I am trying to pass 2 byte arrays to a file encryption function I wrote. However, when I do both arrays are truncated to size 8 (from size 16) thus causing the function to not work properly. I am not sure what I am doing wrong here since the function parameters are simply pointing to the byte arrays.
CryptoPP::AutoSeededRandomPool prng;
//Key generation
byte key[AES::DEFAULT_KEYLENGTH];
prng.GenerateBlock(key, sizeof(key));
//IV generation
byte iv[AES::BLOCKSIZE];
prng.GenerateBlock(iv, sizeof(iv));
//print key
encoded.clear();
StringSource(key, sizeof(key), true, new HexEncoder(new StringSink(encoded)));
cout << "key: " << encoded << endl;
cout << "Size of key: " << sizeof(key) << endl;
//print iv
encoded.clear();
StringSource(iv, sizeof(iv), true, new HexEncoder(new StringSink(encoded)));
cout << "iv: " << encoded << endl;
cout << "Size of iv: " << sizeof(iv) << endl;
//See function below
encrypt_file(inFile, outFile, key, iv, err);
inFile.close();
outFile.close();
Once in this function the bytes arrays are truncated for some reason
Encrypt_file
bool encrypt_file(std::ifstream& inFile,
std::ofstream& outFile,
const byte* key, const byte* iv,
std::string& errMsg)
{
std::string encoded;
//print key
encoded.clear();
StringSource(key, sizeof(key), true, new HexEncoder(new StringSink(encoded)));
cout << "key: " << encoded << endl;
cout << "Size of key: " << sizeof(key) << endl;
//print iv
encoded.clear();
StringSource(iv, sizeof(iv), true, new HexEncoder(new StringSink(encoded)));
cout << "iv: " << encoded << endl;
cout << "Size of iv: " << sizeof(iv) << endl;
try {
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption e;
e.SetKeyWithIV(key, sizeof(key), iv);
CryptoPP::FileSource(inFile, true, new CryptoPP::StreamTransformationFilter(e, new CryptoPP::FileSink(outFile)));
inFile.close();
outFile.close();
}
catch (CryptoPP::Exception& e) {
errMsg = e.GetWhat();
return false;
}
return true;
}
Output:
key: 6574D7BDFD0DD3BC59CD3846D4A196A8
Size of key: 16
iv: 1B4ED692F91A32246B41F63F6B8C6EAA
Size of iv: 16
key: 6574D7BDFD0DD3BC
Size of key: 8
iv: 1B4ED692F91A3224
Size of iv: 8