);
-  }
-  CFX_ByteString ekey = m_pEncryptDict
-                            ? m_pEncryptDict->GetStringBy(bOwner ? "OE" : "UE")
-                            : CFX_ByteString();
-  if (ekey.GetLength() < 32) {
-    return FALSE;
-  }
-  uint8_t* aes = FX_Alloc(uint8_t, 2048);
-  CRYPT_AESSetKey(aes, 16, digest, 32, FALSE);
-  uint8_t iv[16];
-  FXSYS_memset(iv, 0, 16);
-  CRYPT_AESSetIV(aes, iv);
-  CRYPT_AESDecrypt(aes, key, ekey, 32);
-  CRYPT_AESSetKey(aes, 16, key, 32, FALSE);
-  CRYPT_AESSetIV(aes, iv);
-  CFX_ByteString perms = m_pEncryptDict->GetStringBy("Perms");
-  if (perms.IsEmpty()) {
-    return FALSE;
-  }
-  uint8_t perms_buf[16];
-  FXSYS_memset(perms_buf, 0, sizeof(perms_buf));
-  FX_DWORD copy_len = sizeof(perms_buf);
-  if (copy_len > (FX_DWORD)perms.GetLength()) {
-    copy_len = perms.GetLength();
-  }
-  FXSYS_memcpy(perms_buf, (const uint8_t*)perms, copy_len);
-  uint8_t buf[16];
-  CRYPT_AESDecrypt(aes, buf, perms_buf, 16);
-  FX_Free(aes);
-  if (buf[9] != 'a' || buf[10] != 'd' || buf[11] != 'b') {
-    return FALSE;
-  }
-  if (FXDWORD_GET_LSBFIRST(buf) != m_Permissions) {
-    return FALSE;
-  }
-  if ((buf[8] == 'T' && !IsMetadataEncrypted()) ||
-      (buf[8] == 'F' && IsMetadataEncrypted())) {
-    return FALSE;
-  }
-  return TRUE;
-}
-
-int CPDF_StandardSecurityHandler::CheckPassword(const uint8_t* password,
-                                                FX_DWORD size,
-                                                FX_BOOL bOwner,
-                                                uint8_t* key,
-                                                int32_t key_len) {
-  if (m_Revision >= 5) {
-    return AES256_CheckPassword(password, size, bOwner, key);
-  }
-  uint8_t keybuf[32];
-  if (!key) {
-    key = keybuf;
-  }
-  if (bOwner) {
-    return CheckOwnerPassword(password, size, key, key_len);
-  }
-  return CheckUserPassword(password, size, FALSE, key, key_len) ||
-         CheckUserPassword(password, size, TRUE, key, key_len);
-}
-FX_BOOL CPDF_StandardSecurityHandler::CheckUserPassword(
-    const uint8_t* password,
-    FX_DWORD pass_size,
-    FX_BOOL bIgnoreEncryptMeta,
-    uint8_t* key,
-    int32_t key_len) {
-  CalcEncryptKey(m_pEncryptDict, password, pass_size, key, key_len,
-                 bIgnoreEncryptMeta, m_pParser->GetIDArray());
-  CFX_ByteString ukey =
-      m_pEncryptDict ? m_pEncryptDict->GetStringBy("U") : CFX_ByteString();
-  if (ukey.GetLength() < 16) {
-    return FALSE;
-  }
-  uint8_t ukeybuf[32];
-  if (m_Revision == 2) {
-    FXSYS_memcpy(ukeybuf, defpasscode, 32);
-    CRYPT_ArcFourCryptBlock(ukeybuf, 32, key, key_len);
-  } else {
-    uint8_t test[32], tmpkey[32];
-    FX_DWORD copy_len = sizeof(test);
-    if (copy_len > (FX_DWORD)ukey.GetLength()) {
-      copy_len = ukey.GetLength();
-    }
-    FXSYS_memset(test, 0, sizeof(test));
-    FXSYS_memset(tmpkey, 0, sizeof(tmpkey));
-    FXSYS_memcpy(test, ukey.c_str(), copy_len);
-    for (int i = 19; i >= 0; i--) {
-      for (int j = 0; j < key_len; j++) {
-        tmpkey[j] = key[j] ^ i;
-      }
-      CRYPT_ArcFourCryptBlock(test, 32, tmpkey, key_len);
-    }
-    uint8_t md5[100];
-    CRYPT_MD5Start(md5);
-    CRYPT_MD5Update(md5, defpasscode, 32);
-    CPDF_Array* pIdArray = m_pParser->GetIDArray();
-    if (pIdArray) {
-      CFX_ByteString id = pIdArray->GetStringAt(0);
-      CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength());
