public string CifrarCadena(string CadenaOriginal)
{
MemoryStream memStream = new MemoryStream();
try
{
if (_key != null && _IV != null)
{
byte[] bytKey = MakeKeyByteArray();
byte[] bytIV = MakeIVByteArray();
byte[] textoPlano = Encoding.UTF8.GetBytes(CadenaOriginal);
memStream = new MemoryStream(CadenaOriginal.Length * 2);
CryptoServiceProvider _cryptoProvider = new CryptoServiceProvider((CryptoServiceProvider.EnumCryptoProvider)_algorithm, CryptoServiceProvider.EnumCryptoAction.Encrypt);
ICryptoTransform transform = _cryptoProvider.GetServiceProvider(bytKey, bytIV);
CryptoStream cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
cryptoStream.Write(textoPlano, 0, textoPlano.Length);
cryptoStream.Close();
}
else
{
throw new Exception("Error al inicializar la clave y el vector");
}
}
catch
{
throw;
}
return(Convert.ToBase64String(memStream.ToArray()));
}
public string DescifrarCadena(string CadenaCifrada)
{
MemoryStream memStream = null;
try
{
if (_key != null && _IV != null)
{
byte[] _bytkey = MakeKeyByteArray();
byte[] _bytIV = MakeIVByteArray();
byte[] _byttextocifrado = Convert.FromBase64String(CadenaCifrada);
memStream = new MemoryStream(CadenaCifrada.Length);
CryptoServiceProvider _cryptoProvider = new CryptoServiceProvider((CryptoServiceProvider.EnumCryptoProvider)_algorithm, CryptoServiceProvider.EnumCryptoAction.Desencrypt);
ICryptoTransform transform = _cryptoProvider.GetServiceProvider(_bytkey, _bytIV);
CryptoStream _cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
_cryptoStream.Write(_byttextocifrado, 0, _byttextocifrado.Length);
_cryptoStream.Close();
}
else
{
throw new Exception("Error al inicializar la clave y el vector.");
}
}
catch
{
throw;
}
return(Encoding.UTF8.GetString(memStream.ToArray()));
}
public void CifrarDescifrarArchivo(string InFileName, string OutFileName, EnumCryptoAction EnumAction)
{
if (!File.Exists(InFileName))
{
throw new Exception("No se ha encontrado el archivo.");
}
try
{
if (_key != null && _IV != null)
{
FileStream fsIn = new FileStream(InFileName, FileMode.Open, FileAccess.Read);
FileStream fsOut = new FileStream(OutFileName, FileMode.OpenOrCreate, FileAccess.Write);
fsOut.SetLength(0);
byte[] _bytKey = MakeKeyByteArray();
byte[] _bytIV = MakeIVByteArray();
byte[] _bytebuffer = new byte[4096];
long fileLength = fsIn.Length;
long bytesProcesed = 0;
int bytesInBlock = 0;
CryptoServiceProvider _cryptoProvider = new CryptoServiceProvider((CryptoServiceProvider.EnumCryptoProvider)_algorithm, (CryptoServiceProvider.EnumCryptoAction)EnumAction);
ICryptoTransform _transform = _cryptoProvider.GetServiceProvider(_bytKey, _bytIV);
CryptoStream _cryptoStream = null;
switch (EnumAction)
{
case EnumCryptoAction.Encrypt:
_cryptoStream = new CryptoStream(fsOut, _transform, CryptoStreamMode.Write);
break;
case EnumCryptoAction.Desencrypt:
_cryptoStream = new CryptoStream(fsOut, _transform, CryptoStreamMode.Write);
break;
}
while (bytesProcesed < fileLength)
{
bytesInBlock = fsIn.Read(_bytebuffer, 0, 4096);
_cryptoStream.Write(_bytebuffer, 0, bytesInBlock);
bytesProcesed += Convert.ToInt64(bytesInBlock);
}
if (_cryptoStream != null)
{
_cryptoStream.Close();
}
fsIn.Close();
fsOut.Close();
}
else
{
throw new Exception("Error al inicializar la clave y el vector.");
}
}
catch
{
throw;
}
}
