ec_err.c ec_curve.c ec_check.c ec_print.c ec_asn1.c ec_key.c\
ec2_smpl.c ec2_mult.c ec_ameth.c ec_pmeth.c eck_prn.c \
ecp_nistp224.c ecp_nistp256.c ecp_nistp521.c ecp_nistputil.c \
- ecp_oct.c ec2_oct.c ec_oct.c ec_kmeth.c ecdh_ossl.c ecdh_kdf.c
+ ecp_oct.c ec2_oct.c ec_oct.c ec_kmeth.c ecdh_ossl.c ecdh_kdf.c \
+ ecdsa_ossl.c
LIBOBJ= ec_lib.o ecp_smpl.o ecp_mont.o ecp_nist.o ec_cvt.o ec_mult.o\
ec_err.o ec_curve.o ec_check.o ec_print.o ec_asn1.o ec_key.o\
ec2_smpl.o ec2_mult.o ec_ameth.o ec_pmeth.o eck_prn.o \
ecp_nistp224.o ecp_nistp256.o ecp_nistp521.o ecp_nistputil.o \
ecp_oct.o ec2_oct.o ec_oct.o ec_kmeth.o ecdh_ossl.o ecdh_kdf.o \
- $(EC_ASM)
+ ecdsa_ossl.o $(EC_ASM)
SRC= $(LIBSRC)
--- /dev/null
+/* crypto/ecdsa/ecs_ossl.c */
+/*
+ * Written by Nils Larsch for the OpenSSL project
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2004 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 "ecs_locl.h"
+#include <openssl/err.h>
+#include <openssl/obj_mac.h>
+#include <openssl/bn.h>
+#include <openssl/rand.h>
+
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen,
+ const BIGNUM *, const BIGNUM *,
+ EC_KEY *eckey);
+static int ecdsa_sign_setup_no_digest(EC_KEY *eckey, BN_CTX *ctx_in,
+ BIGNUM **kinvp, BIGNUM **rp);
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
+ BIGNUM **rp, const unsigned char *dgst, int dlen);
+static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
+ const ECDSA_SIG *sig, EC_KEY *eckey);
+
+static ECDSA_METHOD openssl_ecdsa_meth = {
+ "OpenSSL ECDSA method",
+ ecdsa_do_sign,
+ ecdsa_sign_setup_no_digest,
+ ecdsa_do_verify,
+ ECDSA_FLAG_FIPS_METHOD, /* flags */
+ NULL /* app_data */
+};
+
+const ECDSA_METHOD *ECDSA_OpenSSL(void)
+{
+ return &openssl_ecdsa_meth;
+}
+
+static int ecdsa_sign_setup_no_digest(EC_KEY *eckey,
+ BN_CTX *ctx_in, BIGNUM **kinvp,
+ BIGNUM **rp)
+{
+ return ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
+}
+
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
+ BIGNUM **kinvp, BIGNUM **rp,
+ const unsigned char *dgst, int dlen)
+{
+ BN_CTX *ctx = NULL;
+ BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
+ EC_POINT *tmp_point = NULL;
+ const EC_GROUP *group;
+ int ret = 0;
+
+ if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ if (ctx_in == NULL) {
+ if ((ctx = BN_CTX_new()) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ } else
+ ctx = ctx_in;
+
+ k = BN_new(); /* this value is later returned in *kinvp */
+ r = BN_new(); /* this value is later returned in *rp */
+ order = BN_new();
+ X = BN_new();
+ if (k == NULL || r == NULL || order == NULL || X == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if ((tmp_point = EC_POINT_new(group)) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (!EC_GROUP_get_order(group, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ do {
+ /* get random k */
+ do
+ if (dgst != NULL) {
+ if (!BN_generate_dsa_nonce
+ (k, order, EC_KEY_get0_private_key(eckey), dgst, dlen,
+ ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
+ ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
+ goto err;
+ }
+ } else {
+ if (!BN_rand_range(k, order)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
+ ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
+ goto err;
+ }
+ }
+ while (BN_is_zero(k));
+
+ /*
+ * We do not want timing information to leak the length of k, so we
+ * compute G*k using an equivalent scalar of fixed bit-length.
