[mbed-tls] Verify cert chain

Hi,

I have one root ca, intermediate ca, and device certificate in der format.

While am trying to verify one by one as intermediate-ca with root-ca and device cert with intermediate-ca; things work fine.

But if I tried to verify like having two context one for ca and one chain. I parse root ca on CA context and intermediate ca and device cert on chain context. Now verification fails with flag 8 error code -0x2700.

I have attached verify_der_one_by_one.c it is working without any issue; but verify_der_chain.c is causing the issue stated above.

Any help would be appreciated.

Thanks, Gopi Krishnan