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/* crypto/ec/ec_key.c */
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* Written by Nils Larsch for the OpenSSL project.
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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* 6. Redistributions of any form whatsoever must retain the following
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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* Portions originally developed by SUN MICROSYSTEMS, INC., and
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* contributed to the OpenSSL project.
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#include <openssl/err.h>
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EC_KEY *EC_KEY_new(void)
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ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY));
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ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE);
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ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
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ret->method_data = NULL;
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EC_KEY *EC_KEY_new_by_curve_name(int nid)
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EC_KEY *ret = EC_KEY_new();
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ret->group = EC_GROUP_new_by_curve_name(nid);
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if (ret->group == NULL)
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void EC_KEY_free(EC_KEY *r)
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if (r == NULL) return;
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i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC);
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REF_PRINT("EC_KEY",r);
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fprintf(stderr,"EC_KEY_free, bad reference count\n");
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if (r->group != NULL)
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EC_GROUP_free(r->group);
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if (r->pub_key != NULL)
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EC_POINT_free(r->pub_key);
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if (r->priv_key != NULL)
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BN_clear_free(r->priv_key);
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EC_EX_DATA_free_all_data(&r->method_data);
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OPENSSL_cleanse((void *)r, sizeof(EC_KEY));
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EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
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if (dest == NULL || src == NULL)
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ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
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/* copy the parameters */
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const EC_METHOD *meth = EC_GROUP_method_of(src->group);
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/* clear the old group */
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EC_GROUP_free(dest->group);
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dest->group = EC_GROUP_new(meth);
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if (dest->group == NULL)
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if (!EC_GROUP_copy(dest->group, src->group))
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/* copy the public key */
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if (src->pub_key && src->group)
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EC_POINT_free(dest->pub_key);
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dest->pub_key = EC_POINT_new(src->group);
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if (dest->pub_key == NULL)
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if (!EC_POINT_copy(dest->pub_key, src->pub_key))
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/* copy the private key */
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if (dest->priv_key == NULL)
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dest->priv_key = BN_new();
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if (dest->priv_key == NULL)
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if (!BN_copy(dest->priv_key, src->priv_key))
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/* copy method/extra data */
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EC_EX_DATA_free_all_data(&dest->method_data);
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for (d = src->method_data; d != NULL; d = d->next)
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void *t = d->dup_func(d->data);
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if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func))
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dest->enc_flag = src->enc_flag;
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dest->conv_form = src->conv_form;
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dest->version = src->version;
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EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
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EC_KEY *ret = EC_KEY_new();
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if (EC_KEY_copy(ret, ec_key) == NULL)
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int EC_KEY_up_ref(EC_KEY *r)
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int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
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REF_PRINT("EC_KEY",r);
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fprintf(stderr, "EC_KEY_up, bad reference count\n");
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return ((i > 1) ? 1 : 0);
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int EC_KEY_generate_key(EC_KEY *eckey)
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BIGNUM *priv_key = NULL, *order = NULL;
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EC_POINT *pub_key = NULL;
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if (!eckey || !eckey->group)
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ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
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if ((order = BN_new()) == NULL) goto err;
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if ((ctx = BN_CTX_new()) == NULL) goto err;
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if (eckey->priv_key == NULL)
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if (priv_key == NULL)
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priv_key = eckey->priv_key;
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if (!EC_GROUP_get_order(eckey->group, order, ctx))
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if (!BN_rand_range(priv_key, order))
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while (BN_is_zero(priv_key));
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if (eckey->pub_key == NULL)
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pub_key = EC_POINT_new(eckey->group);
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pub_key = eckey->pub_key;
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if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
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eckey->priv_key = priv_key;
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eckey->pub_key = pub_key;
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if (pub_key != NULL && eckey->pub_key == NULL)
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EC_POINT_free(pub_key);
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if (priv_key != NULL && eckey->priv_key == NULL)
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int EC_KEY_check_key(const EC_KEY *eckey)
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BIGNUM *order = NULL;
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EC_POINT *point = NULL;
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if (!eckey || !eckey->group || !eckey->pub_key)
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
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if ((ctx = BN_CTX_new()) == NULL)
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if ((order = BN_new()) == NULL)
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if ((point = EC_POINT_new(eckey->group)) == NULL)
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/* testing whether the pub_key is on the elliptic curve */
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if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
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ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
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/* testing whether pub_key * order is the point at infinity */
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if (!EC_GROUP_get_order(eckey->group, order, ctx))
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ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
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if (!EC_POINT_copy(point, eckey->pub_key))
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
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if (!EC_POINT_mul(eckey->group, point, order, NULL, NULL, ctx))
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
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if (!EC_POINT_is_at_infinity(eckey->group, point))
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ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
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/* in case the priv_key is present :
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* check if generator * priv_key == pub_key
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if (BN_cmp(eckey->priv_key, order) >= 0)
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ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
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if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
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ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
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if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
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ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
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EC_POINT_free(point);
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const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
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int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
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if (key->group != NULL)
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EC_GROUP_free(key->group);
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key->group = EC_GROUP_dup(group);
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return (key->group == NULL) ? 0 : 1;
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const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
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return key->priv_key;
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int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
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BN_clear_free(key->priv_key);
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key->priv_key = BN_dup(priv_key);
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return (key->priv_key == NULL) ? 0 : 1;
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const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
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int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
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if (key->pub_key != NULL)
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EC_POINT_free(key->pub_key);
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key->pub_key = EC_POINT_dup(pub_key, key->group);
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return (key->pub_key == NULL) ? 0 : 1;
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unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
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return key->enc_flag;
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void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
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key->enc_flag = flags;
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point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
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return key->conv_form;
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void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
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key->conv_form = cform;
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if (key->group != NULL)
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EC_GROUP_set_point_conversion_form(key->group, cform);
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void *EC_KEY_get_key_method_data(EC_KEY *key,
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void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
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return EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
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void EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
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void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
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EC_EXTRA_DATA *ex_data;
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CRYPTO_w_lock(CRYPTO_LOCK_EC);
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ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
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EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
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CRYPTO_w_unlock(CRYPTO_LOCK_EC);
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void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
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if (key->group != NULL)
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EC_GROUP_set_asn1_flag(key->group, flag);
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int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
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if (key->group == NULL)
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return EC_GROUP_precompute_mult(key->group, ctx);