1 files changed, 131 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/xcbc/xcbc_prf.c b/src/libstrongswan/plugins/xcbc/xcbc_prf.c
new file mode 100644
index 000000000..03056594d
--- /dev/null
+++ b/src/libstrongswan/plugins/xcbc/xcbc_prf.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * 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.
+ *
+ * $Id$
+ */
+
+#include "xcbc_prf.h"
+
+#include "xcbc.h"
+
+typedef struct private_xcbc_prf_t private_xcbc_prf_t;
+
+/**
+ * Private data of a xcbc_prf_t object.
+ */
+struct private_xcbc_prf_t {
+
+	/**
+	 * Public xcbc_prf_t interface.
+	 */
+	xcbc_prf_t public;	
+	
+	/**
+	 * xcbc to use for generation.
+	 */
+	xcbc_t *xcbc;
+};
+
+/**
+ * Implementation of prf_t.get_bytes.
+ */
+static void get_bytes(private_xcbc_prf_t *this, chunk_t seed, u_int8_t *buffer)
+{
+	this->xcbc->get_mac(this->xcbc, seed, buffer);
+}
+
+/**
+ * Implementation of prf_t.allocate_bytes.
+ */
+static void allocate_bytes(private_xcbc_prf_t *this, chunk_t seed, chunk_t *chunk)
+{
+	if (chunk)
+	{
+		*chunk = chunk_alloc(this->xcbc->get_block_size(this->xcbc));
+		get_bytes(this, seed, chunk->ptr);
+	}
+	else
+	{
+		get_bytes(this, seed, NULL);
+	}
+}
+
+/**
+ * Implementation of prf_t.get_block_size.
+ */
+static size_t get_block_size(private_xcbc_prf_t *this)
+{
+	return this->xcbc->get_block_size(this->xcbc);
+}
+
+/**
+ * Implementation of prf_t.get_block_size.
+ */
+static size_t get_key_size(private_xcbc_prf_t *this)
+{
+	/* in xcbc, block and key size are always equal */
+	return this->xcbc->get_block_size(this->xcbc);
+}
+
+/**
+ * Implementation of prf_t.set_key.
+ */
+static void set_key(private_xcbc_prf_t *this, chunk_t key)
+{
+	this->xcbc->set_key(this->xcbc, key);
+}
+
+/**
+ * Implementation of prf_t.destroy.
+ */
+static void destroy(private_xcbc_prf_t *this)
+{
+	this->xcbc->destroy(this->xcbc);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+xcbc_prf_t *xcbc_prf_create(pseudo_random_function_t algo)
+{
+	private_xcbc_prf_t *this;
+	xcbc_t *xcbc;
+	
+	switch (algo)
+	{
+		case PRF_AES128_XCBC:
+			xcbc = xcbc_create(ENCR_AES_CBC, 16);
+			break;
+		default:
+			return NULL;
+	}
+	if (!xcbc)
+	{
+		return NULL;
+	}
+	
+	this = malloc_thing(private_xcbc_prf_t);
+	this->xcbc = xcbc;
+	
+	this->public.prf_interface.get_bytes = (void (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
+	this->public.prf_interface.allocate_bytes = (void (*) (prf_t*,chunk_t,chunk_t*))allocate_bytes;
+	this->public.prf_interface.get_block_size = (size_t (*) (prf_t*))get_block_size;
+	this->public.prf_interface.get_key_size = (size_t (*) (prf_t*))get_key_size;
+	this->public.prf_interface.set_key = (void (*) (prf_t *,chunk_t))set_key;
+	this->public.prf_interface.destroy = (void (*) (prf_t *))destroy;
+	
+	return &this->public;
+}
+