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850 lines
29 KiB
C++
850 lines
29 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2016
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
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* EU, LV-1021.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#include <string.h>
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#include "MemoryUtils.h"
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#include "Decrypt.h"
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namespace PdfReader
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{
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static void RC4InitKey(unsigned char *sKey, int nKeyLen, unsigned char *sState);
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static unsigned char RC4DecryptByte(unsigned char *sState, unsigned char *pX, unsigned char *pY, unsigned char nChar);
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static void AESKeyExpansion(DecryptAESState *pState, unsigned char *sObjectKey, int nObjectKeyLen);
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static void AESDecryptBlock(DecryptAESState *pState, unsigned char *sIn, bool bLast);
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static void MD5(unsigned char *sMessage, int nMessageLen, unsigned char *sDigest);
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static unsigned char passwordPad[32] =
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{
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0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41,
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0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08,
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0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80,
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0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a
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};
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//-------------------------------------------------------------------------------------------------------------------------------
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// Decrypt
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//-------------------------------------------------------------------------------------------------------------------------------
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bool Decrypt::MakeFileKey(int nEncVersion, int nEncRevision, int nKeyLength, StringExt *seOwnerKey, StringExt *seUserKey, int nPermissions, StringExt *seFileID, StringExt *seOwnerPassword, StringExt *seUserPassword, unsigned char *sFileKey, bool bEncryptMetadata, bool *pbOwnerPasswordValid)
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{
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// Попытаемся, используя пароль владельца, сгенерировать пользовательский пароль
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*pbOwnerPasswordValid = false;
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if (seOwnerPassword)
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{
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int nLen = seOwnerPassword->GetLength();
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unsigned char arrOwnerPass[32];
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if (nLen < 32)
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{
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memcpy(arrOwnerPass, seOwnerPassword->GetBuffer(), nLen);
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memcpy(arrOwnerPass + nLen, passwordPad, 32 - nLen);
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}
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else
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{
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memcpy(arrOwnerPass, seOwnerPassword->GetBuffer(), 32);
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}
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MD5(arrOwnerPass, 32, arrOwnerPass);
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if (nEncRevision == 3)
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{
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for (int nIndex = 0; nIndex < 50; ++nIndex)
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{
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MD5(arrOwnerPass, 16, arrOwnerPass);
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}
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}
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unsigned char arrOwnerKey[32];
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unsigned char arrFState[256];
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if (nEncRevision == 2)
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{
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RC4InitKey(arrOwnerPass, nKeyLength, arrFState);
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unsigned char unFX = 0, unFY = 0;
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for (int nIndex = 0; nIndex < 32; ++nIndex)
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{
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arrOwnerKey[nIndex] = RC4DecryptByte(arrFState, &unFX, &unFY, seOwnerKey->GetAt(nIndex));
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}
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}
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else
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{
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memcpy(arrOwnerKey, seOwnerKey->GetBuffer(), 32);
