Free Purpose Fields

This memory area can be used for storing any data required for application protection, including: hardware algorithm descriptors, license tables, key words, data sets, constants, code blocks, etc.

You can create fields of various types, edit their contents and delete them.

Important information

All models of available modern Guardant dongles contain several default hardware algo-rithm descriptors and protected items.

From within an application data stored in the area of free purpose fields is accessed using the Guardant API functions.

Types and main properties of free purpose fields:

Field type		Size, bytes	Contents	Hardware locks	Working with field from within the application (Guardant API)
Algorithm		Field size is defined by the size of algorithm descriptor	Hardware algorithm descriptor	Mandatory read/write locks	GrdTransform, GrdCrypt, GrdHash, GrdCodeInit GrdPI_Activate, GrdPI_Deactivate, GrdPI_Read, GrdPI_Update GrdTRU_DecryptQuestion, GrdTRU_EncryptAnswer, GrdTRU_ApplyAnswer
Protected item		Arbitrary size into the modern dongles; 1 – 255 + service fields into the old models	Protected item descriptor	Mandatory read/write locks	GrdPI_Activate, GrdPI_Deactivate, GrdPI_Read, GrdPI_Update
License table	Guardant Sign Net/ Time Net/ Net III	1 or 2 per ele-ment+ service fields (not more than 254 bytes)	Actual license resource Information on the software modules number and license limit of each module	Mandatory read/write locks	GrdPI_Activate, GrdPI_Deactivate, GrdPI_Read, GrdPI_Update
License table	Guardant Net II / Net	1 or 2 per element 127 modules maximum	Information on the software modules number and license limit of each module	Mandatory write locks	GrdRead
Integer		1, 2, 4, 8	Integer or unsigned integer	Write locks (when necessary)	GrdRead, GrdWrite
String		Random size	Character sequence in ANSI or Unicode encoding	Write locks (when necessary)	GrdRead, GrdWrite
Counter		1, 2, 4, 8	Unsigned integer. Increments automatically on each operation of writing a mask into the dongle memory	Write locks (when necessary)	GrdRead, GrdWrite
Dump		Random size	Binary dump	Write locks (when necessary)	GrdRead, GrdWrite

There is a certain order of free purpose fields. This is because there are fields which require mandatory protection by hardware restrictions. Moreover, a special thing about hardware restrictions is that they can only be placed in the beginning of the free purpose fields area (starting with 14UAM address) and form a continuous block.

Thus,

The fields protected by hardware algorithms with default read and write locks are grouped in the beginning of free purpose fields’ area: hardware algorithms, protected items and license table of Net III format (Fields of two last types can be created only in Guardant Stealth III / Net III dongles). Whereas GrdUtil.exe does not allow for inserting fields of different type between them.
The fields protected by write locks are allocated after fields protected by read and write locks. For example, license table of Guardant Net II/ Net format.
Further, fields of other types can be placed in random order: integer, string, dump, and counter. Whereas GrdUtil.exe does not allow for inserting fields between them, which must be protected by hardware restrictions by default.

New field is added into mask before the field selected from the list.

To create a new field select a Free memory field from the list (or any other created field from the area of free purpose ones) and select Edit | Add new field.

Add new field dialog box will appear. Select a field type and specify its name and size.

Add new field dialog box:

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Add new field dialog box control elements:

Interface element	Description of purpose
Name	Specifies any valid name for the field being created
Size in bytes	Selects possible / sets arbitrary field size. Size depends on the selected field type.
Field type	Selects field type out of list of possible types

The dialog box interface may slightly differ depending on the mask type and field being created.

After filling in the current dialog box you need to click [Next] to move the field properties dialog box.

More detailed information on creating and working with fields of various types is given in respective chapters.

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Free Purpose Fields