Access Microsoft Azure DocumentDB from Unity

GetAuthorizationTokenUsingMasterKey.cs

    /// <summary>
    /// 
    /// </summary>
    /// <param name="verb"></param>
    /// <param name="resourceId"></param>
    /// <param name="resourceType"></param>
    /// <param name="date"></param>
    /// <param name="masterKey"></param>
    /// <returns></returns>
    private string GetAuthorizationTokenUsingMasterKey( string verb, string resourceId, string resourceType, string date, string masterKey )
    {
        var decode = Convert.FromBase64String( masterKey );
        var text = string.Format( "{0}\n{1}\n{2}\n{3}\n\n", verb.ToLower(), resourceType, resourceId, date );

        string signature;
        using ( var hmac = new HMACSHA256( decode ) )
        {
            signature = Convert.ToBase64String( hmac.ComputeHash( Encoding.UTF8.GetBytes( text.ToLower() ) ) );
        }

        return WWW.EscapeURL( string.Format( "type=master&ver=1.0&sig={0}", signature ) );
    }