public string Unprotect(string protectedData, bool fromBase64 = false)
{
try
{
if (string.IsNullOrEmpty(protectedData))
{
return(string.Empty);
}
string text;
if (fromBase64)
{
try
{
text = Base256Encoders.DecryptFromBase64(protectedData, CurrentKey.MasterKey);
}
catch
{
List <DataProtectionKeys> keys = GetKeys();
if (keys.Count > 1)
{
text = Base256Encoders.DecryptFromBase64(protectedData, keys.Skip(1).FirstOrDefault().MasterKey);
return(text);
}
return(string.Empty);
}
}
else
{
try
{
text = Base256Encoders.DecryptFromBase256(protectedData, CurrentKey.MasterKey);
}
catch
{
List <DataProtectionKeys> keys2 = GetKeys();
if (keys2.Count > 1)
{
text = Base256Encoders.DecryptFromBase256(protectedData, keys2.Skip(1).FirstOrDefault().MasterKey);
return(text);
}
return(string.Empty);
}
}
string iV = GetIV();
if (text.StartsWith(iV))
{
return(text.Substring(iV.Length));
}
return(string.Empty);
}
catch
{
return(string.Empty);
}
}
public byte[] Unprotect(byte[] protectedData)
{
try
{
if (protectedData != null && protectedData.Length != 0)
{
byte[] bytes = Base256Encoders.DecryptFromBase256(protectedData, CurrentKey.MasterKey);
string _string = Base256Encoders.SecureUtf8Encoding.GetString(bytes);
string iV = GetIV();
if (_string.Length > iV.Length && _string.StartsWith(iV))
{
_string = _string.Substring(iV.Length);
return(Base256Encoders.SecureUtf8Encoding.GetBytes(_string));
}
return(new byte[0]);
}
return(new byte[0]);
}
catch
{
return(new byte[0]);
}
}
