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Unified Diff: core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp

Issue 1898173002: Remove IPDF_CryptoHandler and IPDF_SecurityHandler. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Created 4 years, 8 months ago
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« core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp ('K') | « core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h ('k') | core/fpdfapi/fpdf_parser/cpdf_syntax_parser.h » ('j') | no next file with comments »
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Index: core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp b/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
deleted file mode 100644
index 627ff5263f7d5492f32b7c212f2988661aa5116d..0000000000000000000000000000000000000000
--- a/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
+++ /dev/null
@@ -1,715 +0,0 @@
-// 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/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h"
-
-#include <time.h>
-
-#include "core/fdrm/crypto/include/fx_crypt.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_standard_crypto_handler.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_object.h"
-#include "core/fpdfapi/fpdf_parser/include/cpdf_parser.h"
-
-namespace {
-
-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,
- uint32_t pass_size,
- uint8_t* key,
- int keylen,
- FX_BOOL bIgnoreMeta,
- CPDF_Array* pIdArray) {
- int revision = pEncrypt->GetIntegerBy("R");
- uint8_t passcode[32];
- for (uint32_t 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());
- uint32_t 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)) {
- uint32_t tag = (uint32_t)-1;
- CRYPT_MD5Update(md5, (uint8_t*)&tag, 4);
- }
- uint8_t digest[16];
- CRYPT_MD5Finish(md5, digest);
- uint32_t 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);
-}
-
-} // namespace
-
-IPDF_SecurityHandler::~IPDF_SecurityHandler() {}
-
-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() {}
-
-IPDF_CryptoHandler* CPDF_StandardSecurityHandler::CreateCryptoHandler() {
- return new CPDF_StandardCryptoHandler;
-}
-
-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.raw_str(), password.GetLength(), TRUE,
- m_EncryptKey, key_len)) {
- if (password.IsEmpty()) {
- if (!CheckPassword(password.raw_str(), password.GetLength(), FALSE,
- m_EncryptKey, key_len)) {
- return FALSE;
- }
- }
- return TRUE;
- }
- return CheckPassword(password.raw_str(), password.GetLength(), FALSE,
- m_EncryptKey, key_len);
-}
-uint32_t 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_ByteStringC(), 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.AsStringC(), m_Cipher,
- m_KeyLen)) {
- return FALSE;
- }
- return TRUE;
-}
-
-FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict,
- uint32_t 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.AsStringC(), 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) = (uint32_t)( \
- ((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) {
- uint32_t value;
- FX_GET_32WORD(value, data, 4 * i);
- ret <<= 32;
- ret |= value;
- ret %= 3;
- }
- return (int)ret;
-}
-void Revision6_Hash(const uint8_t* password,
- uint32_t 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,
- uint32_t 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 ? okey : ukey).raw_str();
- uint8_t sha[128];
- uint8_t digest[32];
- if (m_Revision >= 6) {
- Revision6_Hash(password, size, (const uint8_t*)pkey + 32,
- bOwner ? ukey.raw_str() : nullptr, digest);
- } else {
- CRYPT_SHA256Start(sha);
- CRYPT_SHA256Update(sha, password, size);
- CRYPT_SHA256Update(sha, pkey + 32, 8);
- if (bOwner) {
- CRYPT_SHA256Update(sha, ukey.raw_str(), 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 ? ukey.raw_str() : nullptr, digest);
- } else {
- CRYPT_SHA256Start(sha);
- CRYPT_SHA256Update(sha, password, size);
- CRYPT_SHA256Update(sha, pkey + 40, 8);
- if (bOwner) {
- CRYPT_SHA256Update(sha, ukey.raw_str(), 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.raw_str(), 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));
- uint32_t copy_len = sizeof(perms_buf);
- if (copy_len > (uint32_t)perms.GetLength()) {
- copy_len = perms.GetLength();
- }
- FXSYS_memcpy(perms_buf, perms.raw_str(), 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,
- uint32_t 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,
- uint32_t 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];
- uint32_t copy_len = sizeof(test);
- if (copy_len > (uint32_t)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,
- uint32_t pass_size,
- int32_t key_len) {
- CFX_ByteString okey = m_pEncryptDict->GetStringBy("O");
- uint8_t passcode[32];
- uint32_t 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));
- uint32_t 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,
- uint32_t pass_size,
- uint8_t* key,
- int32_t key_len) {
- CFX_ByteString user_pass = GetUserPassword(password, pass_size, key_len);
- if (CheckUserPassword(user_pass.raw_str(), user_pass.GetLength(), FALSE, key,
- key_len)) {
- return TRUE;
- }
- return CheckUserPassword(user_pass.raw_str(), user_pass.GetLength(), TRUE,
- key, key_len);
-}
-FX_BOOL CPDF_StandardSecurityHandler::IsMetadataEncrypted() {
- return m_pEncryptDict->GetBooleanBy("EncryptMetadata", TRUE);
-}
-
-void CPDF_StandardSecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
- CPDF_Array* pIdArray,
- const uint8_t* user_pass,
- uint32_t user_size,
- const uint8_t* owner_pass,
- uint32_t owner_size,
- FX_BOOL bDefault,
- uint32_t 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];
- uint32_t 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,
- uint32_t user_size,
- const uint8_t* owner_pass,
- uint32_t owner_size,
- uint32_t 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,
- uint32_t user_size,
- uint32_t type) {
- OnCreate(pEncryptDict, pIdArray, user_pass, user_size, NULL, 0, FALSE, type);
-}
-void CPDF_StandardSecurityHandler::AES256_SetPassword(
- CPDF_Dictionary* pEncryptDict,
- const uint8_t* password,
- uint32_t 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 ? ukey.raw_str() : nullptr,
- digest1);
- } else {
- CRYPT_SHA256Start(sha);
- CRYPT_SHA256Update(sha, password, size);
- CRYPT_SHA256Update(sha, digest, 8);
- if (bOwner) {
- CRYPT_SHA256Update(sha, ukey.raw_str(), 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 ? ukey.raw_str() : nullptr, digest1);
- } else {
- CRYPT_SHA256Start(sha);
- CRYPT_SHA256Update(sha, password, size);
- CRYPT_SHA256Update(sha, digest + 8, 8);
- if (bOwner) {
- CRYPT_SHA256Update(sha, ukey.raw_str(), 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,
- uint32_t 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));
-}
« core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp ('K') | « core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h ('k') | core/fpdfapi/fpdf_parser/cpdf_syntax_parser.h » ('j') | no next file with comments »

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