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
  */

src/libimcv/plugins/imv_attestation/imv_attestation.c

@@ -62,6 +62,12 @@ static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
  */
 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 initiator_nonce;
+
 /**
  * PTS file measurement database
  */
@@ -77,6 +83,11 @@ static pts_creds_t *pts_creds;
  */
 static credential_manager_t *pts_credmgr;
 
+/**
+ * TRUE if DH Nonce Parameters Request attribute is sent
+ */
+static bool dh_nonce_req_sent = FALSE;
+
 /**
  * see section 3.7.1 of TCG TNC IF-IMV Specification 1.2
  */
@@ -474,6 +485,7 @@ TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
 	}
 	DESTROY_IF(pts_db);
 	DESTROY_IF(pts_credmgr);
+	free(initiator_nonce.ptr);
 
 	libpts_deinit();
 

src/libpts/pts/pts.h

@@ -175,6 +175,46 @@ struct pts_t {
 	 */
 	bool (*calculate_secret) (pts_t *this);
 
+	/**
+	 * Set PTS Diffie Hellman Object
+	 *
+	 * @param dh			D-H object
+	 */
+	bool (*create_dh)(pts_t *this, pts_dh_group_t group);
+
+	/**
+	 * Gets Own Diffie Hellman Public Value
+	 *
+	 * @return				D-H Public Value
+	 */
+	chunk_t (*get_my_pub_val)(pts_t *this);
+
+	/**
+	 * Sets the public value of partner.
+	 *
+	 * @param value		public value of partner
+	 */
+	void (*set_other_pub_val) (pts_t *this, chunk_t value);
+
+	/**
+	 * Calculates secret assessment value to be used for TPM Quote as an external data
+	 *
+	 * @param initiator_nonce		Initiator nonce (IMV nonce)
+	 * @param responder_nonce		Responder nonce (IMC nonce)
+	 * @param algorithm				Hashing algorithm
+	 * @return						TRUE, FALSE if not both DH public values and
+	 *															 nonces are set
+	 */
+	bool (*calculate_secret) (pts_t *this, chunk_t initiator_nonce,
+						chunk_t responder_nonce, pts_meas_algorithms_t algorithm);
+
+	/**
+	 * Returns secret assessment value to be used for TPM Quote as an external data
+	 *
+	 * @return			Secret assessment value
+	 */
+	chunk_t (*get_secret) (pts_t *this);
+
 	/**
 	 * Get Platform and OS Info
 	 *