internal ResponseEncryptAES EncryptMessage(string mensaje)
{
ResponseEncryptAES response = new ResponseEncryptAES {
result = false
};
byte[] encryptedMessage;
//Inicia proceso para cifrado
FileWriter.WriteOnEvents(EventLevel.Info, "Iniciando proceso de cifrado.");
try
{
if (aes.Key == null || aes.IV == null || mensaje == "")
{
FileWriter.WriteOnEvents(EventLevel.Error, "Uno o mas de los argumentos para cifrado aes invalidos.");
}
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
using (MemoryStream msEncrypt = new MemoryStream()){
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)){
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt)){
//write the message to the stream
FileWriter.WriteOnEvents(EventLevel.Info, "Escribiendo mensaje en el bloque de flujo.");
swEncrypt.Write(mensaje);
}
encryptedMessage = msEncrypt.ToArray();
response.encryptedData = encryptedMessage;
response.result = true;
response.privateKey = aes.Key;
response.InitVector = aes.IV;
}
}
}
catch (System.Exception ex)
{
FileWriter.WriteOnEvents(EventLevel.Exception, "Excepcion en intento de cifrado. " + ex.Message);
}
return(response);
}
public IActionResult EncryptMessage(InteractionModel interactModel)
{
//Generate url's file
string filePublicKey = parameters.Value.FilesOutput + parameters.Value.PubKeyFile + interactModel.userNameDestination + interactModel.userNameOrigin;
//Initialize models and classes
SendMessageModel sendFirstMessage = new SendMessageModel();
RSAEncryption rsaEncrypt = new RSAEncryption();
RSASigning rsaSigning = new RSASigning(interactModel.userNameDestination + interactModel.userNameOrigin);
AESEncryption aesEncryption = new AESEncryption(parameters.Value.KeyAESSize);
ResponseSignData responseSign = new ResponseSignData();
ResponseSignData responseSignId = new ResponseSignData();
ResponseEncryptAES responseAES = new ResponseEncryptAES();
ResponseEncryptAESKey responseAESKey = new ResponseEncryptAESKey();
// Looking for partner RSA public key
if (rsaEncrypt.KeysPartnerExists(interactModel.userNameDestination + interactModel.userNameOrigin, filePublicKey))
{
FileWriter.WriteOnEvents(EventLevel.Info, "Llaves RSA para cifrado encontradas.");
FileWriter.WriteOnEvents(EventLevel.Info, "Iniciando firmado de mensaje.");
//Sign data with RSA Private Key
responseSign = rsaSigning.signData(interactModel.mensaje);
if (responseSign.result)
{
//Encrypt Message
if (aesEncryption.generateProperties())
{
responseAES = aesEncryption.EncryptMessage(interactModel.mensaje);
if (!responseAES.result)
{
FileWriter.WriteOnEvents(EventLevel.Error, "Error en el proceso de cifrado de mensaje, verifique los eventos previos.");
return(BadRequest(sendFirstMessage));
}
}
}
else
{
FileWriter.WriteOnEvents(EventLevel.Error, "Falla en intento de firma de mensaje, verificar logs anteriores.");
return(BadRequest(sendFirstMessage));
}
}
else
{
FileWriter.WriteOnEvents(EventLevel.Error,
"Imposible cifrar mensaje, llaves RSA para origen:" +
interactModel.userNameOrigin + "\tdestino:" + interactModel.userNameDestination + " no encontradas");
return(BadRequest(sendFirstMessage));
}
//Encrypt AES Key
if (responseAES.privateKey != null)
{
FileWriter.WriteOnEvents(EventLevel.Info, "Iniciando proceso de cifrado llaves AES con RSA");
responseAESKey = rsaEncrypt.EncryptAESKey(responseAES.privateKey, filePublicKey);
}
else
{
FileWriter.WriteOnEvents(EventLevel.Error, "Error en cifrado llave AES con RSA, no existe la llave de AES.");
return(BadRequest(sendFirstMessage));
}
//Generate de sign for server identification
//responseSignId = rsaSigning.signData(interactModel.userNameOrigin+interactModel.userNameDestination);
//if(!responseSignId.result){
// FileWriter.WriteOnEvents(EventLevel.Error,"Falla en intento de firma de identificacion contra servidor, verificar logs anteriores.");
// return BadRequest(sendFirstMessage);
// }
//Call the server service and send the data model
//ServerRequest server = new ServerRequest(parameters.Value.EndpointServer,parameters.Value.SendFirstMessage,parameters.Value.GetRequest);
sendFirstMessage.encryptedMessage = responseAES.encryptedData;
sendFirstMessage.encryptSignature = responseSign.signData;
sendFirstMessage.encryptedKey = responseAESKey.encryptedKey;
sendFirstMessage.idSignature = responseSignId.signData;
sendFirstMessage.initVector = responseAES.InitVector;
sendFirstMessage.userNameOrigin = interactModel.userNameOrigin;
sendFirstMessage.userNameDestination = interactModel.userNameDestination;
FileWriter.WriteOnEvents(EventLevel.Info, "Solicitud de envio de llave exitoso.");
return(Ok(sendFirstMessage));
}
