//ENCRYPTEER DATA
//original = te encrypteren data
public EncryptedPacket EncryptData(byte[] original, RSAWithRSAParameterKey rsaParams)
{
//Genereert session key
byte[] sessionKey = aes.GenerateRandomNumber(32);
//Maakt encryptedPacket en genereert iv
EncryptedPacket encryptedPacket = new EncryptedPacket {
iv = aes.GenerateRandomNumber(16)
};
//Encrypteert data met AES-sleutel
encryptedPacket.encryptedData = aes.Encrypt(original, sessionKey, encryptedPacket.iv); //Session key en IV gebruiken voor encryptie van data
//Encrypteert de session key met RSA
encryptedPacket.encryptedSessionKey = rsaParams.EncryptData(sessionKey);
return(encryptedPacket);
}
//GELADE FILE ENCRYPTEREN, HASHEN EN VERSTUREN
private void btnEncrypt_Click(object sender, EventArgs e)
{
//Gelade file omzetten naar byte-array
byte[] dataToEncrypt = File.ReadAllBytes(loadedFilename);
//Objecten aanmaken die gebruikt moeten worden
RSAWithRSAParameterKey rsaParams = new RSAWithRSAParameterKey();
HybridEncryption hybrid = new HybridEncryption();
//Filename voor encrypted data maken
int startIndex = loadedFilename.LastIndexOf(@"\") + 1;
string folderReceiver = Application.StartupPath + @"\Users\" + receiver + @"\Inbox\";
string encryptedFilename = folderReceiver + "Encr_From" + username + "_" + loadedFilename.Substring(startIndex);
//ZOWEL DE DATA-, SESSION KEY- EN IV-FILE WORDEN HIERONDER GEHAALD UIT HET ENCRYPTEDPACK
//Data wordt geencrypteerd + in Inbox van receiver geplaatst
EncryptedPacket encryptedBlock = hybrid.EncryptData(dataToEncrypt, rsaParams);
File.WriteAllBytes(encryptedFilename, encryptedBlock.encryptedData);
//Filename voor session key maken
string keyFilename = Application.StartupPath + @"\Users\" + receiver + @"\Cryptodata\" + "Encrypted Session Key";
File.WriteAllBytes(keyFilename, encryptedBlock.encryptedSessionKey);
//Filename voor iv maken
string ivFilename = Application.StartupPath + @"\Users\" + receiver + @"\Cryptodata\" + "IV";
File.WriteAllBytes(ivFilename, encryptedBlock.iv);
//Hash maken van de oorspronkelijke file
hashedMessage = Hash.ToMD5Hash(File.ReadAllText(loadedFilename));
//Hash encrypteren
EncryptHash(hashedMessage);
MessageBox.Show($"You have successfully signed, encrypted and sent the file to {receiver}!", "Succesfully hashed, encrypted and sent!");
}
