/* crypto/ecdsa/ecs_ossl.c */
+/*
+ * Written by Nils Larsch for the OpenSSL project
+ */
/* ====================================================================
- * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
+ * 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
* Hudson (tjh@cryptsoft.com).
*
*/
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-#include "cryptlib.h"
-#include <openssl/ecdsa.h>
-/* TODO : general case */
-#define EC_POINT_get_affine_coordinates EC_POINT_get_affine_coordinates_GFp
+#include "ecdsa.h"
+#include <openssl/err.h>
+#include <openssl/obj_mac.h>
+#include <openssl/bn.h>
-static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen, ECDSA *ecdsa);
-static int ecdsa_sign_setup(ECDSA *ecdsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
-static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len, ECDSA_SIG *sig,
- ECDSA *ecdsa);
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dlen,
+ EC_KEY *eckey);
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
+ BIGNUM **rp);
+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,
-ecdsa_do_verify,
-0,
-NULL
+ "OpenSSL ECDSA method",
+ ecdsa_do_sign,
+ ecdsa_sign_setup,
+ ecdsa_do_verify,
+#if 0
+ NULL, /* init */
+ NULL, /* finish */
+#endif
+ 0, /* flags */
+ NULL /* app_data */
};
const ECDSA_METHOD *ECDSA_OpenSSL(void)
return &openssl_ecdsa_meth;
}
-static int ecdsa_sign_setup(ECDSA *ecdsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
+ BIGNUM **rp)
{
BN_CTX *ctx = NULL;
- BIGNUM k,*kinv=NULL,*r=NULL,*order=NULL,*X=NULL;
+ BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
EC_POINT *tmp_point=NULL;
- int ret = 0,reason = ERR_R_BN_LIB;
- if (!ecdsa || !ecdsa->group || !ecdsa->pub_key || !ecdsa->priv_key)
+ EC_GROUP *group;
+ int ret = 0;
+ if (!eckey || !eckey->group || !eckey->pub_key || !eckey->priv_key)
{
- reason = ECDSA_R_MISSING_PARAMETERS;
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
+ group = eckey->group;
+
if (ctx_in == NULL)
{
- if ((ctx=BN_CTX_new()) == NULL) goto err;
+ if ((ctx = BN_CTX_new()) == NULL)
+ {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
}
else
- ctx=ctx_in;
+ ctx = ctx_in;
- if ((r = BN_new()) == NULL) goto err;
- if ((order = BN_new()) == NULL) goto err;
- if ((X = BN_new()) == NULL) goto err;
- if ((tmp_point = EC_POINT_new(ecdsa->group)) == NULL)
+ 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 || !r || !order || !X)
+ {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if ((tmp_point = EC_POINT_new(group)) == NULL)
{
- reason = ERR_R_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
goto err;
}
- if (!EC_GROUP_get_order(ecdsa->group,order,ctx))
+ if (!EC_GROUP_get_order(group, order, ctx))
{
- reason = ERR_R_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
goto err;
}
do
{
/* get random k */
- BN_init(&k);
do
- if (!BN_rand_range(&k,order))
+ if (!BN_rand_range(k, order))
{
- reason = ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED;
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
+ ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
goto err;
}
- while (BN_is_zero(&k));
+ while (BN_is_zero(k));
/* compute r the x-coordinate of generator * k */
- if (!EC_POINT_mul(ecdsa->group,tmp_point,&k,NULL,NULL,ctx)
- || !EC_POINT_get_affine_coordinates(ecdsa->group,tmp_point,X,NULL,ctx))
+ 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;
+ }
+ }
+ 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;
+ }
+ }
+ if (!BN_nnmod(r, X, order, ctx))
{
- reason = ERR_R_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
goto err;
}
- if (!BN_nnmod(r,X,order,ctx)) goto err;
}
while (BN_is_zero(r));
/* compute the inverse of k */
- if ((kinv = BN_mod_inverse(NULL,&k,order,ctx)) == NULL) goto err;
-
- if (*rp == NULL)
