/// <summary>
/// Retrieves an AES 256 encrypted value from the configuration file.
/// </summary>
/// <param name="log">The event log to log exceptions to. May be null for no logging.</param>
/// <returns>The value or null if not found or it could not be decrypted.</returns>
protected string SecureGet(EventLog.EventLog log)
{
// Get the raw value of the encrypted string.
string value = Get(log);
// Decrypt the string if the raw value contains one.
if (!string.IsNullOrWhiteSpace(value))
{
// Get the encrypted string containing the key, initialization vector, value, and key and
// initialization vector lengths from the file.
// Read only the first line of the file, as this is all that is necessary for the encrypted
// format.
StringReader reader = new StringReader(Get(log));
string encryptedValue = reader.ReadLine();
// Check that an encrypted value was retrieved.
if (!string.IsNullOrWhiteSpace(encryptedValue))
{
// The encrypted value was retrieved.
// Decrypt the encrypted value.
return(AES256.DecryptConsolidatedString(encryptedValue));
}
}
// Could not retrieve the encrypted value.
return(null);
}