-    }
-    CRYPT_MD5Finish(md5, ukeybuf);
-    return FXSYS_memcmp(test, ukeybuf, 16) == 0;
-  }
-  if (FXSYS_memcmp((void*)ukey.c_str(), ukeybuf, 16) == 0) {
-    return TRUE;
-  }
-  return FALSE;
-}
-CFX_ByteString CPDF_StandardSecurityHandler::GetUserPassword(
-    const uint8_t* owner_pass,
-    FX_DWORD pass_size,
-    int32_t key_len) {
-  CFX_ByteString okey = m_pEncryptDict->GetStringBy("O");
-  uint8_t passcode[32];
-  FX_DWORD i;
-  for (i = 0; i < 32; i++) {
-    passcode[i] = i < pass_size ? owner_pass[i] : defpasscode[i - pass_size];
-  }
-  uint8_t digest[16];
-  CRYPT_MD5Generate(passcode, 32, digest);
-  if (m_Revision >= 3) {
-    for (int i = 0; i < 50; i++) {
-      CRYPT_MD5Generate(digest, 16, digest);
-    }
-  }
-  uint8_t enckey[32];
-  FXSYS_memset(enckey, 0, sizeof(enckey));
-  FX_DWORD copy_len = key_len;
-  if (copy_len > sizeof(digest)) {
-    copy_len = sizeof(digest);
-  }
-  FXSYS_memcpy(enckey, digest, copy_len);
-  int okeylen = okey.GetLength();
-  if (okeylen > 32) {
-    okeylen = 32;
-  }
-  uint8_t okeybuf[64];
-  FXSYS_memset(okeybuf, 0, sizeof(okeybuf));
-  FXSYS_memcpy(okeybuf, okey.c_str(), okeylen);
-  if (m_Revision == 2) {
-    CRYPT_ArcFourCryptBlock(okeybuf, okeylen, enckey, key_len);
-  } else {
-    for (int i = 19; i >= 0; i--) {
-      uint8_t tempkey[32];
-      FXSYS_memset(tempkey, 0, sizeof(tempkey));
-      for (int j = 0; j < m_KeyLen; j++) {
-        tempkey[j] = enckey[j] ^ i;
-      }
-      CRYPT_ArcFourCryptBlock(okeybuf, okeylen, tempkey, key_len);
-    }
-  }
-  int len = 32;
-  while (len && defpasscode[len - 1] == okeybuf[len - 1]) {
-    len--;
-  }
-  return CFX_ByteString(okeybuf, len);
-}
-FX_BOOL CPDF_StandardSecurityHandler::CheckOwnerPassword(
-    const uint8_t* password,
-    FX_DWORD pass_size,
-    uint8_t* key,
-    int32_t key_len) {
-  CFX_ByteString user_pass = GetUserPassword(password, pass_size, key_len);
-  if (CheckUserPassword(user_pass, user_pass.GetLength(), FALSE, key,
-                        key_len)) {
-    return TRUE;
-  }
-  return CheckUserPassword(user_pass, user_pass.GetLength(), TRUE, key,
-                           key_len);
-}
-FX_BOOL CPDF_StandardSecurityHandler::IsMetadataEncrypted() {
-  return m_pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE);
-}
-
-IPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler() {
-  return new CPDF_StandardSecurityHandler;
-}
-
-void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
-                                            CPDF_Array* pIdArray,
-                                            const uint8_t* user_pass,
-                                            FX_DWORD user_size,
-                                            const uint8_t* owner_pass,
-                                            FX_DWORD owner_size,
-                                            FX_BOOL bDefault,
-                                            FX_DWORD type) {
-  int cipher = 0, key_len = 0;
-  if (!LoadDict(pEncryptDict, type, cipher, key_len)) {
-    return;
-  }
-  if (bDefault && (!owner_pass || owner_size == 0)) {
-    owner_pass = user_pass;
-    owner_size = user_size;
-  }
-  if (m_Revision >= 5) {
-    int t = (int)time(NULL);
-    uint8_t sha[128];
-    CRYPT_SHA256Start(sha);
-    CRYPT_SHA256Update(sha, (uint8_t*)&t, sizeof t);
-    CRYPT_SHA256Update(sha, m_EncryptKey, 32);
-    CRYPT_SHA256Update(sha, (uint8_t*)"there", 5);
