Implemented handling of DH Parameters Response and Finish attributes

Implemented calculating session secrets

src/libimcv/plugins/imc_attestation/imc_attestation.c

@@ -67,6 +67,12 @@ static linked_list_t *evidences = NULL;
  */
 static pts_dh_group_t supported_dh_groups = 0;
 
+/**
+ * High Entropy Random Data
+ * used in calculation of shared secret for the assessment session
+ */
+static chunk_t responder_nonce;
+
 /**
  * see section 3.7.1 of TCG TNC IF-IMC Specification 1.2
  */