-/* crypto/ec/ec_lib.c */
-/* ====================================================================
- * Copyright (c) 1998-2001 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 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
*
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#include <string.h>
+/*
+ * ECDSA low level APIs are deprecated for public use, but still ok for
+ * internal use.
+ */
+#include "internal/deprecated.h"
+#include <string.h>
+#include <openssl/params.h>
+#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/opensslv.h>
-
-#include "ec_lcl.h"
-
-static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
-
+#include "crypto/ec.h"
+#include "internal/nelem.h"
+#include "ec_local.h"
+#include "e_os.h" /* strcasecmp */
/* functions for EC_GROUP objects */
+EC_GROUP *ec_group_new_ex(OSSL_LIB_CTX *libctx, const char *propq,
+ const EC_METHOD *meth)
+{
+ EC_GROUP *ret;
+
+ if (meth == NULL) {
+ ECerr(0, EC_R_SLOT_FULL);
+ return NULL;
+ }
+ if (meth->group_init == 0) {
+ ECerr(0, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return NULL;
+ }
+
+ ret = OPENSSL_zalloc(sizeof(*ret));
+ if (ret == NULL) {
+ ECerr(0, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ ret->libctx = libctx;
+ if (propq != NULL) {
+ ret->propq = OPENSSL_strdup(propq);
+ if (ret->propq == NULL) {
+ ECerr(0, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ ret->meth = meth;
+ if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
+ ret->order = BN_new();
+ if (ret->order == NULL)
+ goto err;
+ ret->cofactor = BN_new();
+ if (ret->cofactor == NULL)
+ goto err;
+ }
+ ret->asn1_flag = OPENSSL_EC_NAMED_CURVE;
+ ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED;
+ if (!meth->group_init(ret))
+ goto err;
+ return ret;
+
+ err:
+ BN_free(ret->order);
+ BN_free(ret->cofactor);
+ OPENSSL_free(ret->propq);
+ OPENSSL_free(ret);
+ return NULL;
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+# ifndef FIPS_MODULE
EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
- {
- EC_GROUP *ret;
-
- if (meth == NULL)
- {
- ECerr(EC_F_EC_GROUP_NEW, ERR_R_PASSED_NULL_PARAMETER);
- return NULL;
- }
- if (meth->group_init == 0)
- {
- ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return NULL;
- }
-
- ret = OPENSSL_malloc(sizeof *ret);
- if (ret == NULL)
- {
- ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
-
- ret->meth = meth;
-
- ret->extra_data = NULL;
- ret->extra_data_dup_func = 0;
- ret->extra_data_free_func = 0;
- ret->extra_data_clear_free_func = 0;
-
- if (!meth->group_init(ret))
- {
- OPENSSL_free(ret);
- return NULL;
- }
-
- return ret;
- }
-
+{
+ return ec_group_new_ex(NULL, NULL, meth);
+}
+# endif
+#endif
+
+void EC_pre_comp_free(EC_GROUP *group)
+{
+ switch (group->pre_comp_type) {
+ case PCT_none:
+ break;
+ case PCT_nistz256:
+#ifdef ECP_NISTZ256_ASM
+ EC_nistz256_pre_comp_free(group->pre_comp.nistz256);
+#endif
+ break;
+#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
+ case PCT_nistp224:
+ EC_nistp224_pre_comp_free(group->pre_comp.nistp224);
+ break;
+ case PCT_nistp256:
+ EC_nistp256_pre_comp_free(group->pre_comp.nistp256);
+ break;
+ case PCT_nistp521:
+ EC_nistp521_pre_comp_free(group->pre_comp.nistp521);
+ break;
+#else
+ case PCT_nistp224:
+ case PCT_nistp256:
+ case PCT_nistp521:
+ break;
+#endif
+ case PCT_ec:
+ EC_ec_pre_comp_free(group->pre_comp.ec);
+ break;
+ }
+ group->pre_comp.ec = NULL;
+}
void EC_GROUP_free(EC_GROUP *group)
- {
- if (group->meth->group_finish != 0)
- group->meth->group_finish(group);
-
- EC_GROUP_free_extra_data(group);
-
- OPENSSL_free(group);
- }
-
-
+{
+ if (!group)
+ return;
+
+ if (group->meth->group_finish != 0)
+ group->meth->group_finish(group);
+
+ EC_pre_comp_free(group);
+ BN_MONT_CTX_free(group->mont_data);
+ EC_POINT_free(group->generator);
+ BN_free(group->order);
+ BN_free(group->cofactor);
+ OPENSSL_free(group->seed);
+ OPENSSL_free(group->propq);
+ OPENSSL_free(group);
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
void EC_GROUP_clear_free(EC_GROUP *group)
- {
- if (group->meth->group_clear_finish != 0)
- group->meth->group_clear_finish(group);
- else if (group->meth != NULL && group->meth->group_finish != 0)
- group->meth->group_finish(group);
-
- EC_GROUP_clear_free_extra_data(group);
-
- memset(group, 0, sizeof *group);
- OPENSSL_free(group);
- }
-
+{
+ if (!group)
+ return;
+
+ if (group->meth->group_clear_finish != 0)
+ group->meth->group_clear_finish(group);
+ else if (group->meth->group_finish != 0)
+ group->meth->group_finish(group);
+
+ EC_pre_comp_free(group);
+ BN_MONT_CTX_free(group->mont_data);
+ EC_POINT_clear_free(group->generator);
+ BN_clear_free(group->order);
+ BN_clear_free(group->cofactor);
+ OPENSSL_clear_free(group->seed, group->seed_len);
+ OPENSSL_clear_free(group, sizeof(*group));
+}
+#endif
int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
- {
- if (dest->meth->group_copy == 0)
- {
- ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (dest->meth != src->meth)
- {
- ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- if (dest == src)
- return 1;
-
- EC_GROUP_clear_free_extra_data(dest);
- if (src->extra_data_dup_func)
- {
- if (src->extra_data != NULL)
- {
- dest->extra_data = src->extra_data_dup_func(src->extra_data);
- if (dest->extra_data == NULL)
- return 0;
- }
-
- dest->extra_data_dup_func = src->extra_data_dup_func;
- dest->extra_data_free_func = src->extra_data_free_func;
- dest->extra_data_clear_free_func = src->extra_data_clear_free_func;
- }
-
- return dest->meth->group_copy(dest, src);
- }
-
-
-int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
- {
- if (group->meth->group_set_curve_GFp == 0)
- {
- ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- return group->meth->group_set_curve_GFp(group, p, a, b, ctx);
- }
-
-
-int EC_GROUP_get_curve_GFp(EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
- {
- if (group->meth->group_get_curve_GFp == 0)
- {
- ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- return group->meth->group_get_curve_GFp(group, p, a, b, ctx);
