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