-    CRYPT_SHA256Finish(sha, m_EncryptKey);
-    AES256_SetPassword(pEncryptDict, user_pass, user_size, FALSE, m_EncryptKey);
-    if (bDefault) {
-      AES256_SetPassword(pEncryptDict, owner_pass, owner_size, TRUE,
-                         m_EncryptKey);
-      AES256_SetPerms(pEncryptDict, m_Permissions,
-                      pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE),
-                      m_EncryptKey);
-    }
-    return;
-  }
-  if (bDefault) {
-    uint8_t passcode[32];
-    FX_DWORD i;
-    for (i = 0; i < 32; i++) {
-      passcode[i] =
-          i < owner_size ? owner_pass[i] : defpasscode[i - owner_size];
-    }
-    uint8_t digest[16];
-    CRYPT_MD5Generate(passcode, 32, digest);
-    if (m_Revision >= 3) {
-      for (int i = 0; i < 50; i++) {
-        CRYPT_MD5Generate(digest, 16, digest);
-      }
-    }
-    uint8_t enckey[32];
-    FXSYS_memcpy(enckey, digest, key_len);
-    for (i = 0; i < 32; i++) {
-      passcode[i] = i < user_size ? user_pass[i] : defpasscode[i - user_size];
-    }
-    CRYPT_ArcFourCryptBlock(passcode, 32, enckey, key_len);
-    uint8_t tempkey[32];
-    if (m_Revision >= 3) {
-      for (i = 1; i <= 19; i++) {
-        for (int j = 0; j < key_len; j++) {
-          tempkey[j] = enckey[j] ^ (uint8_t)i;
-        }
-        CRYPT_ArcFourCryptBlock(passcode, 32, tempkey, key_len);
-      }
-    }
-    pEncryptDict->SetAtString("O", CFX_ByteString(passcode, 32));
-  }
-  CalcEncryptKey(m_pEncryptDict, (uint8_t*)user_pass, user_size, m_EncryptKey,
-                 key_len, FALSE, pIdArray);
-  if (m_Revision < 3) {
-    uint8_t tempbuf[32];
-    FXSYS_memcpy(tempbuf, defpasscode, 32);
-    CRYPT_ArcFourCryptBlock(tempbuf, 32, m_EncryptKey, key_len);
-    pEncryptDict->SetAtString("U", CFX_ByteString(tempbuf, 32));
-  } else {
-    uint8_t md5[100];
-    CRYPT_MD5Start(md5);
-    CRYPT_MD5Update(md5, defpasscode, 32);
-    if (pIdArray) {
-      CFX_ByteString id = pIdArray->GetStringAt(0);
-      CRYPT_MD5Update(md5, (uint8_t*)id.c_str(), id.GetLength());
-    }
-    uint8_t digest[32];
-    CRYPT_MD5Finish(md5, digest);
-    CRYPT_ArcFourCryptBlock(digest, 16, m_EncryptKey, key_len);
-    uint8_t tempkey[32];
-    for (int i = 1; i <= 19; i++) {
-      for (int j = 0; j < key_len; j++) {
-        tempkey[j] = m_EncryptKey[j] ^ (uint8_t)i;
-      }
-      CRYPT_ArcFourCryptBlock(digest, 16, tempkey, key_len);
-    }
-    CRYPT_MD5Generate(digest, 16, digest + 16);
-    pEncryptDict->SetAtString("U", CFX_ByteString(digest, 32));
-  }
-}
-void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
-                                            CPDF_Array* pIdArray,
-                                            const uint8_t* user_pass,
-                                            FX_DWORD user_size,
-                                            const uint8_t* owner_pass,
-                                            FX_DWORD owner_size,
-                                            FX_DWORD type) {
-  OnCreate(pEncryptDict, pIdArray, user_pass, user_size, owner_pass, owner_size,
-           TRUE, type);
-}
-void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
-                                            CPDF_Array* pIdArray,
-                                            const uint8_t* user_pass,
-                                            FX_DWORD user_size,
-                                            FX_DWORD type) {