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for (int nIndex = 19; nIndex >= 0; --nIndex)
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{
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unsigned char arrTempKey[16];
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for (int nJ = 0; nJ < nKeyLength; ++nJ)
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{
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arrTempKey[nJ] = arrOwnerPass[nJ] ^ nIndex;
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}
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RC4InitKey(arrTempKey, nKeyLength, arrFState);
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unsigned char unFX = 0, unFY = 0;
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for (int nJ = 0; nJ < 32; ++nJ)
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{
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arrOwnerKey[nJ] = RC4DecryptByte(arrFState, &unFX, &unFY, arrOwnerKey[nJ]);
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}
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}
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}
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StringExt *seUserPassword2 = new StringExt((char *)arrOwnerKey, 32);
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if (MakeFileKey2(nEncVersion, nEncRevision, nKeyLength, seOwnerKey, seUserKey, nPermissions, seFileID, seUserPassword2, sFileKey, bEncryptMetadata))
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{
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*pbOwnerPasswordValid = true;
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delete seUserPassword2;
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return true;
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}
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delete seUserPassword2;
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}
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// Попытаемся использовать пользовательский пароль
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return MakeFileKey2(nEncVersion, nEncRevision, nKeyLength, seOwnerKey, seUserKey, nPermissions, seFileID, seUserPassword, sFileKey, bEncryptMetadata);
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}
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bool Decrypt::MakeFileKey2(int nEncVersion, int nEncRevision, int nKeyLength, StringExt *seOwnerKey, StringExt *seUserKey, int nPermissions, StringExt *seFileID, StringExt *seUserPassword, unsigned char *sFileKey, bool bEncryptMetadata)
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{
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unsigned char sTest[32];
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unsigned char sFState[256];
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unsigned char sTempKey[16];
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unsigned char unFx, unFy;
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int nLen = 0;
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bool bResult = true;
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unsigned char *pBuffer = (unsigned char *)MemUtilsMalloc(72 + seFileID->GetLength());
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if (seUserPassword)
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{
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nLen = seUserPassword->GetLength();
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if (nLen < 32)
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{
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memcpy(pBuffer, seUserPassword->GetBuffer(), nLen);
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memcpy(pBuffer + nLen, passwordPad, 32 - nLen);
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}
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else
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{
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memcpy(pBuffer, seUserPassword->GetBuffer(), 32);
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}
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}
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else
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{
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memcpy(pBuffer, passwordPad, 32);
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}
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memcpy(pBuffer + 32, seOwnerKey->GetBuffer(), 32);
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pBuffer[64] = nPermissions & 0xff;
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pBuffer[65] = (nPermissions >> 8) & 0xff;
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pBuffer[66] = (nPermissions >> 16) & 0xff;
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pBuffer[67] = (nPermissions >> 24) & 0xff;
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memcpy(pBuffer + 68, seFileID->GetBuffer(), seFileID->GetLength());
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nLen = 68 + seFileID->GetLength();
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if (!bEncryptMetadata)
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{
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pBuffer[nLen++] = 0xff;
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pBuffer[nLen++] = 0xff;
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pBuffer[nLen++] = 0xff;
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pBuffer[nLen++] = 0xff;
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}
