public string Unprotect(ContentFile contentFile, KeyFile keyFile)
{
_exception = null;
FileStream stream = null;
try
{
if (string.IsNullOrWhiteSpace(contentFile.FileName) || string.IsNullOrWhiteSpace(contentFile.FilePath))
{
throw new Exception("Invalid ContentFile");
}
if (string.IsNullOrWhiteSpace(keyFile.FileName) || string.IsNullOrWhiteSpace(keyFile.FilePath))
{
throw new Exception("Invalid KeyFile");
}
try
{
stream = File.OpenRead(keyFile.ToString());
}
catch (Exception ex)
{
_exception = ex;
return(string.Empty);
}
var tDesCsp = new TripleDESCryptoServiceProvider();
var br = new BinaryReader(stream);
tDesCsp.Key = br.ReadBytes(24);
tDesCsp.IV = br.ReadBytes(8);
stream = null;
try
{
stream = File.OpenRead(contentFile.ToString());
}
catch (Exception ex)
{
_exception = ex;
return(string.Empty);
}
var cs = new CryptoStream(stream, tDesCsp.CreateDecryptor(), CryptoStreamMode.Read);
var sr = new StreamReader(cs);
return(sr.ReadToEnd());
}
catch (Exception ex)
{
_exception = ex;
return(string.Empty);
}
finally
{
if (stream != null)
{
stream.Close();
stream.Dispose();
}
}
}
public OperationResults Protect(string text, ContentFile contentFile, KeyFile keyFile)
{
_exception = null;
FileStream stream = null;
try
{
if (string.IsNullOrWhiteSpace(text))
{
throw new Exception("Invalid text to protect");
}
if (string.IsNullOrWhiteSpace(contentFile.FileName) || string.IsNullOrWhiteSpace(contentFile.FilePath))
{
throw new Exception("Invalid ContentFile");
}
if (string.IsNullOrWhiteSpace(keyFile.FileName) || string.IsNullOrWhiteSpace(keyFile.FilePath))
{
throw new Exception("Invalid KeyFile");
}
try
{
stream = File.Create(contentFile.ToString());
}
catch (Exception ex)
{
_exception = ex;
return(OperationResults.Error);
}
var tDesCsp = new TripleDESCryptoServiceProvider();
var cs = new CryptoStream(stream, tDesCsp.CreateEncryptor(), CryptoStreamMode.Write);
var sw = new StreamWriter(cs);
sw.WriteLine(text);
sw.Flush();
sw.Close();
stream = null;
try
{
stream = File.Create(keyFile.ToString());
}
catch (Exception ex)
{
_exception = ex;
return(OperationResults.Error);
}
var bw = new BinaryWriter(stream);
bw.Write(tDesCsp.Key);
bw.Write(tDesCsp.IV);
bw.Flush();
bw.Close();
tDesCsp.Clear();
return(OperationResults.Protected);
}
catch (Exception ex)
{
_exception = ex;
return(OperationResults.Error);
}
finally
{
if (stream != null)
{
stream.Close();
stream.Dispose();
}
}
}