stroke: Make 96-bit truncation for SHA-256 configurable

src/starter/args.c

@@ -165,6 +165,7 @@ static const token_info_t token_info[] =
 	{ ARG_TIME, offsetof(starter_conn_t, dpd_timeout), NULL                        },
 	{ ARG_ENUM, offsetof(starter_conn_t, dpd_action), LST_dpd_action               },
 	{ ARG_ENUM, offsetof(starter_conn_t, close_action), LST_dpd_action             },
+	{ ARG_ENUM, offsetof(starter_conn_t, sha256_96), LST_bool                      },
 	{ ARG_TIME, offsetof(starter_conn_t, inactivity), NULL                         },
 	{ ARG_MISC, 0, NULL  /* KW_MODECONFIG */                                       },
 	{ ARG_MISC, 0, NULL  /* KW_XAUTH */                                            },

src/starter/confread.h

@@ -162,6 +162,8 @@ struct starter_conn {
 
 		dpd_action_t    close_action;
 
+		bool            sha256_96;
+
 		time_t          inactivity;
 
 		bool            me_mediation;

src/starter/keywords.h

@@ -64,6 +64,7 @@ enum kw_token_t {
 	KW_DPDTIMEOUT,
 	KW_DPDACTION,
 	KW_CLOSEACTION,
+	KW_SHA256_96,
 	KW_INACTIVITY,
 	KW_MODECONFIG,
 	KW_XAUTH,

src/starter/keywords.txt

@@ -61,6 +61,7 @@ dpddelay,          KW_DPDDELAY
 dpdtimeout,        KW_DPDTIMEOUT
 dpdaction,         KW_DPDACTION
 closeaction,       KW_CLOSEACTION
+sha256_96,         KW_SHA256_96
 inactivity,        KW_INACTIVITY
 modeconfig,        KW_MODECONFIG
 xauth,             KW_XAUTH

src/starter/starterstroke.c

@@ -220,6 +220,7 @@ int starter_stroke_add_conn(starter_config_t *cfg, starter_conn_t *conn)
 	msg->add_conn.dpd.timeout = conn->dpd_timeout;
 	msg->add_conn.dpd.action = conn->dpd_action;
 	msg->add_conn.close_action = conn->close_action;
+	msg->add_conn.sha256_96 = conn->sha256_96;
 	msg->add_conn.inactivity = conn->inactivity;
 	msg->add_conn.ikeme.mediation = conn->me_mediation;
 	push_string(&msg, add_conn.ikeme.mediated_by, conn->me_mediated_by);