1 files changed, 121 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/cmac/cmac_prf.c b/src/libstrongswan/plugins/cmac/cmac_prf.c
new file mode 100644
index 000000000..17affe439
--- /dev/null
+++ b/src/libstrongswan/plugins/cmac/cmac_prf.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * 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 "cmac_prf.h"
+
+#include "cmac.h"
+
+typedef struct private_cmac_prf_t private_cmac_prf_t;
+
+/**
+ * Private data of a cmac_prf_t object.
+ */
+struct private_cmac_prf_t {
+
+	/**
+	 * Public cmac_prf_t interface.
+	 */
+	cmac_prf_t public;
+
+	/**
+	 * cmac to use for generation.
+	 */
+	cmac_t *cmac;
+};
+
+METHOD(prf_t, get_bytes, void,
+	private_cmac_prf_t *this, chunk_t seed, u_int8_t *buffer)
+{
+	this->cmac->get_mac(this->cmac, seed, buffer);
+}
+
+METHOD(prf_t, allocate_bytes, void,
+	private_cmac_prf_t *this, chunk_t seed, chunk_t *chunk)
+{
+	if (chunk)
+	{
+		*chunk = chunk_alloc(this->cmac->get_block_size(this->cmac));
+		get_bytes(this, seed, chunk->ptr);
+	}
+	else
+	{
+		get_bytes(this, seed, NULL);
+	}
+}
+
+METHOD(prf_t, get_block_size, size_t,
+	private_cmac_prf_t *this)
+{
+	return this->cmac->get_block_size(this->cmac);
+}
+
+METHOD(prf_t, get_key_size, size_t,
+	private_cmac_prf_t *this)
+{
+	/* in cmac, block and key size are always equal */
+	return this->cmac->get_block_size(this->cmac);
+}
+
+METHOD(prf_t, set_key, void,
+	private_cmac_prf_t *this, chunk_t key)
+{
+	this->cmac->set_key(this->cmac, key);
+}
+
+METHOD(prf_t, destroy, void,
+	private_cmac_prf_t *this)
+{
+	this->cmac->destroy(this->cmac);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+cmac_prf_t *cmac_prf_create(pseudo_random_function_t algo)
+{
+	private_cmac_prf_t *this;
+	cmac_t *cmac;
+
+	switch (algo)
+	{
+		case PRF_AES128_CMAC:
+			cmac = cmac_create(ENCR_AES_CBC, 16);
+			break;
+		default:
+			return NULL;
+	}
+	if (!cmac)
+	{
+		return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.prf = {
+				.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,
+			},
+		},
+		.cmac = cmac,
+	);
+
+	return &this->public;
+}
+