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MD5(pBuffer, nLen, sFileKey);
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if (nEncRevision == 3)
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{
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for (int nIndex = 0; nIndex < 50; ++nIndex)
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{
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MD5(sFileKey, nKeyLength, sFileKey);
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}
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}
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if (nEncRevision == 2)
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{
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RC4InitKey(sFileKey, nKeyLength, sFState);
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unFx = unFy = 0;
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for (int nJ = 0; nJ < 32; ++nJ)
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{
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sTest[nJ] = RC4DecryptByte(sFState, &unFx, &unFy, seUserKey->GetAt(nJ));
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}
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bResult = (memcmp(sTest, passwordPad, 32) == 0);
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}
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else if (nEncRevision == 3)
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{
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memcpy(sTest, seUserKey->GetBuffer(), 32);
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for (int nIndex = 19; nIndex >= 0; --nIndex)
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{
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for (int nJ = 0; nJ < nKeyLength; ++nJ)
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{
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sTempKey[nJ] = sFileKey[nJ] ^ nIndex;
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}
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RC4InitKey(sTempKey, nKeyLength, sFState);
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unFx = unFy = 0;
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for (int nJ = 0; nJ < 32; ++nJ)
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{
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sTest[nJ] = RC4DecryptByte(sFState, &unFx, &unFy, sTest[nJ]);
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}
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}
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memcpy(pBuffer, passwordPad, 32);
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memcpy(pBuffer + 32, seFileID->GetBuffer(), seFileID->GetLength());
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MD5(pBuffer, 32 + seFileID->GetLength(), pBuffer);
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bResult = (memcmp(sTest, pBuffer, 16) == 0);
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}
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else
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{
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bResult = false;
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}
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MemUtilsFree(pBuffer);
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return bResult;
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}
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//-------------------------------------------------------------------------------------------------------------------------------
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// DecryptStream
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//-------------------------------------------------------------------------------------------------------------------------------
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DecryptStream::DecryptStream(Stream *pStream, unsigned char *sFileKey, CryptAlgorithm eType, int nKeyLength, int nObjectNum, int nObjectGen) :
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FilterStream(pStream)
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{
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m_eCryptType = eType;
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for (int nIndex = 0; nIndex < nKeyLength; ++nIndex)
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{
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m_sObjectKey[nIndex] = sFileKey[nIndex];
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}
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m_sObjectKey[nKeyLength + 0] = nObjectNum & 0xff;
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m_sObjectKey[nKeyLength + 1] = (nObjectNum >> 8) & 0xff;
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m_sObjectKey[nKeyLength + 2] = (nObjectNum >> 16) & 0xff;
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m_sObjectKey[nKeyLength + 3] = nObjectGen & 0xff;
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m_sObjectKey[nKeyLength + 4] = (nObjectGen >> 8) & 0xff;
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int nLen = 0;
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if (m_eCryptType == cryptAES)
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{
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m_sObjectKey[nKeyLength + 5] = 0x73; // 's'
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m_sObjectKey[nKeyLength + 6] = 0x41; // 'A'
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m_sObjectKey[nKeyLength + 7] = 0x6c; // 'l'