- }
-
-
-int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
- {
- if (group->meth->group_set_generator == 0)
- {
- ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- return group->meth->group_set_generator(group, generator, order, cofactor);
- }
-
-
-/* this has 'package' visibility */
-int EC_GROUP_set_extra_data(EC_GROUP *group, void *extra_data, void *(*extra_data_dup_func)(void *),
- void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
- {
- if ((group->extra_data != NULL)
- || (group->extra_data_dup_func != 0)
- || (group->extra_data_free_func != 0)
- || (group->extra_data_clear_free_func != 0))
- {
- ECerr(EC_F_EC_GROUP_SET_EXTRA_DATA, EC_R_SLOT_FULL);
- return 0;
- }
-
- group->extra_data = extra_data;
- group->extra_data_dup_func = extra_data_dup_func;
- group->extra_data_free_func = extra_data_free_func;
- group->extra_data_clear_free_func = extra_data_clear_free_func;
- return 1;
- }
-
-
-/* this has 'package' visibility */
-void *EC_GROUP_get_extra_data(EC_GROUP *group, void *(*extra_data_dup_func)(void *),
- void (*extra_data_free_func)(void *), void (*extra_data_clear_free_func)(void *))
- {
- if ((group->extra_data_dup_func != extra_data_dup_func)
- || (group->extra_data_free_func != extra_data_free_func)
- || (group->extra_data_clear_free_func != extra_data_clear_free_func))
- {
- ECerr(EC_F_EC_GROUP_GET_EXTRA_DATA, EC_R_NO_SUCH_EXTRA_DATA);
- return NULL;
- }
-
- return group->extra_data;
- }
-
-
-/* this has 'package' visibility */
-void EC_GROUP_free_extra_data(EC_GROUP *group)
- {
- if (group->extra_data_free_func)
- group->extra_data_free_func(group->extra_data);
- group->extra_data = NULL;
- group->extra_data_dup_func = 0;
- group->extra_data_free_func = 0;
- group->extra_data_clear_free_func = 0;
- }
-
-
-/* this has 'package' visibility */
-void EC_GROUP_clear_free_extra_data(EC_GROUP *group)
- {
- if (group->extra_data_clear_free_func)
- group->extra_data_clear_free_func(group->extra_data);
- else if (group->extra_data_free_func)
- group->extra_data_free_func(group->extra_data);
- group->extra_data = NULL;
- group->extra_data_dup_func = 0;
- group->extra_data_free_func = 0;
- group->extra_data_clear_free_func = 0;
- }
-
-
+{
+ if (dest->meth->group_copy == 0) {
+ ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (dest->meth != src->meth) {
+ ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ if (dest == src)
+ return 1;
+
+ dest->libctx = src->libctx;
+ dest->curve_name = src->curve_name;
+
+ /* Copy precomputed */
+ dest->pre_comp_type = src->pre_comp_type;
+ switch (src->pre_comp_type) {
+ case PCT_none:
+ dest->pre_comp.ec = NULL;
+ break;
+ case PCT_nistz256:
+#ifdef ECP_NISTZ256_ASM
+ dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256);
+#endif
+ break;
+#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
+ case PCT_nistp224:
+ dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224);
+ break;
+ case PCT_nistp256:
+ dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256);
+ break;
+ case PCT_nistp521:
+ dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521);
+ break;
+#else
+ case PCT_nistp224:
+ case PCT_nistp256:
+ case PCT_nistp521:
+ break;
+#endif
+ case PCT_ec:
+ dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec);
+ break;
+ }
+
+ if (src->mont_data != NULL) {
+ if (dest->mont_data == NULL) {
+ dest->mont_data = BN_MONT_CTX_new();
+ if (dest->mont_data == NULL)
+ return 0;
+ }
+ if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data))
+ return 0;
+ } else {
+ /* src->generator == NULL */
+ BN_MONT_CTX_free(dest->mont_data);
+ dest->mont_data = NULL;
+ }
+
+ if (src->generator != NULL) {
+ if (dest->generator == NULL) {
+ dest->generator = EC_POINT_new(dest);
+ if (dest->generator == NULL)
+ return 0;
+ }
+ if (!EC_POINT_copy(dest->generator, src->generator))
+ return 0;
+ } else {
+ /* src->generator == NULL */
+ EC_POINT_clear_free(dest->generator);
+ dest->generator = NULL;
+ }
+
+ if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) {
+ if (!BN_copy(dest->order, src->order))
+ return 0;
+ if (!BN_copy(dest->cofactor, src->cofactor))
+ return 0;
+ }
+
+ dest->asn1_flag = src->asn1_flag;
+ dest->asn1_form = src->asn1_form;
+ dest->decoded_from_explicit_params = src->decoded_from_explicit_params;
+
+ if (src->seed) {
+ OPENSSL_free(dest->seed);
+ if ((dest->seed = OPENSSL_malloc(src->seed_len)) == NULL) {
+ ECerr(EC_F_EC_GROUP_COPY, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ if (!memcpy(dest->seed, src->seed, src->seed_len))
+ return 0;
+ dest->seed_len = src->seed_len;
+ } else {
+ OPENSSL_free(dest->seed);
+ dest->seed = NULL;
+ dest->seed_len = 0;
+ }
+
+ return dest->meth->group_copy(dest, src);
+}
+
+EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
+{
+ EC_GROUP *t = NULL;
+ int ok = 0;
+
+ if (a == NULL)
+ return NULL;
+
+ if ((t = ec_group_new_ex(a->libctx, a->propq, a->meth)) == NULL)
+ return NULL;
+ if (!EC_GROUP_copy(t, a))
+ goto err;
+
+ ok = 1;
+
+ err:
+ if (!ok) {
+ EC_GROUP_free(t);
+ return NULL;
+ }
+ return t;
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
+{
+ return group->meth;
+}
+
+int EC_METHOD_get_field_type(const EC_METHOD *meth)
+{
+ return meth->field_type;
+}
+#endif
+
+static int ec_precompute_mont_data(EC_GROUP *);
+
+/*-
+ * Try computing cofactor from the generator order (n) and field cardinality (q).
+ * This works for all curves of cryptographic interest.
+ *
+ * Hasse thm: q + 1 - 2*sqrt(q) <= n*h <= q + 1 + 2*sqrt(q)
+ * h_min = (q + 1 - 2*sqrt(q))/n
+ * h_max = (q + 1 + 2*sqrt(q))/n
+ * h_max - h_min = 4*sqrt(q)/n
+ * So if n > 4*sqrt(q) holds, there is only one possible value for h:
+ * h = \lfloor (h_min + h_max)/2 \rceil = \lfloor (q + 1)/n \rceil
+ *
+ * Otherwise, zero cofactor and return success.
+ */
+static int ec_guess_cofactor(EC_GROUP *group) {
+ int ret = 0;
+ BN_CTX *ctx = NULL;
+ BIGNUM *q = NULL;
+
+ /*-
+ * If the cofactor is too large, we cannot guess it.
