| public GenerateBinaryImage ( byte buffer, int startIndex ) : int | ||
| buffer | byte | Buffer used to hold generated binary image of the source object. |
| startIndex | int | 0-based starting index in the |
| return | int | |
public int GenerateBinaryImage(byte[] buffer, int startIndex)
{
int length = BinaryLength;
buffer.ValidateParameters(startIndex, length);
// Populate the buffer
buffer[startIndex] = Convert.ToByte(m_type);
buffer[startIndex + 1] = m_identifier;
Buffer.BlockCopy(EndianOrder.GetBytes((ushort)BinaryLength), 0, buffer, startIndex + 2, 2);
Buffer.BlockCopy(m_authenticator, 0, buffer, startIndex + 4, m_authenticator.Length);
startIndex += 20;
foreach (RadiusPacketAttribute attribute in m_attributes)
{
if (attribute != null)
startIndex += attribute.GenerateBinaryImage(buffer, startIndex);
}
return length;
}
/// <summary>
/// Generates an "Authenticator" value used in a RADIUS response packet sent by the server to client.
/// </summary>
/// <param name="sharedSecret">The shared secret key.</param>
/// <param name="requestPacket">RADIUS packet sent from client to server.</param>
/// <param name="responsePacket">RADIUS packet sent from server to client.</param>
/// <returns>A byte array.</returns>
public static byte[] CreateResponseAuthenticator(string sharedSecret, RadiusPacket requestPacket, RadiusPacket responsePacket)
{
// Response authenticator is generated as follows:
// MD5(Code + Identifier + Length + Request Authenticator + Attributes + Shared Secret)
// where:
// Code, Identifier, Length & Attributes are from the response RADIUS packet
// Request Authenticator is from the request RADIUS packet
// Shared Secret is the shared secret key
int length = responsePacket.BinaryLength;
byte[] sharedSecretBytes = Encoding.GetBytes(sharedSecret);
byte[] buffer = new byte[length + sharedSecretBytes.Length];
responsePacket.GenerateBinaryImage(buffer, 0);
Buffer.BlockCopy(requestPacket.BinaryImage(), 4, buffer, 4, 16);
Buffer.BlockCopy(sharedSecretBytes, 0, buffer, length, sharedSecretBytes.Length);
return(new MD5CryptoServiceProvider().ComputeHash(buffer));
}