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m_sObjectKey[nKeyLength + 8] = 0x54; // 'T'
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nLen = nKeyLength + 9;
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}
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else
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{
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nLen = nKeyLength + 5;
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}
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MD5(m_sObjectKey, nLen, m_sObjectKey);
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if ((m_nObjectKeyLength = nKeyLength + 5) > 16)
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{
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m_nObjectKeyLength = 16;
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}
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}
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DecryptStream::~DecryptStream()
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{
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delete m_pStream;
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}
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void DecryptStream::Reset()
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{
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m_pStream->Reset();
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switch (m_eCryptType)
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{
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case cryptRC4:
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m_oState.oRC4.unX = m_oState.oRC4.unY = 0;
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RC4InitKey(m_sObjectKey, m_nObjectKeyLength, m_oState.oRC4.sState);
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m_oState.oRC4.nBuffer = EOF;
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break;
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case cryptAES:
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AESKeyExpansion(&m_oState.oAES, m_sObjectKey, m_nObjectKeyLength);
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for (int nIndex = 0; nIndex < 16; ++nIndex)
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{
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m_oState.oAES.sCBC[nIndex] = m_pStream->GetChar();
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}
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m_oState.oAES.nBufferIndex = 16;
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break;
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}
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}
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int DecryptStream::GetChar()
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{
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unsigned char sIn[16];
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int nChar = EOF;
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switch (m_eCryptType)
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{
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case cryptRC4:
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if (m_oState.oRC4.nBuffer == EOF)
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{
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nChar = m_pStream->GetChar();
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if (nChar != EOF)
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{
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m_oState.oRC4.nBuffer = RC4DecryptByte(m_oState.oRC4.sState, &m_oState.oRC4.unX, &m_oState.oRC4.unY, (unsigned char)nChar);
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}
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}
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nChar = m_oState.oRC4.nBuffer;
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m_oState.oRC4.nBuffer = EOF;
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break;
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case cryptAES:
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if (m_oState.oAES.nBufferIndex == 16)
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{
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for (int nIndex = 0; nIndex < 16; ++nIndex)
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{
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if ((nChar = m_pStream->GetChar()) == EOF)
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{
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return EOF;
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}
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sIn[nIndex] = (unsigned char)nChar;
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}
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AESDecryptBlock(&m_oState.oAES, sIn, m_pStream->LookChar() == EOF);
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}
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if (m_oState.oAES.nBufferIndex >= 16)
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{
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nChar = EOF;
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}
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else
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{
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nChar = m_oState.oAES.sBuffer[m_oState.oAES.nBufferIndex++];
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}
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break;
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}
