--- /dev/null
+/**
+ * @file prf.c
+ *
+ * @brief Generic interface for pseudo-random-functions
+ *
+ */
+
+/*
+ * 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.h"
+
+#include "prf_hmac_sha1.h"
+
+
+/*
+ * Described in header
+ */
+prf_t *prf_create(pseudo_random_function_t pseudo_random_function, chunk_t key)
+{
+ switch (pseudo_random_function)
+ {
+ case PRF_HMAC_SHA1:
+ {
+ return (prf_t*)prf_hmac_sha1_create(key);
+ }
+ case PRF_HMAC_MD5:
+ case PRF_HMAC_TIGER:
+ case PRF_AES128_CBC:
+ default:
+ return NULL;
+ }
+}
+
+
+
+
+
--- /dev/null
+/**
+ * @file prf.h
+ *
+ * @brief Generic interface for pseudo-random-functions
+ *
+ */
+
+/*
+ * 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.
+ */
+
+#ifndef PRF_H_
+#define PRF_H_
+
+#include "../../payloads/transform_substructure.h"
+
+
+/**
+ * Object representing a diffie hellman exchange
+ */
+typedef struct prf_s prf_t;
+
+struct prf_s {
+ /**
+ * @brief generates pseudo random bytes and writes them
+ * in the buffer
+ *
+ * @param this calling prf
+ * @param seed a chunk containing the seed for the next bytes
+ * @param [out]buffer pointer where the generated bytes will be written
+ * @return
+ * - SUCCESS in any case
+ */
+ status_t (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
+
+ /**
+ * @brief generates pseudo random bytes and allocate space for them
+ *
+ * @param this calling prf
+ * @param seed a chunk containing the seed for the next bytes
+ * @param [out]chunk chunk which will hold generated bytes
+ * @return
+ * - SUCCESS in any case
+ * - OUT_OF_RES if space could not be allocated
+ */
+ status_t (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
+
+ /**
+ * @brief get the block size of this prf
+ *
+ * @param this calling prf
+ * @return block size in bytes
+ */
+ size_t (*get_block_size) (prf_t *this);
+
+ /**
+ * @brief Destroys a prf object.
+ *
+ * @param this prf_t object to destroy
+ * @return
+ * SUCCESS in any case
+ */
+ status_t (*destroy) (prf_t *this);
+};
+
+/**
+ * Creates a new prf_t object
+ *
+ * @param pseudo_random_function Algorithm to use
+ * @param key A chunk containing the key
+ * @return
+ * - prf_t if successfully
+ * - NULL if out of ressources or prf not supported
+ */
+prf_t *prf_create(pseudo_random_function_t pseudo_random_function, chunk_t key);
+
+#endif /*PRF_H_*/