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/*
* Copyright (c) 2010-2012 Frank Morgner and Dominik Oepen
*
* This file is part of OpenPACE.
*
* OpenPACE 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 3 of the License, or (at your option)
* any later version.
*
* OpenPACE 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.
*
* You should have received a copy of the GNU General Public License along with
* OpenPACE. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file pace.c
* @brief OpenPACE implementation
*
* @author Frank Morgner <frankmorgner@gmail.com>
* @author Dominik Oepen <oepen@informatik.hu-berlin.de>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "eac_err.h"
#include "eac_kdf.h"
#include "eac_lib.h"
#include "eac_util.h"
#include "misc.h"
#include "pace_mappings.h"
#include <eac/eac.h>
#include <eac/pace.h>
#include <openssl/crypto.h>
#include <openssl/ecdh.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <string.h>
BUF_MEM *
PACE_STEP1_enc_nonce(const EAC_CTX * ctx, const PACE_SEC * pi)
{
BUF_MEM * enc_nonce = NULL;
BUF_MEM * key = NULL;
check((ctx && ctx->pace_ctx && ctx->pace_ctx->ka_ctx &&
ctx->pace_ctx->ka_ctx->cipher),
"Invalid arguments");
key = kdf_pi(pi, NULL, ctx->pace_ctx->ka_ctx, ctx->md_ctx);
check(key, "Key derivation function failed");
BUF_MEM_clear_free(ctx->pace_ctx->nonce);
ctx->pace_ctx->nonce = randb(EVP_CIPHER_block_size(ctx->pace_ctx->ka_ctx->cipher));
check(ctx->pace_ctx->nonce, "Failed to create nonce");
enc_nonce = cipher_no_pad(ctx->pace_ctx->ka_ctx, ctx->cipher_ctx, key, ctx->pace_ctx->nonce, 1);
err:
BUF_MEM_clear_free(key);
return enc_nonce;
}
int
PACE_STEP2_dec_nonce(const EAC_CTX * ctx, const PACE_SEC * pi,
const BUF_MEM * enc_nonce)
{
BUF_MEM *key = NULL;
int r = 0;
check((ctx && ctx->pace_ctx && ctx->pace_ctx->ka_ctx && ctx->pace_ctx->ka_ctx->cipher),
"Invalid arguments");
key = kdf_pi(pi, NULL, ctx->pace_ctx->ka_ctx, ctx->md_ctx);
check(key, "Key derivation function failed");
BUF_MEM_clear_free(ctx->pace_ctx->nonce);
ctx->pace_ctx->nonce = cipher_no_pad(ctx->pace_ctx->ka_ctx, ctx->cipher_ctx, key, enc_nonce, 0);
check(ctx->pace_ctx->nonce, "Failed to decrypt nonce");
r = 1;
err:
BUF_MEM_clear_free(key);
return r;
}
BUF_MEM *
PACE_STEP3A_generate_mapping_data(const EAC_CTX * ctx)
{
check_return((ctx && ctx->pace_ctx && ctx->pace_ctx->map_generate_key), "Invalid arguments");
return ctx->pace_ctx->map_generate_key(ctx->pace_ctx, ctx->bn_ctx);
}
int
PACE_STEP3A_map_generator(const EAC_CTX * ctx, const BUF_MEM * in)
{
if(!ctx || !ctx->pace_ctx || !ctx->pace_ctx->map_compute_key) {
log_err("Invalid arguments");
return 0;
}
return ctx->pace_ctx->map_compute_key(ctx->pace_ctx, ctx->pace_ctx->nonce, in, ctx->bn_ctx);
}
BUF_MEM *
PACE_STEP3B_generate_ephemeral_key(EAC_CTX * ctx)
{
check_return((ctx && ctx->pace_ctx), "Invalid arguments");
ctx->pace_ctx->my_eph_pubkey = KA_CTX_generate_key(ctx->pace_ctx->ka_ctx,
ctx->bn_ctx);
if (!ctx->pace_ctx->my_eph_pubkey)
return NULL;
return BUF_MEM_create_init(ctx->pace_ctx->my_eph_pubkey->data,
ctx->pace_ctx->my_eph_pubkey->length);
}
int
PACE_STEP3B_compute_shared_secret(const EAC_CTX * ctx, const BUF_MEM * in)
{
int r = 0;
check((ctx && ctx->pace_ctx && ctx->pace_ctx->ka_ctx
&& ctx->pace_ctx->ka_ctx->compute_key && in), "Invalid arguments");
/* Check if the new public key is different from the other party's public
* key. Note that this check is only required since TR-03110 v2.02, but it
* makes sense to always check this... */
if (!ctx->pace_ctx->my_eph_pubkey
|| (in->length == ctx->pace_ctx->my_eph_pubkey->length
&& memcmp(in->data, ctx->pace_ctx->my_eph_pubkey->data,
in->length) == 0)) {
log_err("Bad DH or ECKEY object");
goto err;
}
check(KA_CTX_compute_key(ctx->pace_ctx->ka_ctx, in, ctx->bn_ctx),
"Failed to compute shared secret");
r = 1;
err:
return r;
}
int
PACE_STEP3C_derive_keys(const EAC_CTX *ctx)
{
if (!ctx || !ctx->pace_ctx) {
log_err("Invalid arguments");
return 0;
}
return KA_CTX_derive_keys(ctx->pace_ctx->ka_ctx, NULL, ctx->md_ctx);
}
BUF_MEM *
PACE_STEP3D_compute_authentication_token(const EAC_CTX *ctx, const BUF_MEM *pub)
{
if (!ctx || !ctx->pace_ctx) {
log_err("Invalid arguments");
return NULL;
}
return get_authentication_token(ctx->pace_ctx->protocol,
ctx->pace_ctx->ka_ctx, ctx->bn_ctx,
ctx->tr_version, pub);
}
int
PACE_STEP3D_verify_authentication_token(const EAC_CTX *ctx, const BUF_MEM *token)
{
if (!ctx || !token|| !ctx->pace_ctx) {
log_err("Invalid arguments");
return -1;
}
return verify_authentication_token(ctx->pace_ctx->protocol,
ctx->pace_ctx->ka_ctx, ctx->bn_ctx, ctx->tr_version,
token);
}
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