113

main.c部分代码：

int main(){
   void **pdh;
   pdh=(void **)malloc(20);
   int ret;
   ret = SDF_OpenDevice(pdh);
   if(ret != SDR_OK)
   {
	   printf("打开设备失败\n");
   }
   else
   {
	   printf("打开设备成功！\n");
	 }
   printf("查看设备信息\n");
   DEVICEINFO a;
   ret = SDF_GetDeviceInfo(*pdh,&a);
   if(ret !=SDR_OK)
           printf("查看设备信息失败！\n");
   else
           printf("查看设备信息成功！\n");
   printf("设备名字叫做%s\n",a.DeviceName);
   printf("设备版本号为%d\n",a.DeviceVersion);
   printf("想要获取的随机数长度(多少字节)为：\n");
   int n;
   scanf("%d",&n);
   char string[100];
   ret = SDF_GenerateRandom(*pdh,n*8,string);
   if(ret !=SDR_OK)
	   printf("生成随机数失败！");
    else
	    printf("生成的随机数为%s\n",string);

　sdf.c部分代码：

static int getRandom(char *r, int length)
{
        BIGNUM *bn;
        int i;
        bn = BN_new(); //生成一个BIGNUM结构

        //int bits = 20;
        int top = -1;
        int bottom = 1;

        BN_rand(bn, length *8, top, bottom); //生成指定bits的随机数   uilength是bits数= length *8，而length是字节数 = uilengh/8

        char *a = BN_bn2hex(bn); //转化成16进制字符串
        //puts(a);
        //printf("\n");
        for(i=0;*(a+i)!='\0';i++)
        {
            *(r+i)=*(a+i);
        }

        *(r+i)='\0';
        BN_free(bn); //释放BIGNUM结构
        return 0;
}
int SDF_GenerateRandom (void * hSessionHandle,unsigned int uiLength,unsigned char * pucRandom)
{
        int k=getRandom(pucRandom,uiLength/8);
        if(k==0)
        printf("生成随机数成功！");
        
        return SDR_OK;
}