630 lines
16 KiB
C
630 lines
16 KiB
C
/*
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* Copyright (C) 2008-2013 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 <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_EC
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#include <openssl/bn.h>
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#include <openssl/ec.h>
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#include <openssl/objects.h>
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#include <openssl/bn.h>
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#include "openssl_ec_diffie_hellman.h"
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#include "openssl_util.h"
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#include <utils/debug.h>
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typedef struct private_openssl_ec_diffie_hellman_t private_openssl_ec_diffie_hellman_t;
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/**
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* Private data of an openssl_ec_diffie_hellman_t object.
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*/
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struct private_openssl_ec_diffie_hellman_t {
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/**
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* Public openssl_ec_diffie_hellman_t interface.
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*/
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openssl_ec_diffie_hellman_t public;
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/**
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* Diffie Hellman group number.
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*/
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diffie_hellman_group_t group;
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/**
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* EC private (public) key
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*/
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EC_KEY *key;
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/**
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* EC group
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*/
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const EC_GROUP *ec_group;
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/**
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* Other public key
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*/
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EC_POINT *pub_key;
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/**
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* Shared secret
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*/
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chunk_t shared_secret;
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/**
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* True if shared secret is computed
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*/
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bool computed;
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};
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/**
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* Convert a chunk to an EC_POINT (which must already exist). The x and y
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* coordinates of the point have to be concatenated in the chunk.
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*/
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static bool chunk2ecp(const EC_GROUP *group, chunk_t chunk, EC_POINT *point)
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{
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BN_CTX *ctx;
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BIGNUM *x, *y;
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bool ret = FALSE;
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ctx = BN_CTX_new();
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if (!ctx)
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{
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return FALSE;
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}
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BN_CTX_start(ctx);
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x = BN_CTX_get(ctx);
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y = BN_CTX_get(ctx);
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if (!x || !y)
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{
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goto error;
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}
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if (!openssl_bn_split(chunk, x, y))
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{
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goto error;
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}
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if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx))
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{
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goto error;
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}
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if (!EC_POINT_is_on_curve(group, point, ctx))
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{
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goto error;
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}
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ret = TRUE;
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error:
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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return ret;
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}
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/**
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* Convert an EC_POINT to a chunk by concatenating the x and y coordinates of
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* the point. This function allocates memory for the chunk.
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*/
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static bool ecp2chunk(const EC_GROUP *group, const EC_POINT *point,
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chunk_t *chunk)
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{
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BN_CTX *ctx;
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BIGNUM *x, *y;
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bool ret = FALSE;
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ctx = BN_CTX_new();
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if (!ctx)
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{
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return FALSE;
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}
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BN_CTX_start(ctx);
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x = BN_CTX_get(ctx);
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y = BN_CTX_get(ctx);
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if (!x || !y)
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{
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goto error;
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}
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if (!EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx))
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{
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goto error;
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}
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if (!openssl_bn_cat(EC_FIELD_ELEMENT_LEN(group), x, y, chunk))
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{
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goto error;
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}
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ret = TRUE;
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error:
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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return ret;
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}
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/**
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* Compute the shared secret.
