Restructure implementation of EC_GROUP_check().
Submitted by: Nils Larsch
LIB=$(TOP)/libcrypto.a
LIBSRC= ec_lib.c ecp_smpl.c ecp_mont.c ecp_recp.c ecp_nist.c ec_cvt.c ec_mult.c \
- ec_err.c ec_curve.c
+ ec_err.c ec_curve.c ec_check.c
LIBOBJ= ec_lib.o ecp_smpl.o ecp_mont.o ecp_recp.o ecp_nist.o ec_cvt.o ec_mult.o \
- ec_err.o ec_curve.o
+ ec_err.o ec_curve.o ec_check.o
SRC= $(LIBSRC)
# DO NOT DELETE THIS LINE -- make depend depends on it.
+ec_check.o: ../../include/openssl/bio.h ../../include/openssl/bn.h
+ec_check.o: ../../include/openssl/crypto.h ../../include/openssl/e_os2.h
+ec_check.o: ../../include/openssl/ec.h ../../include/openssl/err.h
+ec_check.o: ../../include/openssl/lhash.h ../../include/openssl/opensslconf.h
+ec_check.o: ../../include/openssl/opensslv.h ../../include/openssl/safestack.h
+ec_check.o: ../../include/openssl/stack.h ../../include/openssl/symhacks.h
+ec_check.o: ec_check.c ec_lcl.h
ec_curve.o: ../../include/openssl/asn1.h ../../include/openssl/asn1t.h
ec_curve.o: ../../include/openssl/bio.h ../../include/openssl/bn.h
ec_curve.o: ../../include/openssl/crypto.h ../../include/openssl/e_os2.h
/* EC_GROUP_check() returns 1 if 'group' defines a valid group, 0 otherwise */
int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);
+/* EC_GROUP_check_discriminant() returns 1 if the discriminant of the
+ * elliptic curve is not zero, 0 otherwise */
+int EC_GROUP_check_discriminant(const EC_GROUP *, BN_CTX *);
/* EC_GROUP_new_GFp() calls EC_GROUP_new() and EC_GROUP_set_GFp()
* after choosing an appropriate EC_METHOD */
#define EC_F_EC_GFP_MONT_FIELD_ENCODE 134
#define EC_F_EC_GFP_MONT_FIELD_MUL 131
#define EC_F_EC_GFP_MONT_FIELD_SQR 132
-#define EC_F_EC_GFP_SIMPLE_GROUP_CHECK 151
+#define EC_F_EC_GFP_SIMPLE_GROUP_CHECK_DISCRIMINANT 152
#define EC_F_EC_GFP_SIMPLE_GROUP_SET_CURVE_GFP 100
#define EC_F_EC_GFP_SIMPLE_GROUP_SET_GENERATOR 101
#define EC_F_EC_GFP_SIMPLE_MAKE_AFFINE 102
#define EC_F_EC_GFP_SIMPLE_POINT_SET_AFFINE_COORDINATES_GFP 128
#define EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES_GFP 129
#define EC_F_EC_GROUP_CHECK 150
+#define EC_F_EC_GROUP_CHECK_DISCRIMINANT 153
#define EC_F_EC_GROUP_COPY 106
#define EC_F_EC_GROUP_GET0_GENERATOR 139
#define EC_F_EC_GROUP_GET_COFACTOR 140
--- /dev/null
+/* crypto/ec/ec_check.c */
+/* ====================================================================
+ * 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>
+
+int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
+ {
+ int ret = 0;
+ BIGNUM *order;
+ BN_CTX *new_ctx = NULL;
+ EC_POINT *point = NULL;
+
+ if (ctx == NULL)
+ {
+ ctx = new_ctx = BN_CTX_new();
+ if (ctx == NULL)
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ BN_CTX_start(ctx);
+ if ((order = BN_CTX_get(ctx)) == NULL) goto err;
+
+ /* check the discriminant */
+ if (!EC_GROUP_check_discriminant(group, ctx))
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
+ goto err;
+ }
+
+ /* check the generator */
+ if (group->generator == NULL)
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
+ goto err;
+ }
+ if (!EC_POINT_is_on_curve(group, group->generator, ctx))
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
+ goto err;
+ }
+
+ /* check the order of the generator */
+ if ((point = EC_POINT_new(group)) == NULL) goto err;
+ if (!EC_GROUP_get_order(group, order, ctx)) goto err;
+ if (BN_is_zero(order))
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
+ goto err;
+ }
+
+ if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx)) goto err;
+ if (!EC_POINT_is_at_infinity(group, point))
+ {
+ ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+
+ ret = 1;
+
+err:
+ BN_CTX_end(ctx);
+ if (new_ctx != NULL)
+ BN_CTX_free(new_ctx);
+ if (point)
+ EC_POINT_free(point);
+ return ret;
+ }
{ERR_PACK(0,EC_F_EC_GFP_MONT_FIELD_ENCODE,0), "ec_GFp_mont_field_encode"},
{ERR_PACK(0,EC_F_EC_GFP_MONT_FIELD_MUL,0), "ec_GFp_mont_field_mul"},
{ERR_PACK(0,EC_F_EC_GFP_MONT_FIELD_SQR,0), "ec_GFp_mont_field_sqr"},
-{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_GROUP_CHECK,0), "ec_GFp_simple_group_check"},
+{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_GROUP_CHECK_DISCRIMINANT,0), "ec_GFp_simple_group_check_discriminant"},
{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_GROUP_SET_CURVE_GFP,0), "ec_GFp_simple_group_set_curve_GFp"},
{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_GROUP_SET_GENERATOR,0), "ec_GFp_simple_group_set_generator"},
{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_MAKE_AFFINE,0), "ec_GFp_simple_make_affine"},
