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134 lines
2.9 KiB
134 lines
2.9 KiB
#include "rar.hpp"
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#ifndef SFX_MODULE
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#include "crypt1.cpp"
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#include "crypt2.cpp"
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#endif
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#include "crypt3.cpp"
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#include "crypt5.cpp"
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CryptData::CryptData()
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{
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Method=CRYPT_NONE;
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KDF3CachePos=0;
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KDF5CachePos=0;
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memset(CRCTab,0,sizeof(CRCTab));
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}
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void CryptData::DecryptBlock(byte *Buf,size_t Size)
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{
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switch(Method)
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{
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#ifndef SFX_MODULE
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case CRYPT_RAR13:
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Decrypt13(Buf,Size);
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break;
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case CRYPT_RAR15:
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Crypt15(Buf,Size);
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break;
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case CRYPT_RAR20:
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for (size_t I=0;I<Size;I+=CRYPT_BLOCK_SIZE)
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DecryptBlock20(Buf+I);
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break;
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#endif
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case CRYPT_RAR30:
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case CRYPT_RAR50:
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rin.blockDecrypt(Buf,Size,Buf);
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break;
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}
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}
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bool CryptData::SetCryptKeys(bool Encrypt,CRYPT_METHOD Method,
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SecPassword *Password,const byte *Salt,
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const byte *InitV,uint Lg2Cnt,byte *HashKey,byte *PswCheck)
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{
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if (Method==CRYPT_NONE || !Password->IsSet())
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return false;
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CryptData::Method=Method;
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wchar PwdW[MAXPASSWORD];
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Password->Get(PwdW,ASIZE(PwdW));
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PwdW[Min(MAXPASSWORD_RAR,MAXPASSWORD)-1]=0; // For compatibility with existing archives.
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char PwdA[MAXPASSWORD];
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WideToChar(PwdW,PwdA,ASIZE(PwdA));
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PwdA[Min(MAXPASSWORD_RAR,MAXPASSWORD)-1]=0; // For compatibility with existing archives.
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switch(Method)
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{
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#ifndef SFX_MODULE
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case CRYPT_RAR13:
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SetKey13(PwdA);
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break;
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case CRYPT_RAR15:
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SetKey15(PwdA);
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break;
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case CRYPT_RAR20:
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SetKey20(PwdA);
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break;
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#endif
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case CRYPT_RAR30:
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SetKey30(Encrypt,Password,PwdW,Salt);
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break;
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case CRYPT_RAR50:
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SetKey50(Encrypt,Password,PwdW,Salt,InitV,Lg2Cnt,HashKey,PswCheck);
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break;
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}
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cleandata(PwdA,sizeof(PwdA));
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cleandata(PwdW,sizeof(PwdW));
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return true;
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}
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void CryptData::SetRijndalDecryptKey(byte *Key,byte *InitV)
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{
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CryptData::Method=CRYPT_RAR30;
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rin.Init(false,Key,128,InitV);
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}
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// Use the current system time to additionally randomize data.
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static void TimeRandomize(byte *RndBuf,size_t BufSize)
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{
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static uint Count=0;
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RarTime CurTime;
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CurTime.SetCurrentTime();
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uint64 Random=CurTime.GetWin()+clock();
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for (size_t I=0;I<BufSize;I++)
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{
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byte RndByte = byte (Random >> ( (I & 7) * 8 ));
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RndBuf[I]=byte( (RndByte ^ I) + Count++);
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}
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}
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// Fill buffer with random data.
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void GetRnd(byte *RndBuf,size_t BufSize)
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{
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bool Success=false;
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#if defined(_WIN_ALL)
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HCRYPTPROV hProvider = 0;
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if (CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
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{
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Success=CryptGenRandom(hProvider, (DWORD)BufSize, RndBuf) == TRUE;
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CryptReleaseContext(hProvider, 0);
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}
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#elif defined(_UNIX)
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FILE *rndf = fopen("/dev/urandom", "r");
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if (rndf!=NULL)
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{
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Success=fread(RndBuf, BufSize, 1, rndf) == BufSize;
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fclose(rndf);
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}
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#endif
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// We use this code only as the last resort if code above failed.
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if (!Success)
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TimeRandomize(RndBuf,BufSize);
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}
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