OpenSSL测试-随机数

0. 在openEuler(推荐)或Ubuntu或Windows(不推荐)中完成下面任务

1. 使用OpenSSL定义一个私有函数 static int getRandom(char *r, int length), 获取length个字节的随机数（5‘）

2. 把上述函数集成到src中的sdf.c中的SDF_GenerateRandom中（5'）

3. 在test中的main.c调用SDF_GenerateRandom进行测试，至少测试1个字节，5个字节，20个字节三种情况。（5‘）

4. 提交代码（或代码链接）和运行结果截图

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;
}

#include "sdf.h"
#include <stdio.h>
#include <stdlib.h>
#include <openssl/rand.h>

int main(){

    void ** pdh;
        pdh = (void **) malloc(20);
        int ret;

    ret = SDF_OpenDevice(pdh);
        if(ret != SDR_OK){
        printf("error!");
        } else {
                printf("device opened!\n");
        }

    DEVICEINFO testdi;
    ret = SDF_GetDeviceInfo(pdh, &testdi);
        if(ret != SDR_OK){
        printf("error!");
        } else {
        printf("Issuer Name: %s\n", testdi.IssuerName);
        printf("Device Name: %s\n", testdi.DeviceName);
        printf("Device Serial: %s\n", testdi.DeviceSerial);
        printf("Device Version: %d\n", testdi.DeviceVersion);
        }
unsigned int n;
   unsigned char pRandom[10017];
        scanf("%d", &n);
   ret = SDF_GenerateRandom(*pdh, n, pRandom);
        if(ret != SDR_OK){
        printf("error!");
        } else {
        for(int i=0; i<n; i++)
            printf("%02x", pRandom[i]);
        }
        printf("\n");

    ret = SDF_CloseDevice(*pdh);

        if(ret != SDR_OK){
        printf("error!");
        } else {
                free(pdh);
                printf("device closed!\n");
        }

        return 0;
}