removed X509_PEER flag; flags are meant to read cert, not to store additional state in cert

removed x509_t.set_flags for the reason above
implemented a simple, generic shared_key_t

src/libstrongswan/credentials/keys/shared_key.c

@@ -25,3 +25,87 @@ ENUM(shared_key_type_names, SHARED_ANY, SHARED_PIN,
 	"PIN",
 );
 
+typedef struct private_shared_key_t private_shared_key_t;
+
+/**
+ * private data of shared_key
+ */
+struct private_shared_key_t {
+
+	/**
+	 * public functions
+	 */
+	shared_key_t public;
+	
+	/**
+	 * type of this shared key
+	 */
+	shared_key_type_t type;
+	
+	/**
+	 * associated shared key data
+	 */
+	chunk_t key;
+	
+	/**
+	 * reference counter
+	 */
+	refcount_t ref;
+};
+
+/**
+ * Implements shared_key_t.get_type
+ */
+static shared_key_type_t get_type(private_shared_key_t *this)
+{
+	return this->type;
+}
+
+/**
+ * Implements shared_key_t.get_key
+ */
+static chunk_t get_key(private_shared_key_t *this)
+{
+	return this->key;
+}
+
+/**
+ * Implements shared_key_t.get_ref
+ */
+static shared_key_t* get_ref(private_shared_key_t *this)
+{
+	ref_get(&this->ref);
+	return &this->public;
+}
+
+/**
+ * Implementation of shared_key_t.destroy
+ */
+static void destroy(private_shared_key_t *this)
+{
+	if (ref_put(&this->ref))
+	{
+		free(this->key.ptr);
+		free(this);
+	}
+}
+
+/*
+ * see header file
+ */
+shared_key_t *shared_key_create(shared_key_type_t type, chunk_t key)
+{
+	private_shared_key_t *this = malloc_thing(private_shared_key_t);
+	
+	this->public.get_type = (shared_key_type_t (*)(shared_key_t *this))get_type;
+	this->public.get_key = (chunk_t (*)(shared_key_t *this))get_key;
+	this->public.get_ref = (shared_key_t* (*)(shared_key_t *this))get_ref;
+	this->public.destroy = (void(*)(shared_key_t*))destroy;
+	
+	this->type = type;
+	this->key = key;
+	this->ref = 1;
+	
+	return &this->public;
+}
+

src/libstrongswan/credentials/keys/shared_key.h

@@ -83,4 +83,13 @@ struct shared_key_t {
     void (*destroy)(shared_key_t *this);
 };
 
+/**
+ * A simple private key implementation
+ *
+ * @param type		type of the shared key
+ * @param key		key data, gets owned by instance
+ * @return			simple shared key instance
+ */
+shared_key_t *shared_key_create(shared_key_type_t type, chunk_t key);
+
 #endif /** SHARED_KEY_H_ @} */