+ * The RHS of below is a strict overestimate of lg(4 * sqrt(q))
+ */
+ if (BN_num_bits(group->order) <= (BN_num_bits(group->field) + 1) / 2 + 3) {
+ /* default to 0 */
+ BN_zero(group->cofactor);
+ /* return success */
+ return 1;
+ }
+
+ if ((ctx = BN_CTX_new_ex(group->libctx)) == NULL)
+ return 0;
+
+ BN_CTX_start(ctx);
+ if ((q = BN_CTX_get(ctx)) == NULL)
+ goto err;
+
+ /* set q = 2**m for binary fields; q = p otherwise */
+ if (group->meth->field_type == NID_X9_62_characteristic_two_field) {
+ BN_zero(q);
+ if (!BN_set_bit(q, BN_num_bits(group->field) - 1))
+ goto err;
+ } else {
+ if (!BN_copy(q, group->field))
+ goto err;
+ }
+
+ /* compute h = \lfloor (q + 1)/n \rceil = \lfloor (q + 1 + n/2)/n \rfloor */
+ if (!BN_rshift1(group->cofactor, group->order) /* n/2 */
+ || !BN_add(group->cofactor, group->cofactor, q) /* q + n/2 */
+ /* q + 1 + n/2 */
+ || !BN_add(group->cofactor, group->cofactor, BN_value_one())
+ /* (q + 1 + n/2)/n */
+ || !BN_div(group->cofactor, NULL, group->cofactor, group->order, ctx))
+ goto err;
+ ret = 1;
+ err:
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ret;
+}
+
+int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
+ const BIGNUM *order, const BIGNUM *cofactor)
+{
+ if (generator == NULL) {
+ ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ /* require group->field >= 1 */
+ if (group->field == NULL || BN_is_zero(group->field)
+ || BN_is_negative(group->field)) {
+ ECerr(EC_F_EC_GROUP_SET_GENERATOR, EC_R_INVALID_FIELD);
+ return 0;
+ }
+
+ /*-
+ * - require order >= 1
+ * - enforce upper bound due to Hasse thm: order can be no more than one bit
+ * longer than field cardinality
+ */
+ if (order == NULL || BN_is_zero(order) || BN_is_negative(order)
+ || BN_num_bits(order) > BN_num_bits(group->field) + 1) {
+ ECerr(EC_F_EC_GROUP_SET_GENERATOR, EC_R_INVALID_GROUP_ORDER);
+ return 0;
+ }
+
+ /*-
+ * Unfortunately the cofactor is an optional field in many standards.
+ * Internally, the lib uses 0 cofactor as a marker for "unknown cofactor".
+ * So accept cofactor == NULL or cofactor >= 0.
+ */
+ if (cofactor != NULL && BN_is_negative(cofactor)) {
+ ECerr(EC_F_EC_GROUP_SET_GENERATOR, EC_R_UNKNOWN_COFACTOR);
+ return 0;
+ }
+
+ if (group->generator == NULL) {
+ group->generator = EC_POINT_new(group);
+ if (group->generator == NULL)
+ return 0;
+ }
+ if (!EC_POINT_copy(group->generator, generator))
+ return 0;
+
+ if (!BN_copy(group->order, order))
+ return 0;
+
+ /* Either take the provided positive cofactor, or try to compute it */
+ if (cofactor != NULL && !BN_is_zero(cofactor)) {
+ if (!BN_copy(group->cofactor, cofactor))
+ return 0;
+ } else if (!ec_guess_cofactor(group)) {
+ BN_zero(group->cofactor);
+ return 0;
+ }
+
+ /*
+ * Some groups have an order with
+ * factors of two, which makes the Montgomery setup fail.
+ * |group->mont_data| will be NULL in this case.
+ */
+ if (BN_is_odd(group->order)) {
+ return ec_precompute_mont_data(group);
+ }
+
+ BN_MONT_CTX_free(group->mont_data);
+ group->mont_data = NULL;
+ return 1;
+}
+
+const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
+{
+ return group->generator;
+}
+
+BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group)
+{
+ return group->mont_data;
+}
+
+int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
+{
+ if (group->order == NULL)
+ return 0;
+ if (!BN_copy(order, group->order))
+ return 0;
+
+ return !BN_is_zero(order);
+}
+
+const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group)
+{
+ return group->order;
+}
+
+int EC_GROUP_order_bits(const EC_GROUP *group)
+{
+ return group->meth->group_order_bits(group);
+}
+
+int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
+ BN_CTX *ctx)
+{
+
+ if (group->cofactor == NULL)
+ return 0;
+ if (!BN_copy(cofactor, group->cofactor))
+ return 0;
+
+ return !BN_is_zero(group->cofactor);
+}
+
+const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group)
+{
+ return group->cofactor;
+}
+
+void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
+{
+ group->curve_name = nid;
+}
+
+int EC_GROUP_get_curve_name(const EC_GROUP *group)
+{
+ return group->curve_name;
+}
+
+const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group)
+{
+ return group->field;
+}
+
+int EC_GROUP_get_field_type(const EC_GROUP *group)
+{
+ return group->meth->field_type;
+}
+
+void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
+{
+ group->asn1_flag = flag;
+}
+
+int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
+{
+ return group->asn1_flag;
+}
+
+void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
+ point_conversion_form_t form)
+{
+ group->asn1_form = form;
+}
+
+point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP
+ *group)
+{
+ return group->asn1_form;
+}
+
+size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
+{
+ OPENSSL_free(group->seed);
+ group->seed = NULL;
+ group->seed_len = 0;
+
+ if (!len || !p)
+ return 1;
+
+ if ((group->seed = OPENSSL_malloc(len)) == NULL) {
+ ECerr(EC_F_EC_GROUP_SET_SEED, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ memcpy(group->seed, p, len);
+ group->seed_len = len;
+
+ return len;
+}
+
+unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
+{
+ return group->seed;
+}
+
+size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
+{
+ return group->seed_len;
+}
+
+int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
+ const BIGNUM *b, BN_CTX *ctx)
+{
+ if (group->meth->group_set_curve == 0) {
+ ECerr(EC_F_EC_GROUP_SET_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ return group->meth->group_set_curve(group, p, a, b, ctx);
+}
+
+int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
+ BN_CTX *ctx)
+{
+ if (group->meth->group_get_curve == NULL) {
+ ECerr(EC_F_EC_GROUP_GET_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ return group->meth->group_get_curve(group, p, a, b, ctx);
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
+ const BIGNUM *b, BN_CTX *ctx)
+{
+ return EC_GROUP_set_curve(group, p, a, b, ctx);
+}
+
+int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
+ BIGNUM *b, BN_CTX *ctx)
+{
+ return EC_GROUP_get_curve(group, p, a, b, ctx);
+}
+
+# ifndef OPENSSL_NO_EC2M
+int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
+ const BIGNUM *b, BN_CTX *ctx)
+{
+ return EC_GROUP_set_curve(group, p, a, b, ctx);
+}
+
+int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
+ BIGNUM *b, BN_CTX *ctx)
+{
+ return EC_GROUP_get_curve(group, p, a, b, ctx);
+}
+# endif
+#endif
+
+int EC_GROUP_get_degree(const EC_GROUP *group)
+{
+ if (group->meth->group_get_degree == 0) {
+ ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ return group->meth->group_get_degree(group);
+}
+
+int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
+{
+ if (group->meth->group_check_discriminant == 0) {
+ ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ return group->meth->group_check_discriminant(group, ctx);
+}
+
+int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
+{
+ int r = 0;
+ BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
+#ifndef FIPS_MODULE
+ BN_CTX *ctx_new = NULL;
+#endif
+
+ /* compare the field types */
+ if (EC_GROUP_get_field_type(a) != EC_GROUP_get_field_type(b))
+ return 1;
+ /* compare the curve name (if present in both) */
+ if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
+ EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b))
+ return 1;
+ if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE)
+ return 0;
+
+#ifndef FIPS_MODULE
+ if (ctx == NULL)
+ ctx_new = ctx = BN_CTX_new();
+#endif
+ if (ctx == NULL)
+ return -1;
+
+ BN_CTX_start(ctx);
+ a1 = BN_CTX_get(ctx);
+ a2 = BN_CTX_get(ctx);
+ a3 = BN_CTX_get(ctx);
+ b1 = BN_CTX_get(ctx);
+ b2 = BN_CTX_get(ctx);
+ b3 = BN_CTX_get(ctx);
+ if (b3 == NULL) {
+ BN_CTX_end(ctx);
+#ifndef FIPS_MODULE
+ BN_CTX_free(ctx_new);
+#endif
+ return -1;
+ }
+
+ /*
+ * XXX This approach assumes that the external representation of curves
+ * over the same field type is the same.
