/// <summary>Initializes a new instance of the <see cref="SCPdu"/> structure.</summary>
/// <param name="chatID">The field representing the chat ID.</param>
/// <param name="type">The field representing the PDU type.</param>
/// <param name="encoding">The field representing the character encoding used in the payload of this PDU.</param>
/// <param name="payload">The field representing the non-encrypted binary content of this PDU (calculated accordingly to the encoding).</param>
public SCPdu(string chatID, SCPduType type, Encoding encoding, byte[] payload)
{
this.chatID = chatID;
this.type = type;
this.payload = payload;
this.encoding = encoding;
}
/// <summary>Encrypts this PDU and provides its binary representation.</summary>
/// <param name="key">The encryption key to be used.</param>
/// <returns>The binary representation of the PDU to be sent through the network.</returns>
public byte[] ToBinary(byte[] key)
{
if (key.Length != 16)
{
throw new ScedaException("A SCEDA key must be 16 bytes long.");
}
string type;
switch (this.Type)
{
case SCPduType.Hello:
type = "HLO";
break;
case SCPduType.Welcome:
type = "ACK";
break;
case SCPduType.Leave:
type = "LEV";
break;
case SCPduType.Message:
type = "MSG";
break;
case SCPduType.MalformedPduNotification:
type = "BAD";
break;
case SCPduType.NicknameConflictNotification:
type = "CNF";
break;
default:
type = "";
break;
}
byte[] iv = SCEDA.GenerateIV();
return((new byte[] { 0, 1 }).Concat(Encoding.ASCII.GetBytes(this.ChatID + '\0')).Concat(iv).Concat(SCEDA.Encrypt(Encoding.ASCII.GetBytes(type).Concat(Encoding.ASCII.GetBytes(this.Encoding.BodyName + '\0')).Concat(this.Payload).ToArray(), key, iv)).ToArray());
}
/// <summary>Encrypts this PDU and provides its binary representation.</summary>
/// <param name="key">The encryption key to be used.</param>
/// <returns>The binary representation of the PDU to be sent through the network.</returns>
public byte[] ToBinary(byte[] key)
{
if (key.Length != 16)
{
throw new ScedaException("A SCEDA key must be 16 bytes long.");
}
string type;
switch (this.Type)
{
case SCPduType.Hello:
type = "HLO";
break;
case SCPduType.Welcome:
type = "ACK";
break;
case SCPduType.Leave:
type = "LEV";
break;
case SCPduType.Message:
type = "MSG";
break;
case SCPduType.MalformedPduNotification:
type = "BAD";
break;
case SCPduType.NicknameConflictNotification:
type = "CNF";
break;
default:
type = "";
break;
}
byte[] iv = SCEDA.GenerateIV();
return (new byte[] { 0, 1 }).Concat(Encoding.ASCII.GetBytes(this.ChatID + '\0')).Concat(iv).Concat(SCEDA.Encrypt(Encoding.ASCII.GetBytes(type).Concat(Encoding.ASCII.GetBytes(this.Encoding.BodyName + '\0')).Concat(this.Payload).ToArray(), key, iv)).ToArray();
}
/// <summary>Initializes a new instance of the <see cref="SCPdu"/> structure.</summary>
/// <param name="chatID">The field representing the chat ID.</param>
/// <param name="type">The field representing the PDU type.</param>
/// <param name="encoding">The field representing the character encoding used in the payload of this PDU.</param>
/// <param name="payload">The field representing the non-encrypted binary content of this PDU (calculated accordingly to the encoding).</param>
public SCPdu(string chatID, SCPduType type, Encoding encoding, byte[] payload)
{
this.chatID = chatID;
this.type = type;
this.payload = payload;
this.encoding = encoding;
}
