public SymmetricParameters GenerateSymmetricParameters(string password, string salt)
{
Rijndael myalg = Rijndael.Create();
Rfc2898DeriveBytes mygenerator = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(salt));
SymmetricParameters ps = new SymmetricParameters()
{
SecretKey = mygenerator.GetBytes(myalg.KeySize / 8),
IV = mygenerator.GetBytes(myalg.BlockSize / 8)
};
return(ps);
}
public byte[] Decrypt(string fileData, SymmetricParameters p)
{
byte[] fileDataByte = Convert.FromBase64String(fileData);
Rijndael myalg = Rijndael.Create();
MemoryStream msOut = new MemoryStream();
CryptoStream myEncryptingStream = new CryptoStream(msOut, myalg.CreateDecryptor(p.SecretKey, p.IV), CryptoStreamMode.Write);
MemoryStream msIn = new MemoryStream(fileDataByte);
msIn.Position = 0;
msIn.CopyTo(myEncryptingStream);
myEncryptingStream.Flush();
myEncryptingStream.FlushFinalBlock();
msOut.Position = 0;
return(msOut.ToArray());
}
public string Encrypt(byte[] fileData, SymmetricParameters p)
{
string result = String.Empty;
Rijndael myalg = Rijndael.Create();
MemoryStream msOut = new MemoryStream();
CryptoStream myEncryptingStream = new CryptoStream(msOut, myalg.CreateEncryptor(p.SecretKey, p.IV), CryptoStreamMode.Write);
MemoryStream msIn = new MemoryStream(fileData);
msIn.Position = 0;
msIn.CopyTo(myEncryptingStream);
myEncryptingStream.Flush();
myEncryptingStream.FlushFinalBlock();
msOut.Position = 0;
result = Convert.ToBase64String(msOut.ToArray());
return(result);
}
