pineapple-src/externals/libressl/crypto/ec/ec_key.c
2022-04-24 22:29:35 +02:00

571 lines
13 KiB
C
Executable file

/* $OpenBSD: ec_key.c,v 1.26 2021/04/20 17:23:37 tb Exp $ */
/*
* Written by Nils Larsch for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* Portions originally developed by SUN MICROSYSTEMS, INC., and
* contributed to the OpenSSL project.
*/
#include <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/err.h>
#include "bn_lcl.h"
#include "ec_lcl.h"
EC_KEY *
EC_KEY_new(void)
{
return EC_KEY_new_method(NULL);
}
EC_KEY *
EC_KEY_new_by_curve_name(int nid)
{
EC_KEY *ret = EC_KEY_new();
if (ret == NULL)
return NULL;
ret->group = EC_GROUP_new_by_curve_name(nid);
if (ret->group == NULL) {
EC_KEY_free(ret);
return NULL;
}
if (ret->meth->set_group != NULL &&
ret->meth->set_group(ret, ret->group) == 0) {
EC_KEY_free(ret);
return NULL;
}
return ret;
}
void
EC_KEY_free(EC_KEY * r)
{
int i;
if (r == NULL)
return;
i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC);
if (i > 0)
return;
if (r->meth != NULL && r->meth->finish != NULL)
r->meth->finish(r);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(r->engine);
#endif
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
EC_GROUP_free(r->group);
EC_POINT_free(r->pub_key);
BN_clear_free(r->priv_key);
EC_EX_DATA_free_all_data(&r->method_data);
freezero(r, sizeof(EC_KEY));
}
EC_KEY *
EC_KEY_copy(EC_KEY * dest, const EC_KEY * src)
{
EC_EXTRA_DATA *d;
if (dest == NULL || src == NULL) {
ECerror(ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (src->meth != dest->meth) {
if (dest->meth != NULL && dest->meth->finish != NULL)
dest->meth->finish(dest);
#ifndef OPENSSL_NO_ENGINE
if (ENGINE_finish(dest->engine) == 0)
return 0;
dest->engine = NULL;
#endif
}
/* copy the parameters */
if (src->group) {
const EC_METHOD *meth = EC_GROUP_method_of(src->group);
/* clear the old group */
EC_GROUP_free(dest->group);
dest->group = EC_GROUP_new(meth);
if (dest->group == NULL)
return NULL;
if (!EC_GROUP_copy(dest->group, src->group))
return NULL;
}
/* copy the public key */
if (src->pub_key && src->group) {
EC_POINT_free(dest->pub_key);
dest->pub_key = EC_POINT_new(src->group);
if (dest->pub_key == NULL)
return NULL;
if (!EC_POINT_copy(dest->pub_key, src->pub_key))
return NULL;
}
/* copy the private key */
if (src->priv_key) {
if (dest->priv_key == NULL) {
dest->priv_key = BN_new();
if (dest->priv_key == NULL)
return NULL;
}
if (!BN_copy(dest->priv_key, src->priv_key))
return NULL;
}
/* copy method/extra data */
EC_EX_DATA_free_all_data(&dest->method_data);
for (d = src->method_data; d != NULL; d = d->next) {
void *t = d->dup_func(d->data);
if (t == NULL)
return 0;
if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func,
d->free_func, d->clear_free_func))
return 0;
}
/* copy the rest */
dest->enc_flag = src->enc_flag;
dest->conv_form = src->conv_form;
dest->version = src->version;
dest->flags = src->flags;
if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, &dest->ex_data,
&((EC_KEY *)src)->ex_data)) /* XXX const */
return NULL;
if (src->meth != dest->meth) {
#ifndef OPENSSL_NO_ENGINE
if (src->engine != NULL && ENGINE_init(src->engine) == 0)
return 0;
dest->engine = src->engine;
#endif
dest->meth = src->meth;
}
if (src->meth != NULL && src->meth->copy != NULL &&
src->meth->copy(dest, src) == 0)
return 0;
return dest;
}
EC_KEY *
EC_KEY_dup(const EC_KEY * ec_key)
{
EC_KEY *ret;
if ((ret = EC_KEY_new_method(ec_key->engine)) == NULL)
return NULL;
if (EC_KEY_copy(ret, ec_key) == NULL) {
