public XElement RemoveElementBehavior(XElement element)
{
var value = element.Element(XName.Get("Value", "string"));
if (value == null)
throw new ArgumentException("element must contain <value> element");
var attribute = value.Attribute("iv");
if (attribute == null)
throw new ArgumentException("element must contain a <value> element with iv attribute");
var encryptedValue = new EncryptedValue
{
Base64Iv = attribute.Value,
EncryptedBase64Value = element.Value,
};
var unencryptedValue = EncryptionService.Decrypt(encryptedValue);
return XElement.Parse(unencryptedValue);
}
public string Decrypt(EncryptedValue encryptedValue)
{
var encrypted = Convert.FromBase64String(encryptedValue.EncryptedBase64Value);
using (var rijndael = new RijndaelManaged())
{
rijndael.Key = Key;
rijndael.IV = Convert.FromBase64String(encryptedValue.Base64Iv);
rijndael.Mode = CipherMode.CBC;
using (var decryptor = rijndael.CreateDecryptor())
using (var memoryStream = new MemoryStream(encrypted))
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
using (var reader = new StreamReader(cryptoStream))
{
return reader.ReadToEnd();
}
}
}