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*/
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static bool compute_shared_key(private_openssl_ec_diffie_hellman_t *this,
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chunk_t *shared_secret)
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{
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int len;
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*shared_secret = chunk_alloc(EC_FIELD_ELEMENT_LEN(this->ec_group));
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len = ECDH_compute_key(shared_secret->ptr, shared_secret->len,
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this->pub_key, this->key, NULL);
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if (len <= 0)
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{
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chunk_free(shared_secret);
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return FALSE;
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}
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shared_secret->len = len;
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return TRUE;
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}
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METHOD(diffie_hellman_t, set_other_public_value, bool,
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private_openssl_ec_diffie_hellman_t *this, chunk_t value)
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{
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if (!diffie_hellman_verify_value(this->group, value))
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{
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return FALSE;
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}
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if (!chunk2ecp(this->ec_group, value, this->pub_key))
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{
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DBG1(DBG_LIB, "ECDH public value is malformed");
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return FALSE;
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}
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chunk_clear(&this->shared_secret);
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if (!compute_shared_key(this, &this->shared_secret)) {
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DBG1(DBG_LIB, "ECDH shared secret computation failed");
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return FALSE;
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}
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this->computed = TRUE;
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return TRUE;
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}
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METHOD(diffie_hellman_t, get_my_public_value, bool,
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private_openssl_ec_diffie_hellman_t *this,chunk_t *value)
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{
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ecp2chunk(this->ec_group, EC_KEY_get0_public_key(this->key), value);
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return TRUE;
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}
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METHOD(diffie_hellman_t, set_private_value, bool,
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private_openssl_ec_diffie_hellman_t *this, chunk_t value)
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{
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EC_POINT *pub = NULL;
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BIGNUM *priv = NULL;
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bool ret = FALSE;
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priv = BN_bin2bn(value.ptr, value.len, NULL);
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if (!priv)
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{
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goto error;
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}
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pub = EC_POINT_new(EC_KEY_get0_group(this->key));
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if (!pub)
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{
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goto error;
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}
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if (EC_POINT_mul(this->ec_group, pub, priv, NULL, NULL, NULL) != 1)
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{
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goto error;
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}
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if (EC_KEY_set_private_key(this->key, priv) != 1)
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{
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goto error;
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}
