protected override void Dispose(bool disposing)
{
if (!m_disposed)
{
// note: we ALWAYS zeroize keys (disposing or not)
// clear our copy of the secret key
if (KeyValue != null)
{
Array.Clear(KeyValue, 0, KeyValue.Length);
}
// clear the secret key (inside TripleDES)
if (tdes != null)
{
tdes.Clear();
}
if (disposing)
{
// disposed managed stuff
KeyValue = null;
tdes = null;
}
// ancestor
base.Dispose(disposing);
m_disposed = true;
}
}
public bool Decrypt(ref string value)
{
Byte[] tmp = Convert.FromBase64String(value);
string result = string.Empty;
System.Security.Cryptography.TripleDES tripleDES = System.Security.Cryptography.TripleDES.Create();
ICryptoTransform decryptor = tripleDES.CreateDecryptor(key, iv);
using (MemoryStream ms = new MemoryStream(tmp)) {
try {
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) {
StreamReader reader = new StreamReader(cs);
result = reader.ReadLine();
}
} catch (System.Security.Cryptography.CryptographicException ex) {
value = ex.Message;
return(false);
}
}
tripleDES.Clear();
value = result;
return(true);
}
// IDisposable methods
protected override void Dispose(bool disposing)
{
if (disposing)
{
// dispose of our internal state
if (des != null)
{
des.Clear();
}
if (m_encryptor != null)
{
m_encryptor.Dispose();
}
if (_cs != null)
{
_cs.Clear();
}
if (_ts != null)
{
_ts.Clear();
}
}
base.Dispose(disposing);
}
