extern uint CRCTab[256];

void CryptData::SetKey13(const char *Password)

{

  Key13[0]=Key13[1]=Key13[2]=0;

  for (size_t I=0;Password[I]!=0;I++)

  {

    byte P=Password[I];

    Key13[0]+=P;

    Key13[1]^=P;

    Key13[2]+=P;

    Key13[2]=(byte)rotls(Key13[2],1,8);

  }

}

void CryptData::SetKey15(const char *Password)

{

  InitCRC32(CRCTab);

  uint PswCRC=CRC32(0xffffffff,Password,strlen(Password));

  Key15[0]=PswCRC&0xffff;

  Key15[1]=(PswCRC>>16)&0xffff;

  Key15[2]=Key15[3]=0;

  for (size_t I=0;Password[I]!=0;I++)

  {

    byte P=Password[I];

    Key15[2]^=P^CRCTab[P];

    Key15[3]+=P+(CRCTab[P]>>16);

  }

}

void CryptData::SetAV15Encryption()

{

  InitCRC32(CRCTab);

  Method=CRYPT_RAR15;

  Key15[0]=0x4765;

  Key15[1]=0x9021;

  Key15[2]=0x7382;

  Key15[3]=0x5215;

}

void CryptData::SetCmt13Encryption()

{

  Method=CRYPT_RAR13;

  Key13[0]=0;

  Key13[1]=7;

  Key13[2]=77;

}

void CryptData::Decrypt13(byte *Data,size_t Count)

{

  while (Count--)

  {

    Key13[1]+=Key13[2];

    Key13[0]+=Key13[1];

    *Data-=Key13[0];

    Data++;

  }

}

void CryptData::Crypt15(byte *Data,size_t Count)

{

  while (Count--)

  {

    Key15[0]+=0x1234;

    Key15[1]^=CRCTab[(Key15[0] & 0x1fe)>>1];

    Key15[2]-=CRCTab[(Key15[0] & 0x1fe)>>1]>>16;

    Key15[0]^=Key15[2];

    Key15[3]=rotrs(Key15[3]&0xffff,1,16)^Key15[1];

    Key15[3]=rotrs(Key15[3]&0xffff,1,16);

    Key15[0]^=Key15[3];

    *Data^=(byte)(Key15[0]>>8);

    Data++;

  }

}