+ 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 */
+ if (*rp != NULL)
BN_clear_free(*rp);
- *rp = r;
- if (*kinvp == NULL)
+ if (*kinvp != NULL)
BN_clear_free(*kinvp);
- *kinvp = kinv;
- kinv = NULL;
+ /* save the pre-computed values */
+ *rp = r;
+ *kinvp = k;
ret = 1;
err:
if (!ret)
{
- ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,reason);
- if (kinv != NULL) BN_clear_free(kinv);
+ if (k != NULL) BN_clear_free(k);
if (r != NULL) BN_clear_free(r);
}
if (ctx_in == NULL)
BN_CTX_free(ctx);
- if (kinv != NULL)
- BN_clear_free(kinv);
if (order != NULL)
- BN_clear_free(order);
+ BN_free(order);
if (tmp_point != NULL)
EC_POINT_free(tmp_point);
- if (X) BN_clear_free(X);
- BN_clear_free(&k);
+ if (X)
+ BN_clear_free(X);
return(ret);
}
-static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len, ECDSA *ecdsa)
+static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
+ EC_KEY *eckey)
{
- BIGNUM *kinv=NULL,*r=NULL,*s=NULL,*m=NULL,*tmp=NULL,*order=NULL;
- BIGNUM xr;
- BN_CTX *ctx=NULL;
- int reason=ERR_R_BN_LIB;
- ECDSA_SIG *ret=NULL;
+ int ok = 0;
+ BIGNUM *kinv=NULL, *r, *s, *m=NULL,*tmp=NULL,*order=NULL;
+ BN_CTX *ctx = NULL;
+ EC_GROUP *group;
+ ECDSA_SIG *ret;
+ ECDSA_DATA *ecdsa;
- if (!ecdsa || !ecdsa->group || !ecdsa->pub_key || !ecdsa->priv_key)
+ ecdsa = ecdsa_check(eckey);
+
+ if (!eckey->group || !eckey->pub_key || !eckey->priv_key || !ecdsa)
{
- reason = ECDSA_R_MISSING_PARAMETERS;
- goto err;
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_PASSED_NULL_PARAMETER);
+ return NULL;
}
- BN_init(&xr);
- if ((ctx = BN_CTX_new()) == NULL) goto err;
- if ((order = BN_new()) == NULL) goto err;
- if ((tmp = BN_new()) == NULL) goto err;
- if ((m = BN_new()) == NULL) goto err;
- if ((s = BN_new()) == NULL) goto err;
+ group = eckey->group;
+ ret = ECDSA_SIG_new();
+ if (!ret)
+ {
+ 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(ecdsa->group,order,ctx))
+ if (!EC_GROUP_get_order(group, order, ctx))
{
- reason = ECDSA_R_ERR_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
goto err;
}
if (dgst_len > BN_num_bytes(order))
{
- reason = ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE;
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
+ ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
goto err;
}
- if (BN_bin2bn(dgst,dgst_len,m) == NULL) goto err;
+ if (!BN_bin2bn(dgst, dgst_len, m))
+ {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
do
{
- if ((ecdsa->kinv == NULL) || (ecdsa->r == NULL))
+ if (ecdsa->kinv == NULL || ecdsa->r == NULL)
{
- if (!ECDSA_sign_setup(ecdsa,ctx,&kinv,&r)) goto err;
+ if (!ECDSA_sign_setup(eckey, ctx, &kinv, &ret->r))
+ {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,ERR_R_ECDSA_LIB);
+ goto err;
+ }
+ r = ret->r;
}
else
{
- kinv = ecdsa->kinv;
+ BN_free(ret->r);
+ kinv = ecdsa->kinv;
+ r = ecdsa->r;
+ ret->r = r;
ecdsa->kinv = NULL;
- r = ecdsa->r;
- ecdsa->r = NULL;
+ ecdsa->r = NULL;
}
- if (!BN_mod_mul(tmp,ecdsa->priv_key,r,order,ctx)) goto err;
- if (!BN_add(s,tmp,m)) goto err;
- if (BN_cmp(s,order) > 0)
- BN_sub(s,s,order);
- if (!BN_mod_mul(s,s,kinv,order,ctx)) goto err;
+ if (!BN_mod_mul(tmp, eckey->priv_key, 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, kinv, order, ctx))
+ {
+ ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
+ goto err;
+ }
}
while (BN_is_zero(s));
- if ((ret = ECDSA_SIG_new()) == NULL)
- {
- reason = ECDSA_R_SIGNATURE_MALLOC_FAILED;
- goto err;
- }
- if (BN_copy(ret->r, r) == NULL || BN_copy(ret->s, s) == NULL)
+ ok = 1;
+err:
+ if (!ok)
{
ECDSA_SIG_free(ret);
ret = NULL;
- reason = ERR_R_BN_LIB;
}
-
-err:
- if (!ret)
- {
- ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,reason);
- }
- if (r != NULL) BN_clear_free(r);
- if (s != NULL) BN_clear_free(s);
- if (ctx != NULL) BN_CTX_free(ctx);
