[CC1354P10]Cryptography AES, SHA

Son JeongHyeon

Prodigy 140 points

Hello, TI team,

I want know how to use AES-128-CCM.

In the SDK, AES-128-CCM parameters are aad, nonce, mac.

nonce is IV?, mac is Tag?

And I wish to use HKDF-SHA256.

If I use the SHA2_hmac API in the SDK, can I get the same result as HKDF-SHA256?

Thanks.

Jay.

over 1 year ago

0 Siri over 1 year ago

TI__Guru* 81141 points

Nonce is not the IV, but the nonce is part of what is written to the IV:

The IV must be written with the flags for the cryptographic operation and the NONCE bytes, for both authentication and encryption (see Section 12.2.7.2) in the TRM for more info

I am not familiar with HKDF-SHA256, and cannot find any mentioning of it in the SDK or TRM, so I cannot answer this.

Documentation for the AESCCM driver if found here:

AESCCM.h File Reference (ti.com)

Siri

0 Son JeongHyeon over 1 year ago in reply to Siri

Prodigy 140 points

Thanks~

Actually, Im using SHA2 driver for HMAC-SHA256

But im not sure it is same feature for HKDF-SHA256.

I need more help about this..

0 Siri over 1 year ago in reply to Son JeongHyeon

TI__Guru* 81141 points

As I previously wrote, I am not familiar with HKDF-SHA256 and cannot find anything regarding this in our documentation, so I cannot answer if SHA2_hmac API in the SDK, can I get the same result as HKDF-SHA256.

Siri

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[CC1354P10]Cryptography AES, SHA