129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
/*
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* Copyright (C) 2011 Tobias Brunner
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* HSR 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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#include "keymat.h"
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#include <sa/ikev1/keymat_v1.h>
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#include <sa/ikev2/keymat_v2.h>
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static keymat_constructor_t keymat_v1_ctor = NULL, keymat_v2_ctor = NULL;
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/**
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* See header
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*/
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keymat_t *keymat_create(ike_version_t version, bool initiator)
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{
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keymat_t *keymat = NULL;
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switch (version)
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{
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case IKEV1:
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#ifdef USE_IKEV1
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keymat = keymat_v1_ctor ? keymat_v1_ctor(initiator)
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: &keymat_v1_create(initiator)->keymat;
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#endif
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break;
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case IKEV2:
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#ifdef USE_IKEV2
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keymat = keymat_v2_ctor ? keymat_v2_ctor(initiator)
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: &keymat_v2_create(initiator)->keymat;
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#endif
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break;
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default:
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break;
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}
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return keymat;
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}
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/**
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* Implicit key length for an algorithm
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*/
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typedef struct {
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/** IKEv2 algorithm identifier */
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int alg;
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/** key length in bits */
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int len;
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} keylen_entry_t;
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/**
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* See header.
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*/
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int keymat_get_keylen_encr(encryption_algorithm_t alg)
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{
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keylen_entry_t map[] = {
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{ENCR_DES, 64},
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{ENCR_3DES, 192},
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{ENCR_CHACHA20_POLY1305, 256},
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};
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int i;
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for (i = 0; i < countof(map); i++)
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{
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if (map[i].alg == alg)
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{
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return map[i].len;
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}
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}
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return 0;
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}
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/**
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* See header.
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*/
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int keymat_get_keylen_integ(integrity_algorithm_t alg)
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{
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keylen_entry_t map[] = {
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{AUTH_HMAC_MD5_96, 128},
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{AUTH_HMAC_MD5_128, 128},
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{AUTH_HMAC_SHA1_96, 160},
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{AUTH_HMAC_SHA1_160, 160},
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{AUTH_HMAC_SHA2_256_96, 256},
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{AUTH_HMAC_SHA2_256_128, 256},
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{AUTH_HMAC_SHA2_384_192, 384},
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{AUTH_HMAC_SHA2_512_256, 512},
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{AUTH_AES_XCBC_96, 128},
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{AUTH_AES_CMAC_96, 128},
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};
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int i;
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for (i = 0; i < countof(map); i++)
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{
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if (map[i].alg == alg)
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{
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return map[i].len;
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}
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}
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return 0;
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}
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/**
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* See header.
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*/
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void keymat_register_constructor(ike_version_t version,
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keymat_constructor_t create)
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{
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switch (version)
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{
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case IKEV1:
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keymat_v1_ctor = create;
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break;
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case IKEV2:
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keymat_v2_ctor = create;
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break;
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default:
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break;
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}
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}
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