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An encoding description contains the information for the electronic personalization of a card. Nexus PRIME supports a variety of authentication technologies such as RFID and PKI. You can combine several technologies or RFID variants on a multi-functional or hybrid card. To create an encoding description, you must import the encoding definition from a file. The encoding description has a proprietary syntax and describes the information that will be sent to Nexus PRIME Production Client and hence to the encoding unit in the card printer or to the card terminal during electronic personalization.

Format of encoding description

 Format of an encoding description

The format of an encoding description is an INI file using sections, elements and values. There are standard sections in the file that contain information:

SectionDescription
EncodingThe Encoding section contains information about the chip. The content is typically always the same.
Fields

The Fields section is a list of fields that are used to hold variables in other sections. This is the data "interface" description which is parsed by the server applications to show a list of configurable values to the administrator.

Description

The Description section is a collection of values that do not belong to a certain application.

Application_X

The Application_X section represents an application, that is, one part of the chip that should be encoded in a certain way. The X stands for characters that identify the application in order to control the order of applications in which they are processed.

The encoding description file includes a header and basic definitions, explained below.

Header

 The Encoding section in the header

Each encoding description file has a header, consisting of the Encoding section, for example:

[Encoding]
Type=1024,Chip
Devices=8710
MessagingServerField=#LocalTestServer

The header contains the following elements:

ElementDescription

Type

Defines the identifier in decimal format for the encoding technology (1024 is used for smart cards), then separated by a comma, the corresponding descriptive and human readable name.

Devices

Defines the device identifier of the device type that can be used to process the encoding description.

It is a list of comma separated identifiers, though for PKI card encodings only a singe value is used, which must be one of the following:

  • 8710 (standard value for most PKI encodings in PRIME)
  • 8711 (single card operation in PRIME Explorer via Personal Desktop App - not applicable for any other use-case at the moment)

Subtype

As an alternative to Devices, the element Subtype may be used (but currently not for smart cards):

Contains an identifier in decimal format, that describes the sub group of the encoding. This is typically used for RFID encodings (for example, for the RFID encoding Mifare, there exist identifiers for Mifare Classic, Mifare DESfire, Mifare DESFire EV2, ...). Nexus Card SDK internally uses a mechanism to look for suitable devices, using a function like GetSupportedDevices(Type, SubType) to select a device for the processing of an encoding description. All these definitions are typically handled by tools (DSCBuilder) and runtime software (im2card32.dll, com32.dll) and therefore not further described here. Defined values are listed in the source files of Nexus Card SDK, globals.h and encodings.h.

MessagingServerField

Allows to select a Personal Messaging Server to be used with this encoding. This is optional and can be omitted if there is exactly one configuration available.

You can refer to a field name like this:

[Fields]
MESSAGING_SERVER_CONFIG=

[Encoding]
MessagingServerField=MESSAGING_SERVER_CONFIG

Alternatively, you can provide a fixed name via the # prefix:

[Encoding]
MessagingServerField=#MyMessagingServerConfigName

Basic definitions

 Define PKCS#11 library

Some basic definitions are needed for PKI card encoding use cases.

  1. Define the PKCS#11 library like this:

    [Description]
...
PKCS11Library=siecap11.dll
...

    Description of the elements:

    ElementDescription

    PKCS11Library

    Defines the PKCS#11 library to be used (for example, siecap11.dll).

    You can also specify additional/alternative variants that specify the operating system and CPU architecture, for example, PKCS11LibraryWindows32= for 32 bit processes running on Windows. JPKIEncoder will select the most precise match.

    PKCSLibraryField

    Can alternatively be used to refer to a mapped field containing the value.

  2. Depending on the requirements for an operating system and/or platform specific definition, use the following library definitions (as many definitions as required):

    1. PKCS11LibraryWindows[64|32]=<library name>

    2. PKCS11LibraryWindows[64|32]Field=<library name>

Recommendations:

  • Notations without 'Windows' are not recommended. Other operating systems are not supported at the moment.

  • Always state whether you refer to a 64Bit DLL or to a 32Bit one.

  • Operating system is always required when platform is specified.

Examples:

[Fields]
P11LIB_32=
P11LIB_64=
...
 
[Description]
PKCS11LibraryWindows64=cardos_64.dll  // if your middleware doesn't provide a 64-bit DLL just skip this entry
PKCS11LibraryWindows32=cardos.dll     // if you don't need a 32-bit DLL just skip this entry
...
PKCS11LibraryWindows64Field=P11LIB_64   // It's recommended to provide the fields always as a pair and use null for the architecture, that doesn't apply
PKCS11LibraryWindows32Field=P11LIB_32
...

The Fields section provides the ability to set the PKCS#11 library through the mapped fields. This rule will apply:

You can provide multiple of these parameters in your description file and even through the mapped fields at the same time. The best match will automatically be selected, that is, the more specific parameter wins. However, if a parameter in the description file defines the exact same as a parameter defined in the mapped fields, then the one from the mapped fields wins and will be selected because of higher priority.

