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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/prf_plus.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2005-2006 Martin Willi
                      3:  * Copyright (C) 2005 Jan Hutter
                      4:  * HSR Hochschule fuer Technik Rapperswil
                      5:  *
                      6:  * This program is free software; you can redistribute it and/or modify it
                      7:  * under the terms of the GNU General Public License as published by the
                      8:  * Free Software Foundation; either version 2 of the License, or (at your
                      9:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                     10:  *
                     11:  * This program is distributed in the hope that it will be useful, but
                     12:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     13:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     14:  * for more details.
                     15:  */
                     16: 
                     17: /**
                     18:  * @defgroup prf_plus prf_plus
                     19:  * @{ @ingroup crypto
                     20:  */
                     21: 
                     22: #ifndef PRF_PLUS_H_
                     23: #define PRF_PLUS_H_
                     24: 
                     25: typedef struct prf_plus_t prf_plus_t;
                     26: 
                     27: #include <crypto/prfs/prf.h>
                     28: 
                     29: /**
                     30:  * Implementation of the prf+ function used in IKEv1/IKEv2 keymat extension.
                     31:  */
                     32: struct prf_plus_t {
                     33: 
                     34:        /**
                     35:         * Get pseudo random bytes.
                     36:         *
                     37:         * @param length        number of bytes to get
                     38:         * @param buffer        pointer where the generated bytes will be written
                     39:         * @return                      TRUE if bytes generated successfully
                     40:         */
                     41:        bool (*get_bytes)(prf_plus_t *this, size_t length,
                     42:                                          uint8_t *buffer) __attribute__((warn_unused_result));
                     43: 
                     44:        /**
                     45:         * Allocate pseudo random bytes.
                     46:         *
                     47:         * @param length        number of bytes to get
                     48:         * @param chunk         chunk which will hold generated bytes
                     49:         * @return                      TRUE if bytes allocated successfully
                     50:         */
                     51:        bool (*allocate_bytes)(prf_plus_t *this, size_t length,
                     52:                                                   chunk_t *chunk) __attribute__((warn_unused_result));
                     53: 
                     54:        /**
                     55:         * Destroys a prf_plus_t object.
                     56:         */
                     57:        void (*destroy)(prf_plus_t *this);
                     58: };
                     59: 
                     60: /**
                     61:  * Creates a new prf_plus_t object.
                     62:  *
                     63:  * @param prf                          prf object to use, must be destroyed after prf+.
                     64:  * @param counter                      use an appending counter byte (for IKEv2 variant)
                     65:  * @param seed                         input seed for prf
                     66:  * @return                                     prf_plus_t object, NULL on failure
                     67:  */
                     68: prf_plus_t *prf_plus_create(prf_t *prf, bool counter, chunk_t seed);
                     69: 
                     70: #endif /** PRF_PLUS_H_ @}*/