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diff --git a/src/libstrongswan/integrity_checker.h b/src/libstrongswan/integrity_checker.h
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+/*
+ * Copyright (C) 2009 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.
+ */
+
+/**
+ * @defgroup integrity_checker integrity_checker
+ * @{ @ingroup libstrongswan
+ */
+
+#ifndef INTEGRITY_CHECKER_H_
+#define INTEGRITY_CHECKER_H_
+
+#include <utils.h>
+#include <plugins/plugin.h>
+
+typedef struct integrity_checker_t integrity_checker_t;
+typedef struct integrity_checksum_t integrity_checksum_t;
+
+/**
+ * Struct to hold a precalculated checksum, implemented in the checksum library.
+ */
+struct integrity_checksum_t {
+	/* name of the checksum */
+	char *name;
+	/* size in bytes of the file on disk */
+	size_t file_len; 
+	/* checksum of the file on disk */
+	u_int32_t file;
+	/* size in bytes of executable segment in memory */
+	size_t segment_len; 
+	/* checksum of the executable segment in memory */
+	u_int32_t segment;
+};
+
+/**
+ * Code integrity checker to detect non-malicious file manipulation.
+ *
+ * The integrity checker reads the checksums from a separate library
+ * libchecksum.so to compare the checksums.
+ */
+struct integrity_checker_t {
+
+	/**
+	 * Check the integrity of a file on disk.
+	 *
+	 * @param name		name to lookup checksum
+	 * @param file		path to file
+	 * @return			TRUE if integrity tested successfully
+	 */
+	bool (*check_file)(integrity_checker_t *this, char *name, char *file);
+	
+	/**
+	 * Build the integrity checksum of a file on disk.
+	 *
+	 * @param file		path to file
+	 * @param len		return length in bytes of file
+	 * @return			checksum, 0 on error
+	 */
+	u_int32_t (*build_file)(integrity_checker_t *this, char *file, size_t *len);
+	
+	/**
+	 * Check the integrity of the code segment in memory.
+	 *
+	 * @param name		name to lookup checksum
+	 * @param sym		a symbol in the segment to check
+	 * @return			TRUE if integrity tested successfully
+	 */
+	bool (*check_segment)(integrity_checker_t *this, char *name, void *sym);
+	/**
+	 * Build the integrity checksum of a code segment in memory.
+	 *
+	 * @param sym		a symbol in the segment to check
+	 * @param len		return length in bytes of code segment in memory
+	 * @return			checksum, 0 on error
+	 */
+	u_int32_t (*build_segment)(integrity_checker_t *this, void *sym, size_t *len);
+	
+	/**
+	 * Check both, on disk file integrity and loaded segment.
+	 *
+	 * @param name		name to lookup checksum
+	 * @param sym		a symbol to look up library and segment
+	 * @return			TRUE if integrity tested successfully
+	 */
+	bool (*check)(integrity_checker_t *this, char *name, void *sym);
+	
+	/**
+	 * Destroy a integrity_checker_t.
+	 */
+	void (*destroy)(integrity_checker_t *this);
+};
+
+/**
+ * Create a integrity_checker instance.
+ *
+ * @param checksum_library		library containing checksums
+ */
+integrity_checker_t *integrity_checker_create(char *checksum_library);
+
+#endif /* INTEGRITY_CHECKER_H_ @}*/