Make the hmac_t interface a generic interface for message authentication codes

2012-06-25 16:35:06 +02:00
parent 228d096e42
commit c4a3c9672a
11 changed files with 131 additions and 132 deletions
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "mac_prf.h"
+
+typedef struct private_prf_t private_prf_t;
+
+/**
+ * Private data of a mac_prf_t object.
+ */
+struct private_prf_t {
+
+	/**
+	 * Public interface
+	 */
+	prf_t public;
+
+	/**
+	 * MAC to use
+	 */
+	mac_t *mac;
+};
+
+METHOD(prf_t, get_bytes, void,
+	private_prf_t *this, chunk_t seed, u_int8_t *buffer)
+{
+	this->mac->get_mac(this->mac, seed, buffer);
+}
+
+METHOD(prf_t, allocate_bytes, void,
+	private_prf_t *this, chunk_t seed, chunk_t *chunk)
+{
+	if (!chunk)
+	{
+		this->mac->get_mac(this->mac, seed, NULL);
+	}
+	else
+	{
+		*chunk = chunk_alloc(this->mac->get_mac_size(this->mac));
+		this->mac->get_mac(this->mac, seed, chunk->ptr);
+	}
+}
+
+METHOD(prf_t, get_block_size, size_t,
+	private_prf_t *this)
+{
+	return this->mac->get_mac_size(this->mac);
+}
+
+METHOD(prf_t, get_key_size, size_t,
+	private_prf_t *this)
+{
+	/* IKEv2 uses MAC size as key size */
+	return this->mac->get_mac_size(this->mac);
+}
+
+METHOD(prf_t, set_key, void,
+	private_prf_t *this, chunk_t key)
+{
+	this->mac->set_key(this->mac, key);
+}
+
+METHOD(prf_t, destroy, void,
+	private_prf_t *this)
+{
+	this->mac->destroy(this->mac);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+prf_t *mac_prf_create(mac_t *mac)
+{
+	private_prf_t *this;
+
+	INIT(this,
+		.public = {
+			.get_bytes = _get_bytes,
+			.allocate_bytes = _allocate_bytes,
+			.get_block_size = _get_block_size,
+			.get_key_size = _get_key_size,
+			.set_key = _set_key,
+			.destroy = _destroy,
+		},
+		.mac = mac,
+	);
+
+	return &this->public;
+}