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if (EC_KEY_set_public_key(this->key, pub) != 1)
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{
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goto error;
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}
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ret = TRUE;
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error:
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if (pub)
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{
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EC_POINT_free(pub);
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}
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if (priv)
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{
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BN_free(priv);
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}
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return ret;
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}
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METHOD(diffie_hellman_t, get_shared_secret, bool,
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private_openssl_ec_diffie_hellman_t *this, chunk_t *secret)
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{
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if (!this->computed)
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{
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return FALSE;
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}
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*secret = chunk_clone(this->shared_secret);
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return TRUE;
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}
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METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t,
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private_openssl_ec_diffie_hellman_t *this)
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{
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return this->group;
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}
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METHOD(diffie_hellman_t, destroy, void,
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private_openssl_ec_diffie_hellman_t *this)
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{
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if (this->pub_key)
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{
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EC_POINT_clear_free(this->pub_key);
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}
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if (this->key)
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{
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EC_KEY_free(this->key);
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}
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chunk_clear(&this->shared_secret);
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free(this);
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}
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/**
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* ECC Brainpool curves are not available in OpenSSL releases < 1.0.2, but we
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* don't check the version in case somebody backported them.
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*
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* BoringSSL defines the constants but not the curves.
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*/
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#if (!defined(NID_brainpoolP224r1) || !defined(NID_brainpoolP256r1) || \
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!defined(NID_brainpoolP384r1) || !defined(NID_brainpoolP512r1) || \
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defined(OPENSSL_IS_BORINGSSL))
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/**
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* Parameters for ECC Brainpool curves
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*/
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typedef struct {
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/** DH group */
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diffie_hellman_group_t group;
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/** The prime p specifying the base field */
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const chunk_t p;
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/** Coefficient a of the elliptic curve E: y^2 = x^3 + ax + b (mod p) */
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const chunk_t a;
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/** Coefficient b */
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const chunk_t b;
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/** x coordinate of base point G (a point in E of prime order) */
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const chunk_t x;
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/** y coordinate of base point G */
