// ClientCDKey::CreateSymmetricKey
// Creates a symmetric key from product name used to save/load CD-Key to/from
// the registry.  Symmetric key is created via a series of CRCs on the product.
void
ClientCDKey::CreateSymmetricKey(BFSymmetricKey& theSymKeyR) const
{
	WTRACE("ClientCDKey::CreateSymmetricKey");
	WDBG_LL("ClientCDKey::CreateSymmetricKey from product=" << mProduct);
	CRC16     aCRC;
	RawBuffer aBuf;

	// CRC the product and use it as 1st 2 bytes of key
	aCRC.Put(mProduct);
	unsigned short aCheckSum = aCRC.GetCRC();
	WDBG_LL("ClientCDKey::CreateSymmetricKey First CRC=" << aCheckSum);
	aBuf.assign(reinterpret_cast<unsigned char*>(&aCheckSum), sizeof(aCheckSum));

	// CRC each of 1st 3 chars of product and add them to key.
	for (int i=0; (i < 3) && (i < mProduct.size()); i++)
	{
		aCRC.Put(static_cast<unsigned char>(mProduct[i]));
		aCheckSum = aCRC.GetCRC();
		WDBG_LL("ClientCDKey::CreateSymmetricKey Add CRC=" << aCheckSum);
		aBuf.append(reinterpret_cast<unsigned char*>(&aCheckSum), sizeof(aCheckSum));
	}

	// Create the key
	WDBG_LL("ClientCDKey::CreateSymmetricKey Buf=" << aBuf);
	theSymKeyR.Create(aBuf.size(), aBuf.data());
}
Example #2
0
void AuthContext::AppendHashes(WriteBuffer &theBuf, const RawBuffer &theChallengeSeed)
{
	AutoCrit aCrit(mDataCrit);

	int aNumHashes = 0;
	int aNumHashPos = theBuf.length();
	theBuf.SkipBytes(1); // put num hashes here

	AuthLoginCommunityMap::iterator anItr = mCommunityMap.begin();
	while(anItr!=mCommunityMap.end())
	{
		AuthLoginCommunityData &aData = anItr->second;
		if(!aData.mSimpleHash.empty())
		{
			MD5Digest aKeyedHash;
			aKeyedHash.update(theChallengeSeed);
			aKeyedHash.update(aData.mKeyedHashData);
			RawBuffer aKeyedHashBuf = aKeyedHash.digest();		
	

			theBuf.AppendByte(1); // hash tag
			theBuf.AppendWString(anItr->first); // community
			theBuf.AppendBytes(aData.mSimpleHash.data(),aData.mSimpleHash.length());
			theBuf.AppendBytes(aKeyedHashBuf.data(),aKeyedHashBuf.length());
			aNumHashes++;
		}

		++anItr;
	}

	theBuf.SetByte(aNumHashPos,aNumHashes);
}
EGPublicKey::CryptReturn EGPublicKey::Encrypt(const void* theMsgP, unsigned long theLen) const
{
	if ((! theMsgP) || (theLen == 0))
	{
		return CryptReturn(NULL,0);
	}


	RawBuffer anEncrypt;
	if(!mElGamal.encrypt(theMsgP,theLen,anEncrypt))
		return CryptReturn(NULL,0);

	unsigned char *anOutP = new unsigned char[anEncrypt.length()];
	memcpy(anOutP,anEncrypt.data(),anEncrypt.length());

	return CryptReturn(anOutP,anEncrypt.length());
}
Example #4
0
bool ElGamal::EncodeDigest(const RawBuffer& digest, BigInteger &h) const
{
    IntegerExtractor aDecoder(digest.data(),digest.length(),false);
    if(digest.length()*8 < q.bitLength())
    {
        if(!aDecoder.Decode(digest.length(),h))
            return false;
    }
    else
    {
        if(!aDecoder.Decode(q.byteLength(),h))
            return false;

        h = h.shiftRight(q.byteLength()*8 - q.bitLength() + 1);
    }

    return true;
}
Example #5
0
bool AuthContext::LoadVerifierKey(const std::string &theFile)
{
	mCheckedVerifierFile = true;

	FILE *aFile = fopen(theFile.c_str(),"rb");
	if(aFile==NULL)
		return false;

	unsigned char aBuf[1024];
	RawBuffer aKeyBuf;
	while(!feof(aFile))
	{
		int aNumRead = fread(aBuf,1,1024,aFile);
		if(aNumRead>0)
			aKeyBuf.append(aBuf,aNumRead);
	
	}

	fclose(aFile);
	
	AutoCrit aCrit(GetVerifierCrit());
	return mVerifierKey.SetPublicKey(aKeyBuf.data(),aKeyBuf.length());
}
Example #6
0
ByteBufferPtr ElGamal::Decrypt(const void *theCipherText, int theCipherTextLen) const
{
    if(!IsPrivate())
        return NULL;

    const unsigned char *in = (const unsigned char*)theCipherText;
    int inOffset = 0;

    if(theCipherTextLen-inOffset<4) return NULL;
    int aNumBlocks = LongFromLittleEndian(*(int*)in);
    inOffset+=4;

    if(theCipherTextLen-inOffset < aNumBlocks*modulusLen*2-inOffset)
        return NULL;

    RawBuffer aBuf(modulusLen,(unsigned char)0);
    RawBuffer bBuf(modulusLen,(unsigned char)0);

    WriteBuffer aDecrypt;

    BigInteger a;;
    BigInteger b;

    BigInteger aPlainText;

    for(int i=0; i<aNumBlocks; i++)
    {
        aBuf.assign(in+inOffset,modulusLen);
        inOffset+=modulusLen;
        bBuf.assign(in+inOffset,modulusLen);
        inOffset+=modulusLen;

        a.fromBinary(aBuf);
        b.fromBinary(bBuf);

        if(!decrypt(a,b,aPlainText))
            return NULL;

        RawBuffer aBigIntArray;
        aPlainText.toBinary(aBigIntArray);


        if(aBigIntArray.length()==0) return NULL;
        int aPlainLen = aBigIntArray[aBigIntArray.length() - 1];

        if(aPlainLen>modulusLen - 3)
            return NULL;

        if(aBigIntArray.length() - 1 - aPlainLen < 0)
        {
            int extra = aPlainLen - (aBigIntArray.length() - 1);
            for(int j=0; j<extra; j++)
                aDecrypt.AppendByte(0);

            aDecrypt.AppendBytes(aBigIntArray.data(),aBigIntArray.length());
        }
        else
            aDecrypt.AppendBytes(aBigIntArray.data()+aBigIntArray.length()-1-aPlainLen,aPlainLen);
    }

    return aDecrypt.ToByteBuffer();
}