Signing the user application with 2 digital signatures

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Amoham25
Level 1
Level 1
5 likes given 5 questions asked 10 sign-ins

Hello , 

I want to ask about if it applicable to sign the user application with 2 different digital signatures and the secure image will Untitled.png validate these 2 signatures ?

 

 

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1 Solution
Reza_A
Moderator
Moderator
Moderator
100 replies posted 25 solutions authored 10 likes given

Hi @Amoham25,

Thank you for sharing the details to help me understand your project better.

Yes, it is applicable for you to have 2 digital signatures for your use case.

Best regards.

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3 Replies
Reza_A
Moderator
Moderator
Moderator
100 replies posted 25 solutions authored 10 likes given

Hi @Amoham25,

Thank you for your query.

In the Figure 3, TOC2 stores the address of Public Key that will be used to authenticate the Secure Image Code and User Application Code. Please refer to Table 6 Elements of TOC2, kindly find that the TOC2 only stores 1 address of signature verification key (0x104).

I hope this helps. If you have further queries, could you kindly elaborate more on your exact use case?
Thank you, @Amoham25.

Best regards.

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Hello @Reza_A  , 

Thank you for your reply, yes i know that TOC2 can carry one Public key(boot key) ,so i will store the second public key(update key) in HSM (secure image) and use it to validate the digital signature2 

My use case is to sign the software with to keys (boot key , update key) and use update key only when bootloader flash a new SW image, to verify it 

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Reza_A
Moderator
Moderator
Moderator
100 replies posted 25 solutions authored 10 likes given

Hi @Amoham25,

Thank you for sharing the details to help me understand your project better.

Yes, it is applicable for you to have 2 digital signatures for your use case.

Best regards.