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return nChar;
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}
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int DecryptStream::LookChar()
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{
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unsigned char sIn[16];
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int nChar = EOF;
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switch (m_eCryptType)
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{
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case cryptRC4:
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if (m_oState.oRC4.nBuffer == EOF)
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{
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nChar = m_pStream->GetChar();
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if (nChar != EOF)
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{
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m_oState.oRC4.nBuffer = RC4DecryptByte(m_oState.oRC4.sState, &m_oState.oRC4.unX, &m_oState.oRC4.unY, (unsigned char)nChar);
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}
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}
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nChar = m_oState.oRC4.nBuffer;
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break;
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case cryptAES:
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if (m_oState.oAES.nBufferIndex == 16)
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{
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for (int nIndex = 0; nIndex < 16; ++nIndex)
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{
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if ((nChar = m_pStream->GetChar()) == EOF)
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{
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return EOF;
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}
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sIn[nIndex] = nChar;
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}
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AESDecryptBlock(&m_oState.oAES, sIn, m_pStream->LookChar() == EOF);
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}
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if (m_oState.oAES.nBufferIndex == 16)
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{
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nChar = EOF;
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}
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else
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{
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nChar = m_oState.oAES.sBuffer[m_oState.oAES.nBufferIndex];
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}
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break;
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}
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return nChar;
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}
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bool DecryptStream::IsBinary(bool bLast)
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{
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return m_pStream->IsBinary(bLast);
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}
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//-------------------------------------------------------------------------------------------------------------------------------
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// RC4
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//-------------------------------------------------------------------------------------------------------------------------------
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static void RC4InitKey(unsigned char *sKey, int nKeyLen, unsigned char *sState)
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{
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for (int nIndex = 0; nIndex < 256; ++nIndex)
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sState[nIndex] = nIndex;
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//unsigned char unIndex1 = 0, unIndex2 = 0;
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//for ( int nIndex = 0; nIndex < 256; ++nIndex )
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//{
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// unIndex2 = ( sKey[unIndex1] + sState[nIndex] + unIndex2 ) % 256;
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// unsigned char unTemp = sState[nIndex];
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// sState[nIndex] = sState[unIndex2];
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// sState[unIndex2] = nIndex;
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// unIndex1 = (unIndex1 + 1) % nKeyLen;
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//}
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for (int i = 0, j = 0; i < 256; i++)
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{
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j = (j + sKey[i % nKeyLen] + sState[i]) % 256;
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unsigned char unTemp = sState[i];
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sState[i] = sState[j];
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sState[j] = unTemp;
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}
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}