+ */
+ if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
+ !b->meth->group_get_curve(b, b1, b2, b3, ctx))
+ r = 1;
+
+ /* return 1 if the curve parameters are different */
+ if (r || BN_cmp(a1, b1) != 0 || BN_cmp(a2, b2) != 0 || BN_cmp(a3, b3) != 0)
+ r = 1;
+
+ /* XXX EC_POINT_cmp() assumes that the methods are equal */
+ /* return 1 if the generators are different */
+ if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
+ EC_GROUP_get0_generator(b), ctx) != 0)
+ r = 1;
+
+ if (!r) {
+ const BIGNUM *ao, *bo, *ac, *bc;
+ /* compare the orders */
+ ao = EC_GROUP_get0_order(a);
+ bo = EC_GROUP_get0_order(b);
+ if (ao == NULL || bo == NULL) {
+ /* return an error if either order is NULL */
+ r = -1;
+ goto end;
+ }
+ if (BN_cmp(ao, bo) != 0) {
+ /* return 1 if orders are different */
+ r = 1;
+ goto end;
+ }
+ /*
+ * It gets here if the curve parameters and generator matched.
+ * Now check the optional cofactors (if both are present).
+ */
+ ac = EC_GROUP_get0_cofactor(a);
+ bc = EC_GROUP_get0_cofactor(b);
+ /* Returns 1 (mismatch) if both cofactors are specified and different */
+ if (!BN_is_zero(ac) && !BN_is_zero(bc) && BN_cmp(ac, bc) != 0)
+ r = 1;
+ /* Returns 0 if the parameters matched */
+ }
+end:
+ BN_CTX_end(ctx);
+#ifndef FIPS_MODULE
+ BN_CTX_free(ctx_new);
+#endif
+ return r;
+}
/* functions for EC_POINT objects */
EC_POINT *EC_POINT_new(const EC_GROUP *group)
- {
- EC_POINT *ret;
-
- if (group == NULL)
- {
- ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
- return NULL;
- }
- if (group->meth->point_init == 0)
- {
- ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return NULL;
- }
-
- ret = OPENSSL_malloc(sizeof *ret);
- if (ret == NULL)
- {
- ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
-
- ret->meth = group->meth;
-
- if (!ret->meth->point_init(ret))
- {
- OPENSSL_free(ret);
- return NULL;
- }
-
- return ret;
- }
-
+{
+ EC_POINT *ret;
+
+ if (group == NULL) {
+ ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
+ return NULL;
+ }
+ if (group->meth->point_init == NULL) {
+ ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return NULL;
+ }
+
+ ret = OPENSSL_zalloc(sizeof(*ret));
+ if (ret == NULL) {
+ ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ ret->meth = group->meth;
+ ret->curve_name = group->curve_name;
+
+ if (!ret->meth->point_init(ret)) {
+ OPENSSL_free(ret);
+ return NULL;
+ }
+
+ return ret;
+}
void EC_POINT_free(EC_POINT *point)
- {
- if (point->meth->point_finish != 0)
- point->meth->point_finish(point);
- OPENSSL_free(point);
- }
-
+{
+ if (point == NULL)
+ return;
+
+ if (point->meth->point_finish != 0)
+ point->meth->point_finish(point);
+ OPENSSL_free(point);
+}
void EC_POINT_clear_free(EC_POINT *point)
- {
- if (point->meth->point_clear_finish != 0)
- point->meth->point_clear_finish(point);
- else if (point->meth != NULL && point->meth->point_finish != 0)
- point->meth->point_finish(point);
- memset(point, 0, sizeof *point);
- OPENSSL_free(point);
- }
+{
+ if (point == NULL)
+ return;
+ if (point->meth->point_clear_finish != 0)
+ point->meth->point_clear_finish(point);
+ else if (point->meth->point_finish != 0)
+ point->meth->point_finish(point);
+ OPENSSL_clear_free(point, sizeof(*point));
+}
int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
- {
- if (dest->meth->point_copy == 0)
- {
- ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (dest->meth != src->meth)
- {
- ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- if (dest == src)
- return 1;
- return dest->meth->point_copy(dest, src);
- }
-
+{
+ if (dest->meth->point_copy == 0) {
+ ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (dest->meth != src->meth
+ || (dest->curve_name != src->curve_name
+ && dest->curve_name != 0
+ && src->curve_name != 0)) {
+ ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ if (dest == src)
+ return 1;
+ return dest->meth->point_copy(dest, src);
+}
+
+EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
+{
+ EC_POINT *t;
+ int r;
+
+ if (a == NULL)
+ return NULL;
+
+ t = EC_POINT_new(group);
+ if (t == NULL)
+ return NULL;
+ r = EC_POINT_copy(t, a);
+ if (!r) {
+ EC_POINT_free(t);
+ return NULL;
+ }
+ return t;
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
+{
+ return point->meth;
+}
+#endif
int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
- {
- if (group->meth->point_set_to_infinity == 0)
- {
- ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_set_to_infinity(group, point);
- }
-
-
-int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
- const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
- {
- if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
- {
- ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
- }
-
-
-int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
- BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
- {
- if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
- {
- ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
- }
-
-
-int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
- const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
- {
- if (group->meth->point_set_affine_coordinates_GFp == 0)
- {
- ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_set_affine_coordinates_GFp(group, point, x, y, ctx);
- }
-
-
-int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
- BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
- {
- if (group->meth->point_get_affine_coordinates_GFp == 0)
- {
- ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_get_affine_coordinates_GFp(group, point, x, y, ctx);
- }
-
-
-int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
- const BIGNUM *x, int y_bit, BN_CTX *ctx)
- {
- if (group->meth->point_set_compressed_coordinates_GFp == 0)
- {
- ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_set_compressed_coordinates_GFp(group, point, x, y_bit, ctx);
- }
-
-
-size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
- unsigned char *buf, size_t len, BN_CTX *ctx)
- {
- if (group->meth->point2oct == 0)
- {
- ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point2oct(group, point, form, buf, len, ctx);
- }
-
-
-int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
- const unsigned char *buf, size_t len, BN_CTX *ctx)
- {
- if (group->meth->oct2point == 0)
- {
- ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->oct2point(group, point, buf, len, ctx);
- }
-
-
-int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
- {
- if (group->meth->add == 0)
- {
- ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
- {
- ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->add(group, r, a, b, ctx);
- }
-
-
-int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
- {
- if (group->meth->dbl == 0)
- {
- ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if ((group->meth != r->meth) || (r->meth != a->meth))
