public string Load(FileData fileData)
{
Filestream = new FileStream(fileData.FileName, FileMode.Open);
EncryptorFactory = new EncryptorFactory(fileData.EncryptionType, fileData.Password, Filestream);
StreamReader streamReader = new StreamReader(EncryptorFactory.Decrypt());
string message = streamReader.ReadToEnd();
// Pull Hash out of message
string delimiter = "(?<=[\n])";
string[] plaintext = Regex.Split(message, @delimiter);
message = "";
for (int i = 0; i < plaintext.Length - 1; i++)
{
message += plaintext[i];
}
// Hash message
CreateHash(fileData.HashType);
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] input = encoder.GetBytes(message);
byte[] output = Hash.ComputeHash(input);
// Turn hash into string
string[] msghash = plaintext[plaintext.Length - 1].Split(new char[] { '\0' });
string originalhash = Convert.ToBase64String(output);
if (msghash[0] != originalhash)
{
throw new Exception("Access Denied!");
}
// Display or return results
return message;
}
public void Save(FileData fileData)
{
using (Filestream = new FileStream(fileData.FileName, FileMode.Create))
{
EncryptorFactory = new EncryptorFactory(fileData.EncryptionType, fileData.Password, Filestream);
// Hash message
CreateHash(fileData.HashType);
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] input = encoder.GetBytes(fileData.Message);
byte[] output = Hash.ComputeHash(input);
// Turn hash into string
string s = Convert.ToBase64String(output);
// Append hash to message
fileData.Message += s;
using (StreamWriter streamWriter = new StreamWriter(EncryptorFactory.Encrypt(Filestream)))
{
// Write message to file and close the stream
streamWriter.Write(fileData.Message);
}
}
}