- if (m != NULL) BN_clear_free(m);
- if (tmp != NULL) BN_clear_free(tmp);
- if (order != NULL) BN_clear_free(order);
- if (kinv != NULL) BN_clear_free(kinv);
- return(ret);
+ if (ctx)
+ BN_CTX_free(ctx);
+ if (m)
+ BN_clear_free(m);
+ if (tmp)
+ BN_clear_free(tmp);
+ if (order)
+ BN_free(order);
+ if (kinv)
+ BN_clear_free(kinv);
+ return ret;
}
-static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len, ECDSA_SIG *sig,
- ECDSA *ecdsa)
+static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
+ const ECDSA_SIG *sig, EC_KEY *eckey)
{
- BN_CTX *ctx;
- BIGNUM *order=NULL,*u1=NULL,*u2=NULL,*m=NULL,*X=NULL;
- EC_POINT *point=NULL;
- int ret = -1,reason = ERR_R_BN_LIB;
- if (!ecdsa || !ecdsa->group || !ecdsa->pub_key || !sig)
+ int ret = -1;
+ BN_CTX *ctx;
+ BIGNUM *order, *u1, *u2, *m, *X;
+ EC_POINT *point = NULL;
+ EC_GROUP *group;
+ /* check input values */
+ if (!eckey || !eckey->group || !eckey->pub_key || !sig)
{
- reason = ECDSA_R_MISSING_PARAMETERS;
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_MISSING_PARAMETERS);
return -1;
}
- if ((ctx = BN_CTX_new()) == NULL) goto err;
- if ((order = BN_new()) == NULL) goto err;
- if ((u1 = BN_new()) == NULL) goto err;
- if ((u2 = BN_new()) == NULL) goto err;
- if ((m = BN_new()) == NULL) goto err;
- if ((X = BN_new()) == NULL) goto err;
- if (!EC_GROUP_get_order(ecdsa->group,order,ctx)) goto err;
+ group = eckey->group;
- if (BN_is_zero(sig->r) || sig->r->neg || BN_ucmp(sig->r, order) >= 0)
+ ctx = BN_CTX_new();
+ if (!ctx)
+ {
+ 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)
{
- reason = ECDSA_R_BAD_SIGNATURE;
- ret = 0;
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
- if (BN_is_zero(sig->s) || sig->s->neg || BN_ucmp(sig->s, order) >= 0)
+
+ if (!EC_GROUP_get_order(group, order, ctx))
{
- reason = ECDSA_R_BAD_SIGNATURE;
- ret = 0;
+ 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)) == NULL) goto err;
+ if (!BN_mod_inverse(u2, sig->s, order, ctx))
+ {
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
+ goto err;
+ }
/* digest -> m */
- if (BN_bin2bn(dgst,dgst_len,m) == NULL) goto err;
+ if (!BN_bin2bn(dgst, dgst_len, m))
+ {
+ 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)) goto err;
+ 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)) goto err;
+ 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(ecdsa->group)) == NULL)
+ if ((point = EC_POINT_new(group)) == NULL)
{
- reason = ERR_R_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
- if (!EC_POINT_mul(ecdsa->group,point,u1,ecdsa->pub_key,u2,ctx)
- || !EC_POINT_get_affine_coordinates(ecdsa->group,point,X,NULL,ctx))
+ if (!EC_POINT_mul(group, point, u1, eckey->pub_key, u2, ctx))
{
- reason = ERR_R_EC_LIB;
+ ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
goto err;
}
- if (!BN_nnmod(u1,X,order,ctx)) goto err;
-
- /* is now in u1. If the signature is correct, it will be
- * equal to R. */
- ret = (BN_ucmp(u1,sig->r) == 0);
-
- err:
- if (ret != 1) ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY,reason);
- if (ctx != NULL) BN_CTX_free(ctx);
- if (u1 != NULL) BN_clear_free(u1);
- if (u2 != NULL) BN_clear_free(u2);
- if (m != NULL) BN_clear_free(m);
- if (X != NULL) BN_clear_free(X);
- if (order != NULL) BN_clear_free(order);
- if (point != NULL) EC_POINT_free(point);
- return(ret);
+ 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_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+ else /* NID_X9_62_characteristic_two_field */
+ {
+ if (!EC_POINT_get_affine_coordinates_GF2m(group,
+ point, X, NULL, ctx))
+ {
+ ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+ goto err;
+ }
+ }
+
+ 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);
+ if (point)
+ EC_POINT_free(point);
+ return ret;
}
projects / openssl.git / blobdiff