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const chunk_t y;
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/** Prime order q of the group generated by G */
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const chunk_t q;
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} bp_curve;
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/**
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* List of ECC Brainpool curves
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*/
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static bp_curve bp_curves[] = {
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{
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/* ECC Brainpool 224-bit curve (RFC 5639), brainpoolP224r1 */
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.group = ECP_224_BP,
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.p = chunk_from_chars(
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0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD1,0xD7,0x87,
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0xB0,0x9F,0x07,0x57,0x97,0xDA,0x89,0xF5,0x7E,0xC8,0xC0,0xFF),
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.a = chunk_from_chars(
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0x68,0xA5,0xE6,0x2C,0xA9,0xCE,0x6C,0x1C,0x29,0x98,0x03,0xA6,0xC1,0x53,0x0B,0x51,
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0x4E,0x18,0x2A,0xD8,0xB0,0x04,0x2A,0x59,0xCA,0xD2,0x9F,0x43),
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.b = chunk_from_chars(
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0x25,0x80,0xF6,0x3C,0xCF,0xE4,0x41,0x38,0x87,0x07,0x13,0xB1,0xA9,0x23,0x69,0xE3,
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0x3E,0x21,0x35,0xD2,0x66,0xDB,0xB3,0x72,0x38,0x6C,0x40,0x0B),
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.x = chunk_from_chars(
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0x0D,0x90,0x29,0xAD,0x2C,0x7E,0x5C,0xF4,0x34,0x08,0x23,0xB2,0xA8,0x7D,0xC6,0x8C,
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0x9E,0x4C,0xE3,0x17,0x4C,0x1E,0x6E,0xFD,0xEE,0x12,0xC0,0x7D),
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.y = chunk_from_chars(
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0x58,0xAA,0x56,0xF7,0x72,0xC0,0x72,0x6F,0x24,0xC6,0xB8,0x9E,0x4E,0xCD,0xAC,0x24,
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0x35,0x4B,0x9E,0x99,0xCA,0xA3,0xF6,0xD3,0x76,0x14,0x02,0xCD),
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.q = chunk_from_chars(
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0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD0,0xFB,0x98,
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0xD1,0x16,0xBC,0x4B,0x6D,0xDE,0xBC,0xA3,0xA5,0xA7,0x93,0x9F),
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},
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{
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/* ECC Brainpool 256-bit curve (RFC 5639), brainpoolP256r1 */
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.group = ECP_256_BP,
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.p = chunk_from_chars(
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0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x72,
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0x6E,0x3B,0xF6,0x23,0xD5,0x26,0x20,0x28,0x20,0x13,0x48,0x1D,0x1F,0x6E,0x53,0x77),
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.a = chunk_from_chars(
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0x7D,0x5A,0x09,0x75,0xFC,0x2C,0x30,0x57,0xEE,0xF6,0x75,0x30,0x41,0x7A,0xFF,0xE7,
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0xFB,0x80,0x55,0xC1,0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9),
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.b = chunk_from_chars(
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0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9,0xBB,0xD7,0x7C,0xBF,
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0x95,0x84,0x16,0x29,0x5C,0xF7,0xE1,0xCE,0x6B,0xCC,0xDC,0x18,0xFF,0x8C,0x07,0xB6),
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.x = chunk_from_chars(
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0x8B,0xD2,0xAE,0xB9,0xCB,0x7E,0x57,0xCB,0x2C,0x4B,0x48,0x2F,0xFC,0x81,0xB7,0xAF,
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0xB9,0xDE,0x27,0xE1,0xE3,0xBD,0x23,0xC2,0x3A,0x44,0x53,0xBD,0x9A,0xCE,0x32,0x62),
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.y = chunk_from_chars(
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0x54,0x7E,0xF8,0x35,0xC3,0xDA,0xC4,0xFD,0x97,0xF8,0x46,0x1A,0x14,0x61,0x1D,0xC9,
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0xC2,0x77,0x45,0x13,0x2D,0xED,0x8E,0x54,0x5C,0x1D,0x54,0xC7,0x2F,0x04,0x69,0x97),
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.q = chunk_from_chars(
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0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x71,
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0x8C,0x39,0x7A,0xA3,0xB5,0x61,0xA6,0xF7,0x90,0x1E,0x0E,0x82,0x97,0x48,0x56,0xA7),
