本文以代码的方式描述如何调用TPM生成随机数。

编译方式

gcc -Wall -Wextra -std=c99 -g xxx.c -o xxx

1.头文件

#ifndef _ELTT2_H_
#define _ELTT2_H_
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
//-------------"Defines"-------------
#define ERR_COMMUNICATION		-1	///< Return error check for read and write to the TPM.
#define PRINT_RESPONSE_WITHOUT_HEADER		12	///< Prints the response buffer from byte 12.
static const uint8_t tpm2_getrandom[] = {
	0x80, 0x01,			// TPM_ST_NO_SESSIONS
	0x00, 0x00, 0x00, 0x0C,		// commandSize
	0x00, 0x00, 0x01, 0x7B,		// TPM_CC_GetRandom
	0x00, 0x00			// bytesRequested (will be set later)
};
#endif /* _ELTT2_H_ */

2.具体源文件

#include "eltt2.h"
#include <unistd.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <pthread.h>
#include <sys/time.h>
#include <stdlib.h>
#include <stdint.h>

int dev_tpm = -1;
unsigned char *path = "/dev/tpm0";
int mode = O_RDWR;
int tpm_test()
{
	int ret_val = EXIT_SUCCESS;	
	int dev_tpm = -1;		// TPM device handle.
	ssize_t transmit_size = 0;	// Amount of bytes sent to / received from the TPM.
	uint8_t send_buf[1024];
	uint8_t response[1024];
	int send_buf_lenth = 0;
	int i;
	memset(response, 0, 1024);
	memset(send_buf, 0, 1024);

	send_buf_lenth = sizeof(tpm2_getrandom);
	memcpy(send_buf, tpm2_getrandom, sizeof(tpm2_getrandom));
	send_buf[sizeof(tpm2_getrandom) - 1] = 32;
	dev_tpm = open("/dev/tpm0", O_RDWR);
	if (dev_tpm < 0){
		printf("open errorn");
			return 0;
	}
	
	// Send request data to TPM.
	transmit_size = write(dev_tpm, send_buf, send_buf_lenth);
	if (transmit_size == ERR_COMMUNICATION || send_buf_lenth != transmit_size)
	{
		//ret_val = errno;
		fprintf(stderr, "Error sending request to TPM.n");
		return 0;
	}

	// Read the TPM response header.
	transmit_size = read(dev_tpm, response, 1024);
	if (transmit_size == ERR_COMMUNICATION)
	{
		//ret_val = errno;
		fprintf(stderr, "Error reading response from TPM.n");
		return 0;
	}	
	if (-1 != dev_tpm)
	{		
		close(dev_tpm);	
	}
	return ret_val;
}

最后

以上就是辛勤小天鹅为你收集整理的调用TPM生成随机数1.头文件2.具体源文件的全部内容，希望文章能够帮你解决调用TPM生成随机数1.头文件2.具体源文件所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。