static ECDSA_DATA *
ECDSA_DATA_new_method(ENGINE *engine)
{
ECDSA_DATA *ret;
ret = malloc(sizeof(ECDSA_DATA));
if (ret == NULL) {
ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
return (NULL);
}
ret->init = NULL;
ret->meth = ECDSA_get_default_method();
ret->engine = engine;
#ifndef OPENSSL_NO_ENGINE
if (!ret->engine)
ret->engine = ENGINE_get_default_ECDSA();
if (ret->engine) {
ret->meth = ENGINE_get_ECDSA(ret->engine);
if (!ret->meth) {
ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD,
ERR_R_ENGINE_LIB);
ENGINE_finish(ret->engine);
free(ret);
return NULL;
}
}
#endif
ret->flags = ret->meth->flags;
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
return (ret);
}
ECDSA_DATA *ecdsa_check(EC_KEY *key)
{
ECDSA_DATA *ecdsa_data;
void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
ecdsa_data_free, ecdsa_data_free);
if (data == NULL) {
ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
if (ecdsa_data == NULL)
return NULL;
data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
ecdsa_data_dup, ecdsa_data_free,
ecdsa_data_free);
if (data != NULL) {
/*
* Another thread raced us to install the key_method data and
* won.
*/
ecdsa_data_free(ecdsa_data);
ecdsa_data = (ECDSA_DATA *)data;
}
} else
ecdsa_data = (ECDSA_DATA *)data;
#ifdef OPENSSL_FIPS
if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD)
&& !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) {
ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD);
return NULL;
}
#endif
return ecdsa_data;
}
ECDSA_DATA *ecdsa_check(EC_KEY *key)
{
ECDSA_DATA *ecdsa_data;
void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
ecdsa_data_free, ecdsa_data_free);
if (data == NULL)
{
ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
if (ecdsa_data == NULL)
return NULL;
EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
}
else
ecdsa_data = (ECDSA_DATA *)data;
#ifdef OPENSSL_FIPS
if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD)
&& !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW))
{
ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD);
return NULL;
}
#endif
return ecdsa_data;
}
ECDSA_METHOD *ECDSA_METHOD_new(ECDSA_METHOD *ecdsa_meth)
{
ECDSA_METHOD *ret;
ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
ECDSAerr(ECDSA_F_ECDSA_METHOD_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
if (ecdsa_meth)
*ret = *ecdsa_meth;
ret->flags |= ECDSA_METHOD_FLAG_ALLOCATED;
return ret;
}
int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp)
{
ECDSA_DATA *ecdsa = ecdsa_check(eckey);
if (ecdsa == NULL)
return 0;
if (EC_KEY_get_nonce_from_hash(eckey))
{
/* You cannot precompute the ECDSA nonce if it is required to
* depend on the message. */
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ECDSA_R_NONCE_CANNOT_BE_PRECOMPUTED);
return 0;
}
return ecdsa->meth->ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
}
ECDSA_METHOD *ECDSA_METHOD_new(ECDSA_METHOD *ecdsa_meth)
{
ECDSA_METHOD *ret;
ret = OPENSSL_malloc(sizeof(ECDSA_METHOD));
if (ret == NULL) {
ECDSAerr(ECDSA_F_ECDSA_METHOD_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
if (ecdsa_meth)
*ret = *ecdsa_meth;
else {
ret->ecdsa_sign_setup = 0;
ret->ecdsa_do_sign = 0;
ret->ecdsa_do_verify = 0;
ret->name = NULL;
ret->flags = 0;
}
ret->flags |= ECDSA_METHOD_FLAG_ALLOCATED;
return ret;
}
static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp)
{
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 || !r || !order || !X)
{
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 (!BN_rand_range(k, order))
{
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,
ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
goto err;
}
while (BN_is_zero(k));
/* 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;
}
}
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))
{
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
goto err;
}
}
while (BN_is_zero(r));
/* compute the inverse of k */
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);
if (*kinvp != NULL)
BN_clear_free(*kinvp);
/* save the pre-computed values */
*rp = r;
*kinvp = k;
ret = 1;
err:
if (!ret)
{
if (k != NULL) BN_clear_free(k);
if (r != NULL) BN_clear_free(r);
}
if (ctx_in == NULL)
BN_CTX_free(ctx);
if (order != NULL)
BN_free(order);
if (tmp_point != NULL)
EC_POINT_free(tmp_point);
if (X)
BN_clear_free(X);
return(ret);
}
static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
const ECDSA_SIG *sig, EC_KEY *eckey)
{
int ret = -1;
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)
{
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 (8 * dgst_len > BN_num_bits(order))
{
/* XXX
*
* Should provide for optional hash truncation:
* Keep the BN_num_bits(order) leftmost bits of dgst
* (see March 2006 FIPS 186-3 draft, which has a few
* confusing errors in this part though)
*/