-  OnCreate(pEncryptDict, pIdArray, user_pass, user_size, NULL, 0, FALSE, type);
-}
-void CPDF_StandardSecurityHandler::AES256_SetPassword(
-    CPDF_Dictionary* pEncryptDict,
-    const uint8_t* password,
-    FX_DWORD size,
-    FX_BOOL bOwner,
-    const uint8_t* key) {
-  uint8_t sha[128];
-  CRYPT_SHA1Start(sha);
-  CRYPT_SHA1Update(sha, key, 32);
-  CRYPT_SHA1Update(sha, (uint8_t*)"hello", 5);
-  uint8_t digest[20];
-  CRYPT_SHA1Finish(sha, digest);
-  CFX_ByteString ukey = pEncryptDict->GetStringBy("U");
-  uint8_t digest1[48];
-  if (m_Revision >= 6) {
-    Revision6_Hash(password, size, digest,
-                   (bOwner ? (const uint8_t*)ukey : NULL), digest1);
-  } else {
-    CRYPT_SHA256Start(sha);
-    CRYPT_SHA256Update(sha, password, size);
-    CRYPT_SHA256Update(sha, digest, 8);
-    if (bOwner) {
-      CRYPT_SHA256Update(sha, ukey, ukey.GetLength());
-    }
-    CRYPT_SHA256Finish(sha, digest1);
-  }
-  FXSYS_memcpy(digest1 + 32, digest, 16);
-  pEncryptDict->SetAtString(bOwner ? "O" : "U", CFX_ByteString(digest1, 48));
-  if (m_Revision >= 6) {
-    Revision6_Hash(password, size, digest + 8,
-                   (bOwner ? (const uint8_t*)ukey : NULL), digest1);
-  } else {
-    CRYPT_SHA256Start(sha);
-    CRYPT_SHA256Update(sha, password, size);
-    CRYPT_SHA256Update(sha, digest + 8, 8);
-    if (bOwner) {
-      CRYPT_SHA256Update(sha, ukey, ukey.GetLength());
-    }
-    CRYPT_SHA256Finish(sha, digest1);
-  }
-  uint8_t* aes = FX_Alloc(uint8_t, 2048);
-  CRYPT_AESSetKey(aes, 16, digest1, 32, TRUE);
-  uint8_t iv[16];
-  FXSYS_memset(iv, 0, 16);
-  CRYPT_AESSetIV(aes, iv);
-  CRYPT_AESEncrypt(aes, digest1, key, 32);
-  FX_Free(aes);
-  pEncryptDict->SetAtString(bOwner ? "OE" : "UE", CFX_ByteString(digest1, 32));
-}
-void CPDF_StandardSecurityHandler::AES256_SetPerms(
-    CPDF_Dictionary* pEncryptDict,
-    FX_DWORD permissions,
-    FX_BOOL bEncryptMetadata,
-    const uint8_t* key) {
-  uint8_t buf[16];
-  buf[0] = (uint8_t)permissions;
-  buf[1] = (uint8_t)(permissions >> 8);
-  buf[2] = (uint8_t)(permissions >> 16);
-  buf[3] = (uint8_t)(permissions >> 24);
-  buf[4] = 0xff;
-  buf[5] = 0xff;
-  buf[6] = 0xff;
-  buf[7] = 0xff;
-  buf[8] = bEncryptMetadata ? 'T' : 'F';
-  buf[9] = 'a';
-  buf[10] = 'd';
-  buf[11] = 'b';
-  uint8_t* aes = FX_Alloc(uint8_t, 2048);
-  CRYPT_AESSetKey(aes, 16, key, 32, TRUE);
-  uint8_t iv[16], buf1[16];
-  FXSYS_memset(iv, 0, 16);
-  CRYPT_AESSetIV(aes, iv);
-  CRYPT_AESEncrypt(aes, buf1, buf, 16);
-  FX_Free(aes);
-  pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16));
-}
 void CPDF_StandardCryptoHandler::CryptBlock(FX_BOOL bEncrypt,
                                             FX_DWORD objnum,
                                             FX_DWORD gennum,
                                             const uint8_t* src_buf,
                                             FX_DWORD src_size,
                                             uint8_t* dest_buf,
                                             FX_DWORD& dest_size) {
   if (m_Cipher == FXCIPHER_NONE) {
     FXSYS_memcpy(dest_buf, src_buf, src_size);
     return;
@@ skipping 304 matching lines @@
   str = dest_buf;
 }
 CPDF_StandardCryptoHandler::CPDF_StandardCryptoHandler() {
   m_pAESContext = NULL;
   m_Cipher = FXCIPHER_NONE;
   m_KeyLen = 0;
 }
 CPDF_StandardCryptoHandler::~CPDF_StandardCryptoHandler() {
   FX_Free(m_pAESContext);
 }