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/*
* Cryptographic helper function - calculate DH
*
* Copyright (C) 2006-2008 Michael C. Richardson <mcr@xelerance.com>
* Copyright (C) 2007-2009 Paul Wouters <paul@xelerance.com>
* Copyright (C) 2009 Avesh Agarwal <avagarwa@redhat.com>
* Copyright (C) 2009 David McCullough <david_mccullough@securecomputing.com>
* Copyright (C) 2012-2013 Paul Wouters <paul@libreswan.org>
* Copyright (C) 2015 Paul Wouters <pwouters@redaht.com>
* Copyright (C) 2017 Antony Antony <antony@phenome.org>
* Copyright (C) 2019 Andrew Cagney <cagney@gnu.org>
*
* 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 <https://www.gnu.org/licenses/gpl2.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.
*
* This code was developed with the support of IXIA communications.
*
*/
#include "ike_alg.h"
#include "ikev1_prf.h"
#include "crypt_dh.h"
#include "crypt_symkey.h"
#include "crypt_hash.h"
#include "keys.h"
#include "defs.h"
#include "log.h"
#include "state.h"
/* Generate the SKEYID_* and new IV
* See draft-ietf-ipsec-ike-01.txt 4.1
*/
/* MUST BE THREAD-SAFE */
static void calc_skeyids_iv(oakley_auth_t auth, chunk_t pss,
const struct prf_desc *prf_desc,
const struct encrypt_desc *encrypter,
chunk_t ni, chunk_t nr,
chunk_t icookie, chunk_t rcookie,
chunk_t gi, chunk_t gr,
/*const*/ PK11SymKey *shared, /* NSS doesn't do const */
const size_t keysize, /* = st->st_oakley.enckeylen/BITS_PER_BYTE; */
PK11SymKey **skeyid_out, /* output */
PK11SymKey **skeyid_d_out, /* output */
PK11SymKey **skeyid_a_out, /* output */
PK11SymKey **skeyid_e_out, /* output */
struct crypt_mac *new_iv, /* output */
PK11SymKey **enc_key_out, /* output */
struct logger *logger)
{
const struct hash_desc *hasher = prf_desc ? prf_desc->hasher : NULL;
/* Generate the SKEYID */
PK11SymKey *skeyid;
switch (auth) {
case OAKLEY_PRESHARED_KEY:
skeyid = ikev1_pre_shared_key_skeyid(prf_desc, pss,
ni, nr, logger);
break;
case OAKLEY_RSA_SIG:
skeyid = ikev1_signature_skeyid(prf_desc, ni, nr, shared, logger);
break;
/* Not implemented */
case OAKLEY_DSS_SIG:
case OAKLEY_RSA_ENC:
case OAKLEY_RSA_REVISED_MODE:
case OAKLEY_ECDSA_P256:
case OAKLEY_ECDSA_P384:
case OAKLEY_ECDSA_P521:
default:
bad_case(auth);
}
/* generate SKEYID_* from SKEYID */
PK11SymKey *skeyid_d = ikev1_skeyid_d(prf_desc, skeyid, shared,
icookie, rcookie,
logger);
PK11SymKey *skeyid_a = ikev1_skeyid_a(prf_desc, skeyid, skeyid_d,
shared, icookie, rcookie,
logger);
PK11SymKey *skeyid_e = ikev1_skeyid_e(prf_desc, skeyid, skeyid_a,
shared, icookie, rcookie,
logger);
PK11SymKey *enc_key = ikev1_appendix_b_keymat_e(prf_desc, encrypter,
skeyid_e, keysize,
logger);
*skeyid_out = skeyid;
*skeyid_d_out = skeyid_d;
*skeyid_a_out = skeyid_a;
*skeyid_e_out = skeyid_e;
*enc_key_out = enc_key;
DBGF(DBG_CRYPT, "NSS: pointers skeyid_d %p, skeyid_a %p, skeyid_e %p, enc_key %p",
skeyid_d, skeyid_a, skeyid_e, enc_key);
/* generate IV */
{
if (DBGP(DBG_CRYPT)) {
DBG_dump_hunk("DH_i:", gi);
DBG_dump_hunk("DH_r:", gr);
}
struct crypt_hash *ctx = crypt_hash_init("new IV", hasher, logger);
crypt_hash_digest_hunk(ctx, "GI", gi);
crypt_hash_digest_hunk(ctx, "GR", gr);
*new_iv = crypt_hash_final_mac(&ctx);
}
}
void calc_v1_skeyid_and_iv(struct state *st)
{
const chunk_t *pss = get_connection_psk(st->st_connection, st->st_logger);
calc_skeyids_iv(st->st_oakley.auth, pss != NULL ? *pss : empty_chunk,
st->st_oakley.ta_prf, st->st_oakley.ta_encrypt,
st->st_ni, st->st_nr,
chunk2(st->st_ike_spis.initiator.bytes, COOKIE_SIZE),
chunk2(st->st_ike_spis.responder.bytes, COOKIE_SIZE),
st->st_gi, st->st_gr,
st->st_dh_shared_secret,
st->st_oakley.enckeylen / BITS_PER_BYTE,
&st->st_skeyid_nss, /* output */
&st->st_skeyid_d_nss, /* output */
&st->st_skeyid_a_nss, /* output */
&st->st_skeyid_e_nss, /* output */
&st->st_v1_new_iv, /* output */
&st->st_enc_key_nss, /* output */
st->st_logger);
st->hidden_variables.st_skeyid_calculated = true;
}
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