- {
- ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->dbl(group, r, a, ctx);
- }
-
+{
+ if (group->meth->point_set_to_infinity == 0) {
+ ECerr(EC_F_EC_POINT_SET_TO_INFINITY,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (group->meth != point->meth) {
+ ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->point_set_to_infinity(group, point);
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
+ EC_POINT *point, const BIGNUM *x,
+ const BIGNUM *y, const BIGNUM *z,
+ BN_CTX *ctx)
+{
+ if (group->meth->field_type != NID_X9_62_prime_field) {
+ ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP,
+ EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return ec_GFp_simple_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
+}
+
+int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
+ const EC_POINT *point, BIGNUM *x,
+ BIGNUM *y, BIGNUM *z,
+ BN_CTX *ctx)
+{
+ if (group->meth->field_type != NID_X9_62_prime_field) {
+ ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP,
+ EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return ec_GFp_simple_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
+}
+#endif
+
+int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *point,
+ const BIGNUM *x, const BIGNUM *y,
+ BN_CTX *ctx)
+{
+ if (group->meth->point_set_affine_coordinates == NULL) {
+ ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx))
+ return 0;
+
+ if (EC_POINT_is_on_curve(group, point, ctx) <= 0) {
+ ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES, EC_R_POINT_IS_NOT_ON_CURVE);
+ return 0;
+ }
+ return 1;
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
+ EC_POINT *point, const BIGNUM *x,
+ const BIGNUM *y, BN_CTX *ctx)
+{
+ return EC_POINT_set_affine_coordinates(group, point, x, y, ctx);
+}
+
+# ifndef OPENSSL_NO_EC2M
+int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
+ EC_POINT *point, const BIGNUM *x,
+ const BIGNUM *y, BN_CTX *ctx)
+{
+ return EC_POINT_set_affine_coordinates(group, point, x, y, ctx);
+}
+# endif
+#endif
+
+int EC_POINT_get_affine_coordinates(const EC_GROUP *group,
+ const EC_POINT *point, BIGNUM *x, BIGNUM *y,
+ BN_CTX *ctx)
+{
+ if (group->meth->point_get_affine_coordinates == NULL) {
+ ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ if (EC_POINT_is_at_infinity(group, point)) {
+ ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES, EC_R_POINT_AT_INFINITY);
+ return 0;
+ }
+ return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
+ const EC_POINT *point, BIGNUM *x,
+ BIGNUM *y, BN_CTX *ctx)
+{
+ return EC_POINT_get_affine_coordinates(group, point, x, y, ctx);
+}
+
+# ifndef OPENSSL_NO_EC2M
+int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
+ const EC_POINT *point, BIGNUM *x,
+ BIGNUM *y, BN_CTX *ctx)
+{
+ return EC_POINT_get_affine_coordinates(group, point, x, y, ctx);
+}
+# endif
+#endif
+
+int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+ const EC_POINT *b, BN_CTX *ctx)
+{
+ if (group->meth->add == 0) {
+ ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)
+ || !ec_point_is_compat(b, group)) {
+ ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->add(group, r, a, b, ctx);
+}
+
+int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
+ BN_CTX *ctx)
+{
+ if (group->meth->dbl == 0) {
+ ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)) {
+ ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->dbl(group, r, a, ctx);
+}
int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
- {
- if (group->meth->dbl == 0)
- {
- ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != a->meth)
- {
- ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->invert(group, a, ctx);
- }
-
+{
+ if (group->meth->invert == 0) {
+ ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(a, group)) {
+ ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->invert(group, a, ctx);
+}
int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
- {
- if (group->meth->is_at_infinity == 0)
- {
- ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->is_at_infinity(group, point);
- }
-
-
-int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
- {
- if (group->meth->is_on_curve == 0)
- {
- ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->is_on_curve(group, point, ctx);
- }
-
-
-int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
- {
- if (group->meth->point_cmp == 0)
- {
- ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if ((group->meth != a->meth) || (a->meth != b->meth))
- {
- ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->point_cmp(group, a, b, ctx);
- }
-
-
+{
+ if (group->meth->is_at_infinity == 0) {
+ ECerr(EC_F_EC_POINT_IS_AT_INFINITY,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->is_at_infinity(group, point);
+}
+
+/*
+ * Check whether an EC_POINT is on the curve or not. Note that the return
+ * value for this function should NOT be treated as a boolean. Return values:
+ * 1: The point is on the curve
+ * 0: The point is not on the curve
+ * -1: An error occurred
+ */
+int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
+ BN_CTX *ctx)
+{
+ if (group->meth->is_on_curve == 0) {
+ ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->is_on_curve(group, point, ctx);
+}
+
+int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
+ BN_CTX *ctx)
+{
+ if (group->meth->point_cmp == 0) {
+ ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
+ if (!ec_point_is_compat(a, group) || !ec_point_is_compat(b, group)) {
+ ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
+ return -1;
+ }
+ return group->meth->point_cmp(group, a, b, ctx);
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
- {
- if (group->meth->make_affine == 0)
- {
- ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
- return 0;
- }
- if (group->meth != point->meth)
- {
- ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
- return 0;
- }
- return group->meth->make_affine(group, point, ctx);
- }
+{
+ if (group->meth->make_affine == 0) {
+ ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ if (!ec_point_is_compat(point, group)) {
+ ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ return group->meth->make_affine(group, point, ctx);
+}
+
+int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
+ EC_POINT *points[], BN_CTX *ctx)
+{
+ size_t i;
+
+ if (group->meth->points_make_affine == 0) {
+ ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+ for (i = 0; i < num; i++) {
+ if (!ec_point_is_compat(points[i], group)) {
+ ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ }
+ return group->meth->points_make_affine(group, num, points, ctx);
+}
+#endif
+
+/*
+ * Functions for point multiplication. If group->meth->mul is 0, we use the
+ * wNAF-based implementations in ec_mult.c; otherwise we dispatch through
+ * methods.