+ */
+
+ if (!BN_add(k, k, order))
+ goto err;
+ if (BN_num_bits(k) <= BN_num_bits(order))
+ if (!BN_add(k, k, order))
+ goto err;
+
+ /* compute r the x-coordinate of generator * k */
+ if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
+ NID_X9_62_prime_field) {
+ if (!EC_POINT_get_affine_coordinates_GFp
+ (group, tmp_point, X, NULL, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+#ifndef OPENSSL_NO_EC2M
+ else { /* NID_X9_62_characteristic_two_field */
+
+ if (!EC_POINT_get_affine_coordinates_GF2m(group,
+ tmp_point, X, NULL,
+ ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+#endif
+ if (!BN_nnmod(r, X, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+ goto err;
+ }
+ }
+ while (BN_is_zero(r));
+
+ /* compute the inverse of k */
+ if (EC_GROUP_get_mont_data(group) != NULL) {
+ /*
+ * We want inverse in constant time, therefore we utilize the fact
+ * order must be prime and use Fermats Little Theorem instead.
+ */
+ if (!BN_set_word(X, 2)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+ goto err;
+ }
+ if (!BN_mod_sub(X, order, X, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+ goto err;
+ }
+ BN_set_flags(X, BN_FLG_CONSTTIME);
+ if (!BN_mod_exp_mont_consttime
+ (k, k, X, order, ctx, EC_GROUP_get_mont_data(group))) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+ goto err;
+ }
+ } else {
+ if (!BN_mod_inverse(k, k, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+ goto err;
+ }
+ }
+
+ /* clear old values if necessary */
+ BN_clear_free(*rp);
+ BN_clear_free(*kinvp);
+ /* save the pre-computed values */
+ *rp = r;
+ *kinvp = k;
+ ret = 1;
+ err:
+ if (!ret) {
+ BN_clear_free(k);
+ BN_clear_free(r);
+ }
+ if (ctx != ctx_in)
+ BN_CTX_free(ctx);
+ BN_free(order);
+ EC_POINT_free(tmp_point);
+ BN_clear_free(X);
+ return (ret);
+}
+
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
+ const BIGNUM *in_kinv, const BIGNUM *in_r,
+ EC_KEY *eckey)
+{
+ int ok = 0, i;
+ BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL, *order = NULL;
+ const BIGNUM *ckinv;
+ BN_CTX *ctx = NULL;
+ const EC_GROUP *group;
+ ECDSA_SIG *ret;
+ ECDSA_DATA *ecdsa;
+ const BIGNUM *priv_key;
+
+ ecdsa = ecdsa_check(eckey);
+ group = EC_KEY_get0_group(eckey);
+ priv_key = EC_KEY_get0_private_key(eckey);
+
+ if (group == NULL || priv_key == NULL || ecdsa == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER);
+ return NULL;
+ }
+
+ ret = ECDSA_SIG_new();
+ if (ret == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+ s = ret->s;
+
+ if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL ||
+ (tmp = BN_new()) == NULL || (m = BN_new()) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (!EC_GROUP_get_order(group, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
+ goto err;
+ }
+ i = BN_num_bits(order);
+ /*
+ * Need to truncate digest if it is too long: first truncate whole bytes.
