+ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
+ ECPKPARAMETERS *params)
+{
+ int ok = 1, tmp;
+ ECPKPARAMETERS *ret = params;
+
+ if (ret == NULL) {
+ if ((ret = ECPKPARAMETERS_new()) == NULL) {
+ ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+ } else {
+ if (ret->type == 0)
+ ASN1_OBJECT_free(ret->value.named_curve);
+ else if (ret->type == 1 && ret->value.parameters)
+ ECPARAMETERS_free(ret->value.parameters);
+ }
+
+ if (EC_GROUP_get_asn1_flag(group)) {
+ /*
+ * use the asn1 OID to describe the elliptic curve parameters
+ */
+ tmp = EC_GROUP_get_curve_name(group);
+ if (tmp) {
+ ret->type = 0;
+ if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
+ ok = 0;
+ } else
+ /* we don't know the nid => ERROR */
+ ok = 0;
+ } else {
+ /* use the ECPARAMETERS structure */
+ ret->type = 1;
+ if ((ret->value.parameters =
+ EC_GROUP_get_ecparameters(group, NULL)) == NULL)
+ ok = 0;
+ }
+
+ if (!ok) {
+ ECPKPARAMETERS_free(ret);
+ return NULL;
+ }
+ return ret;
+}
+
+EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
+{
+ int ok = 0, tmp;
+ EC_GROUP *ret = NULL;
+ BIGNUM *p = NULL, *a = NULL, *b = NULL;
+ EC_POINT *point = NULL;
+ long field_bits;
+
+ if (!params->fieldID || !params->fieldID->fieldType ||
+ !params->fieldID->p.ptr) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+
+ /* now extract the curve parameters a and b */
+ if (!params->curve || !params->curve->a ||
+ !params->curve->a->data || !params->curve->b ||
+ !params->curve->b->data) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+ a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
+ if (a == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
+ goto err;
+ }
+ b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
+ if (b == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
+ goto err;
+ }
+
+ /* get the field parameters */
+ tmp = OBJ_obj2nid(params->fieldID->fieldType);
+ if (tmp == NID_X9_62_characteristic_two_field)
+#ifdef OPENSSL_NO_EC2M
+ {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
+ goto err;
+ }
+#else
+ {
+ X9_62_CHARACTERISTIC_TWO *char_two;
+
+ char_two = params->fieldID->p.char_two;
+
+ field_bits = char_two->m;
+ if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
+ goto err;
+ }
+
+ if ((p = BN_new()) == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ /* get the base type */
+ tmp = OBJ_obj2nid(char_two->type);
+
+ if (tmp == NID_X9_62_tpBasis) {
+ long tmp_long;
+
+ if (!char_two->p.tpBasis) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+
+ tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
+
+ if (!(char_two->m > tmp_long && tmp_long > 0)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
+ EC_R_INVALID_TRINOMIAL_BASIS);
+ goto err;
+ }
+
+ /* create the polynomial */
+ if (!BN_set_bit(p, (int)char_two->m))
+ goto err;
+ if (!BN_set_bit(p, (int)tmp_long))
+ goto err;
+ if (!BN_set_bit(p, 0))
+ goto err;
+ } else if (tmp == NID_X9_62_ppBasis) {
+ X9_62_PENTANOMIAL *penta;
+
+ penta = char_two->p.ppBasis;
+ if (!penta) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+
+ if (!
+ (char_two->m > penta->k3 && penta->k3 > penta->k2
+ && penta->k2 > penta->k1 && penta->k1 > 0)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
+ EC_R_INVALID_PENTANOMIAL_BASIS);
+ goto err;
+ }
+
+ /* create the polynomial */
+ if (!BN_set_bit(p, (int)char_two->m))
+ goto err;
+ if (!BN_set_bit(p, (int)penta->k1))
+ goto err;
+ if (!BN_set_bit(p, (int)penta->k2))
+ goto err;
+ if (!BN_set_bit(p, (int)penta->k3))
+ goto err;
+ if (!BN_set_bit(p, 0))
+ goto err;
+ } else if (tmp == NID_X9_62_onBasis) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
+ goto err;
+ } else { /* error */
+
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+
+ /* create the EC_GROUP structure */
+ ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
+ }
+#endif
+ else if (tmp == NID_X9_62_prime_field) {
+ /* we have a curve over a prime field */
+ /* extract the prime number */
+ if (!params->fieldID->p.prime) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+ p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
+ if (p == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
+ goto err;
+ }
+
+ if (BN_is_negative(p) || BN_is_zero(p)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
+ goto err;
+ }
+
+ field_bits = BN_num_bits(p);
+ if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
+ goto err;
+ }
+
+ /* create the EC_GROUP structure */
+ ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
+ } else {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
+ goto err;
+ }
+
+ if (ret == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ /* extract seed (optional) */
+ if (params->curve->seed != NULL) {
+ OPENSSL_free(ret->seed);
+ if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ memcpy(ret->seed, params->curve->seed->data,
+ params->curve->seed->length);
+ ret->seed_len = params->curve->seed->length;
+ }
+
+ if (!params->order || !params->base || !params->base->data) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
+ goto err;
+ }
+
+ if ((point = EC_POINT_new(ret)) == NULL)
+ goto err;
+
+ /* set the point conversion form */
+ EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
+ (params->base->data[0] & ~0x01));
+
+ /* extract the ec point */
+ if (!EC_POINT_oct2point(ret, point, params->base->data,
+ params->base->length, NULL)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ /* extract the order */
+ if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
+ goto err;
+ }
+ if (BN_is_negative(a) || BN_is_zero(a)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+ if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
+ goto err;
+ }
+
+ /* extract the cofactor (optional) */
+ if (params->cofactor == NULL) {
+ BN_free(b);
+ b = NULL;
+ } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
+ goto err;
+ }
+ /* set the generator, order and cofactor (if present) */
+ if (!EC_GROUP_set_generator(ret, point, a, b)) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
+ goto err;
+ }
+
+ ok = 1;
+
+ err:
+ if (!ok) {
+ EC_GROUP_clear_free(ret);
+ ret = NULL;
+ }
+
+ BN_free(p);
+ BN_free(a);
+ BN_free(b);
+ EC_POINT_free(point);
+ return ret;
+}
+
+EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
+{
+ EC_GROUP *ret = NULL;
+ int tmp = 0;
+
+ if (params == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
+ return NULL;
+ }
+
+ if (params->type == 0) { /* the curve is given by an OID */
+ tmp = OBJ_obj2nid(params->value.named_curve);
+ if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
+ EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
+ return NULL;
+ }
+ EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
+ } else if (params->type == 1) { /* the parameters are given by a
+ * ECPARAMETERS structure */
+ ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
+ if (!ret) {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
+ return NULL;
+ }
+ EC_GROUP_set_asn1_flag(ret, 0x0);
+ } else if (params->type == 2) { /* implicitlyCA */
+ return NULL;
+ } else {
+ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
+ return NULL;
+ }
+
+ return ret;