public string EncryptString(string CadenaOriginal)
{
MemoryStream memoryStream;
try
{
bool flag = stringKey == null || stringIV == null;
if (flag)
{
throw new Exception("Error al inicializar la clave y el vector");
}
byte[] key = MakeKeyByteArray();
byte[] iV = MakeIVByteArray();
byte[] bytes = Encoding.UTF8.GetBytes(CadenaOriginal);
memoryStream = new MemoryStream(checked (CadenaOriginal.Length * 2));
ICryptoTransform serviceProvider = new CryptoServiceProvider((CryptoServiceProvider.CryptoProvider)algorithm, CryptoServiceProvider.CryptoAction.Encrypt).GetServiceProvider(key, iV);
CryptoStream cryptoStream = new CryptoStream(memoryStream, serviceProvider, CryptoStreamMode.Write);
cryptoStream.Write(bytes, 0, bytes.Length);
cryptoStream.Close();
}
catch (Exception ex)
{
throw ex;
}
return(Convert.ToBase64String(memoryStream.ToArray()));
}
public string DecryptString(string CadenaCifrada)
{
MemoryStream memoryStream;
try
{
bool flag = stringKey == null || stringIV == null;
if (flag)
{
throw new Exception("Error al inicializar la clave y el vector.");
}
byte[] key = MakeKeyByteArray();
byte[] iV = MakeIVByteArray();
byte[] array = Convert.FromBase64String(CadenaCifrada);
memoryStream = new MemoryStream(CadenaCifrada.Length);
ICryptoTransform serviceProvider = new CryptoServiceProvider((CryptoServiceProvider.CryptoProvider)algorithm, CryptoServiceProvider.CryptoAction.Desencrypt).GetServiceProvider(key, iV);
CryptoStream cryptoStream = new CryptoStream(memoryStream, serviceProvider, CryptoStreamMode.Write);
cryptoStream.Write(array, 0, array.Length);
cryptoStream.Close();
}
catch (Exception ex)
{
throw ex;
}
return(Encoding.UTF8.GetString(memoryStream.ToArray()));
}
public void EncryptDecryptFile(string InFileName, string OutFileName, CryptoAction Action)
{
bool flag = !File.Exists(InFileName);
if (flag)
{
throw new Exception("No se ha encontrado el archivo.");
}
checked
{
try
{
bool flag2 = stringKey == null || stringIV == null;
if (flag2)
{
throw new Exception("Error al inicializar la clave y el vector.");
}
FileStream fileStream = new FileStream(InFileName, FileMode.Open, FileAccess.Read);
FileStream fileStream2 = new FileStream(OutFileName, FileMode.OpenOrCreate, FileAccess.Write);
fileStream2.SetLength(0L);
byte[] key = MakeKeyByteArray();
byte[] iV = MakeIVByteArray();
byte[] buffer = new byte[4097];
long length = fileStream.Length;
long num = 0L;
ICryptoTransform serviceProvider = new CryptoServiceProvider((CryptoServiceProvider.CryptoProvider)algorithm, (CryptoServiceProvider.CryptoAction)Action).GetServiceProvider(key, iV);
CryptoStream cryptoStream = null;
if (Action != CryptoAction.Encrypt)
{
if (Action == CryptoAction.Desencrypt)
{
cryptoStream = new CryptoStream(fileStream2, serviceProvider, CryptoStreamMode.Write);
}
}
else
{
cryptoStream = new CryptoStream(fileStream2, serviceProvider, CryptoStreamMode.Write);
}
while (num < length)
{
int num2 = fileStream.Read(buffer, 0, 4096);
cryptoStream.Write(buffer, 0, num2);
num += unchecked ((long)num2);
}
bool flag3 = cryptoStream != null;
if (flag3)
{
cryptoStream.Close();
}
fileStream.Close();
fileStream2.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