+ */
+ if (8 * dgst_len > i)
+ dgst_len = (i + 7) / 8;
+ if (!BN_bin2bn(dgst, dgst_len, m)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* If still too long truncate remaining bits with a shift */
+ if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
+ do {
+ if (in_kinv == NULL || in_r == NULL) {
+ if (!ecdsa_sign_setup(eckey, ctx, &kinv, &ret->r, dgst, dgst_len)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_ECDSA_LIB);
+ goto err;
+ }
+ ckinv = kinv;
+ } else {
+ ckinv = in_kinv;
+ if (BN_copy(ret->r, in_r) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+
+ if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
+ if (!BN_mod_add_quick(s, tmp, m, order)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
+ if (!BN_mod_mul(s, s, ckinv, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
+ if (BN_is_zero(s)) {
+ /*
+ * if kinv and r have been supplied by the caller don't to
+ * generate new kinv and r values
+ */
+ if (in_kinv != NULL && in_r != NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
+ ECDSA_R_NEED_NEW_SETUP_VALUES);
+ goto err;
+ }
+ } else
+ /* s != 0 => we have a valid signature */
+ break;
+ }
+ while (1);
+
+ ok = 1;
+ err:
+ if (!ok) {
+ ECDSA_SIG_free(ret);
+ ret = NULL;
+ }
+ BN_CTX_free(ctx);
+ BN_clear_free(m);
+ BN_clear_free(tmp);
+ BN_free(order);
+ BN_clear_free(kinv);
+ return ret;
+}
+
+static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
+ const ECDSA_SIG *sig, EC_KEY *eckey)
+{
+ int ret = -1, i;
+ BN_CTX *ctx;
+ BIGNUM *order, *u1, *u2, *m, *X;
+ EC_POINT *point = NULL;
+ const EC_GROUP *group;
+ const EC_POINT *pub_key;
+
+ /* check input values */
+ if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
+ (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS);
+ return -1;
+ }
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ BN_CTX_start(ctx);
+ order = BN_CTX_get(ctx);
+ u1 = BN_CTX_get(ctx);
+ u2 = BN_CTX_get(ctx);
+ m = BN_CTX_get(ctx);
+ X = BN_CTX_get(ctx);
+ if (!X) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+
+ if (!EC_GROUP_get_order(group, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
+ BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
+ BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE);
+ ret = 0; /* signature is invalid */
+ goto err;
+ }
+ /* calculate tmp1 = inv(S) mod order */
+ if (!BN_mod_inverse(u2, sig->s, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* digest -> m */
+ i = BN_num_bits(order);
+ /*
+ * Need to truncate digest if it is too long: first truncate whole bytes.
+ */
+ if (8 * dgst_len > i)
+ dgst_len = (i + 7) / 8;
+ if (!BN_bin2bn(dgst, dgst_len, m)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* If still too long truncate remaining bits with a shift */
+ if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* u1 = m * tmp mod order */
+ if (!BN_mod_mul(u1, m, u2, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* u2 = r * w mod q */
+ if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+
+ if ((point = EC_POINT_new(group)) == NULL) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+ goto err;
+ }
+ if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
+ NID_X9_62_prime_field) {
+ if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+#ifndef OPENSSL_NO_EC2M
+ else { /* NID_X9_62_characteristic_two_field */
+
+ if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+#endif
+ if (!BN_nnmod(u1, X, order, ctx)) {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
+ /* if the signature is correct u1 is equal to sig->r */
+ ret = (BN_ucmp(u1, sig->r) == 0);
+ err:
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ EC_POINT_free(point);
+ return ret;
+}
GENERAL=Makefile
LIB=$(TOP)/libcrypto.a
-LIBSRC= ecs_lib.c ecs_ossl.c ecs_sign.c ecs_vrf.c ecs_err.c
+LIBSRC= ecs_lib.c ecs_sign.c ecs_vrf.c ecs_err.c
-LIBOBJ= ecs_lib.o ecs_ossl.o ecs_sign.o ecs_vrf.o ecs_err.o
+LIBOBJ= ecs_lib.o ecs_sign.o ecs_vrf.o ecs_err.o
SRC= $(LIBSRC)
+++ /dev/null
-/* crypto/ecdsa/ecs_ossl.c */
-/*
- * Written by Nils Larsch for the OpenSSL project
- */
-/* ====================================================================
- * Copyright (c) 1998-2004 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 "ecs_locl.h"
-#include <openssl/err.h>
-#include <openssl/obj_mac.h>
-#include <openssl/bn.h>
-#include <openssl/rand.h>
-
-static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen,
- const BIGNUM *, const BIGNUM *,
- EC_KEY *eckey);
-static int ecdsa_sign_setup_no_digest(EC_KEY *eckey, BN_CTX *ctx_in,
- BIGNUM **kinvp, BIGNUM **rp);
-static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
- BIGNUM **rp, const unsigned char *dgst, int dlen);
-static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
- const ECDSA_SIG *sig, EC_KEY *eckey);
-
-static ECDSA_METHOD openssl_ecdsa_meth = {
- "OpenSSL ECDSA method",
- ecdsa_do_sign,
- ecdsa_sign_setup_no_digest,
