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Original question:

BQ27Z746: The HMAC SHA256 Keys

BQ27Z746: BqKeyPackager SHA256

Hans Huang
Prodigy 20 points
Part Number: BQ27Z746
Other Parts Discussed in Thread: BQKEYPACKAGER

Hi, TI experts，

There is a confusing pop window when I generate bqk files, and the steps are as follow:

1.Choose "SHA256 Key bq9035"

2.Choose "Chanllenge(20~32bytes/40~64 hex)" and then enter SHA256 Chanllenge 1 and  Chanllenge 2

3.Choose “Key(32 bytes/64 hex)” and then enter Authentication Key

4.Enter password and comment

5.Rechoose "Chanllenge(20~32bytes/40~64 hex)"

And then click “Create bqKey File”, there will be the pop windows like this: 

I think the “0x0303030303030303030303030303030303030303030303030303030303030303” will be the HMAC SHA256 Key.

The question is: 

(1) What's the “Generated SHA256 Key” stands for? Will this Key affects the authentication process?

(2) When can the bqKeyPackager with bq9037 option release? (refer to https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1199589/bq27z746-bq27z746-the-hmac-sha256-keys/4527142?focus=true#4527142) Because I need it urgently, can you please share one to this account in advance?

Waiting for your reply.

Thanks!

  • 0
    TI__Guru*** 130456 points

    您好，

    1. The final key consists of 2 parts - Customerkey and Factorykey. The challenge is used to create a digest. This digest is displayed in the message

    2. bq9035 and bq9037 use the same type of authentication, so you can select bq9035 to package the key for bq9037

  • 0 回复 Star Xu
    Prodigy 20 points

    Some more questions, 

    (1) So the message show in the pop windows "0x72CD6E8422C407FB6D098690F113087D75877BB41D39385FB8455CE60ECD8DDA" is the Factorykey?

    (2) The final key is  0x030303030303030303030303030303030303030303030303030303030303030372CD6E8422C407FB6D098690F113087D75877BB41D39385FB8455CE60ECD8DDA ?

    Is my understanding correct? Just little confused, can you explain more detail ?

    Thanks!

  • +1 回复 Hans Huang
    TI__Guru*** 130456 points

    您好，The 2 keys are combined using an algorithm and stored. The value that is stored is shown on screen.