public static WriteMessageDto EncodeMessage(string message, ChatDto chat)
{
UserChatKeys keys = GetChatKeys(chat);
ICollection <EncodedMessageDto> encodedMessages = new List <EncodedMessageDto>();
foreach (MemberDto member in chat.Members)
{
int commonKey = DIFFIE.GetCommonPrivateKey(member.PublicKey, keys.PrivateKey, keys.Chat.P);
Console.WriteLine($"***Encoded for {member.Name} with key {commonKey}***");
string encodedMessage = NOTEPAD.Encode(message, commonKey);
encodedMessages.Add(new EncodedMessageDto(encodedMessage, member.Name));
}
return(new WriteMessageDto(chat.Name, LOGIN, encodedMessages));
}
public static IEnumerable <DecodedMessage> DecodeChat(ChatDto chat)
{
UserChatKeys keys = GetChatKeys(chat);
ICollection <DecodedMessage> messages = new List <DecodedMessage>();
foreach (MessageDto encodedMessage in chat.Messages)
{
if (encodedMessage.EncodedText == "******")
{
messages.Add(new DecodedMessage(encodedMessage.EncodedText, encodedMessage.Sender.Name, encodedMessage.TimeSpan, null));
continue;
}
int commonKey = DIFFIE.GetCommonPrivateKey(encodedMessage.Sender.PublicKey, keys.PrivateKey, keys.Chat.P);
string decodedMessage = NOTEPAD.GetCodeText(NOTEPAD.Decode(encodedMessage.EncodedText, commonKey));
messages.Add(new DecodedMessage(decodedMessage, encodedMessage.Sender.Name, encodedMessage.TimeSpan, commonKey));
}
return(messages);
}