- ecdsa_do_verify,
- ECDSA_FLAG_FIPS_METHOD, /* flags */
- NULL /* app_data */
-};
-
-const ECDSA_METHOD *ECDSA_OpenSSL(void)
-{
- return &openssl_ecdsa_meth;
-}
-
-static int ecdsa_sign_setup_no_digest(EC_KEY *eckey,
- BN_CTX *ctx_in, BIGNUM **kinvp,
- BIGNUM **rp)
-{
- return ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
-}
-
-static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
- BIGNUM **kinvp, BIGNUM **rp,
- const unsigned char *dgst, int dlen)
-{
- BN_CTX *ctx = NULL;
- BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
- EC_POINT *tmp_point = NULL;
- const EC_GROUP *group;
- int ret = 0;
-
- if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- if (ctx_in == NULL) {
- if ((ctx = BN_CTX_new()) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- } else
- ctx = ctx_in;
-
- k = BN_new(); /* this value is later returned in *kinvp */
- r = BN_new(); /* this value is later returned in *rp */
- order = BN_new();
- X = BN_new();
- if (k == NULL || r == NULL || order == NULL || X == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- if ((tmp_point = EC_POINT_new(group)) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
- goto err;
- }
- if (!EC_GROUP_get_order(group, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
- goto err;
- }
-
- do {
- /* get random k */
- do
- if (dgst != NULL) {
- if (!BN_generate_dsa_nonce
- (k, order, EC_KEY_get0_private_key(eckey), dgst, dlen,
- ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
- ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
- goto err;
- }
- } else {
- if (!BN_rand_range(k, order)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
- ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
- goto err;
- }
- }
- while (BN_is_zero(k));
-
- /*
- * We do not want timing information to leak the length of k, so we
- * compute G*k using an equivalent scalar of fixed bit-length.
- */
-
- if (!BN_add(k, k, order))
- goto err;
- if (BN_num_bits(k) <= BN_num_bits(order))
- if (!BN_add(k, k, order))
- goto err;
-
- /* compute r the x-coordinate of generator * k */
- if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
- goto err;
- }
- if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
- NID_X9_62_prime_field) {
- if (!EC_POINT_get_affine_coordinates_GFp
- (group, tmp_point, X, NULL, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
- goto err;
- }
- }
-#ifndef OPENSSL_NO_EC2M
- else { /* NID_X9_62_characteristic_two_field */
-
- if (!EC_POINT_get_affine_coordinates_GF2m(group,
- tmp_point, X, NULL,
- ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
- goto err;
- }
- }
-#endif
- if (!BN_nnmod(r, X, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
- goto err;
- }
- }
- while (BN_is_zero(r));
-
- /* compute the inverse of k */
- if (EC_GROUP_get_mont_data(group) != NULL) {
- /*
- * We want inverse in constant time, therefore we utilize the fact
- * order must be prime and use Fermats Little Theorem instead.
- */
- if (!BN_set_word(X, 2)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
- goto err;
- }
- if (!BN_mod_sub(X, order, X, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
- goto err;
- }
- BN_set_flags(X, BN_FLG_CONSTTIME);
- if (!BN_mod_exp_mont_consttime
- (k, k, X, order, ctx, EC_GROUP_get_mont_data(group))) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
- goto err;
- }
- } else {
- if (!BN_mod_inverse(k, k, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
- goto err;
- }
- }
-
- /* clear old values if necessary */
- BN_clear_free(*rp);
- BN_clear_free(*kinvp);
- /* save the pre-computed values */
- *rp = r;
- *kinvp = k;
- ret = 1;
- err:
- if (!ret) {
- BN_clear_free(k);
- BN_clear_free(r);
- }
- if (ctx != ctx_in)
- BN_CTX_free(ctx);
- BN_free(order);
- EC_POINT_free(tmp_point);
- BN_clear_free(X);
- return (ret);
-}
-
-static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
- const BIGNUM *in_kinv, const BIGNUM *in_r,
- EC_KEY *eckey)
-{
- int ok = 0, i;
- BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL, *order = NULL;
- const BIGNUM *ckinv;
- BN_CTX *ctx = NULL;
- const EC_GROUP *group;
- ECDSA_SIG *ret;
- ECDSA_DATA *ecdsa;
- const BIGNUM *priv_key;
-
- ecdsa = ecdsa_check(eckey);
- group = EC_KEY_get0_group(eckey);
- priv_key = EC_KEY_get0_private_key(eckey);
-
- if (group == NULL || priv_key == NULL || ecdsa == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER);
- return NULL;
- }
-
- ret = ECDSA_SIG_new();
- if (ret == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
- s = ret->s;
-
- if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL ||
- (tmp = BN_new()) == NULL || (m = BN_new()) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- if (!EC_GROUP_get_order(group, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
- goto err;
- }
- i = BN_num_bits(order);
- /*
- * Need to truncate digest if it is too long: first truncate whole bytes.
