use a generic EC_KEY structure (EC keys are not ECDSA specific)

Submitted by: Nils Larsch

1 files changed, 354 insertions, 0 deletions

diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
new file mode 100644
index 0000000000..790d930225
--- /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);
+	}