return (ok) ? gost_ec_compute_public(ec) : 0;
}
+
+int gost_ec_oct2point(const EC_GROUP *group, EC_POINT *point,
+ const unsigned char *buf, size_t len)
+{
+ BN_CTX *ctx = NULL;
+ BIGNUM *x, *y, *p;
+ size_t field_len, enc_len;
+ int ret = 0;
+
+ if (len == 0) {
+ GOSTerr(GOST_F_GOST_EC_OCT2POINT, EC_R_BUFFER_TOO_SMALL);
+ return 0;
+ }
+
+ field_len = (EC_GROUP_get_degree(group) + 7) / 8;
+ enc_len = 2 * field_len;
+
+ if (len != enc_len) {
+ GOSTerr(GOST_F_GOST_EC_OCT2POINT, EC_R_INVALID_ENCODING);
+ return 0;
+ }
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL)
+ return 0;
+
+ BN_CTX_start(ctx);
+ x = BN_CTX_get(ctx);
+ y = BN_CTX_get(ctx);
+ p = BN_CTX_get(ctx);
+ if (y == NULL)
+ goto err;
+
+ if (!EC_GROUP_get_curve(group, p, NULL, NULL, NULL))
+ goto err;
+
+ if (!BN_lebin2bn(buf, field_len, x))
+ goto err;
+ if (BN_ucmp(x, p) >= 0) {
+ GOSTerr(GOST_F_GOST_EC_OCT2POINT, EC_R_INVALID_ENCODING);
+ goto err;
+ }
+
+ if (!BN_lebin2bn(buf + field_len, field_len, y))
+ goto err;
+ if (BN_ucmp(y, p) >= 0) {
+ GOSTerr(GOST_F_GOST_EC_OCT2POINT, EC_R_INVALID_ENCODING);
+ goto err;
+ }
+
+ /*
+ * EC_POINT_set_affine_coordinates is responsible for checking that
+ * the point is on the curve.
+ */
+ if (!EC_POINT_set_affine_coordinates(group, point, x, y, ctx))
+ goto err;
+
+ ret = 1;
+
+ err:
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ret;
+}
+
+
+size_t gost_ec_point2oct(const EC_GROUP *group, const EC_POINT *point,
+ unsigned char *buf, size_t len)
+{
+ size_t ret;
+ BN_CTX *ctx = NULL;
+ int used_ctx = 0;
+ BIGNUM *x, *y;
+ size_t field_len;
+
+ field_len = (EC_GROUP_get_degree(group) + 7) / 8;
+ ret = 2 * field_len;
+
+ if (buf != NULL) {
+ if (len < ret) {
+ GOSTerr(GOST_F_GOST_EC_POINT2OCT, EC_R_BUFFER_TOO_SMALL);
+ goto err;
+ }
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL)
+ return 0;
+
+ BN_CTX_start(ctx);
+ used_ctx = 1;
+ x = BN_CTX_get(ctx);
+ y = BN_CTX_get(ctx);
+ if (y == NULL)
+ goto err;
+
+ if (!EC_POINT_get_affine_coordinates(group, point, x, y, ctx))
+ goto err;
+
+ if (BN_bn2lebinpad(x, buf, field_len) != field_len
+ || BN_bn2lebinpad(y, buf + field_len, field_len) != field_len)
+ goto err;
+ }
+
+ if (used_ctx)
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ret;
+
+ err:
+ if (used_ctx)
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return 0;
+}
+
+size_t gost_ec_key2buf(const EC_KEY *key, unsigned char **pbuf)
+{
+ size_t len;
+ unsigned char *buf;
+ const EC_GROUP *grp = NULL;
+ const EC_POINT *pkey = NULL;
+
+ pkey = EC_KEY_get0_public_key(key);
+ grp = EC_KEY_get0_group(key);
+
+ if(pkey == NULL || grp == NULL)
+ return 0;
+
+ len = gost_ec_point2oct(grp, pkey, NULL, 0);
+ if (len == 0)
+ return 0;
+ if ((buf = OPENSSL_malloc(len)) == NULL) {
+ GOSTerr(GOST_F_GOST_EC_KEY2BUF, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ len = gost_ec_point2oct(grp, pkey, buf, len);
+ if (len == 0) {
+ OPENSSL_free(buf);
+ return 0;
+ }
+ *pbuf = buf;
+ return len;
+}
+
+int gost_ec_oct2key(EC_KEY *key, const unsigned char *buf, size_t len)
+{
+ const EC_GROUP *group = NULL;
+ const EC_POINT *pub_key = NULL;
+ EC_POINT *point = NULL;
+ int ok = 0;
+
+ if (key == NULL || (group = EC_KEY_get0_group(key)) == NULL)
+ return 0;
+
+ if ((pub_key = EC_KEY_get0_public_key(key)) == NULL) {
+ if((point = EC_POINT_new(group)) == NULL ||
+ !EC_KEY_set_public_key(key, point))
+ goto err;
+ pub_key = EC_KEY_get0_public_key(key);
+ }
+
+ if (gost_ec_oct2point(group, (EC_POINT *)pub_key, buf, len) == 0)
+ goto err;
+
+ ok = 1;
+
+ err:
+ if (point)
+ EC_POINT_free(point);
+ return ok;
+}