public static void Main()
{
//chave secreta
byte[] Key = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
//vetor de inicialização
byte[] IV = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
//Stream de memória
IO.MemoryStream memstream = new IO.MemoryStream(15);
//Stream de criptografia
CP.RC2CryptoServiceProvider provider = new CP.RC2CryptoServiceProvider();
CP.ICryptoTransform transform = provider.CreateEncryptor(Key, IV);
CP.CryptoStreamMode mode = CP.CryptoStreamMode.Write;
CP.CryptoStream stream = new CP.CryptoStream(memstream, transform, mode);
//Lê cada caracter da string
foreach (char ch in "Isto é um teste")
{
stream.WriteByte((Convert.ToByte(ch)));
}
int c;
//Reposiciona o ponteiro para leitura
memstream.Position = c = 0; //técnica não trivial, mas válida
while ((c = memstream.ReadByte()) != -1)
{
Console.Write((char)c);
}
stream.Close(); //Libera a stream (crypto)
memstream.Close(); //Libera a stream (mem)
}
private void EncryptUsingDotNet(Stream istream, Stream ostream, byte[] iv, bool forEncryption)
{
var engine = BlockCipherModel.Engine.Instance <SysSecurity.SymmetricAlgorithm>();
var mode =
(SysSecurity.CipherMode)Enum.Parse(typeof(SysSecurity.CipherMode), BlockCipherModel.Mode.ToString());
var padding =
(SysSecurity.PaddingMode)
Enum.Parse(typeof(SysSecurity.PaddingMode), BlockCipherModel.Padding.ToString());
engine.Mode = mode;
engine.Padding = padding;
SysSecurity.ICryptoTransform cryptoTranform = forEncryption
? engine.CreateEncryptor(PbkdfModel.Key, iv)
: engine.CreateDecryptor(PbkdfModel.Key, iv);
SysSecurity.CryptoStreamMode csMode = forEncryption
? SysSecurity.CryptoStreamMode.Write
: SysSecurity.CryptoStreamMode.Read;
using (
var encStream = new SysSecurity.CryptoStream(forEncryption ? ostream : istream, cryptoTranform, csMode))
{
if (forEncryption)
{
CopyStream(istream, encStream);
}
else
{
CopyStream(encStream, ostream);
}
}
}
