hash-algorithm-set: Add class to manage a set of hash algorithms

src/libstrongswan/crypto/hashers/hash_algorithm_set.h

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+/**
+ * @defgroup hash_algorithm_set hash_algorithm_set
+ * @{ @ingroup crypto
+ */
+
+#ifndef HASH_ALGORITHM_SET_H_
+#define HASH_ALGORITHM_SET_H_
+
+typedef struct hash_algorithm_set_t hash_algorithm_set_t;
+
+#include <library.h>
+#include <crypto/hashers/hasher.h>
+
+/**
+ * A set of hash algorithms
+ */
+struct hash_algorithm_set_t {
+
+	/**
+	 * Add the given algorithm to the set.
+	 *
+	 * @param alg		hash algorithm
+	 */
+	void (*add)(hash_algorithm_set_t *this, hash_algorithm_t alg);
+
+	/**
+	 * Check if the given algorithm is contained in the set.
+	 *
+	 * @param alg		hash algorithm
+	 * @return			TRUE if contained in set
+	 */
+	bool (*contains)(hash_algorithm_set_t *this, hash_algorithm_t alg);
+
+	/**
+	 * Number of hash algorithms contained in the set.
+	 *
+	 * @return			number of algorithms
+	 */
+	int (*count)(hash_algorithm_set_t *this);
+
+	/**
+	 * Enumerate the algorithms contained in the set.
+	 *
+	 * @return			enumerator over hash_algorithm_t (sorted by identifier)
+	 */
+	enumerator_t *(*create_enumerator)(hash_algorithm_set_t *this);
+
+	/**
+	 * Destroy a hash_algorithm_set_t instance
+	 */
+	void (*destroy)(hash_algorithm_set_t *this);
+};
+
+/**
+ * Create a set of hash algorithms.
+ *
+ * @return				hash_algorithm_set_t instance
+ */
+hash_algorithm_set_t *hash_algorithm_set_create();
+
+#endif /** HASH_ALGORITHM_SET_H_ @}*/