- */
- if (8 * dgst_len > i)
- dgst_len = (i + 7) / 8;
- if (!BN_bin2bn(dgst, dgst_len, m)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
- goto err;
- }
- /* If still too long truncate remaining bits with a shift */
- if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
- goto err;
- }
- do {
- if (in_kinv == NULL || in_r == NULL) {
- if (!ecdsa_sign_setup(eckey, ctx, &kinv, &ret->r, dgst, dgst_len)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_ECDSA_LIB);
- goto err;
- }
- ckinv = kinv;
- } else {
- ckinv = in_kinv;
- if (BN_copy(ret->r, in_r) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- }
-
- if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
- goto err;
- }
- if (!BN_mod_add_quick(s, tmp, m, order)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
- goto err;
- }
- if (!BN_mod_mul(s, s, ckinv, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
- goto err;
- }
- if (BN_is_zero(s)) {
- /*
- * if kinv and r have been supplied by the caller don't to
- * generate new kinv and r values
- */
- if (in_kinv != NULL && in_r != NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
- ECDSA_R_NEED_NEW_SETUP_VALUES);
- goto err;
- }
- } else
- /* s != 0 => we have a valid signature */
- break;
- }
- while (1);
-
- ok = 1;
- err:
- if (!ok) {
- ECDSA_SIG_free(ret);
- ret = NULL;
- }
- BN_CTX_free(ctx);
- BN_clear_free(m);
- BN_clear_free(tmp);
- BN_free(order);
- BN_clear_free(kinv);
- return ret;
-}
-
-static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
- const ECDSA_SIG *sig, EC_KEY *eckey)
-{
- int ret = -1, i;
- BN_CTX *ctx;
- BIGNUM *order, *u1, *u2, *m, *X;
- EC_POINT *point = NULL;
- const EC_GROUP *group;
- const EC_POINT *pub_key;
-
- /* check input values */
- if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
- (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS);
- return -1;
- }
-
- ctx = BN_CTX_new();
- if (ctx == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
- return -1;
- }
- BN_CTX_start(ctx);
- order = BN_CTX_get(ctx);
- u1 = BN_CTX_get(ctx);
- u2 = BN_CTX_get(ctx);
- m = BN_CTX_get(ctx);
- X = BN_CTX_get(ctx);
- if (!X) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
-
- if (!EC_GROUP_get_order(group, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
- goto err;
- }
-
- if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
- BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
- BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE);
- ret = 0; /* signature is invalid */
- goto err;
- }
- /* calculate tmp1 = inv(S) mod order */
- if (!BN_mod_inverse(u2, sig->s, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
- /* digest -> m */
- i = BN_num_bits(order);
- /*
- * Need to truncate digest if it is too long: first truncate whole bytes.
- */
- if (8 * dgst_len > i)
- dgst_len = (i + 7) / 8;
- if (!BN_bin2bn(dgst, dgst_len, m)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
- /* If still too long truncate remaining bits with a shift */
- if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
- /* u1 = m * tmp mod order */
- if (!BN_mod_mul(u1, m, u2, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
- /* u2 = r * w mod q */
- if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
-
- if ((point = EC_POINT_new(group)) == NULL) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
- goto err;
- }
- if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
- NID_X9_62_prime_field) {
- if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
- goto err;
- }
- }
-#ifndef OPENSSL_NO_EC2M
- else { /* NID_X9_62_characteristic_two_field */
-
- if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
- goto err;
- }
- }
-#endif
- if (!BN_nnmod(u1, X, order, ctx)) {
- ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
- goto err;
- }
- /* if the signature is correct u1 is equal to sig->r */
- ret = (BN_ucmp(u1, sig->r) == 0);
- err:
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- EC_POINT_free(point);
- return ret;
-}
projects / oweals / openssl.git / commitdiff