Created bliss_bitpacker class to encode BLISS signatures

2014-11-29 14:51:17 +01:00
parent 7143667bdd
commit b352ee4266
8 changed files with 468 additions and 50 deletions
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2014 Andreas Steffen
+ * HSR 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 bliss_bitpacker bliss_bitpacker
+ * @{ @ingroup bliss_p
+ */
+
+#ifndef BLISS_BITPACKER_H_
+#define BLISS_BITPACKER_H_
+
+#include <library.h>
+
+typedef struct bliss_bitpacker_t bliss_bitpacker_t;
+
+/**
+ * Reads and writes a variable number of bits in packed format
+ * from and to an octet buffer
+ */
+struct bliss_bitpacker_t {
+
+	/**
+	 * Get the number of bits written into buffer
+	 *
+	 * @result			Number of bits written
+	 */
+	size_t (*get_bits)(bliss_bitpacker_t *this);
+
+	/**
+	 * Get the prime modulus of the Number Theoretic Transform
+	 *
+	 * @param value		Value to be written
+	 * @param bits		Number of bits to be written
+	 * @result			TRUE if value could be written into buffer
+	 */
+	bool (*write_bits)(bliss_bitpacker_t *this, uint16_t value, size_t bits);
+
+
+	/**
+	 * Get the prime modulus of the Number Theoretic Transform
+	 *
+	 * @param value		Value returned
+	 * @param bits		Number of bits to be read
+	 * @result			TRUE if value could be read from buffer
+	 */
+	bool (*read_bits)(bliss_bitpacker_t *this, uint16_t *value, size_t bits);
+
+	/**
+	 * Detach the internal octet buffer and return it
+	 */
+	chunk_t (*extract_buf)(bliss_bitpacker_t *this);
+
+	/**
+	 * Destroy bliss_bitpacker_t object
+	 */
+	void (*destroy)(bliss_bitpacker_t *this);
+};
+
+/**
+ * Create a bliss_bitpacker_t object for writing
+ *
+ * @param bits			Total number of bits to be stored 
+ */
+bliss_bitpacker_t* bliss_bitpacker_create(size_t max_bits);
+
+/**
+ * Create a bliss_bitpacker_t object for reading
+ *
+ * @param data			Packed array of bits 
+ */
+bliss_bitpacker_t* bliss_bitpacker_create_from_data(chunk_t data);
+
+#endif /** BLISS_BITPACKER_H_ @}*/