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY,
ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
ret = 0;
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 */
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))
{
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;
}
}
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;
}
}
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;
}
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;
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)
{
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;
}
if (8 * dgst_len > BN_num_bits(order))
{
/* XXX
*
* Should provide for optional hash truncation:
* Keep the BN_num_bits(order) leftmost bits of dgst
* (see March 2006 FIPS 186-3 draft, which has a few
* confusing errors in this part though)
*/
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
goto err;
}
if (!BN_bin2bn(dgst, dgst_len, m))
{
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))
{
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;
}
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;
}
// unsigned char *rgbHashData, 哈希
// unsigned char *rgbKeyDb, 私钥
// unsigned char *rs 签名
void eccHashSign(unsigned char *rgbHashData, unsigned char *rgbKeyDb, unsigned char *rs)
{
int ok = 0;
const EC_GROUP *ec_group;
BIGNUM *priv_key;
const BIGNUM *ck;
BIGNUM *k = NULL;
BN_CTX *ctx = NULL;
BIGNUM *order = NULL;
BIGNUM *e = NULL;
BIGNUM *bn = NULL;
int i;
BIGNUM *r= BN_new(), *s = BN_new();
EC_KEY *ec_key = EC_KEY_new_by_curve_name(NID_sm2p256v1);
ec_group = EC_KEY_get0_group(ec_key);
priv_key = BN_new();
BN_bin2bn(rgbKeyDb, 32, priv_key);
EC_KEY_set_private_key(ec_key, priv_key);
if (!ec_group || !priv_key) {
}
ctx = BN_CTX_new();
order = BN_new();
e = BN_new();
bn = BN_new();
if (!ctx || !order || !e || !bn) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_GROUP_get_order(ec_group, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_EC_LIB);
goto err;
}
/* convert dgst to e */
i = BN_num_bits(order);
#if 0
if (8 * dgst_len > i) {
dgst_len = (i + 7)/8;
}
#endif
if (!BN_bin2bn(rgbHashData, 32, e)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
#if 0
if ((8 * dgst_len > i) && !BN_rshift(e, e, 8 - (i & 0x7))) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
#endif
do {
/* use or compute k and (kG).x */
if (!sm2_sign_setup(ec_key, ctx, &k, &r)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,ERR_R_ECDSA_LIB);
goto err;
}
ck = k;
/* r = e + x (mod n) */
if (!BN_mod_add(r, r, e, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_add(bn, r, ck, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
/* check r != 0 && r + k != n */
if (BN_is_zero(r) || BN_is_zero(bn)) {
continue;
}
/* s = ((1 + d)^-1 * (k - rd)) mod n */
if (!BN_one(bn)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_add(s, priv_key, bn, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_inverse(s, s, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_mul(bn, r, priv_key, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_sub(bn, ck, bn, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
if (!BN_mod_mul(s, s, bn, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
/* check s != 0 */
if (!BN_is_zero(s))
break;
} while (1);
ok = 1;
BN_bn2bin(r, rs);
BN_bn2bin(s, rs + 32);
err:
if (k) BN_free(k);
if (ctx) BN_CTX_free(ctx);
if (order) BN_free(order);
if (e) BN_free(e);
if (bn) BN_free(bn);
}
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)
{
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);
if (point)
EC_POINT_free(point);
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, *order = NULL;
const BIGNUM *ckinv;
BN_CTX *ctx = NULL;
const EC_GROUP *group;
ECDSA_SIG *ret;
ECDSA_DATA *ecdsa;
const BIGNUM *priv_key;
BN_MONT_CTX *mont_data;
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) {
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 ||
(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;
}
mont_data = EC_GROUP_get_mont_data(group);
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)) {
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;
}
}
/*
* With only one multiplicant being in Montgomery domain
* multiplication yields real result without post-conversion.
* Also note that all operations but last are performed with
* zero-padded vectors. Last operation, BN_mod_mul_montgomery
* below, returns user-visible value with removed zero padding.
*/
if (!bn_to_mont_fixed_top(s, ret->r, mont_data, ctx)
|| !bn_mul_mont_fixed_top(s, s, priv_key, mont_data, ctx)) {
goto err;
}
if (!bn_mod_add_fixed_top(s, s, m, order)) {
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN, ERR_R_BN_LIB);
goto err;
}
/*
* |s| can still be larger than modulus, because |m| can be. In
* such case we count on Montgomery reduction to tie it up.