PKCS#11 library definition for use with Nexus Personal Desktop App

Nexus PRIME uses Nexus Personal Desktop App to encode cards with PRIME Self-Service as well as optionally with PRIME Explorer.

For this use case you need to specify the middleware DLL as follows:

  1. Always use the DLL suffix of the name and be clear what type of DLL you are referring to.

  2. If the middleware requires a 32 bit DLL to operate properly (like Nexus Personal Desktop Client), make sure that PKCS11LibraryWindows32 is the only library definition in the encoding description. You also need to specify the absolute path with forward-slashes (even if the containing folder is in the PATH environment variable), for example:

    PKCS11LibraryWindows32=C:/Program Files (x86)/Personal/bin/personal.dll

  3. For other middlewares, define both PKCS11LibraryWindows32 and PKCS11LibraryWindows64, for example:

    PKCS11LibraryWindows32=cardos11.dll
PKCS11LibraryWindows64=cardos11_64.dll
 Define MiniDriverLibrary

Currently, MiniDriver support in PRIME is limited to the JPKIEncoder (that is, no support for Nexus Personal Desktop App), CardOS middleware and certain specific use cases (SKI, reading MDCardSerialNumber, writing CardD).

PRIME uses it to complement PKCS#11, not as a replacement - hence you still need to specify the PKCS#11 library definition shown above as well.

This is an example of a MiniDriver definition:

[Description]
...
MiniDriverLibraryWindows32=cardoscm.dll
MiniDriverLibraryWindows64=cardoscm64.dll
...

Description of the elements:

ElementDescription

MiniDriverLibrary

Defines the MiniDriver library to be used (for example, cardoscm64). You can also specify additional/alternative variants that specify the operating system and CPU architecture, for example, MiniDriverLibraryWindows32= for 32 bit processes running on Windows. JPKIEncoder will select the most precise match.

Recommendations:

As MiniDriver libraries are specific to Windows, it is highly recommended to use this more specific nomenclature:

  • MiniDriverLibraryWindows[platform]=<library name>
  • MiniDriverLibraryWindows[platform]Field=<library name>
    where platform is 32 or 64.

Example:

Same as with PKCS#11 library definitions, you can also specify absolute paths and use the Field variants to specify mapped fields containing the name of the library:

MiniDriverLibraryWindows32=c:\windows\SysWoW64\cardoscm.dll MiniDriverLibraryWindows64=c:\windows\system32\cardoscm64.dll MiniDriverLibraryWindows32Field=MD32_FIELD MiniDriverLibraryWindows64Field=MD64_FIELD
 Define ApplicationList

This is an example of ApplicationList definition:

[Description]
...
ApplicationList=ABC
...

Description of the elements:

ElementDescription

ApplicationList

Contains the list of applications that is used to access a card. Each digit activates the corresponding Application. For example, ABC > Application_A, Application_B, Application_C.

Each application typically (but not exclusively) represents a single certificate to be encoded.

There are also non-certificate applications (for example, CardOS APDU scripts).

 Encode a subset of applications

You can encode a subset of all applications defined in your encoding description file through mapped fields. Define there, for example, just “BC” to encode just application B and C without application A. You set a field and a special element ApplicationListField which points to the field instead the regular property ApplicationList:

[Fields]
AppList=
 
[Description]
ApplicationListField=AppList
 
[Application_A]
...
[Application_B]
...
[Application_C]
...

Description of the elements:

ElementDescription

ApplicationListField

Defines that the application list will be taken from a field mapping.

Certificate template related definition

You must define a certificate template in order to perform any certificate or key related operation for a user (for example, key archival, key recovery, etc.). There are two ways to define certificate template details in the encoding description file.

 Certificate template definition without field mapping

Certificate template definition can be defined via the CertTempl element in the respective Application section of the encoding description:

[Fields]
...
 
[Description]
...
 
[Application_A]
CertTempl=MyCertTemplate

Description of the elements:

ElementDescription

CertTempl

Defines the PRIME certificate template name to be used, which is configured to reference the CA and the Token Procedure on the CA.

 Certificate template definition with field mapping

Certificate template definition can also be defined via field mapping fields. This can be achieved via the CertTemplField element in the respective Application section of the encoding description. Also add the field names to the Fields section.

[Fields]
...
MyCertTemplField1=
MyCertTemplField2=
 
[Description]
...
 
[Application_A]
...
CertTemplField=MyCertTemplField1
 
 
[Application_B]
...
CertTemplField=MyCertTemplField2

Description of the elements:

ElementDescription

CertTemplField

Defines the certificate template mapped field name. This mapped field value will be considered as cert template name. You can also use a JUEL expression as shown above for MyCertTemplate1 to reference a datapool field. Non-datapool process variables currently are not fully supported.

CertTempl and CertTemplField field should not be defined together in same application of encoding description file.

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