/// <summary>
/// Intercepts a method and after invocation checks to see if the request implements ICacheable
/// if so, the ICacheItemInvalidator is invoked to remove the item from the cache
/// </summary>
public virtual void Intercept(IInvocation invocation)
{
ArgumentValidation.ComponentNotNull(_cacheInvalidator);
invocation.Proceed();
_cacheInvalidator.Invalidate(invocation.ReturnValue as ICacheInvalidation);
}
/// <summary>
/// Encrypts the specified input.
/// </summary>
/// <param name="input">The input.</param>
/// <returns></returns>
public string Encrypt(string input)
{
ArgumentValidation.ComponentNotNull(_passwordLocator);
if (input.IsNullOrEmpty())
{
return(string.Empty);
}
Rijndael rinedal = null;
byte[] plainText = null;
string base64Encoded;
try
{
string password = _passwordLocator.Locate();
//get the ASCII bytes for the input
plainText = Encoding.ASCII.GetBytes(input);
//create the password derived bytes used to generate the key and IV values
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, GenerateSalt(password));
//Instantiate the Rijndael symmetric algorithm
rinedal = Rijndael.Create();
rinedal.Padding = PaddingMode.ISO10126;
rinedal.KeySize = 256;
//create the encryptor
ICryptoTransform cryptoTransform = rinedal.CreateEncryptor(pdb.GetBytes(32), pdb.GetBytes(16));
//encrypt and encode to Base64
base64Encoded = Convert.ToBase64String(cryptoTransform.TransformFinalBlock(plainText, 0, plainText.Length));
}
finally
{
// this clears out any secret data
if (rinedal != null)
{
rinedal.Clear();
}
// zeroes out our array
if (plainText != null)
{
for (int i = 0; i < plainText.Length; i++)
{
plainText[i] = 0;
}
}
}
return(base64Encoded);
}
public void Invalidate(ICacheInvalidation cacheInvalidator)
{
if (cacheInvalidator == null || cacheInvalidator.IgnoreCache)
{
return;
}
ArgumentValidation.ComponentNotNull(_cacheConfiguration);
foreach (var item in cacheInvalidator.Items)
{
InvalidateItem(item);
}
}
/// <summary>
/// Decrypts the specified input.
/// </summary>
/// <param name="input">The input.</param>
/// <returns></returns>
public string Decrypt(string input)
{
ArgumentValidation.ComponentNotNull(_passwordLocator);
if (input.IsNullOrEmpty())
{
return(string.Empty);
}
Rijndael rinedal = null;
byte[] cipherText = Convert.FromBase64String(input);
byte[] plainText;
try
{
string password = _passwordLocator.Locate();
//create the password derived bytes used to generate the key and IV values
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, GenerateSalt(password));
//Instantiate the Rijndael symmetric algorithm
rinedal = Rijndael.Create();
rinedal.Padding = PaddingMode.ISO10126;
//create the Decryptor
ICryptoTransform cryptoTransform = rinedal.CreateDecryptor(pdb.GetBytes(32), pdb.GetBytes(16));
//Decrypt
plainText = cryptoTransform.TransformFinalBlock(cipherText, 0, cipherText.Length);
}
finally
{
if (rinedal != null)
{
rinedal.Clear();
}
}
return(Encoding.ASCII.GetString(plainText));
}
