public static string DecryptionComment(Comment comment, 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(comment.Key, RSAKeyInfo);
string plaintext = AesDecrypt(comment.Content, AesKeys[0], AesKeys[1]);
return plaintext;
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
public static Comment EncryptionComment(Comment comment, 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));
comment.Content = encrypted_data;
comment.Key = encrypted_key;
return comment;
}
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}