/// <summary>
/// The exchange key.
/// </summary>
/// <param name="requesterDetails">
/// The requester details.
/// </param>
/// <param name="ntruKey">
/// The contact information.
/// </param>
/// <param name="chatPasSalt">
/// The chat Pas Salt.
/// </param>
/// <returns>
/// The <see cref="Task"/>.
/// </returns>
protected async Task ExchangeKey(Contact requesterDetails, IAsymmetricKey ntruKey, string chatPasSalt)
{
var encryptedChatPasSalt = new NtruKeyExchange(NTRUParamSets.NTRUParamNames.A2011743).Encrypt(ntruKey, Encoding.UTF8.GetBytes(chatPasSalt));
await this.Messenger.SendMessageAsync(
new Message(
MessageType.KeyExchange,
new TryteString(encryptedChatPasSalt.EncodeBytesAsString() + Constants.End),
new Address(requesterDetails.ChatKeyAddress)));
}
/// <inheritdoc />
public async Task <AddContactResponse> ExecuteAsync(AddContactRequest request)
{
try
{
var contactInformation = await this.Repository.LoadContactInformationByAddressAsync(request.ContactAddress);
var requesterDetails = new Contact
{
ChatAddress = Seed.Random().ToString(),
ChatKeyAddress = Seed.Random().ToString(),
Name = request.Name,
ImageHash = request.ImageHash,
ContactAddress = request.RequestAddress.Value,
Request = true,
Rejected = false,
NtruKey = null,
PublicKeyAddress = request.PublicKeyAddress.Value
};
await this.Messenger.SendMessageAsync(
new Message(MessageType.RequestContact, TryteString.FromUtf8String(JsonConvert.SerializeObject(requesterDetails)), contactInformation.ContactAddress));
var encryptedChatPasSalt = new NtruKeyExchange(NTRUParamSets.NTRUParamNames.A2011743).Encrypt(
contactInformation.NtruKey,
Encoding.UTF8.GetBytes(Seed.Random() + Seed.Random().ToString().Substring(0, 20)));
await this.Messenger.SendMessageAsync(
new Message(
MessageType.KeyExchange,
new TryteString(encryptedChatPasSalt.EncodeBytesAsString() + Constants.End),
new Address(requesterDetails.ChatKeyAddress)));
await this.Repository.AddContactAsync(requesterDetails.ChatAddress, true, requesterDetails.PublicKeyAddress);
return(new AddContactResponse {
Code = ResponseCode.Success
});
}
catch (MessengerException exception)
{
return(new AddContactResponse {
Code = exception.Code
});
}
catch (Exception)
{
return(new AddContactResponse {
Code = ResponseCode.UnkownException
});
}
}