+ */
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
+ size_t num, const EC_POINT *points[],
+ const BIGNUM *scalars[], BN_CTX *ctx)
+{
+ int ret = 0;
+ size_t i = 0;
+#ifndef FIPS_MODULE
+ BN_CTX *new_ctx = NULL;
+#endif
+
+ if (!ec_point_is_compat(r, group)) {
+ ECerr(EC_F_EC_POINTS_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+
+ if (scalar == NULL && num == 0)
+ return EC_POINT_set_to_infinity(group, r);
+
+ for (i = 0; i < num; i++) {
+ if (!ec_point_is_compat(points[i], group)) {
+ ECerr(EC_F_EC_POINTS_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+ }
+
+#ifndef FIPS_MODULE
+ if (ctx == NULL)
+ ctx = new_ctx = BN_CTX_secure_new();
+#endif
+ if (ctx == NULL) {
+ ECerr(EC_F_EC_POINTS_MUL, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ if (group->meth->mul != NULL)
+ ret = group->meth->mul(group, r, scalar, num, points, scalars, ctx);
+ else
+ /* use default */
+ ret = ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
+
+#ifndef FIPS_MODULE
+ BN_CTX_free(new_ctx);
+#endif
+ return ret;
+}
+#endif
+
+int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
+ const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
+{
+ int ret = 0;
+ size_t num;
+#ifndef FIPS_MODULE
+ BN_CTX *new_ctx = NULL;
+#endif
+
+ if (!ec_point_is_compat(r, group)
+ || (point != NULL && !ec_point_is_compat(point, group))) {
+ ECerr(EC_F_EC_POINT_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+ return 0;
+ }
+
+ if (g_scalar == NULL && p_scalar == NULL)
+ return EC_POINT_set_to_infinity(group, r);
+
+#ifndef FIPS_MODULE
+ if (ctx == NULL)
+ ctx = new_ctx = BN_CTX_secure_new();
+#endif
+ if (ctx == NULL) {
+ ECerr(EC_F_EC_POINT_MUL, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ num = (point != NULL && p_scalar != NULL) ? 1 : 0;
+ if (group->meth->mul != NULL)
+ ret = group->meth->mul(group, r, g_scalar, num, &point, &p_scalar, ctx);
+ else
+ /* use default */
+ ret = ec_wNAF_mul(group, r, g_scalar, num, &point, &p_scalar, ctx);
+
+#ifndef FIPS_MODULE
+ BN_CTX_free(new_ctx);
+#endif
+ return ret;
+}
+
+#ifndef OPENSSL_NO_DEPRECATED_3_0
+int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
+{
+ if (group->meth->mul == 0)
+ /* use default */
+ return ec_wNAF_precompute_mult(group, ctx);
+
+ if (group->meth->precompute_mult != 0)
+ return group->meth->precompute_mult(group, ctx);
+ else
+ return 1; /* nothing to do, so report success */
+}
+
+int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
+{
+ if (group->meth->mul == 0)
+ /* use default */
+ return ec_wNAF_have_precompute_mult(group);
+
+ if (group->meth->have_precompute_mult != 0)
+ return group->meth->have_precompute_mult(group);
+ else
+ return 0; /* cannot tell whether precomputation has
+ * been performed */
+}
+#endif
+
+/*
+ * ec_precompute_mont_data sets |group->mont_data| from |group->order| and
+ * returns one on success. On error it returns zero.
+ */
+static int ec_precompute_mont_data(EC_GROUP *group)
+{
+ BN_CTX *ctx = BN_CTX_new_ex(group->libctx);
+ int ret = 0;
+
+ BN_MONT_CTX_free(group->mont_data);
+ group->mont_data = NULL;
+
+ if (ctx == NULL)
+ goto err;
+
+ group->mont_data = BN_MONT_CTX_new();
+ if (group->mont_data == NULL)
+ goto err;
+
+ if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) {
+ BN_MONT_CTX_free(group->mont_data);
+ group->mont_data = NULL;
+ goto err;
+ }
+
+ ret = 1;
+
+ err:
+
+ BN_CTX_free(ctx);
+ return ret;
+}
+
+#ifndef FIPS_MODULE
+int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg)
+{
+ return CRYPTO_set_ex_data(&key->ex_data, idx, arg);
+}
+
+void *EC_KEY_get_ex_data(const EC_KEY *key, int idx)
+{
+ return CRYPTO_get_ex_data(&key->ex_data, idx);
+}
+#endif
+
+int ec_group_simple_order_bits(const EC_GROUP *group)
+{
+ if (group->order == NULL)
+ return 0;
+ return BN_num_bits(group->order);
+}
+
+static int ec_field_inverse_mod_ord(const EC_GROUP *group, BIGNUM *r,
+ const BIGNUM *x, BN_CTX *ctx)
+{
+ BIGNUM *e = NULL;
+ int ret = 0;
+#ifndef FIPS_MODULE
+ BN_CTX *new_ctx = NULL;
+#endif
+
+ if (group->mont_data == NULL)
+ return 0;
+
+#ifndef FIPS_MODULE
+ if (ctx == NULL)
+ ctx = new_ctx = BN_CTX_secure_new();
+#endif
+ if (ctx == NULL)
+ return 0;
+
+ BN_CTX_start(ctx);
+ if ((e = BN_CTX_get(ctx)) == NULL)
+ goto err;
+
+ /*-
+ * We want inverse in constant time, therefore we utilize the fact
+ * order must be prime and use Fermats Little Theorem instead.
+ */
+ if (!BN_set_word(e, 2))
+ goto err;
+ if (!BN_sub(e, group->order, e))
+ goto err;
+ /*-
+ * Exponent e is public.
+ * No need for scatter-gather or BN_FLG_CONSTTIME.
+ */
+ if (!BN_mod_exp_mont(r, x, e, group->order, ctx, group->mont_data))
+ goto err;
+
+ ret = 1;
+
+ err:
+ BN_CTX_end(ctx);
+#ifndef FIPS_MODULE
+ BN_CTX_free(new_ctx);
+#endif
+ return ret;
+}
+
+/*-
+ * Default behavior, if group->meth->field_inverse_mod_ord is NULL:
+ * - When group->order is even, this function returns an error.
+ * - When group->order is otherwise composite, the correctness
+ * of the output is not guaranteed.
+ * - When x is outside the range [1, group->order), the correctness
+ * of the output is not guaranteed.
+ * - Otherwise, this function returns the multiplicative inverse in the
+ * range [1, group->order).
