XEX3 in CTR mode Decryption doesn't work?

[kazuhiko]

Hi All.

Im using cryptpp 5.5.2
Compiler: Borland(R) C++Builder(R) for Microsoft(R) WindowsTM Version
10.0.2288.42451 Update 2
OS: WindowsXP home sp2
Language: Japanese

The following codes do not work.


void CTR_XEX3_24Encode(std::istream &inStream, std::ofstream
&outStream){
        const std::string Key = "abcdefghijklmnopqrstuvwx";
        const int KeyLength = 24;
        const std::string iv  = "12345678";

        CTR_Mode<DES_XEX3>::Encryption ctrEncryption((const
byte*)Key.c_str(), KeyLength, (const byte*)iv.c_str());
        StreamTransformationFilter *encryptor = new
StreamTransformationFilter(ctrEncryption, new FileSink(outStream));
        FileSource((std::istream &)inStream, true, encryptor);
};

void CTR_XEX3_24Decode(std::istream &inStream, std::ofstream
&outStream){
        const std::string Key = "abcdefghijklmnopqrstuvwx";
        const int KeyLength = 24;
        const std::string iv  = "12345678";

        CTR_Mode<DES_XEX3>::Decryption ctrDecryption((const
byte*)Key.c_str(), KeyLength, (const byte*)iv.c_str());
        StreamTransformationFilter *decryptor = new
StreamTransformationFilter(ctrDecryption, new FileSink(outStream));

        FileSource((std::istream &)inStream, true, decryptor); //here! but it
works when the input size is less than 16.
};

int main()
{
        std::istringstream source("");
        std::ifstream inStream;
        std::ofstream outStream;

        std::string DecodedPath = "c:/dec";
        source.str("abcdefghijklmnopqrstuvwxyz");//input size is 26.
        outStream.open("c:/enc");

        CTR_XEX3_24Encode(source, outStream);

        inStream.open("c:/enc");
        outStream.close();
        outStream.open("c:/dec");
        CTR_XEX3_24Decode(inStream, outStream);
}
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