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static unsigned char RC4DecryptByte(unsigned char *sState, unsigned char *pX, unsigned char *pY, unsigned char nChar)
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{
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unsigned char unX1 = *pX = (*pX + 1) % 256;
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unsigned char unY1 = *pY = (sState[*pX] + *pY) % 256;
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unsigned char unTempX = sState[unX1];
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unsigned char unTempY = sState[unY1];
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sState[unX1] = unTempY;
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sState[unY1] = unTempX;
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return nChar ^ sState[(unTempX + unTempY) % 256];
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}
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//-------------------------------------------------------------------------------------------------------------------------------
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// AES
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//-------------------------------------------------------------------------------------------------------------------------------
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static unsigned char c_sSbox[256] =
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{
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
|
||
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
|
||
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
|
||
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
|
||
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
|
||
};
|
||
|
||
static unsigned char c_sInvSbox[256] =
|
||
{
|
||
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
|
||
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
|
||
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
|
||
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
|
||
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
|
||
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
|
||
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
|
||
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
|
||
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
|
||
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
|
||
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
|
||
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
|
||
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
|
||
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
|
||
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
|
||
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
|
||
};
|
||
|
||
static unsigned int c_arrRCon[11] =
|
||
{
|
||
0x00000000, // не используется
|
||
0x01000000,
|
||
0x02000000,
|
||
0x04000000,
|
||
0x08000000,
|
||
0x10000000,
|
||
0x20000000,
|
||
0x40000000,
|
||
0x80000000,
|
||
0x1b000000,
|
||
0x36000000
|
||
};
|
||
|
||
static inline unsigned int SubWord(unsigned int unValue)
|
||
{
|
||
return (c_sSbox[unValue >> 24] << 24) | (c_sSbox[(unValue >> 16) & 0xff] << 16) | (c_sSbox[(unValue >> 8) & 0xff] << 8) | c_sSbox[unValue & 0xff];
|
||
}
|
||
|
||
static inline unsigned int RotWord(unsigned int unValue)
|
||
{
|
||
return ((unValue << 8) & 0xffffffff) | (unValue >> 24);
|
||
}
|
||
|
||
static inline void InvSubBytes(unsigned char *sState)
|
||
{
|
||
for (int nIndex = 0; nIndex < 16; ++nIndex)
|
||
{
|
||
sState[nIndex] = c_sInvSbox[sState[nIndex]];
|
||
}
|
||
}
|
||
|
||
static inline void InvShiftRows(unsigned char *sState)
|
||
{
|
||
unsigned char unTemp = 0;
|
||
|
||
unTemp = sState[7];
|
||
sState[7] = sState[6];
|
||
sState[6] = sState[5];
|
||
sState[5] = sState[4];
|
||
sState[4] = unTemp;
|
||
|
||
unTemp = sState[8];
|
||
sState[8] = sState[10];
|
||
sState[10] = unTemp;
|
||
|
||
unTemp = sState[9];
|
||
sState[9] = sState[11];
|
||
sState[11] = unTemp;
|
||
|
||
unTemp = sState[12];
|
||
sState[12] = sState[13];
|
||
sState[13] = sState[14];
|
||
sState[14] = sState[15];
|
||
sState[15] = unTemp;
|
||
}
|
||
|
||
// 09 ... nChar
|
||
static inline unsigned char Mult09(unsigned char nChar)
|
||
{
|
||
unsigned char nChar2 = (nChar & 0x80) ? ((nChar << 1) ^ 0x1b) : (nChar << 1);
|
||
unsigned char nChar4 = (nChar2 & 0x80) ? ((nChar2 << 1) ^ 0x1b) : (nChar2 << 1);
|
||
unsigned char nChar8 = (nChar4 & 0x80) ? ((nChar4 << 1) ^ 0x1b) : (nChar4 << 1);
|
||
|
||
return nChar ^ nChar8;
|
||
}
|
||
|
||
// 0b ... nChar
|
||
static inline unsigned char Mult0b(unsigned char nChar)
|
||
{
|
||
unsigned char nChar2 = (nChar & 0x80) ? ((nChar << 1) ^ 0x1b) : (nChar << 1);
|
||
unsigned char nChar4 = (nChar2 & 0x80) ? ((nChar2 << 1) ^ 0x1b) : (nChar2 << 1);
|
||
unsigned char nChar8 = (nChar4 & 0x80) ? ((nChar4 << 1) ^ 0x1b) : (nChar4 << 1);
|
||
return nChar ^ nChar2 ^ nChar8;
|
||
}
|
||
|
||
// 0d ... nChar
|
||
static inline unsigned char Mult0d(unsigned char nChar)
|
||
{
|
||
unsigned char nChar2 = (nChar & 0x80) ? ((nChar << 1) ^ 0x1b) : (nChar << 1);
|
||
unsigned char nChar4 = (nChar2 & 0x80) ? ((nChar2 << 1) ^ 0x1b) : (nChar2 << 1);
|
||
unsigned char nChar8 = (nChar4 & 0x80) ? ((nChar4 << 1) ^ 0x1b) : (nChar4 << 1);
|
||
return nChar ^ nChar4 ^ nChar8;
|
||
}
|
||
|
||
// 0e ... nChar
|
||
static inline unsigned char Mult0e(unsigned char nChar)
|
||
{
|
||
unsigned char nChar2 = (nChar & 0x80) ? ((nChar << 1) ^ 0x1b) : (nChar << 1);
|
||
unsigned char nChar4 = (nChar2 & 0x80) ? ((nChar2 << 1) ^ 0x1b) : (nChar2 << 1);
|
||
unsigned char nChar8 = (nChar4 & 0x80) ? ((nChar4 << 1) ^ 0x1b) : (nChar4 << 1);
|
||