EC_KEY_free(ret);
return NULL;
}
return ret;
}
int
EC_KEY_up_ref(EC_KEY * r)
{
int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
return ((i > 1) ? 1 : 0);
}
int
EC_KEY_set_ex_data(EC_KEY *r, int idx, void *arg)
{
return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
}
void *
EC_KEY_get_ex_data(const EC_KEY *r, int idx)
{
return CRYPTO_get_ex_data(&r->ex_data, idx);
}
int
EC_KEY_generate_key(EC_KEY *eckey)
{
if (eckey->meth->keygen != NULL)
return eckey->meth->keygen(eckey);
ECerror(EC_R_NOT_IMPLEMENTED);
return 0;
}
int
ossl_ec_key_gen(EC_KEY *eckey)
{
int ok = 0;
BN_CTX *ctx = NULL;
BIGNUM *priv_key = NULL, *order = NULL;
EC_POINT *pub_key = NULL;
if (!eckey || !eckey->group) {
ECerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if ((order = BN_new()) == NULL)
goto err;
if ((ctx = BN_CTX_new()) == NULL)
goto err;
if ((priv_key = eckey->priv_key) == NULL) {
if ((priv_key = BN_new()) == NULL)
goto err;
}
if (!EC_GROUP_get_order(eckey->group, order, ctx))
goto err;
if (!bn_rand_interval(priv_key, BN_value_one(), order))
goto err;
if ((pub_key = eckey->pub_key) == NULL) {
if ((pub_key = EC_POINT_new(eckey->group)) == NULL)
goto err;
}
if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
goto err;
eckey->priv_key = priv_key;
eckey->pub_key = pub_key;
ok = 1;
err:
BN_free(order);
if (eckey->pub_key == NULL)
EC_POINT_free(pub_key);
if (eckey->priv_key == NULL)
BN_free(priv_key);
BN_CTX_free(ctx);
return (ok);
}
int
EC_KEY_check_key(const EC_KEY * eckey)
{
int ok = 0;
BN_CTX *ctx = NULL;
const BIGNUM *order = NULL;
EC_POINT *point = NULL;
if (!eckey || !eckey->group || !eckey->pub_key) {
ECerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key) > 0) {
ECerror(EC_R_POINT_AT_INFINITY);
goto err;
}
if ((ctx = BN_CTX_new()) == NULL)
goto err;
if ((point = EC_POINT_new(eckey->group)) == NULL)
goto err;
/* testing whether the pub_key is on the elliptic curve */
if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
goto err;
}
/* testing whether pub_key * order is the point at infinity */
order = &eckey->group->order;
if (BN_is_zero(order)) {
ECerror(EC_R_INVALID_GROUP_ORDER);
goto err;
}
if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
ECerror(ERR_R_EC_LIB);
goto err;
}
if (EC_POINT_is_at_infinity(eckey->group, point) <= 0) {
ECerror(EC_R_WRONG_ORDER);
goto err;
}
/*
* in case the priv_key is present : check if generator * priv_key ==
* pub_key
*/
if (eckey->priv_key) {
if (BN_cmp(eckey->priv_key, order) >= 0) {
ECerror(EC_R_WRONG_ORDER);
goto err;
}
if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
NULL, NULL, ctx)) {
ECerror(ERR_R_EC_LIB);
goto err;
}
if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
ctx) != 0) {
ECerror(EC_R_INVALID_PRIVATE_KEY);
goto err;
}
}
ok = 1;
err:
BN_CTX_free(ctx);
EC_POINT_free(point);
return (ok);
}
int
EC_KEY_set_public_key_affine_coordinates(EC_KEY * key, BIGNUM * x, BIGNUM * y)
{
BN_CTX *ctx = NULL;
BIGNUM *tx, *ty;
EC_POINT *point = NULL;
int ok = 0;
if (!key || !key->group || !x || !y) {
ECerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ctx = BN_CTX_new();
if (!ctx)
goto err;
point = EC_POINT_new(key->group);
if (!point)
goto err;
if ((tx = BN_CTX_get(ctx)) == NULL)
goto err;
if ((ty = BN_CTX_get(ctx)) == NULL)
goto err;
if (!EC_POINT_set_affine_coordinates(key->group, point, x, y, ctx))
goto err;
if (!EC_POINT_get_affine_coordinates(key->group, point, tx, ty, ctx))
goto err;
/*
* Check if retrieved coordinates match originals: if not values are
* out of range.
