public int StoreMessage(SelfDestructingMessage selfDestructingMessage, string passphrase, string attachmentName = null,
byte[] attachmentData = null)
{
if (selfDestructingMessage == null)
{
throw new ArgumentOutOfRangeException("selfDestructingMessage required");
}
selfDestructingMessage.Message = GzipCompression.Compress(selfDestructingMessage.Message);
var crypto = new SymmetricCryptoProvider();
selfDestructingMessage.Message = crypto.EncryptWithKey(selfDestructingMessage.Message, passphrase);
var db = new CryptAByteContext();
SelfDestructingMessageAttachment attachment = null;
// save attachment, if it exists
if (attachmentData != null && attachmentData.Length > 0)
{
MemoryStream streamOfOriginalFile = new MemoryStream(1024);
using (ZipFile zip = new ZipFile())
{
zip.AddEntry(attachmentName, attachmentData);
// zip.AddEntry(self, fileData);
zip.Save(streamOfOriginalFile);
}
byte[] zippedFile = RequestRepository.ReadFully(streamOfOriginalFile);
string fileAsString = Convert.ToBase64String(zippedFile);
attachment = new SelfDestructingMessageAttachment {
Attachment = fileAsString
};
attachment.Attachment = crypto.EncryptWithKey(fileAsString, passphrase);
attachment.SentDate = DateTime.Now;
//db.SelfDestructingMessageAttachments.Add(attachment);
}
db.SelfDestructingMessages.Add(selfDestructingMessage);
db.SaveChanges();
if (attachment != null)
{
attachment.MessageId = selfDestructingMessage.MessageId;
db.SelfDestructingMessageAttachments.Add(attachment);
db.ChangeTracker.DetectChanges();
db.SaveChanges();
}
return(selfDestructingMessage.MessageId);
}
public void Encrypt_Decrypt_ReturnsOriginalValue()
{
var crypto = new SymmetricCryptoProvider();
var cryptoText = crypto.EncryptWithKey(secret, password);
var original = crypto.DecryptWithKey(cryptoText, password);
Assert.AreEqual(secret, original);
}
public void Encrypt_Decrypt_Hash_ReturnsOriginalValue()
{
var crypto = new SymmetricCryptoProvider();
string hashedPassword = SymmetricCryptoProvider.GetSecureHashForString(password);
var cryptoText = crypto.EncryptWithKey(secret, hashedPassword);
var original = crypto.DecryptWithKey(cryptoText, hashedPassword);
Assert.AreEqual(secret, original);
}
private void btnEncrypt_Click(object sender, EventArgs e)
{
SymmetricCryptoProvider symmetricCrypt = new SymmetricCryptoProvider();
string password = txtPassphrase.Text;
if (string.IsNullOrWhiteSpace(password))
{
password = PronounceablePasswordGenerator.Generate(10);
MessageBox.Show(
string.Format("Your random password is {0}. \r Please copy it now then click OK.", password),
"Password generated", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
string cypertext = symmetricCrypt.EncryptWithKey(txtClearText.Text, password);
txtCypertext.Text = cypertext;
tabControl1.SelectTab(1);
}