+ *
+ * EC_METHODs must implement their own field_inverse_mod_ord for
+ * other functionality.
+ */
+int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
+ const BIGNUM *x, BN_CTX *ctx)
+{
+ if (group->meth->field_inverse_mod_ord != NULL)
+ return group->meth->field_inverse_mod_ord(group, res, x, ctx);
+ else
+ return ec_field_inverse_mod_ord(group, res, x, ctx);
+}
+
+/*-
+ * Coordinate blinding for EC_POINT.
+ *
+ * The underlying EC_METHOD can optionally implement this function:
+ * underlying implementations should return 0 on errors, or 1 on
+ * success.
+ *
+ * This wrapper returns 1 in case the underlying EC_METHOD does not
+ * support coordinate blinding.
+ */
+int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx)
+{
+ if (group->meth->blind_coordinates == NULL)
+ return 1; /* ignore if not implemented */
+
+ return group->meth->blind_coordinates(group, p, ctx);
+}
+
+int EC_GROUP_get_basis_type(const EC_GROUP *group)
+{
+ int i;
+
+ if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field)
+ /* everything else is currently not supported */
+ return 0;
+
+ /* Find the last non-zero element of group->poly[] */
+ for (i = 0;
+ i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
+ i++)
+ continue;
+
+ if (i == 4)
+ return NID_X9_62_ppBasis;
+ else if (i == 2)
+ return NID_X9_62_tpBasis;
+ else
+ /* everything else is currently not supported */
+ return 0;
+}
+
+#ifndef OPENSSL_NO_EC2M
+int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
+{
+ if (group == NULL)
+ return 0;
+
+ if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field
+ || !((group->poly[0] != 0) && (group->poly[1] != 0)
+ && (group->poly[2] == 0))) {
+ ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+
+ if (k)
+ *k = group->poly[1];
+
+ return 1;
+}
+
+int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
+ unsigned int *k2, unsigned int *k3)
+{
+ if (group == NULL)
+ return 0;
+
+ if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field
+ || !((group->poly[0] != 0) && (group->poly[1] != 0)
+ && (group->poly[2] != 0) && (group->poly[3] != 0)
+ && (group->poly[4] == 0))) {
+ ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
+ ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return 0;
+ }
+
+ if (k1)
+ *k1 = group->poly[3];
+ if (k2)
+ *k2 = group->poly[2];
+ if (k3)
+ *k3 = group->poly[1];
+
+ return 1;
+}
+#endif
+
+/*
+ * Check if the explicit parameters group matches any built-in curves.
+ *
+ * We create a copy of the group just built, so that we can remove optional
+ * fields for the lookup: we do this to avoid the possibility that one of
+ * the optional parameters is used to force the library into using a less
+ * performant and less secure EC_METHOD instead of the specialized one.
+ * In any case, `seed` is not really used in any computation, while a
+ * cofactor different from the one in the built-in table is just
+ * mathematically wrong anyway and should not be used.
+ */
+static EC_GROUP *ec_group_explicit_to_named(const EC_GROUP *group,
+ OSSL_LIB_CTX *libctx,
+ const char *propq,
+ BN_CTX *ctx)
+{
+ EC_GROUP *ret_group = NULL, *dup = NULL;
+ int curve_name_nid;
+
+ const EC_POINT *point = EC_GROUP_get0_generator(group);
+ const BIGNUM *order = EC_GROUP_get0_order(group);
+ int no_seed = (EC_GROUP_get0_seed(group) == NULL);
+
+ if ((dup = EC_GROUP_dup(group)) == NULL
+ || EC_GROUP_set_seed(dup, NULL, 0) != 1
+ || !EC_GROUP_set_generator(dup, point, order, NULL))
+ goto err;
+ if ((curve_name_nid = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
+ /*
+ * The input explicit parameters successfully matched one of the
+ * built-in curves: often for built-in curves we have specialized
+ * methods with better performance and hardening.
+ *
+ * In this case we replace the `EC_GROUP` created through explicit
+ * parameters with one created from a named group.
+ */
+
+#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
+ /*
+ * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
+ * the same curve, we prefer the SECP nid when matching explicit
+ * parameters as that is associated with a specialized EC_METHOD.
+ */
+ if (curve_name_nid == NID_wap_wsg_idm_ecid_wtls12)
+ curve_name_nid = NID_secp224r1;
+#endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
+
+ ret_group = EC_GROUP_new_by_curve_name_ex(libctx, propq, curve_name_nid);
+ if (ret_group == NULL)
+ goto err;
+
+ /*
+ * Set the flag so that EC_GROUPs created from explicit parameters are
+ * serialized using explicit parameters by default.
+ */
+ EC_GROUP_set_asn1_flag(ret_group, OPENSSL_EC_EXPLICIT_CURVE);
+
+ /*
+ * If the input params do not contain the optional seed field we make
+ * sure it is not added to the returned group.
+ *
+ * The seed field is not really used inside libcrypto anyway, and
+ * adding it to parsed explicit parameter keys would alter their DER
+ * encoding output (because of the extra field) which could impact
+ * applications fingerprinting keys by their DER encoding.
