public static string DecryptionPost(Post post, Account account)
{
try
{
//byte[] bytePrivateKey = System.Text.Encoding.Default.GetBytes(privateKey);
//tworzy klucz AES i macierz Inicjującą
//tworzy nowa pare kluczy RSA
using (RSACryptoServiceProvider myRsa = new RSACryptoServiceProvider())
{
// Deszyfrowanie
RSAParameters RSAKeyInfo = new RSAParameters();
RSAKeyInfo = myRsa.ExportParameters(true);
RSAKeyInfo.Modulus = account._Modulus;
RSAKeyInfo.D = account._D;
RSAKeyInfo.DP = account._DP;
RSAKeyInfo.DQ = account._DQ;
RSAKeyInfo.Exponent = account._Exponent;
RSAKeyInfo.InverseQ = account._InvereQ;
RSAKeyInfo.P = account._P;
RSAKeyInfo.Q = account._Q;
myRsa.ImportParameters(RSAKeyInfo);
byte[][] AesKeys = DecryptAesKey(post.Key, RSAKeyInfo);
string plaintext = AesDecrypt(post.Content, AesKeys[0], AesKeys[1]);
return plaintext;
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
public ActionResult AddPost(string content)
{
var currentId = User.Identity.GetUserId();
var post = new Post
{
PostId = Guid.NewGuid().ToString(),
Date = DateTime.Now,
Author = User.Identity.GetUserName(),
Rated = false,
Plus = 0,
Minus = 0
};
post.OrginId = post.PostId;
var account = db.Accounts.Single(x => x.AccountId == currentId);
post.AccountId = currentId;
var publicKey = account.PublicKey;
post = TextEncryption.EncryptionPost(post, content, account);
account.Posts.Add(post);
db.Accounts.AddOrUpdate(account);
db.SaveChanges();
foreach (var friend in account.Friends)
{
var friendTmp = db.Accounts.Single(x => x.AccountId == friend.FriendId);
var friendPublicKey = friendTmp.PublicKey;
var postTmp = new Post
{
PostId = Guid.NewGuid().ToString(),
Author = post.Author,
Date = post.Date,
OrginId = post.OrginId,
Minus = post.Minus,
Plus = post.Plus,
Rated = post.Rated,
AccountId = friendTmp.AccountId
};
postTmp = TextEncryption.EncryptionPost(postTmp, content, friendTmp);
friendTmp.Posts.Add(postTmp);
db.Accounts.AddOrUpdate(friendTmp);
db.SaveChanges();
}
return View("Index");
}
public static Post EncryptionPost(Post post, string content, Account account)
{
try
{
//tworzy klucz AES i macierz Inicjującą
using (Aes myAes = Aes.Create())
{
//tworzy nowa pare kluczy RSA
using (RSACryptoServiceProvider myRsa = new RSACryptoServiceProvider())
{
//Szyfrujemy text i zapisujemy do bazy
byte[] encrypted_data = AesEncrypt(content, myAes.Key, myAes.IV);
//Szyfrujemy klucz i zapisujemy do bazy
RSAParameters RSAKeyInfo = new RSAParameters();
RSAKeyInfo = myRsa.ExportParameters(false);
RSAKeyInfo.Modulus = account.PublicKey;
RSAKeyInfo.Exponent = account.Exponent;
myRsa.ImportParameters(RSAKeyInfo);
byte[] encrypted_key = AesKeyEncrypt(myAes.Key, myAes.IV, myRsa.ExportParameters(false));
post.Content = encrypted_data;
post.Key = encrypted_key;
return post;
}
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