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},
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{
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/* ECC Brainpool 384-bit curve (RFC 5639), brainpoolP384r1 */
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.group = ECP_384_BP,
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.p = chunk_from_chars(
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0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF,
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0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB4,0x12,0xB1,0xDA,0x19,0x7F,0xB7,0x11,0x23,
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0xAC,0xD3,0xA7,0x29,0x90,0x1D,0x1A,0x71,0x87,0x47,0x00,0x13,0x31,0x07,0xEC,0x53),
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.a = chunk_from_chars(
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0x7B,0xC3,0x82,0xC6,0x3D,0x8C,0x15,0x0C,0x3C,0x72,0x08,0x0A,0xCE,0x05,0xAF,0xA0,
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0xC2,0xBE,0xA2,0x8E,0x4F,0xB2,0x27,0x87,0x13,0x91,0x65,0xEF,0xBA,0x91,0xF9,0x0F,
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0x8A,0xA5,0x81,0x4A,0x50,0x3A,0xD4,0xEB,0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26),
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.b = chunk_from_chars(
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0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26,0x8B,0x39,0xB5,0x54,0x16,0xF0,0x44,0x7C,
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0x2F,0xB7,0x7D,0xE1,0x07,0xDC,0xD2,0xA6,0x2E,0x88,0x0E,0xA5,0x3E,0xEB,0x62,0xD5,
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0x7C,0xB4,0x39,0x02,0x95,0xDB,0xC9,0x94,0x3A,0xB7,0x86,0x96,0xFA,0x50,0x4C,0x11),
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.x = chunk_from_chars(
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0x1D,0x1C,0x64,0xF0,0x68,0xCF,0x45,0xFF,0xA2,0xA6,0x3A,0x81,0xB7,0xC1,0x3F,0x6B,
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0x88,0x47,0xA3,0xE7,0x7E,0xF1,0x4F,0xE3,0xDB,0x7F,0xCA,0xFE,0x0C,0xBD,0x10,0xE8,
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0xE8,0x26,0xE0,0x34,0x36,0xD6,0x46,0xAA,0xEF,0x87,0xB2,0xE2,0x47,0xD4,0xAF,0x1E),
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.y = chunk_from_chars(
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0x8A,0xBE,0x1D,0x75,0x20,0xF9,0xC2,0xA4,0x5C,0xB1,0xEB,0x8E,0x95,0xCF,0xD5,0x52,
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0x62,0xB7,0x0B,0x29,0xFE,0xEC,0x58,0x64,0xE1,0x9C,0x05,0x4F,0xF9,0x91,0x29,0x28,
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0x0E,0x46,0x46,0x21,0x77,0x91,0x81,0x11,0x42,0x82,0x03,0x41,0x26,0x3C,0x53,0x15),
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.q = chunk_from_chars(
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0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF,
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0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB3,0x1F,0x16,0x6E,0x6C,0xAC,0x04,0x25,0xA7,
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0xCF,0x3A,0xB6,0xAF,0x6B,0x7F,0xC3,0x10,0x3B,0x88,0x32,0x02,0xE9,0x04,0x65,0x65),
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},
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{
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/* ECC Brainpool 512-bit curve (RFC 5639), brainpoolP512r1 */
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.group = ECP_512_BP,
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.p = chunk_from_chars(
|
|
0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07,
|
|
0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x71,
|
|
0x7D,0x4D,0x9B,0x00,0x9B,0xC6,0x68,0x42,0xAE,0xCD,0xA1,0x2A,0xE6,0xA3,0x80,0xE6,
|
|
0x28,0x81,0xFF,0x2F,0x2D,0x82,0xC6,0x85,0x28,0xAA,0x60,0x56,0x58,0x3A,0x48,0xF3),
|
|
.a = chunk_from_chars(
|
|
0x78,0x30,0xA3,0x31,0x8B,0x60,0x3B,0x89,0xE2,0x32,0x71,0x45,0xAC,0x23,0x4C,0xC5,
|
|
0x94,0xCB,0xDD,0x8D,0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC,
|
|
0x2D,0xED,0x5D,0x5A,0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5,
|
|
0x7F,0x11,0x17,0xA7,0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA),
|
|
.b = chunk_from_chars(
|
|
0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC,0x2D,0xED,0x5D,0x5A,
|
|
0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5,0x7F,0x11,0x17,0xA7,
|
|
0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA,0xDC,0x08,0x3E,0x67,
|
|
0x98,0x40,0x50,0xB7,0x5E,0xBA,0xE5,0xDD,0x28,0x09,0xBD,0x63,0x80,0x16,0xF7,0x23),
|
|
.x = chunk_from_chars(
|
|
0x81,0xAE,0xE4,0xBD,0xD8,0x2E,0xD9,0x64,0x5A,0x21,0x32,0x2E,0x9C,0x4C,0x6A,0x93,
|
|
0x85,0xED,0x9F,0x70,0xB5,0xD9,0x16,0xC1,0xB4,0x3B,0x62,0xEE,0xF4,0xD0,0x09,0x8E,
|
|
0xFF,0x3B,0x1F,0x78,0xE2,0xD0,0xD4,0x8D,0x50,0xD1,0x68,0x7B,0x93,0xB9,0x7D,0x5F,
|
|
0x7C,0x6D,0x50,0x47,0x40,0x6A,0x5E,0x68,0x8B,0x35,0x22,0x09,0xBC,0xB9,0xF8,0x22),
|
|
.y = chunk_from_chars(
|
|
0x7D,0xDE,0x38,0x5D,0x56,0x63,0x32,0xEC,0xC0,0xEA,0xBF,0xA9,0xCF,0x78,0x22,0xFD,
|
|