+ */
+ if (no_seed) {
+ if (EC_GROUP_set_seed(ret_group, NULL, 0) != 1)
+ goto err;
+ }
+ } else {
+ ret_group = (EC_GROUP *)group;
+ }
+ EC_GROUP_free(dup);
+ return ret_group;
+err:
+ EC_GROUP_free(dup);
+ EC_GROUP_free(ret_group);
+ return NULL;
+}
+
+static int ec_encoding_param2id(const OSSL_PARAM *p, int *id)
+{
+ const char *name = NULL;
+ int status = 0;
+
+ switch (p->data_type) {
+ case OSSL_PARAM_UTF8_STRING:
+ /* The OSSL_PARAM functions have no support for this */
+ name = p->data;
+ status = (name != NULL);
+ break;
+ case OSSL_PARAM_UTF8_PTR:
+ status = OSSL_PARAM_get_utf8_ptr(p, &name);
+ break;
+ }
+ if (status) {
+ int i = ec_encoding_name2id(name);
+
+ if (i >= 0) {
+ *id = i;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static EC_GROUP *group_new_from_name(const OSSL_PARAM *p,
+ OSSL_LIB_CTX *libctx, const char *propq)
+{
+ int ok = 0, nid;
+ const char *curve_name = NULL;
+
+ switch (p->data_type) {
+ case OSSL_PARAM_UTF8_STRING:
+ /* The OSSL_PARAM functions have no support for this */
+ curve_name = p->data;
+ ok = (curve_name != NULL);
+ break;
+ case OSSL_PARAM_UTF8_PTR:
+ ok = OSSL_PARAM_get_utf8_ptr(p, &curve_name);
+ break;
+ }
+
+ if (ok) {
+ nid = ec_curve_name2nid(curve_name);
+ if (nid == NID_undef) {
+ ECerr(0, EC_R_INVALID_CURVE);
+ return NULL;
+ } else {
+ return EC_GROUP_new_by_curve_name_ex(libctx, propq, nid);
+ }
+ }
+ return NULL;
+}
+
+EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],
+ OSSL_LIB_CTX *libctx, const char *propq)
+{
+ const OSSL_PARAM *ptmp, *pa, *pb;
+ int ok = 0;
+ EC_GROUP *group = NULL, *named_group = NULL;
+ BIGNUM *p = NULL, *a = NULL, *b = NULL, *order = NULL, *cofactor = NULL;
+ EC_POINT *point = NULL;
+ int field_bits = 0;
+ int is_prime_field = 1;
+ BN_CTX *bnctx = NULL;
+ const unsigned char *buf = NULL;
+ int encoding_flag = -1;
+
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ENCODING);
+ if (ptmp != NULL && !ec_encoding_param2id(ptmp, &encoding_flag)) {
+ ECerr(0, EC_R_INVALID_ENCODING);
+ return 0;
+ }
+
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
+ if (ptmp != NULL) {
+ group = group_new_from_name(ptmp, libctx, propq);
+ if (group != NULL)
+ EC_GROUP_set_asn1_flag(group, encoding_flag);
+ return group;
+ }
+ bnctx = BN_CTX_new_ex(libctx);
+ if (bnctx == NULL) {
+ ECerr(0, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ BN_CTX_start(bnctx);
+
+ p = BN_CTX_get(bnctx);
+ a = BN_CTX_get(bnctx);
+ b = BN_CTX_get(bnctx);
+ order = BN_CTX_get(bnctx);
+ if (order == NULL) {
+ ECerr(0, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE);
+ if (ptmp == NULL || ptmp->data_type != OSSL_PARAM_UTF8_STRING) {
+ ECerr(0, EC_R_INVALID_FIELD);
+ goto err;
+ }
+ if (strcasecmp(ptmp->data, SN_X9_62_prime_field) == 0) {
+ is_prime_field = 1;
+ } else if (strcasecmp(ptmp->data, SN_X9_62_characteristic_two_field) == 0) {
+ is_prime_field = 0;
+ } else {
+ /* Invalid field */
+ ECerr(0, EC_R_UNSUPPORTED_FIELD);
+ goto err;
+ }
+
+ pa = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_A);
+ if (!OSSL_PARAM_get_BN(pa, &a)) {
+ ECerr(0, EC_R_INVALID_A);
+ goto err;
+ }
+ pb = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_B);
+ if (!OSSL_PARAM_get_BN(pb, &b)) {
+ ECerr(0, EC_R_INVALID_B);
+ goto err;
+ }
+
+ /* extract the prime number or irreducible polynomial */
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_P);
+ if (!OSSL_PARAM_get_BN(ptmp, &p)) {
+ ECerr(0, EC_R_INVALID_P);
+ goto err;
+ }
+
+ if (is_prime_field) {
+ if (BN_is_negative(p) || BN_is_zero(p)) {
+ ECerr(0, EC_R_INVALID_P);
+ goto err;
+ }
+ field_bits = BN_num_bits(p);
+ if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
+ ECerr(0, EC_R_FIELD_TOO_LARGE);
+ goto err;
+ }
+
+ /* create the EC_GROUP structure */
+ group = EC_GROUP_new_curve_GFp(p, a, b, bnctx);
+ } else {
+#ifdef OPENSSL_NO_EC2M
+ ECerr(0, EC_R_GF2M_NOT_SUPPORTED);
+ goto err;
+#else
+ /* create the EC_GROUP structure */
+ group = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
+ if (group != NULL) {
+ field_bits = EC_GROUP_get_degree(group);
+ if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
+ ECerr(0, EC_R_FIELD_TOO_LARGE);
+ goto err;
+ }
+ }
+#endif /* OPENSSL_NO_EC2M */
+ }
+
+ if (group == NULL) {
+ ECerr(0, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ /* Optional seed */
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED);
+ if (ptmp != NULL) {
+ if (ptmp->data_type != OSSL_PARAM_OCTET_STRING) {
+ ECerr(0, EC_R_INVALID_SEED);
+ goto err;
+ }
+ if (!EC_GROUP_set_seed(group, ptmp->data, ptmp->data_size))
+ goto err;
+ }
+
+ /* generator base point */
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GENERATOR);
+ if (ptmp == NULL
+ || ptmp->data_type != OSSL_PARAM_OCTET_STRING) {
+ ECerr(0, EC_R_INVALID_GENERATOR);
+ goto err;
+ }
+ buf = (const unsigned char *)(ptmp->data);
+ if ((point = EC_POINT_new(group)) == NULL)
+ goto err;
+ EC_GROUP_set_point_conversion_form(group,
+ (point_conversion_form_t)buf[0] & ~0x01);
+ if (!EC_POINT_oct2point(group, point, buf, ptmp->data_size, bnctx)) {
+ ECerr(0, EC_R_INVALID_GENERATOR);
+ goto err;
+ }
+
+ /* order */
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ORDER);
+ if (!OSSL_PARAM_get_BN(ptmp, &order)
+ || (BN_is_negative(order) || BN_is_zero(order))
+ || (BN_num_bits(order) > (int)field_bits + 1)) { /* Hasse bound */
+ ECerr(0, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+
+ /* Optional cofactor */
+ ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_COFACTOR);
+ if (ptmp != NULL) {
+ cofactor = BN_CTX_get(bnctx);
+ if (cofactor == NULL || !OSSL_PARAM_get_BN(ptmp, &cofactor)) {
+ ECerr(0, EC_R_INVALID_COFACTOR);
+ goto err;
+ }
+ }
+
+ /* set the generator, order and cofactor (if present) */
+ if (!EC_GROUP_set_generator(group, point, order, cofactor)) {
+ ECerr(0, EC_R_INVALID_GENERATOR);
+ goto err;
+ }
+
+ named_group = ec_group_explicit_to_named(group, libctx, propq, bnctx);
+ if (named_group == NULL) {
+ ECerr(0, EC_R_INVALID_NAMED_GROUP_CONVERSION);
+ goto err;
+ }
+ if (named_group == group) {
+ /*
+ * If we did not find a named group then the encoding should be explicit
+ * if it was specified
+ */
+ if (encoding_flag == OPENSSL_EC_NAMED_CURVE) {
+ ECerr(0, EC_R_INVALID_ENCODING);
+ goto err;
+ }
+ EC_GROUP_set_asn1_flag(group, OPENSSL_EC_EXPLICIT_CURVE);
+ } else {
+ EC_GROUP_free(group);
+ group = named_group;
+ }
+ ok = 1;
+ err:
+ if (!ok) {
+ EC_GROUP_free(group);
+ group = NULL;
+ }
+ EC_POINT_free(point);
+ BN_CTX_end(bnctx);
+ BN_CTX_free(bnctx);
+
+ return group;
+}