Hi Jayashree,

thanks for raising this. We will need to double check internally and get back to you.

Thanks, Antonio

From: Srinivasan, Jayashree via TF-M <tf-m@lists.trustedfirmware.org>
Sent: Thursday, November 7, 2024 15:32
To: tf-m@lists.trustedfirmware.org <tf-m@lists.trustedfirmware.org>
Subject: [TF-M] TF-M Small Profile with Initial Attestation - Related Query
 
Hello, 

I have been trying to test the initial attestation feature using the regression build for a platform that we are developing. TF-M small profile has been configured, which enables symmetric key-based attestation. On running the regression tests, the TFM_NS_ATTEST_TEST_2001 testcase fails.

On further debugging, I found that the static buffer that mbedtls uses for its allocation is not sufficient (
CRYPTO_ENGINE_BUF_SIZE = 0x400 in small profile). When I increase the buffer size to 0x500, the testcase passes.
Therefore, I wanted to know if this change needs to be adopted upstream or if I might be overlooking something on my end. Any leads in this regard would be helpful. 

Thanks, 
Jayashree