试试 intel rng 随机数生成器

今天看蒙特卡罗方法，看到对随机数的质量蛮强调的，搜索了一下随机数生成器，注意到intel的 drng，下载了guide 跟着实验了一下。

Bull Mountain Software Implementation Guide

下载地址 https://software.intel/file/37157

Intel® Digital Random Number Generator (DRNG) Software Implementation Guide

地址：https://software.intel/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide/

还可以下个paper参考下：

基于Intel_RNG的真随机数生成器研究

地址：http://download.csdn/detail/deltatang/7202395

顺便贴一下如何检测 服务器是intel芯片以及如何判断是否支持RNG的代码：

文件 get_cpuid_v1_lix64.s

.intel_syntax noprefix
	.text
	.global get_cpuid_info_v1

get_cpuid_info_v1:
	mov r8, rdi # array addr
	mov r9, rsi # leaf
	mov r10, rdx # subleaf
	push rax
	push rbx
	push rcx
	push rdx
	mov eax, r9d
	mov ecx, r10d

	cpuid

	mov DWORD PTR [r8], eax
	mov DWORD PTR [r8+4], ebx
	mov DWORD PTR [r8+8], ecx
	mov DWORD PTR [r8+12], edx
	pop rdx
	pop rcx
	pop rbx
	pop rax
	ret 0

#get_cpuid_info_v1 ENDP
#_TEXT ENDS

文件：get_cpuid_v1_lix64.h

typedef struct {
	unsigned int EAX;
	unsigned int EBX;
	unsigned int ECX;
	unsigned int EDX;
} CPUIDinfo;

extern void get_cpuid_info_v1(CPUIDinfo *info, const unsigned int func, const unsigned int subfunc);

文件：rngchk.c

#include <stdio.h>
#include <stdlib.h>

#include "get_cpuid_v1_lix64.h"

void _CPUID(CPUIDinfo *info, const unsigned int func, const unsigned int subfunc)
{
	get_cpuid_info_v1(info, func, subfunc);
}

typedef unsigned int DWORD;

int _rdrand_check_support()
{
	CPUIDinfo info;
	int got_intel_cpu=0;

	_CPUID(&info, 0, 0);

	if(memcmp((char *)(&info.EBX), "Genu", 4) == 0 &&
		memcmp((char *)(&info.EDX), "ineI", 4) == 0 &&
		memcmp((char *)(&info.ECX), "ntel", 4) == 0) {
		got_intel_cpu = 1;
	}

	if (got_intel_cpu) {
		_CPUID(&info, 1, 0);
		if ((info.ECX & 0x40000000)==0x40000000) return 1;
	} else 
	{
		return 2;
	}

	return 0;
}

int main(int argc, char **argv) {
	int ret = _rdrand_check_support();
	printf("is not intel cpu?       [%c]\n", (ret == 2 ? 'Y' : 'N'));
	printf("is intel rng supported? [%c]\n", (ret == 1 ? 'Y' : 'N'));
}

然后执行：

gcc -g -c get_cpuid_v1_lix64.s -o get_cpuid_v1_lix64.o
gcc rngchk.c get_cpuid_v1_lix64.o -o rngchk

得到 rngchk 执行结果：

[root@localhost rng]# ./rngchk
is not intel cpu?       [N]
is intel rng supported? [N]

结果发现俺测试服务器不支持，好吧，先留着，以后再说吧：）