| /* Originally written by Bodo Moeller 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 of the attached software ("Contribution") are developed by |
| * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
| * |
| * The Contribution is licensed pursuant to the OpenSSL open source |
| * license provided above. |
| * |
| * The elliptic curve binary polynomial software is originally written by |
| * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems |
| * Laboratories. */ |
| |
| #include <openssl/ec_key.h> |
| |
| #include <openssl/ec.h> |
| #include <openssl/engine.h> |
| #include <openssl/err.h> |
| #include <openssl/ex_data.h> |
| #include <openssl/mem.h> |
| |
| #include "internal.h" |
| |
| |
| EC_KEY *EC_KEY_new(void) { return EC_KEY_new_method(NULL); } |
| |
| EC_KEY *EC_KEY_new_method(const ENGINE *engine) { |
| EC_KEY *ret = (EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY)); |
| if (ret == NULL) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_new_method, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| memset(ret, 0, sizeof(EC_KEY)); |
| |
| if (engine) { |
| ret->ecdsa_meth = ENGINE_get_ECDSA_method(engine); |
| } |
| if (ret->ecdsa_meth) { |
| METHOD_ref(ret->ecdsa_meth); |
| } |
| |
| ret->version = 1; |
| ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; |
| ret->references = 1; |
| |
| if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) { |
| goto err1; |
| } |
| |
| if (ret->ecdsa_meth && ret->ecdsa_meth->init && !ret->ecdsa_meth->init(ret)) { |
| goto err2; |
| } |
| |
| return ret; |
| |
| err2: |
| CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data); |
| err1: |
| if (ret->ecdsa_meth) { |
| METHOD_unref(ret->ecdsa_meth); |
| } |
| OPENSSL_free(ret); |
| return 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; |
| } |
| return ret; |
| } |
| |
| void EC_KEY_free(EC_KEY *r) { |
| if (r == NULL) { |
| return; |
| } |
| |
| if (CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC)) { |
| return; |
| } |
| |
| if (r->ecdsa_meth) { |
| if (r->ecdsa_meth->finish) { |
| r->ecdsa_meth->finish(r); |
| } |
| METHOD_unref(r->ecdsa_meth); |
| } |
| |
| if (r->group != NULL) { |
| EC_GROUP_free(r->group); |
| } |
| if (r->pub_key != NULL) { |
| EC_POINT_free(r->pub_key); |
| } |
| if (r->priv_key != NULL) { |
| BN_clear_free(r->priv_key); |
| } |
| |
| CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data); |
| |
| OPENSSL_cleanse((void *)r, sizeof(EC_KEY)); |
| OPENSSL_free(r); |
| } |
| |
| EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) { |
| if (dest == NULL || src == NULL) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_copy, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| /* copy the parameters */ |
| if (src->group) { |
| /* TODO(fork): duplicating the group seems wasteful. */ |
| const EC_METHOD *meth = src->group->meth; |
| /* clear the old group */ |
| if (dest->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) { |
| if (dest->pub_key) { |
| 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 */ |
| CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, dest, &dest->ex_data); |
| if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, &dest->ex_data, |
| &src->ex_data)) { |
| return NULL; |
| } |
| |
| /* copy the rest */ |
| dest->enc_flag = src->enc_flag; |
| dest->conv_form = src->conv_form; |
| dest->version = src->version; |
| dest->flags = src->flags; |
| |
| return dest; |
| } |
| |
| EC_KEY *EC_KEY_dup(const EC_KEY *ec_key) { |
| EC_KEY *ret = EC_KEY_new(); |
| if (ret == 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) { |
| return CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC) > 1; |
| } |
| |
| 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->group != NULL) { |
| EC_GROUP_free(key->group); |
| } |
| /* TODO(fork): duplicating the group seems wasteful but see |
| * |EC_KEY_set_conv_form|. */ |
| 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->priv_key) { |
| 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->pub_key != NULL) { |
