/// <summary>
/// Metodo que se manda a ejecutar desde otras clases para encriptar o desencriptar cadenas
/// </summary>
/// <param name="pstrText">Frase a encriptar o desencriptar</param>
/// <param name="penmTransformType">Enumeracion para indicar si se encripta o decripta</param>
/// <returns></returns>
public string Transmute(string pstrText, enmTransformType penmTransformType)
{
string str = string.Empty;
try
{
str = this.Transform(pstrText.Trim(), this.PassPhrase, this.SaltValue, this.HashAlgorithm, this.PassIterations, this.InitVector, this.KeySize, penmTransformType);
}
catch (Exception exception)
{
throw exception;
}
return(str);
}
/// <summary>
/// Metodo que encripta una cadena usando un algoritmo propio de TV Azteca
/// </summary>
/// <param name="pstrText">Palabra a encriptar</param>
/// <param name="pstrPassPhrase">Palabra clave para encriptar</param>
/// <param name="pstrSaltValue">Palabra clave para la llave de seguridad</param>
/// <param name="pstrHashAlgorithm">Algoritmo de encriptamiento</param>
/// <param name="pintPassIterations">Numero de iteraciones que tiene que hacer el encriptado</param>
/// <param name="pstrInitVector">Nombre Clave para desencriptar</param>
/// <param name="pintKeySize">Tamaño de la clave</param>
/// <param name="penmTransformType">Indicador para encriptar o desencriptar</param>
/// <returns>Retorna frase encriptada o desencriptada</returns>
private string Transform(string pstrText, string pstrPassPhrase, string pstrSaltValue, string pstrHashAlgorithm, int pintPassIterations, string pstrInitVector, int pintKeySize, enmTransformType penmTransformType = 0)
{
byte[] rgbIV = null;
rgbIV = Encoding.ASCII.GetBytes(pstrInitVector);
byte[] rgbSalt = null;
rgbSalt = Encoding.ASCII.GetBytes(pstrSaltValue);
byte[] buffer = null;
if (penmTransformType == enmTransformType.intEncrypt)
{
buffer = Encoding.UTF8.GetBytes(pstrText);
}
else
{
buffer = Convert.FromBase64String(pstrText);
}
PasswordDeriveBytes bytes = new PasswordDeriveBytes(pstrPassPhrase, rgbSalt, pstrHashAlgorithm, pintPassIterations);
byte[] rgbKey = null;
rgbKey = bytes.GetBytes(pintKeySize / 8);
RijndaelManaged managed = new RijndaelManaged
{
Mode = CipherMode.CBC
};
ICryptoTransform transform = null;
if (penmTransformType == enmTransformType.intEncrypt)
{
transform = managed.CreateEncryptor(rgbKey, rgbIV);
}
else
{
transform = managed.CreateDecryptor(rgbKey, rgbIV);
}
MemoryStream stream = null;
CryptoStream stream2 = null;
string str = null;
if (penmTransformType == enmTransformType.intEncrypt)
{
stream = new MemoryStream();
stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Write);
stream2.Write(buffer, 0, buffer.Length);
stream2.FlushFinalBlock();
str = Convert.ToBase64String(stream.ToArray());
}
else
{
stream = new MemoryStream(buffer);
stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Read);
byte[] buffer6 = null;
buffer6 = new byte[buffer.Length + 1];
int count = 0;
count = stream2.Read(buffer6, 0, buffer6.Length);
str = Encoding.UTF8.GetString(buffer6, 0, count);
}
stream.Close();
stream2.Close();
return(str);
}
