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int test_sm2_enc()
{
    EC_KEY *key1;
    EC_GROUP    *group1;
    int nid,ret;

    key1 = EC_KEY_new();
    if(!key1)
        return 0;

    int nid = NID_sm2p256v1;
    group1 = EC_GROUP_new_by_curve_name(nid);
    if(group1 == NULL)
        return 0;

    ret = EC_KEY_set_group(key1,group1);
    if(ret != 1)
        return 0;

    ret = EC_KEY_generate_key(key1);

    //EC_KEY_print_fp(stdout,key1,0);
    /*---- ----*/

    printf("----加密测试----\n");
    char tmp_buf[48] = {0};
    memset(tmp_buf,'1',48);

    char out_buf[48+128] = {0};
    int buf_size = 48 +128;

    if(!SM2_encrypt_with_recommended(out_buf,&buf_size,
                (const unsigned char *)tmp_buf,sizeof(tmp_buf),key1)) {
        printf("SM2 Encryp ERROR !!!\n");
        return -1;
    }
    else
    {
        printf("SM2 Encrypt Result[%d] :\n",buf_size);
        //print_hex(out_buf,buf_size);
        printf("----测试成功----\n\n");
    }

    printf("----解密测试----\n");
    unsigned char msg[128] = {0};
    size_t msglen = 0;
    if(!SM2_decrypt_with_recommended(msg,&msglen,out_buf,buf_size,key1))
    {
        printf("解密失败！！！\n");
        return -1;
    }else {
        printf("SM2 Decrypt Result[%d] :\n",msglen);
        //print_hex(msg,msglen);
        printf("----测试成功----\n\n");
    }

    return 0;
}