return nChar2 ^ nChar4 ^ nChar8;
|
||
}
|
||
|
||
static inline void InvMixColumns(unsigned char *sState)
|
||
{
|
||
for (int nChar = 0; nChar < 4; ++nChar)
|
||
{
|
||
unsigned char unS0 = sState[nChar + 0];
|
||
unsigned char unS4 = sState[nChar + 4];
|
||
unsigned char unS8 = sState[nChar + 8];
|
||
unsigned char unS12 = sState[nChar + 12];
|
||
sState[nChar + 0] = Mult0e(unS0) ^ Mult0b(unS4) ^ Mult0d(unS8) ^ Mult09(unS12);
|
||
sState[nChar + 4] = Mult09(unS0) ^ Mult0e(unS4) ^ Mult0b(unS8) ^ Mult0d(unS12);
|
||
sState[nChar + 8] = Mult0d(unS0) ^ Mult09(unS4) ^ Mult0e(unS8) ^ Mult0b(unS12);
|
||
sState[nChar + 12] = Mult0b(unS0) ^ Mult0d(unS4) ^ Mult09(unS8) ^ Mult0e(unS12);
|
||
}
|
||
}
|
||
|
||
static inline void InvMixColumnsW(unsigned int *pW)
|
||
{
|
||
|
||
for (int nChar = 0; nChar < 4; ++nChar)
|
||
{
|
||
unsigned char unS0 = pW[nChar] >> 24;
|
||
unsigned char unS1 = pW[nChar] >> 16;
|
||
unsigned char unS2 = pW[nChar] >> 8;
|
||
unsigned char unS3 = pW[nChar];
|
||
pW[nChar] = ((Mult0e(unS0) ^ Mult0b(unS1) ^ Mult0d(unS2) ^ Mult09(unS3)) << 24)
|
||
| ((Mult09(unS0) ^ Mult0e(unS1) ^ Mult0b(unS2) ^ Mult0d(unS3)) << 16)
|
||
| ((Mult0d(unS0) ^ Mult09(unS1) ^ Mult0e(unS2) ^ Mult0b(unS3)) << 8)
|
||
| (Mult0b(unS0) ^ Mult0d(unS1) ^ Mult09(unS2) ^ Mult0e(unS3));
|
||
}
|
||
}
|
||
|
||
static inline void AddRoundKey(unsigned char *sState, unsigned int *pW)
|
||
{
|
||
for (int nChar = 0; nChar < 4; ++nChar)
|
||
{
|
||
sState[nChar + 0] ^= pW[nChar] >> 24;
|
||
sState[nChar + 4] ^= pW[nChar] >> 16;
|
||
sState[nChar + 8] ^= pW[nChar] >> 8;
|
||
sState[nChar + 12] ^= pW[nChar];
|
||
}
|
||
}
|
||
|
||
static void AESKeyExpansion(DecryptAESState *pState, unsigned char *sObjectKey, int nObjectKeyLen)
|
||
{
|
||
//Предполагается, что nObjectKeyLen == 16
|
||
|
||
for (int nIndex = 0; nIndex < 4; ++nIndex)
|
||
{
|
||
pState->arrW[nIndex] = (sObjectKey[4 * nIndex] << 24) + (sObjectKey[4 * nIndex + 1] << 16) + (sObjectKey[4 * nIndex + 2] << 8) + sObjectKey[4 * nIndex + 3];
|
||
}
|
||
for (int nIndex = 4; nIndex < 44; ++nIndex)
|
||
{
|
||
unsigned int unTemp = pState->arrW[nIndex - 1];
|
||
if (!(nIndex & 3))
|
||
{
|
||
unTemp = SubWord(RotWord(unTemp)) ^ c_arrRCon[nIndex / 4];
|
||
}
|
||
pState->arrW[nIndex] = pState->arrW[nIndex - 4] ^ unTemp;
|
||
}
|
||
for (int nRound = 1; nRound <= 9; ++nRound)
|
||
{
|
||
InvMixColumnsW(&pState->arrW[nRound * 4]);
|
||
}
|
||
}
|
||
|
||
static void AESDecryptBlock(DecryptAESState *pState, unsigned char *sIn, bool bLast)
|
||
{
|
||
// Начальное состояние
|
||
for (int nChar = 0; nChar < 4; ++nChar)
|
||
{
|
||
pState->sState[nChar + 0] = sIn[4 * nChar + 0];
|
||
pState->sState[nChar + 4] = sIn[4 * nChar + 1];
|
||
pState->sState[nChar + 8] = sIn[4 * nChar + 2];
|
||
pState->sState[nChar + 12] = sIn[4 * nChar + 3];
|
||
}
|
||
|
||
// Round 0
|
||
AddRoundKey(pState->sState, &pState->arrW[10 * 4]);
|
||
|
||
// Round 1-9
|
||
for (int nRound = 9; nRound >= 1; --nRound)
|
||
{
|
||
InvSubBytes(pState->sState);
|
||
InvShiftRows(pState->sState);
|
||
InvMixColumns(pState->sState);
|
||
AddRoundKey(pState->sState, &pState->arrW[nRound * 4]);
|
||
}
|
||
|
||
// Round 10
|
||
InvSubBytes(pState->sState);
|
||
InvShiftRows(pState->sState);
|
||
AddRoundKey(pState->sState, &pState->arrW[0]);
|
||
|
||
// CBC
|
||
for (int nChar = 0; nChar < 4; ++nChar)
|
||
{
|
||
pState->sBuffer[4 * nChar + 0] = pState->sState[nChar + 0] ^ pState->sCBC[4 * nChar + 0];
|
||
pState->sBuffer[4 * nChar + 1] = pState->sState[nChar + 4] ^ pState->sCBC[4 * nChar + 1];
|
||
pState->sBuffer[4 * nChar + 2] = pState->sState[nChar + 8] ^ pState->sCBC[4 * nChar + 2];
|
||
pState->sBuffer[4 * nChar + 3] = pState->sState[nChar + 12] ^ pState->sCBC[4 * nChar + 3];
|
||
}
|
||
|
||
// сохраняем блок с следующий CBC
|
||
for (int nIndex = 0; nIndex < 16; ++nIndex)
|
||
{
|
||
pState->sCBC[nIndex] = sIn[nIndex];
|
||
}
|
||
|
||
// remove padding
|
||
pState->nBufferIndex = 0;
|
||
if (bLast)
|
||
{
|
||
int nLen = pState->sBuffer[15];
|
||
for (int nIndex = 15; nIndex >= nLen; --nIndex)
|
||
{
|
||
pState->sBuffer[nIndex] = pState->sBuffer[nIndex - nLen];
|
||
}
|
||
pState->nBufferIndex = nLen;
|
||
}
|
||
}
|
||
|
||
//------------------------------------------------------------------------
|
||
// MD5 message digest
|
||
//------------------------------------------------------------------------
|
||
|
||
static inline unsigned long RotateLeft(unsigned long x, int r)
|
||
{
|
||
x &= 0xffffffff;
|
||
return ((x << r) | (x >> (32 - r))) & 0xffffffff;
|
||
}
|
||
|
||
static inline unsigned long MD5Round1(unsigned long a, unsigned long b, unsigned long c, unsigned long d, unsigned long Xk, unsigned long s, unsigned long Ti)
|
||
{
|
||
return b + RotateLeft((a + ((b & c) | (~b & d)) + Xk + Ti), s);
|
||
}
|
||
|
||
static inline unsigned long MD5Round2(unsigned long a, unsigned long b, unsigned long c, unsigned long d, unsigned long Xk, unsigned long s, unsigned long Ti)
|
||
{
|
||
return b + RotateLeft((a + ((b & d) | (c & ~d)) + Xk + Ti), s);
|
||
}
|
||
|
||
static inline unsigned long MD5Round3(unsigned long a, unsigned long b, unsigned long c, unsigned long d, unsigned long Xk, unsigned long s, unsigned long Ti)
|
||
{
|
||
return b + RotateLeft((a + (b ^ c ^ d) + Xk + Ti), s);
|
||
}
|
||
|
||
static inline unsigned long MD5Round4(unsigned long a, unsigned long b, unsigned long c, unsigned long d, unsigned long Xk, unsigned long s, unsigned long Ti)
|
||
{
|
||
return b + RotateLeft((a + (c ^ (b | ~d)) + Xk + Ti), s);
|
||
}
|
||
|
||
static void MD5(unsigned char *sMessage, int nMessageLen, unsigned char *sDigest)
|
||
{
|
||
unsigned long x[16];