*/
if (!bn_to_mont_fixed_top(s, s, mont_data, ctx)
|| !BN_mod_mul_montgomery(s, s, ckinv, mont_data, 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;
}
if (ctx)
BN_CTX_free(ctx);
if (m)
BN_clear_free(m);
if (order)
BN_free(order);
if (kinv)
BN_clear_free(kinv);
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;
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)
{
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;
}
if (dgst_len > BN_num_bytes(order))
{
ECDSAerr(ECDSA_F_ECDSA_DO_SIGN,
ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
goto err;
}
if (!BN_bin2bn(dgst, dgst_len, m))
{
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))
{
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;
}
}
while (BN_is_zero(s));
ok = 1;
err:
if (!ok)
{
ECDSA_SIG_free(ret);
ret = NULL;
}
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;
}
// unsigned char *rgbHashData, 哈希数值
// unsigned char *rgbKeyPb, SM2公钥数据，Px Py 不含标志位 point_conversion_form_t
// unsigned char *rs 待验证的签名数据
unsigned char eccVerifySignature(unsigned char *rgbHashData, unsigned char *rgbKeyPb, unsigned char *rs)
{
int ret = SM2_VERIFY_INNER_ERROR;
EC_POINT *point = NULL;
BN_CTX *ctx = NULL;
BIGNUM *order = NULL;
BIGNUM *e = NULL;
BIGNUM *t = NULL;
int i;
EC_KEY *ec_key = EC_KEY_new_by_curve_name(NID_sm2p256v1);
BIGNUM *x = BN_new();;
BIGNUM *y = BN_new();;
if (!BN_bin2bn(rgbKeyPb, 32, x)) {
goto err;
}
if (!BN_bin2bn(rgbKeyPb + 32, 32, y)) {
goto err;
}
if (!EC_KEY_set_public_key_affine_coordinates(ec_key, x, y)) {
goto err;
}
const EC_POINT *pub_key = EC_KEY_get0_public_key(ec_key);
BIGNUM *r= BN_new(), *s = BN_new();
BN_bin2bn(rs, 32, r);
BN_bin2bn(rs + 32, 32, s);
//// 相当于
//EC_KEY *ret = EC_KEY_new();
EC_GROUP *ec_group = EC_GROUP_new_by_curve_name(NID_sm2p256v1);
ctx = BN_CTX_new();
order = BN_new();
e = BN_new();
t = BN_new();
if (!ctx || !order || !e || !t) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_GROUP_get_order(ec_group, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
goto err;
}
/* check r, s in [1, n-1] and r + s != 0 (mod n) */
if (BN_is_zero(r) ||
BN_is_negative(r) ||
BN_ucmp(r, order) >= 0 ||
BN_is_zero(s) ||
BN_is_negative(s) ||
BN_ucmp(s, order) >= 0) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ECDSA_R_BAD_SIGNATURE);
ret = 0;
goto err;
}
/* check t = r + s != 0 */
if (!BN_mod_add(t, r, s, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
if (BN_is_zero(t)) {
ret = 0;
goto err;
}
/* convert digest to e */
i = BN_num_bits(order);
#if 0
if (8 * dgstlen > i) {
dgstlen = (i + 7)/8;
}
#endif
if (!BN_bin2bn(rgbHashData, 32, e)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
#if 0
if ((8 * dgstlen > i) && !BN_rshift(e, e, 8 - (i & 0x7))) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
#endif
/* compute (x, y) = sG + tP, P is pub_key */
if (!(point = EC_POINT_new(ec_group))) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_POINT_mul(ec_group, point, s, pub_key, t, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
goto err;
}
if (EC_METHOD_get_field_type(EC_GROUP_method_of(ec_group)) == NID_X9_62_prime_field) {
if (!EC_POINT_get_affine_coordinates_GFp(ec_group, point, t, NULL, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
goto err;
}
} else /* NID_X9_62_characteristic_two_field */ {
if (!EC_POINT_get_affine_coordinates_GF2m(ec_group, point, t, NULL, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_EC_LIB);
goto err;
}
}
if (!BN_nnmod(t, t, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
/* check (sG + tP).x + e == sig.r */
if (!BN_mod_add(t, t, e, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_DO_VERIFY, ERR_R_BN_LIB);
goto err;
}
if (BN_ucmp(t, r) == 0) {
ret = SM2_VERIFY_SUCCESS;
} else {
ret = SM2_VERIFY_FAILED;
}
err:
if (point) EC_POINT_free(point);
if (order) BN_free(order);
if (e) BN_free(e);
if (t) BN_free(t);
if (ctx) BN_CTX_free(ctx);
return 0;
}
static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp)
{
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;
int order_bits;
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 || !r || !order || !X) {
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;
}
/* Preallocate space */
order_bits = BN_num_bits(order);
if (!BN_set_bit(k, order_bits)
|| !BN_set_bit(r, order_bits)
|| !BN_set_bit(X, order_bits))
goto err;
do {
/* get random k */
do
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.