*/
if (BN_cmp(x, tx) || BN_cmp(y, ty)) {
ECerror(EC_R_COORDINATES_OUT_OF_RANGE);
goto err;
}
if (!EC_KEY_set_public_key(key, point))
goto err;
if (EC_KEY_check_key(key) == 0)
goto err;
ok = 1;
err:
BN_CTX_free(ctx);
EC_POINT_free(point);
return ok;
}
const EC_GROUP *
EC_KEY_get0_group(const EC_KEY * key)
{
return key->group;
}
int
EC_KEY_set_group(EC_KEY * key, const EC_GROUP * group)
{
if (key->meth->set_group != NULL &&
key->meth->set_group(key, group) == 0)
return 0;
EC_GROUP_free(key->group);
key->group = EC_GROUP_dup(group);
return (key->group == NULL) ? 0 : 1;
}
const BIGNUM *
EC_KEY_get0_private_key(const EC_KEY * key)
{
return key->priv_key;
}
int
EC_KEY_set_private_key(EC_KEY * key, const BIGNUM * priv_key)
{
if (key->meth->set_private != NULL &&
key->meth->set_private(key, priv_key) == 0)
return 0;
BN_clear_free(key->priv_key);
key->priv_key = BN_dup(priv_key);
return (key->priv_key == NULL) ? 0 : 1;
}
const EC_POINT *
EC_KEY_get0_public_key(const EC_KEY * key)
{
return key->pub_key;
}
int
EC_KEY_set_public_key(EC_KEY * key, const EC_POINT * pub_key)
{
if (key->meth->set_public != NULL &&
key->meth->set_public(key, pub_key) == 0)
return 0;
EC_POINT_free(key->pub_key);
key->pub_key = EC_POINT_dup(pub_key, key->group);
return (key->pub_key == NULL) ? 0 : 1;
}
unsigned int
EC_KEY_get_enc_flags(const EC_KEY * key)
{
return key->enc_flag;
}
void
EC_KEY_set_enc_flags(EC_KEY * key, unsigned int flags)
{
key->enc_flag = flags;
}
point_conversion_form_t
EC_KEY_get_conv_form(const EC_KEY * key)
{
return key->conv_form;
}
void
EC_KEY_set_conv_form(EC_KEY * key, point_conversion_form_t cform)
{
key->conv_form = cform;
if (key->group != NULL)
EC_GROUP_set_point_conversion_form(key->group, cform);
}
void *
EC_KEY_get_key_method_data(EC_KEY *key,
void *(*dup_func) (void *),
void (*free_func) (void *),
void (*clear_free_func) (void *))
{
void *ret;
CRYPTO_r_lock(CRYPTO_LOCK_EC);
ret = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
CRYPTO_r_unlock(CRYPTO_LOCK_EC);
return ret;
}
void *
EC_KEY_insert_key_method_data(EC_KEY * key, void *data,
void *(*dup_func) (void *),
void (*free_func) (void *),
void (*clear_free_func) (void *))
{
EC_EXTRA_DATA *ex_data;
CRYPTO_w_lock(CRYPTO_LOCK_EC);
ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
if (ex_data == NULL)
EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
CRYPTO_w_unlock(CRYPTO_LOCK_EC);
return ex_data;
}
void
EC_KEY_set_asn1_flag(EC_KEY * key, int flag)
{
if (key->group != NULL)
EC_GROUP_set_asn1_flag(key->group, flag);
}
int
EC_KEY_precompute_mult(EC_KEY * key, BN_CTX * ctx)
{
if (key->group == NULL)
return 0;
return EC_GROUP_precompute_mult(key->group, ctx);
}
int
EC_KEY_get_flags(const EC_KEY * key)
{
return key->flags;
}
void
EC_KEY_set_flags(EC_KEY * key, int flags)
{
key->flags |= flags;
}
void
EC_KEY_clear_flags(EC_KEY * key, int flags)
{
key->flags &= ~flags;
}