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 ResponseRSADecryption DecryptAESKey(byte[] encryptedKey, string containerName)
{
ResponseRSADecryption response = new ResponseRSADecryption {
result = false
};
byte[] decryptedKey;
CspParameters cspParameters = new CspParameters {
Flags = CspProviderFlags.UseExistingKey,
KeyContainerName = "OwnkeyEncrypts" + containerName
};
try
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(FileWriter.parameters.Value.KeyRSASize, cspParameters);
RSAParameters publicKey = rsa.ExportParameters(false);
RSAParameters privateKey = rsa.ExportParameters(true);
FileWriter.WriteOnEvents(EventLevel.Info, "Inicio proceso de descifrado de llave AES.");
decryptedKey = rsa.Decrypt(encryptedKey, true);
response.decryptedKey = decryptedKey;
FileWriter.WriteOnEvents(EventLevel.Info, "Proceso de descifrado de llave AES finalizada correctamente");
response.result = true;
}
catch (System.Exception ex)
{
FileWriter.WriteOnEvents(EventLevel.Exception, "Error descifrando llave aes" + ex.Message);
}
return(response);
}
