public IActionResult ReceiveMessage(SendMessageModel messageModel)
{
string filePublicKey = parameters.Value.FilesOutput + parameters.Value.PubKeyFile + messageModel.userNameDestination + messageModel.userNameOrigin;
RSAEncryption rsaEncryption = new RSAEncryption();
AESEncryption aesEncryption = new AESEncryption();
RSASigning rsaSigning = new RSASigning();
//Decrypt symmetric key
ResponseRSADecryption rsaDecryptResponse = new ResponseRSADecryption();
rsaDecryptResponse = rsaEncryption.DecryptAESKey(messageModel.encryptedKey, messageModel.userNameDestination + messageModel.userNameOrigin);
if (!rsaDecryptResponse.result)
{
FileWriter.WriteOnEvents(EventLevel.Error, "Error descifrando llave AES con RSA.");
return(BadRequest(new { result = false }));
}
//Decrypt Message
ResponseAESDecryption responseAESDecryption = new ResponseAESDecryption();
responseAESDecryption = aesEncryption.DecryptMessage(messageModel, rsaDecryptResponse.decryptedKey);
if (!responseAESDecryption.result)
{
FileWriter.WriteOnEvents(EventLevel.Error, "Error descifrando mensaje con AES.");
return(BadRequest(new { result = false }));
}
//Validate Sign
if (!rsaSigning.validateSignAndHash(responseAESDecryption.decryptedMessage, messageModel.encryptSignature, filePublicKey))
{
FileWriter.WriteOnEvents(EventLevel.Atention, "La información recibida es corrupta.");
return(BadRequest(new { result = false }));
}
//Muestra mensaje
return(Ok(new{ mensaje = responseAESDecryption.decryptedMessage }));
}
internal ResponseAESDecryption DecryptMessage(SendMessageModel messageModel, byte[] decryptedKey)
{
ResponseAESDecryption response = new ResponseAESDecryption {
result = false
};
// Create an AesCryptoServiceProvider object with the specified key and IV.
using (AesCryptoServiceProvider aesDecrypt = new AesCryptoServiceProvider()){
FileWriter.WriteOnEvents(EventLevel.Info, "Inicio proceso de descifrado de mensaje.");
aesDecrypt.Key = decryptedKey;
aesDecrypt.IV = messageModel.initVector;
// Create a decryptor to perform the stream transform.
ICryptoTransform decryptor = aesDecrypt.CreateDecryptor(aesDecrypt.Key, aesDecrypt.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(messageModel.encryptedMessage))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream and place them in a string.
response.decryptedMessage = srDecrypt.ReadToEnd();
response.result = true;
FileWriter.WriteOnEvents(EventLevel.Info, "Proceso de descifrado de mensaje finalizado correctamente");
}
}
}
}
return(response);
}
