Microchip ATECC608C-TNGTLS Handleiding

Microchip Niet gecategoriseerd ATECC608C-TNGTLS

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Trust Platform Manifest File Format

Overview

The manifest file format is designed to convey the unique information about a group of secure subsystems, including

unique ID (e.g., serial number), public keys and certificates. This was primarily developed for CryptoAuthentication

™

(currently ATECC508A, ATECC608A and ATECC608B) secure elements. However, it is structured to work for other

secure subsystems as well.

Manifest files provide a way to link an actual Microchip Trust security device to the infrastructure environment that

it needs to connect to. These files are a critical aspect of the Microchip Trust&GO, TrustFLEX and, optionally,

TrustCUSTOM development environments. Whether you connect to an IoT cloud, a LoRaWAN

® network or,

potentially, any other infrastructure or environment, the manifest file uniquely ties a given device to that environment.

When working with Microchip Trust&GO, TrustFLEX or TrustCUSTOM products, a manifest file will be generated for

a group of devices that are provisioned through the Microchip Just-In-Time provisioning services. Each object entry

in the manifest file is known as a signed secure element and is signed by a Microchip Elliptic Curve Cryptography

(ECC) private key to validate its authenticity. The overall manifest is made of multiple signed secure elements.

Specific information associated with the manufacturer, the secure product device and specific individual device

information are all part of the information associated with a given signed secure element.

The manifest file is available in a secure fashion only to the customer that orders the group of devices. Accessing

these manifest files is part of the development and provisioning flow provided through Microchip. Once provisioning is

completed for a group of products, the manifest file is available for download.

and its subsidiaries

Family Reference Manual DS60001759A-page 1

Table of Contents

Overview........................................................................................................................................................ 1

1. Manifest Generation................................................................................................................................3

1.1. Microchip vs. Self-Generated Files.............................................................................................. 3

1.2. Trust&GO vs. TrustFLEX vs. TrustCUSTOM Files.......................................................................4

1.3. Prototype vs. Production Device Files..........................................................................................4

2. Structure and Format of a Manifest File..................................................................................................5

2.1. Introduction...................................................................................................................................5

2.2. Binary Encoding........................................................................................................................... 5

2.3. SecureElementManifest Object....................................................................................................5

2.4. SignedSecureElement Object...................................................................................................... 5

2.4.1. SignedSecureElementProtectedHeader Object............................................................ 6

2.5. SecureElement Object................................................................................................................. 6

2.6. EntityName Object....................................................................................................................... 7

2.7. PublicJWK Object.........................................................................................................................8

2.8. EncryptedSecretJWK Object........................................................................................................8

2.9. ModelInfo Object.......................................................................................................................... 8

2.9.1. CryptoAuthentication ModelInfo Object......................................................................... 8

2.9.1.1. CryptoAuthPublicDataElement Object........................................................ 9

3. Manifest File Example and Decoding....................................................................................................10

3.1. Manifest Example.......................................................................................................................10

3.2. Decode Python Example............................................................................................................12

4. Revision History.................................................................................................................................... 15

The Microchip Website.................................................................................................................................16

Product Change Notification Service............................................................................................................16

Customer Support........................................................................................................................................ 16

Microchip Devices Code Protection Feature................................................................................................ 16

Legal Notice................................................................................................................................................. 16

Trademarks.................................................................................................................................................. 17

Quality Management System....................................................................................................................... 18

Worldwide Sales and Service.......................................................................................................................19

and its subsidiaries

Family Reference Manual DS60001759A-page 2

1. Manifest Generation

The manifest of the TrustFLEX and Trust&GO devices can be generated in two scenarios. One is through the

Microchip Just-In-Time provisioning services (Microchip-generated) and the second one is a custom generation using

the scripts provided (self-generated).

In both cases, the Trust&GO, TrustFLEX and TrustCUSTOM devices will have different information due to differences

in their configuration.

The following sections provide manifest file differences between:

1. Microchip and self-generated files

– Manifest signature

2. Trust&GO and TrustFLEX files

3. Prototype and production device files

1.1 Microchip vs. Self-Generated Files

The manifest file format and generation procedures are public information; hence, they can be generated by users.

Due to this nature and when the procedures are followed, there will still be minor differences between Microchip and

self-generated files.

Manifest Signature

In the manifest file, each element is signed to ensure the integrity of the content. For a Microchip-generated manifest

file, the signing operation is performed by Microchip using its Certificate Authority (CA). The corresponding CA

certificate can be downloaded from the Microchip website. This certificate can be used to validate the authenticity of

the Microchip-generated files.

Tip:

• (under tab)

MCHP Manifest Signer Certificates Documentation

•Direct link to Download

For a self-generated manifest file, it is not possible to get each element signed by Microchip CA, as users do not

have access to a CA private key. It is required to generate/use a local CA to perform the signature operations. In

this case, the users must share the validation certificate along with the manifest file to others. This enables them to

validate the content before using it further.

The other differences include:

1. Trust&GO – Content remains the same, as the device data are immutable, but signature and verification

certificates are different, as self-generated scripts use their own CA.

2. TrustFLEX

a. Device and signer certificates can be different if custom PKI is selected during resource generation.

b. Slots 1-4, 13-15 vary based on additional key generations as part of resource generation at the user’s

location.

c. Signature and verification certificates are different, as self-generated scripts use their own CA.

The Trust Platform Design Suite provides the required scripts/tools to self-generate the manifest files.

Tip:

•Trust&GO manifest generation scripts

•TrustFLEX manifest generation scripts (with dev key generation)

Manifest Generation

and its subsidiaries

Family Reference Manual DS60001759A-page 3

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	ATECC608C-TNGTLS

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