0xF2,0x09,0xF7,0x00,0x24,0xA5,0x7B,0x1A,0xA0,0x00,0xC5,0x5B,0x88,0x1F,0x81,0x11,
|
|
0xB2,0xDC,0xDE,0x49,0x4A,0x5F,0x48,0x5E,0x5B,0xCA,0x4B,0xD8,0x8A,0x27,0x63,0xAE,
|
|
0xD1,0xCA,0x2B,0x2F,0xA8,0xF0,0x54,0x06,0x78,0xCD,0x1E,0x0F,0x3A,0xD8,0x08,0x92),
|
|
.q = chunk_from_chars(
|
|
0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07,
|
|
0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x70,
|
|
0x55,0x3E,0x5C,0x41,0x4C,0xA9,0x26,0x19,0x41,0x86,0x61,0x19,0x7F,0xAC,0x10,0x47,
|
|
0x1D,0xB1,0xD3,0x81,0x08,0x5D,0xDA,0xDD,0xB5,0x87,0x96,0x82,0x9C,0xA9,0x00,0x69),
|
|
},
|
|
};
|
|
|
|
/**
|
|
* Create an EC_GROUP object for an ECC Brainpool curve
|
|
*/
|
|
EC_GROUP *ec_group_new_brainpool(bp_curve *curve)
|
|
{
|
|
BIGNUM *p, *a, *b, *x, *y, *q;
|
|
const BIGNUM *h;
|
|
EC_POINT *G = NULL;
|
|
EC_GROUP *group = NULL, *result = NULL;
|
|
BN_CTX *ctx = NULL;
|
|
|
|
ctx = BN_CTX_new();
|
|
p = BN_bin2bn(curve->p.ptr, curve->p.len, NULL);
|
|
a = BN_bin2bn(curve->a.ptr, curve->a.len, NULL);
|
|
b = BN_bin2bn(curve->b.ptr, curve->b.len, NULL);
|
|
x = BN_bin2bn(curve->x.ptr, curve->x.len, NULL);
|
|
y = BN_bin2bn(curve->y.ptr, curve->y.len, NULL);
|
|
q = BN_bin2bn(curve->q.ptr, curve->q.len, NULL);
|
|
/* all supported groups have a cofactor of 1 */
|
|
h = BN_value_one();
|
|
if (!ctx || !p || !a || !b || !x || !y || !q)
|
|
{
|
|
goto failed;
|
|
}
|
|
group = EC_GROUP_new_curve_GFp(p, a, b, ctx);
|
|
if (!group)
|
|
{
|
|
goto failed;
|
|
}
|
|
G = EC_POINT_new(group);
|
|
if (!G || !EC_POINT_set_affine_coordinates_GFp(group, G, x, y, ctx))
|
|
{
|
|
goto failed;
|
|
}
|
|
if (!EC_GROUP_set_generator(group, G, q, h))
|
|
{
|
|
goto failed;
|
|
}
|
|
result = group;
|
|
|
|
failed:
|
|
if (!result && group)
|
|
{
|
|
EC_GROUP_free(group);
|
|
}
|
|
if (G)
|
|
{
|
|
EC_POINT_free(G);
|
|
}
|
|
BN_CTX_free(ctx);
|
|
BN_free(p);
|
|
BN_free(a);
|
|
BN_free(b);
|
|
BN_free(x);
|
|
BN_free(y);
|
|
BN_free(q);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Create an EC_KEY for ECC Brainpool curves as defined above
|
|
*/
|
|
static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group)
|
|
{
|
|
bp_curve *curve = NULL;
|
|
EC_GROUP *ec_group;
|
|
EC_KEY *key = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < countof(bp_curves); i++)
|
|
{
|
|
if (bp_curves[i].group == group)
|
|
{
|
|
curve = &bp_curves[i];
|
|
}
|
|
}
|
|
if (!curve)
|
|
{
|
|
return NULL;
|
|
}
|
|
ec_group = ec_group_new_brainpool(curve);
|
|
if (!ec_group)
|
|
{
|
|
return NULL;
|
|
}
|
|
key = EC_KEY_new();
|
|
if (!key || !EC_KEY_set_group(key, ec_group))
|
|
{
|
|
EC_KEY_free(key);
|
|
key = NULL;
|
|
}
|
|
EC_GROUP_free(ec_group);
|
|
return key;
|
|
}
|
|
|
|
#else /* !NID_brainpoolP224r1 || ... */
|
|
|
|
/**
|
|
* Create an EC_KEY for ECC Brainpool curves as defined by OpenSSL
|
|
*/
|
|
static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group)
|
|
{
|
|
switch (group)
|
|
{
|
|
case ECP_224_BP:
|
|
return EC_KEY_new_by_curve_name(NID_brainpoolP224r1);
|
|
case ECP_256_BP:
|
|
return EC_KEY_new_by_curve_name(NID_brainpoolP256r1);
|
|
case ECP_384_BP:
|
|
return EC_KEY_new_by_curve_name(NID_brainpoolP384r1);
|
|
case ECP_512_BP:
|
|
return EC_KEY_new_by_curve_name(NID_brainpoolP512r1);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
#endif /* !NID_brainpoolP224r1 || ... */
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
openssl_ec_diffie_hellman_t *openssl_ec_diffie_hellman_create(diffie_hellman_group_t group)
|
|
{
|
|
private_openssl_ec_diffie_hellman_t *this;
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.dh = {
|
|
.get_shared_secret = _get_shared_secret,
|
|
.set_other_public_value = _set_other_public_value,
|
|
.get_my_public_value = _get_my_public_value,
|
|
.set_private_value = _set_private_value,
|
|
.get_dh_group = _get_dh_group,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.group = group,
|
|
);
|
|
|
|
switch (group)
|
|
{
|
|
case ECP_192_BIT:
|
|
this->key = EC_KEY_new_by_curve_name(NID_X9_62_prime192v1);
|
|
break;
|
|
case ECP_224_BIT:
|
|
this->key = EC_KEY_new_by_curve_name(NID_secp224r1);
|
|
break;
|
|
case ECP_256_BIT:
|
|
this->key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
|
|
break;
|
|
case ECP_384_BIT:
|
|
this->key = EC_KEY_new_by_curve_name(NID_secp384r1);
|
|
break;
|
|
case ECP_521_BIT:
|
|
this->key = EC_KEY_new_by_curve_name(NID_secp521r1);
|
|
break;
|
|
case ECP_224_BP:
|
|
case ECP_256_BP:
|
|
case ECP_384_BP:
|
|
case ECP_512_BP:
|
|
this->key = ec_key_new_brainpool(group);
|
|
break;
|
|
default:
|
|
this->key = NULL;
|
|
break;
|
|
}
|
|
|
|
if (!this->key)
|
|
{
|
|
free(this);
|
|
return NULL;
|
|
}
|
|
|
|
/* caching the EC group */
|
|
this->ec_group = EC_KEY_get0_group(this->key);
|
|
|
|
this->pub_key = EC_POINT_new(this->ec_group);
|
|
if (!this->pub_key)
|
|
{
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
|
|
/* generate an EC private (public) key */
|
|
if (!EC_KEY_generate_key(this->key))
|
|
{
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
|
|
return &this->public;
|
|
}
|
|
#endif /* OPENSSL_NO_EC */
|