Crypto Verification Failing Intermittently

RE: Crypto Verification Failing Intermittently

Einar Thorsrud — Wed, 27 Nov 2019 15:46:19 GMT

I see,

Do you see the same if you switch to the Oberon backend (changing backend in sdk_config.h)? It would be useful to narrow down the problem. Any other obvious difference when it fails and not? Does the size of the data matter or something else? Does the same input data and signature fail always, or does it only fail sometimes?

RE: Crypto Verification Failing Intermittently

RPDben — Wed, 27 Nov 2019 14:16:59 GMT

Hi Einar

I did check this and they are correct
We are only using the CC310 backend
SDK 15.2.0, S140 v6.0.0

RE: Crypto Verification Failing Intermittently

Einar Thorsrud — Wed, 27 Nov 2019 12:56:42 GMT

Hi,

The return value indicates a signature verification failure, so I would not expect you to get this if you have verified that the data and signature is correct

Could there be a buffer corruption issue of some sort? Can you try to verify that the input buffers (holding the data and signature) are valid after you check the signature as well to check that?
Do you get the same retult using both the Oberon and CC310 backend, or only using one of the backends?
Also, which SDK are you using?