*
* We unconditionally perform both of these additions to prevent a
* small timing information leakage. We then choose the sum that is
* one bit longer than the order. This guarantees the code
* path used in the constant time implementations elsewhere.
*
* TODO: revisit the BN_copy aiming for a memory access agnostic
* conditional copy.
*/
if (!BN_add(r, k, order)
|| !BN_add(X, r, order)
|| !BN_copy(k, BN_num_bits(r) > order_bits ? r : X))
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 */
if (*rp != NULL)
BN_clear_free(*rp);
if (*kinvp != NULL)
BN_clear_free(*kinvp);
/* save the pre-computed values */
*rp = r;
*kinvp = k;
ret = 1;
err:
if (!ret) {
if (k != NULL)
BN_clear_free(k);
if (r != NULL)
BN_clear_free(r);
}
if (ctx_in == NULL)
BN_CTX_free(ctx);
if (order != NULL)
BN_free(order);
if (tmp_point != NULL)
EC_POINT_free(tmp_point);
if (X)
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;
}
#ifdef OPENSSL_FIPS
if (!fips_check_ec_prng(eckey))
return NULL;
#endif
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(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->meth->ecdsa_sign_setup(eckey, ctx,
&kinv, &ret->r))
{
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;
}
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_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 || !r || !order || !X)
{
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
#ifndef OPENSSL_NO_SHA512
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
#endif
{
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 */
if (*rp != NULL)
BN_clear_free(*rp);
if (*kinvp != NULL)
BN_clear_free(*kinvp);
/* save the pre-computed values */
*rp = r;
*kinvp = k;
ret = 1;
err:
if (!ret)
{
if (k != NULL) BN_clear_free(k);
if (r != NULL) BN_clear_free(r);
}
if (ctx_in == NULL)
BN_CTX_free(ctx);
if (order != NULL)
BN_free(order);
if (tmp_point != NULL)
EC_POINT_free(tmp_point);
if (X)
BN_clear_free(X);
return(ret);
}
static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp)
{
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 || !r || !order || !X)
{
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;
}
#ifdef OPENSSL_FIPS
if (!fips_check_ec_prng(eckey))
goto err;
#endif
do
{
/* get random k */
do
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));
#ifdef ECDSA_POINT_MUL_NO_CONSTTIME
/* 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;
#endif /* def(ECDSA_POINT_MUL_NO_CONSTTIME) */
/* 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 (!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);
if (*kinvp != NULL)
BN_clear_free(*kinvp);
/* save the pre-computed values */
*rp = r;
*kinvp = k;
ret = 1;
err:
if (!ret)
{
if (k != NULL) BN_clear_free(k);
if (r != NULL) BN_clear_free(r);
}
if (ctx_in == NULL)
BN_CTX_free(ctx);
if (order != NULL)
BN_free(order);
if (tmp_point != NULL)
EC_POINT_free(tmp_point);
if (X)
BN_clear_free(X);
return(ret);
}
/* k in [1, n-1], (x, y) = kG */
static int sm2_sign_setup(EC_KEY *ec_key, BN_CTX *ctx_in, BIGNUM **kp, BIGNUM **xp)
{
int ret = 0;
const EC_GROUP *ec_group;
BN_CTX *ctx = NULL;
BIGNUM *k = NULL;
BIGNUM *x = NULL;
BIGNUM *order = NULL;
EC_POINT *point = NULL;
if (ec_key == NULL || (ec_group = EC_KEY_get0_group(ec_key)) == 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();
x = BN_new();
order = BN_new();
if (!k || !x || !order) {
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_GROUP_get_order(ec_group, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
goto err;
}
if ((point = EC_POINT_new(ec_group)) == NULL) {
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
goto err;
}
do {
/* get random k */
do {
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));
/* compute r the x-coordinate of generator * k */
if (!EC_POINT_mul(ec_group, 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(ec_group)) == NID_X9_62_prime_field) {
if (!EC_POINT_get_affine_coordinates_GFp(ec_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(ec_group, point, x, NULL, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_EC_LIB);
goto err;
}
}
//FIXME: do we need this?
if (!BN_nnmod(x, x, order, ctx)) {
ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
goto err;
}
} while (BN_is_zero(x));
/* clear old values if necessary */
if (*kp != NULL)
BN_clear_free(*kp);
if (*xp != NULL)
BN_clear_free(*xp);
/* save the pre-computed values */
*kp = k;
*xp = x;
ret = 1;
err:
if (!ret) {
if (k) BN_clear_free(k);
if (x) BN_clear_free(x);
}
if (ctx_in == NULL) BN_CTX_free(ctx);
if (order) BN_free(order);
if (point) EC_POINT_free(point);
return(ret);
}