|
||
unsigned long a, b, c, d, aa, bb, cc, dd;
|
||
int i, j, k;
|
||
|
||
// Вычислим количество блоков 64x64
|
||
// ( nMessageLen + pad byte (0x80) + 8 bytes for length )
|
||
int nBlocksCount = (nMessageLen + 1 + 8 + 63) / 64;
|
||
|
||
// Инициализируем a, b, c, d
|
||
a = 0x67452301;
|
||
b = 0xefcdab89;
|
||
c = 0x98badcfe;
|
||
d = 0x10325476;
|
||
|
||
k = 0;
|
||
for (i = 0; i < nBlocksCount; ++i)
|
||
{
|
||
// Считываем один блок
|
||
for (j = 0; j < 16 && k < nMessageLen - 3; ++j, k += 4)
|
||
x[j] = (((((sMessage[k + 3] << 8) + sMessage[k + 2]) << 8) + sMessage[k + 1]) << 8) + sMessage[k];
|
||
if (i == nBlocksCount - 1)
|
||
{
|
||
if (k == nMessageLen - 3)
|
||
x[j] = 0x80000000 + (((sMessage[k + 2] << 8) + sMessage[k + 1]) << 8) + sMessage[k];
|
||
else if (k == nMessageLen - 2)
|
||
x[j] = 0x800000 + (sMessage[k + 1] << 8) + sMessage[k];
|
||
else if (k == nMessageLen - 1)
|
||
x[j] = 0x8000 + sMessage[k];
|
||
else
|
||
x[j] = 0x80;
|
||
++j;
|
||
while (j < 16)
|
||
x[j++] = 0;
|
||
x[14] = nMessageLen << 3;
|
||
}
|
||
|
||
// Сохраняем a, b, c, d
|
||
aa = a;
|
||
bb = b;
|
||
cc = c;
|
||
dd = d;
|
||
|
||
// Round 1
|
||
a = MD5Round1(a, b, c, d, x[0], 7, 0xd76aa478);
|
||
d = MD5Round1(d, a, b, c, x[1], 12, 0xe8c7b756);
|
||
c = MD5Round1(c, d, a, b, x[2], 17, 0x242070db);
|
||
b = MD5Round1(b, c, d, a, x[3], 22, 0xc1bdceee);
|
||
a = MD5Round1(a, b, c, d, x[4], 7, 0xf57c0faf);
|
||
d = MD5Round1(d, a, b, c, x[5], 12, 0x4787c62a);
|
||
c = MD5Round1(c, d, a, b, x[6], 17, 0xa8304613);
|
||
b = MD5Round1(b, c, d, a, x[7], 22, 0xfd469501);
|
||
a = MD5Round1(a, b, c, d, x[8], 7, 0x698098d8);
|
||
d = MD5Round1(d, a, b, c, x[9], 12, 0x8b44f7af);
|
||
c = MD5Round1(c, d, a, b, x[10], 17, 0xffff5bb1);
|
||
b = MD5Round1(b, c, d, a, x[11], 22, 0x895cd7be);
|
||
a = MD5Round1(a, b, c, d, x[12], 7, 0x6b901122);
|
||
d = MD5Round1(d, a, b, c, x[13], 12, 0xfd987193);
|
||
c = MD5Round1(c, d, a, b, x[14], 17, 0xa679438e);
|
||
b = MD5Round1(b, c, d, a, x[15], 22, 0x49b40821);
|
||
|
||
// Round 2
|
||
a = MD5Round2(a, b, c, d, x[1], 5, 0xf61e2562);
|
||
d = MD5Round2(d, a, b, c, x[6], 9, 0xc040b340);
|
||
c = MD5Round2(c, d, a, b, x[11], 14, 0x265e5a51);
|
||
b = MD5Round2(b, c, d, a, x[0], 20, 0xe9b6c7aa);
|
||
a = MD5Round2(a, b, c, d, x[5], 5, 0xd62f105d);
|
||
d = MD5Round2(d, a, b, c, x[10], 9, 0x02441453);
|
||
c = MD5Round2(c, d, a, b, x[15], 14, 0xd8a1e681);
|
||
b = MD5Round2(b, c, d, a, x[4], 20, 0xe7d3fbc8);
|
||
a = MD5Round2(a, b, c, d, x[9], 5, 0x21e1cde6);
|
||
d = MD5Round2(d, a, b, c, x[14], 9, 0xc33707d6);
|
||
c = MD5Round2(c, d, a, b, x[3], 14, 0xf4d50d87);
|
||
b = MD5Round2(b, c, d, a, x[8], 20, 0x455a14ed);
|
||
a = MD5Round2(a, b, c, d, x[13], 5, 0xa9e3e905);
|
||
d = MD5Round2(d, a, b, c, x[2], 9, 0xfcefa3f8);
|
||
c = MD5Round2(c, d, a, b, x[7], 14, 0x676f02d9);
|
||
b = MD5Round2(b, c, d, a, x[12], 20, 0x8d2a4c8a);
|
||
|
||
// Round 3
|
||
a = MD5Round3(a, b, c, d, x[5], 4, 0xfffa3942);
|
||
d = MD5Round3(d, a, b, c, x[8], 11, 0x8771f681);
|
||
c = MD5Round3(c, d, a, b, x[11], 16, 0x6d9d6122);
|
||
b = MD5Round3(b, c, d, a, x[14], 23, 0xfde5380c);
|
||
a = MD5Round3(a, b, c, d, x[1], 4, 0xa4beea44);
|
||
d = MD5Round3(d, a, b, c, x[4], 11, 0x4bdecfa9);
|
||
c = MD5Round3(c, d, a, b, x[7], 16, 0xf6bb4b60);
|
||
b = MD5Round3(b, c, d, a, x[10], 23, 0xbebfbc70);
|
||
a = MD5Round3(a, b, c, d, x[13], 4, 0x289b7ec6);
|
||
d = MD5Round3(d, a, b, c, x[0], 11, 0xeaa127fa);
|
||
c = MD5Round3(c, d, a, b, x[3], 16, 0xd4ef3085);
|
||
b = MD5Round3(b, c, d, a, x[6], 23, 0x04881d05);
|
||
a = MD5Round3(a, b, c, d, x[9], 4, 0xd9d4d039);
|
||
d = MD5Round3(d, a, b, c, x[12], 11, 0xe6db99e5);
|
||
c = MD5Round3(c, d, a, b, x[15], 16, 0x1fa27cf8);
|
||
b = MD5Round3(b, c, d, a, x[2], 23, 0xc4ac5665);
|
||
|
||
// Round 4
|
||
a = MD5Round4(a, b, c, d, x[0], 6, 0xf4292244);
|
||
d = MD5Round4(d, a, b, c, x[7], 10, 0x432aff97);
|
||
c = MD5Round4(c, d, a, b, x[14], 15, 0xab9423a7);
|
||
b = MD5Round4(b, c, d, a, x[5], 21, 0xfc93a039);
|
||
a = MD5Round4(a, b, c, d, x[12], 6, 0x655b59c3);
|
||
d = MD5Round4(d, a, b, c, x[3], 10, 0x8f0ccc92);
|
||
c = MD5Round4(c, d, a, b, x[10], 15, 0xffeff47d);
|
||
b = MD5Round4(b, c, d, a, x[1], 21, 0x85845dd1);
|
||
a = MD5Round4(a, b, c, d, x[8], 6, 0x6fa87e4f);
|
||
d = MD5Round4(d, a, b, c, x[15], 10, 0xfe2ce6e0);
|
||
c = MD5Round4(c, d, a, b, x[6], 15, 0xa3014314);
|
||
b = MD5Round4(b, c, d, a, x[13], 21, 0x4e0811a1);
|
||
a = MD5Round4(a, b, c, d, x[4], 6, 0xf7537e82);
|
||
d = MD5Round4(d, a, b, c, x[11], 10, 0xbd3af235);
|
||
c = MD5Round4(c, d, a, b, x[2], 15, 0x2ad7d2bb);
|
||
b = MD5Round4(b, c, d, a, x[9], 21, 0xeb86d391);
|
||
|
||
// Увеличиваем a, b, c, d
|
||
a += aa;
|
||
b += bb;
|
||
c += cc;
|
||
d += dd;
|
||
}
|
||
|
||
// Разбиваем sDigest на байты
|
||
sDigest[0] = (unsigned char)(a & 0xff);
|
||
sDigest[1] = (unsigned char)((a >>= 8) & 0xff);
|
||
sDigest[2] = (unsigned char)((a >>= 8) & 0xff);
|
||
sDigest[3] = (unsigned char)((a >>= 8) & 0xff);
|
||
sDigest[4] = (unsigned char)(b & 0xff);
|
||
sDigest[5] = (unsigned char)((b >>= 8) & 0xff);
|
||
sDigest[6] = (unsigned char)((b >>= 8) & 0xff);
|
||
sDigest[7] = (unsigned char)((b >>= 8) & 0xff);
|
||
sDigest[8] = (unsigned char)(c & 0xff);
|
||
sDigest[9] = (unsigned char)((c >>= 8) & 0xff);
|
||
sDigest[10] = (unsigned char)((c >>= 8) & 0xff);
|
||
sDigest[11] = (unsigned char)((c >>= 8) & 0xff);
|
||
sDigest[12] = (unsigned char)(d & 0xff);
|
||
sDigest[13] = (unsigned char)((d >>= 8) & 0xff);
|
||
sDigest[14] = (unsigned char)((d >>= 8) & 0xff);
|
||
sDigest[15] = (unsigned char)((d >>= 8) & 0xff);
|
||
}
|
||
}
|