Re: [PATCH] selftests: add TPM 2.0 tests

On Tue, Nov 27, 2018 at 02:10:48PM -0800, Jarkko Sakkinen wrote:

Added the tests that I've been using for testing TPM 2.0 functionality for long time but have out-of-tree so far residing in

https://github.com/jsakkine-intel/tpm2-scripts

Cc: Tadeusz Struk tadeusz.struk@intel.com Signed-off-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com

Just one thing I didn't really understand:

• def start_auth_session(self, session_type, name_alg = TPM2_ALG_SHA1):

•    fmt = '>HII IIH16sHBHH'
  

•    cmd = struct.pack(fmt,
  

•                      TPM2_ST_NO_SESSIONS,
  

•                      struct.calcsize(fmt),
  

•                      TPM2_CC_START_AUTH_SESSION,
  

•                      TPM2_RH_NULL,
  

•                      TPM2_RH_NULL,
  

•                      16,
  

•                      '\0' * 16,
  

•                      0,
  

•                      session_type,
  

•                      TPM2_ALG_NULL,
  

•                      name_alg)
  

•    return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
  

• def __calc_pcr_digest(self, pcrs, bank_alg = TPM2_ALG_SHA1,

•                      digest_alg = TPM2_ALG_SHA1):
  

•    x = []
  

Is there a reason for using `'\0' * 16` there instead of just 0?