{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_POINT_SET_AFFINE_COORDINATES_GFP,0), "ec_GFp_simple_point_set_affine_coordinates_GFp"},
{ERR_PACK(0,EC_F_EC_GFP_SIMPLE_SET_COMPRESSED_COORDINATES_GFP,0), "ec_GFp_simple_set_compressed_coordinates_GFp"},
{ERR_PACK(0,EC_F_EC_GROUP_CHECK,0), "EC_GROUP_check"},
+{ERR_PACK(0,EC_F_EC_GROUP_CHECK_DISCRIMINANT,0), "EC_GROUP_check_discriminant"},
{ERR_PACK(0,EC_F_EC_GROUP_COPY,0), "EC_GROUP_copy"},
{ERR_PACK(0,EC_F_EC_GROUP_GET0_GENERATOR,0), "EC_GROUP_get0_generator"},
{ERR_PACK(0,EC_F_EC_GROUP_GET_COFACTOR,0), "EC_GROUP_get_cofactor"},
int (*group_get_cofactor)(const EC_GROUP *, BIGNUM *cofactor, BN_CTX *);
/* used by EC_GROUP_check: */
- int (*group_check)(const EC_GROUP *, BN_CTX *);
+ int (*group_check_discriminant)(const EC_GROUP *, BN_CTX *);
/* used by EC_POINT_new, EC_POINT_free, EC_POINT_clear_free, EC_POINT_copy: */
int (*point_init)(EC_POINT *);
EC_POINT *ec_GFp_simple_group_get0_generator(const EC_GROUP *);
int ec_GFp_simple_group_get_order(const EC_GROUP *, BIGNUM *order, BN_CTX *);
int ec_GFp_simple_group_get_cofactor(const EC_GROUP *, BIGNUM *cofactor, BN_CTX *);
-int ec_GFp_simple_group_check(const EC_GROUP *, BN_CTX *);
+int ec_GFp_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
int ec_GFp_simple_point_init(EC_POINT *);
void ec_GFp_simple_point_finish(EC_POINT *);
void ec_GFp_simple_point_clear_finish(EC_POINT *);
}
-int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx)
+int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
{
- if (group->meth->group_check == 0)
+ if (group->meth->group_check_discriminant == 0)
{
- ECerr(EC_F_EC_GROUP_CHECK, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
- return group->meth->group_check(group, ctx);
+ return group->meth->group_check_discriminant(group, ctx);
}
ec_GFp_simple_group_get0_generator,
ec_GFp_simple_group_get_order,
ec_GFp_simple_group_get_cofactor,
- ec_GFp_simple_group_check,
+ ec_GFp_simple_group_check_discriminant,
ec_GFp_simple_point_init,
ec_GFp_simple_point_finish,
ec_GFp_simple_point_clear_finish,
ec_GFp_simple_group_get0_generator,
ec_GFp_simple_group_get_order,
ec_GFp_simple_group_get_cofactor,
- ec_GFp_simple_group_check,
+ ec_GFp_simple_group_check_discriminant,
ec_GFp_simple_point_init,
ec_GFp_simple_point_finish,
ec_GFp_simple_point_clear_finish,
ec_GFp_simple_group_get0_generator,
ec_GFp_simple_group_get_order,
ec_GFp_simple_group_get_cofactor,
- ec_GFp_simple_group_check,
+ ec_GFp_simple_group_check_discriminant,
ec_GFp_simple_point_init,
ec_GFp_simple_point_finish,
ec_GFp_simple_point_clear_finish,
ec_GFp_simple_group_get0_generator,
ec_GFp_simple_group_get_order,
ec_GFp_simple_group_get_cofactor,
- ec_GFp_simple_group_check,
+ ec_GFp_simple_group_check_discriminant,
ec_GFp_simple_point_init,
ec_GFp_simple_point_finish,
ec_GFp_simple_point_clear_finish,
}
-int ec_GFp_simple_group_check(const EC_GROUP *group, BN_CTX *ctx)
+int ec_GFp_simple_group_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
{
int ret = 0;
BIGNUM *a,*b,*order,*tmp_1,*tmp_2;
const BIGNUM *p = &group->field;
BN_CTX *new_ctx = NULL;
- EC_POINT *point = NULL;
if (ctx == NULL)
{
ctx = new_ctx = BN_CTX_new();
if (ctx == NULL)
{
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
+ ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK_DISCRIMINANT, ERR_R_MALLOC_FAILURE);
goto err;
}
}
* 0 =< a, b < p */
if (BN_is_zero(a))
{
- if (BN_is_zero(b))
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
- goto err;
- }
+ if (BN_is_zero(b)) goto err;
}
else if (!BN_is_zero(b))
{
/* tmp_2 = 27*b^2 */
if (!BN_mod_add(a, tmp_1, tmp_2, p, ctx)) goto err;
- if (BN_is_zero(a))
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
- goto err;
- }
+ if (BN_is_zero(a)) goto err;
}
-
- /* check the generator */
- if (group->generator == NULL)
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
- goto err;
- }
- if (!ec_GFp_simple_is_on_curve(group, group->generator, ctx))
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
- goto err;
- }
-
- /* check the order of the generator */
- if ((point = EC_POINT_new(group)) == NULL) goto err;
- if (!EC_GROUP_get_order(group, order, ctx)) goto err;
- if (BN_is_zero(order))
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
- goto err;
- }
-
- if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx)) goto err;
- if (!EC_POINT_is_at_infinity(group, point))
- {
- ECerr(EC_F_EC_GFP_SIMPLE_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
- goto err;
- }
-
ret = 1;
err:
BN_CTX_end(ctx);
if (new_ctx != NULL)
BN_CTX_free(new_ctx);
- if (point)
- EC_POINT_free(point);
return ret;
}
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