use a generic EC_KEY structure (EC keys are not ECDSA specific)
Submitted by: Nils Larsch
diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
new file mode 100644
index 0000000..790d930
--- /dev/null
+++ b/crypto/ec/ec_key.c
@@ -0,0 +1,354 @@
+/* crypto/ec/ec_key.c */
+/*
+ * Written by Nils Larsch for the OpenSSL project.
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2002 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).
+ *
+ */
+
+#include "ec_lcl.h"
+#include <openssl/err.h>
+
+EC_KEY *EC_KEY_new(void)
+ {
+ EC_KEY *ret;
+
+ ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY));
+ if (ret == NULL)
+ {
+ ECerr(EC_F_EC_NEW, ERR_R_MALLOC_FAILURE);
+ return(NULL);
+ }
+
+ ret->version = 1;
+ ret->group = NULL;
+ ret->pub_key = NULL;
+ ret->priv_key= NULL;
+ ret->enc_flag= 0;
+ ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
+ ret->references= 1;
+ ret->meth_data = NULL;
+ return(ret);
+ }
+
+
+void EC_KEY_free(EC_KEY *r)
+ {
+ int i;
+
+ if (r == NULL) return;
+
+ i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC);
+#ifdef REF_PRINT
+ REF_PRINT("EC_KEY",r);
+#endif
+ if (i > 0) return;
+#ifdef REF_CHECK
+ if (i < 0)
+ {
+ fprintf(stderr,"EC_KEY_free, bad reference count\n");
+ abort();
+ }
+#endif
+
+ 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);
+
+ if (r->meth_data && r->meth_data->finish)
+ r->meth_data->finish(r);
+
+ memset((void *)r, 0x0, sizeof(EC_KEY));
+
+ OPENSSL_free(r);
+ }
+
+EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
+ {
+ if (dest == NULL || src == NULL)
+ {
+ ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
+ return NULL;
+ }
+ /* copy the parameters */
+ if (src->group)
+ {
+ const EC_METHOD *meth = EC_GROUP_method_of(src->group);
+ /* 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 the rest */
+ dest->enc_flag = src->enc_flag;
+ dest->conv_form = src->conv_form;
+ dest->version = src->version;
+
+ return dest;
+ }
+
+EC_KEY *EC_KEY_dup(const EC_KEY *eckey)
+ {
+ EC_KEY *ret = NULL;
+ int ok = 1;
+
+ ret = EC_KEY_new();
+ if (ret == NULL)
+ return NULL;
+ /* copy the parameters */
+ if (eckey->group)
+ {
+ ret->group = EC_GROUP_dup(eckey->group);
+ if (ret->group == NULL)
+ ok = 0;
+ }
+ /* copy the public key */
+ if (eckey->pub_key && eckey->group)
+ {
+ ret->pub_key = EC_POINT_dup(eckey->pub_key, eckey->group);
+ if (ret->pub_key == NULL)
+ ok = 0;
+ }
+ /* copy the private key */
+ if (eckey->priv_key)
+ {
+ ret->priv_key = BN_dup(ret->priv_key);
+ if (ret->priv_key == NULL)
+ ok = 0;
+ }
+ /* copy the rest */
+ ret->enc_flag = eckey->enc_flag;
+ ret->conv_form = eckey->conv_form;
+ ret->version = eckey->version;
+
+ if (!ok)
+ {
+ EC_KEY_free(ret);
+ ret = NULL;
+ }
+
+ return ret;
+ }
+
+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)
+ {
+ ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ if ((order = BN_new()) == NULL) goto err;
+ if ((ctx = BN_CTX_new()) == 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_check_key(const EC_KEY *eckey)
+ {
+ int ok = 0;
+ BN_CTX *ctx = NULL;
+ BIGNUM *order = NULL;
+ EC_POINT *point = NULL;
+
+ if (!eckey || !eckey->group || !eckey->pub_key)
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ if ((ctx = BN_CTX_new()) == NULL)
+ goto err;
+ if ((order = BN_new()) == NULL)
+ goto err;
+ if ((point = EC_POINT_new(eckey->group)) == NULL)
+ goto err;
+
+ /* testing whether the pub_key is on the elliptic curve */
+ if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
+ goto err;
+ }
+ /* testing whether pub_key * order is the point at infinity */
+ if (!EC_GROUP_get_order(eckey->group, order, ctx))
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+ if (!EC_POINT_copy(point, eckey->pub_key))
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (!EC_POINT_mul(eckey->group, point, order, NULL, NULL, ctx))
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (!EC_POINT_is_at_infinity(eckey->group, point))
+ {
+ ECerr(EC_F_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)
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
+ goto err;
+ }
+ if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
+ NULL, NULL, ctx))
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
+ ctx) != 0)
+ {
+ ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
+ goto err;
+ }
+ }
+ ok = 1;
+err:
+ if (ctx != NULL)
+ BN_CTX_free(ctx);
+ if (order != NULL)
+ BN_free(order);
+ if (point != NULL)
+ EC_POINT_free(point);
+ return(ok);
+ }
