/// <summary>
/// Decrypts the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="parameters">The parameters.</param>
/// <returns></returns>
public ISnmpData Decrypt(ISnmpData data, SecurityParameters parameters)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var code = data.TypeCode;
if (code != SnmpType.OctetString)
{
throw new ArgumentException($"Cannot decrypt the scope data: {code}.", nameof(data));
}
var octets = (OctetString)data;
var bytes = octets.GetRaw();
var pkey = PasswordToKey(_phrase.GetRaw(), parameters.EngineId.GetRaw());
try
{
// decode encrypted packet
var decrypted = Decrypt(bytes, pkey, parameters.PrivacyParameters.GetRaw());
var result = DataFactory.CreateSnmpData(decrypted);
if (result.TypeCode != SnmpType.Sequence)
{
var newException = new DecryptionException("DES decryption failed");
newException.SetBytes(bytes);
throw newException;
}
return(result);
}
catch (Exception ex)
{
var newException = new DecryptionException("DES decryption failed", ex);
newException.SetBytes(bytes);
throw newException;
}
}
/// <summary>
/// Decrypts the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="parameters">The parameters.</param>
/// <returns></returns>
public ISnmpData Decrypt(ISnmpData data, SecurityParameters parameters)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (data.TypeCode != SnmpType.Sequence)
{
var newException = new DecryptionException("Default decryption failed");
throw newException;
}
return(data);
}