public void EncryptFile(IFormFile fileform, EncryptedMessage encryptedMessage, RSAEncryption rsaEncryption, DigitalSignature signature)
{
var sessionKey = _aes.GenerateRandomNumber(32);
var encryptedPacket = new EncryptedFile
{
Iv = _aes.GenerateRandomNumber(16),
SenderEmail = encryptedMessage.SenderEmail,
ReceiverEmail = encryptedMessage.ReceiverEmail,
EncryptedMessageId = encryptedMessage.EncryptedMessageId,
FileName = fileform.FileName,
};
byte[] fileInBytes;
using (var stream = new MemoryStream())
{
fileform.CopyToAsync(stream);
fileInBytes = stream.ToArray();
}
encryptedPacket.EncryptedData = _aes.Encrypt(fileInBytes, sessionKey, encryptedPacket.Iv);
encryptedPacket.EncryptedSessionKey = rsaEncryption.EncryptData(sessionKey);
using (var hmac = new HMACSHA256(sessionKey))
{
encryptedPacket.Hmac = hmac.ComputeHash(encryptedPacket.EncryptedData);
}
encryptedPacket.Signature = signature.SignData(encryptedPacket.Hmac);
_dbContext.EncryptedFiles.Add(encryptedPacket);
_dbContext.SaveChanges();
}
public EncryptedMessage EncryptData(Message email, RSAEncryption rsaEncryption,
DigitalSignature signature)
{
byte[] message = Encoding.ASCII.GetBytes(email.Text);
var sessionKey = _aes.GenerateRandomNumber(32);
var encryptedPacket = new EncryptedMessage
{
ReceiveDate = DateTime.Now,
Iv = _aes.GenerateRandomNumber(16),
SenderEmail = email.EmailSender,
ReceiverEmail = email.EmailReceiver
};
encryptedPacket.EncryptedData = _aes.Encrypt(message, sessionKey, encryptedPacket.Iv);
encryptedPacket.EncryptedSessionKey = rsaEncryption.EncryptData(sessionKey);
using (var hmac = new HMACSHA256(sessionKey))
{
encryptedPacket.Hmac = hmac.ComputeHash(encryptedPacket.EncryptedData);
}
encryptedPacket.Signature = signature.SignData(encryptedPacket.Hmac);
_dbContext.EncryptedMessages.Add(encryptedPacket);
_dbContext.SaveChanges();
return(encryptedPacket);
}