| 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); |
| } |
| } |
| |
| 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_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) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, EC_R_POINT_AT_INFINITY); |
| goto err; |
| } |
| |
| ctx = BN_CTX_new(); |
| point = EC_POINT_new(eckey->group); |
| |
| if (ctx == NULL || |
| point == 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)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, EC_R_POINT_IS_NOT_ON_CURVE); |
| goto err; |
| } |
| /* testing whether pub_key * order is the point at infinity */ |
| /* TODO(fork): can this be skipped if the cofactor is one or if we're about |
| * to check the private key, below? */ |
| order = &eckey->group->order; |
| if (BN_is_zero(order)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, EC_R_INVALID_GROUP_ORDER); |
| goto err; |
| } |
| if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, ERR_R_EC_LIB); |
| goto err; |
| } |
| if (!EC_POINT_is_at_infinity(eckey->group, point)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, 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) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, EC_R_WRONG_ORDER); |
| goto err; |
| } |
| if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, NULL, NULL, ctx)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, ERR_R_EC_LIB); |
| goto err; |
| } |
| if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_check_key, EC_R_INVALID_PRIVATE_KEY); |
| goto err; |
| } |
| } |
| ok = 1; |
| |
| err: |
| if (ctx != NULL) |
| BN_CTX_free(ctx); |
| if (point != NULL) |
| 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) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_set_public_key_affine_coordinates, |
| ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| ctx = BN_CTX_new(); |
| point = EC_POINT_new(key->group); |
| |
| if (ctx == NULL || |
| point == NULL) { |
| goto err; |
| } |
| |
| tx = BN_CTX_get(ctx); |
| ty = BN_CTX_get(ctx); |
| |
| if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, x, y, ctx) || |
| !EC_POINT_get_affine_coordinates_GFp(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)) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_set_public_key_affine_coordinates, |
| 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: |
| if (ctx) |
| BN_CTX_free(ctx); |
| if (point) |
| EC_POINT_free(point); |
| return ok; |
| } |
| |
| int EC_KEY_generate_key(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) { |
| OPENSSL_PUT_ERROR(EC, EC_KEY_generate_key, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| order = BN_new(); |
| ctx = BN_CTX_new(); |
| |
| if (order == NULL || |
| ctx == NULL) { |
| goto err; |
| } |
| |
| if (eckey->priv_key == NULL) { |
| priv_key = BN_new(); |
| if (priv_key == NULL) { |
| goto err; |
| } |
| } else { |
| priv_key = eckey->priv_key; |
| } |
| |
| if (!EC_GROUP_get_order(eckey->group, order, ctx)) { |
| goto err; |
| } |
| |
| do { |
| if (!BN_rand_range(priv_key, order)) { |
| goto err; |
| } |
| } while (BN_is_zero(priv_key)); |
| |
| if (eckey->pub_key == NULL) { |
| pub_key = EC_POINT_new(eckey->group); |
| if (pub_key == NULL) { |
| goto err; |
| } |
| } else { |
| pub_key = eckey->pub_key; |
| } |
| |
| 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: |
| if (order) |
| BN_free(order); |
| if (pub_key != NULL && eckey->pub_key == NULL) |
| EC_POINT_free(pub_key); |
| if (priv_key != NULL && eckey->priv_key == NULL) |
| BN_free(priv_key); |
| if (ctx != NULL) |
| BN_CTX_free(ctx); |
| return ok; |
| } |
| |
| int EC_KEY_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
| CRYPTO_EX_dup *dup_func, |
| CRYPTO_EX_free *free_func) { |
| return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, argl, argp, new_func, |
| dup_func, free_func); |
| } |
| |
| int EC_KEY_set_ex_data(EC_KEY *d, int idx, void *arg) { |
| return CRYPTO_set_ex_data(&d->ex_data, idx, arg); |
| } |
| |
| void *EC_KEY_get_ex_data(const EC_KEY *d, int idx) { |
| return CRYPTO_get_ex_data(&d->ex_data, idx); |
| } |