zkey: Add keystore related commands

Add new commands to the zkey utility to store secure AES keys in
the secure key repository provided by the keystore implementation
introduced in the previous commit.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zkey/misc.h

@@ -3,7 +3,7 @@
  *
  * Local helper functions
  *
- * Copyright 2017 IBM Corp.
+ * Copyright IBM Corp. 2017, 2018
  *
  * s390-tools is free software; you can redistribute it and/or modify
  * it under the terms of the MIT license. See LICENSE for details.
@@ -37,7 +37,7 @@ void misc_print_invalid_command(const char *command)
 /**
  * An required parameter has not been specified
  *
- * @param[in] option  Parameter string
+ * @param[in] parm_name  Parameter string
  */
 void misc_print_required_parm(const char *parm_name)
 {
@@ -45,4 +45,17 @@ void misc_print_required_parm(const char *parm_name)
 	util_prg_print_parse_error();
 }
 
-#endif
+/**
+ * An required parameter has not been specified
+ *
+ * @param[in] parm_name1  Parameter string 1
+ * @param[in] parm_name2  Parameter string 2
+ */
+static void misc_print_required_parms(const char *parm_name1,
+				      const char *parm_name2)
+{
+	warnx("Parameter '%s' or '%s' is required", parm_name1, parm_name2);
+	util_prg_print_parse_error();
+}
+
+#endif