128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup prf prf
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* @{ @ingroup crypto
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*/
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#ifndef PRF_H_
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#define PRF_H_
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typedef enum pseudo_random_function_t pseudo_random_function_t;
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typedef struct prf_t prf_t;
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#include <library.h>
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/**
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* Pseudo random function, as in IKEv2 RFC 3.3.2.
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*
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* PRF algorithms not defined in IKEv2 are allocated in "private use" space.
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*/
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enum pseudo_random_function_t {
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PRF_UNDEFINED = 1024,
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/** RFC2104 */
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PRF_HMAC_MD5 = 1,
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/** RFC2104 */
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PRF_HMAC_SHA1 = 2,
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/** RFC2104 */
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PRF_HMAC_TIGER = 3,
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/** RFC4434 */
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PRF_AES128_XCBC = 4,
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/** RFC4868 */
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PRF_HMAC_SHA2_256 = 5,
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/** RFC4868. */
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PRF_HMAC_SHA2_384 = 6,
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/** RFC4868 */
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PRF_HMAC_SHA2_512 = 7,
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/** RFC4615 */
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PRF_AES128_CMAC = 8,
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/** FIPS 186-2-change1 */
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PRF_FIPS_SHA1_160 = 1025,
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/** FIPS 186-2-change1, uses fixed output size of 160bit */
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PRF_FIPS_DES = 1026,
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/** Keyed hash algorithm using SHA1, used in EAP-AKA:
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* This PRF uses SHA1, but XORs the key into the IV. No "Final()" operation
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* is applied to the SHA1 state. */
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PRF_KEYED_SHA1 = 1027,
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/** draft-kanno-ipsecme-camellia-xcbc, not yet assigned by IANA */
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PRF_CAMELLIA128_XCBC = 1028,
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};
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/**
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* enum name for encryption_algorithm_t.
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*/
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extern enum_name_t *pseudo_random_function_names;
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/**
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* Generic interface for pseudo-random-functions.
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*/
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struct prf_t {
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/**
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* Generates pseudo random bytes and writes them in the buffer.
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*
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* @param seed a chunk containing the seed for the next bytes
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* @param buffer pointer where the generated bytes will be written
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* @return TRUE if bytes generated successfully
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*/
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bool (*get_bytes)(prf_t *this, chunk_t seed,
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u_int8_t *buffer) __attribute__((warn_unused_result));
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/**
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* Generates pseudo random bytes and allocate space for them.
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*
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* @param seed a chunk containing the seed for the next bytes
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* @param chunk chunk which will hold generated bytes
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* @return TRUE if bytes allocated and generated successfully
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*/
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bool (*allocate_bytes)(prf_t *this, chunk_t seed,
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chunk_t *chunk) __attribute__((warn_unused_result));
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/**
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* Get the block size of this prf_t object.
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*
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* @return block size in bytes
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*/
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size_t (*get_block_size)(prf_t *this);
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/**
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* Get the key size of this prf_t object.
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*
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* This is a suggestion only, all implemented PRFs accept variable key
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* length.
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*
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* @return key size in bytes
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*/
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size_t (*get_key_size)(prf_t *this);
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/**
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* Set the key for this prf_t object.
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*
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* @param key key to set
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* @return TRUE if key set successfully
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*/
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bool (*set_key)(prf_t *this,
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chunk_t key) __attribute__((warn_unused_result));
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/**
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* Destroys a prf object.
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*/
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void (*destroy)(prf_t *this);
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};
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#endif /** PRF_H_ @}*/
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