sqlite - Encrypted cookies in Chrome -

i working on c# forms application needs access specific cookie on computer, can fine. here's issue:

google stores cookies in sqlite, , i've downloaded sqlite database browser me @ these values. surprises me half of cookie values shows empty (including 1 need), though not.

the db file located at:

c:\users\%username%\appdata\local\google\chrome\user data\default\cookies 

on chrome have addon called "edit cookie" allows me directly modify cookies on website i'm on. addon can read these cookies, , web browser can parse values through http when needed different requests, there - still, sqlite browser, , custom code both come conclusion particular value field empty.

why that? somehow prevents field being read applications?

i've run same problem, , code below provides working example interested. credit scherling, dpapi spot on.

public class chromecookiereader {     public ienumerable<tuple<string,string>> readcookies(string hostname)     {         if (hostname == null) throw new argumentnullexception("hostname");          var dbpath = environment.getfolderpath(environment.specialfolder.localapplicationdata) + @"\google\chrome\user data\default\cookies";         if (!system.io.file.exists(dbpath)) throw new system.io.filenotfoundexception("cant find cookie store",dbpath); // race condition, i'll risk          var connectionstring = "data source=" + dbpath + ";pooling=false";          using (var conn = new system.data.sqlite.sqliteconnection(connectionstring))         using (var cmd = conn.createcommand())         {             var prm = cmd.createparameter();             prm.parametername = "hostname";             prm.value = hostname;             cmd.parameters.add(prm);              cmd.commandtext = "select name,encrypted_value cookies host_key = @hostname";              conn.open();             using (var reader = cmd.executereader())             {                 while (reader.read())                 {                     var encrypteddata = (byte[]) reader[1];                     var decodeddata = system.security.cryptography.protecteddata.unprotect(encrypteddata, null, system.security.cryptography.dataprotectionscope.currentuser);                     var plaintext = encoding.ascii.getstring(decodeddata); // looks ascii                      yield return tuple.create(reader.getstring(0), plaintext);                 }             }             conn.close();         }     } }