- prf_hmac_sha1 is now a generig prf_hmac

- supports md5

1 files changed, 112 insertions, 0 deletions

diff --git a/Source/charon/transforms/prfs/prf_hmac.c b/Source/charon/transforms/prfs/prf_hmac.c
new file mode 100644
index 000000000..3ebe45d98
--- /dev/null
+++ b/Source/charon/transforms/prfs/prf_hmac.c
@@ -0,0 +1,112 @@
+/**
+ * @file prf_hmac.c
+ * 
+ * @brief Implementation of prf_t interface using the
+ * a HMAC algorithm. This simply wraps a hmac in a prf.
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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.
+ */
+
+#include "prf_hmac.h"
+
+#include "../../utils/allocator.h"
+#include "../hmac.h"
+
+typedef struct private_prf_hmac_s private_prf_hmac_t;
+
+struct private_prf_hmac_s {
+	/**
+	 * public interface for this prf
+	 */
+	prf_hmac_t public;	
+	
+	/**
+	 * hmac to use for generation
+	 */
+	hmac_t *hmac;
+};
+
+/**
+ * implementation of prf_t.get_bytes
+ */
+static status_t get_bytes(private_prf_hmac_t *this, chunk_t seed, u_int8_t *buffer)
+{
+	return this->hmac->get_mac(this->hmac, seed, buffer);
+}
+
+/**
+ * implementation of prf_t.allocate_bytes
+ */
+static status_t allocate_bytes(private_prf_hmac_t *this, chunk_t seed, chunk_t *chunk)
+{
+	return this->hmac->allocate_mac(this->hmac, seed, chunk);
+}
+
+/**
+ * implementation of prf_t.get_block_size
+ */
+static size_t get_block_size(private_prf_hmac_t *this)
+{
+	return this->hmac->get_block_size(this->hmac);
+}
+
+/**
+ * implementation of prf_t.set_key
+ */
+static status_t set_key(private_prf_hmac_t *this, chunk_t key)
+{
+	this->hmac->set_key(this->hmac, key);
+	return SUCCESS;
+}
+
+/**
+ * implementation of prf_t.destroy
+ */
+static status_t destroy(private_prf_hmac_t *this)
+{
+	allocator_free(this);
+	this->hmac->destroy(this->hmac);
+	return SUCCESS;
+}
+
+/*
+ * Described in header
+ */
+prf_hmac_t *prf_hmac_create(hash_algorithm_t hash_algorithm)
+{
+	private_prf_hmac_t *this = allocator_alloc_thing(private_prf_hmac_t);
+	
+	if (this == NULL)
+	{
+		return NULL;	
+	}
+	
+	this->public.prf_interface.get_bytes = (status_t (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
+	this->public.prf_interface.allocate_bytes = (status_t (*) (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.set_key = (status_t (*) (prf_t *,chunk_t))set_key;
+	this->public.prf_interface.destroy = (status_t (*) (prf_t *))destroy;
+	
+	this->hmac = hmac_create(HASH_SHA1);
+	if (this->hmac == NULL)
+	{
+		allocator_free(this);
+		return NULL;	
+	}
+	
+	return &(this->public);
+}