main.c

可以在ARM7-embest的板子上运行的DES加解密算法

/*********************************************************************************************
* File：	main.c
* Author:	embest
* Desc：	c main entry
* History:	
*********************************************************************************************/
#include "44blib.h"
#include "44b.h"
#include <string.h>

void des(char *source,char *dest,char * inkey, int flg);

int Main(){
		
	char 	szLogo[17] = "Embest S3CEV40 >";
    char    key[256]={0};
    char	source[1024]={0};
    int 	i,cnt,k;
	char 	s[9]={0};
	char 	d[9]={0};//65的原因是一个存放\0
	char 	destination[1024]={0};
	char 	*s_ptr;
	int 	flag;
	i=cnt=0;
	rSYSCFG=CACHECFG;// Using 8KB Cache//
	Port_Init();
	Uart_Init(0,115200);
	Uart_Select(0); //Select UART0//
	// printf interface
	Uart_Printf("\n");
	Uart_Printf(szLogo);
	Uart_Printf("\n");
	Uart_Printf("Please input flag to detemine encryption or decryption:");
	flag=Uart_GetIntNum();
	//Uart_Printf("\n");
	Uart_Printf("Please input key:");
	Uart_GetString(key);
	//Uart_Printf("\n");
	Uart_Printf("Please input source:");
	Uart_GetString(source);
	//Uart_Printf("\n");
//*************************
	if(flag==0){
		k=0;
		s_ptr=source;
		//printf("******up loop start****\n");
		while(*s_ptr){
		cnt=0;
		//printf("******down loop start****\n");
		while(*s_ptr&&cnt<8){
			s[cnt]=*s_ptr;
			s_ptr++;
			cnt++;
				}
		//printf("******if start****\n");
		if((7-cnt)>0){
			for(i=cnt;i<8;i++)
				s[i]=32;
			}
		Uart_Printf("Len=%d\n",strlen(s));	
		for(i=0;i<strlen(s);i++)
		    Uart_Printf("%c",s[i]);
		Uart_Printf("-----printf s end!\n");
		Uart_Printf("des start!\n");
    	des(s,d,key,flag);//flag=0表示；加密对单个字节加密
		Uart_Printf("8字节加密结束!\n");
		Uart_Printf("Length=%d\n",strlen(d));
		for(i=0;i<strlen(d);i++){
			destination[k++]=d[i];
			Uart_Printf("%c",d[i]);
			}
		Uart_Printf("\nprintf d end!\n");
		memset(d,0,8);
		//Uart_Printf("\n");
		}
		Uart_Printf("if end!");
	}
	else {
		k=0;
		s_ptr=source;
		//printf("******up loop start****\n");
		while(*s_ptr){
			cnt=0;
			//printf("******down loop start****\n");
			while(*s_ptr&&cnt<8){
			s[cnt]=*s_ptr;
			s_ptr++;
			cnt++;
				}
			//printf("******if start****\n");
			/*if((7-cnt)>0){
			for(i=7-cnt;i<8;i++)
				s[i]=32;
				}*/
			Uart_Printf("Len=%d\n",strlen(s));
			for(i=0;i<strlen(s);i++)
			Uart_Printf("%c",s[i]);
			Uart_Printf("printf s end!\n");
			Uart_Printf("des start!\n");
    			des(s,d,key,flag);//flag=1表示；加密对单个字节解密
			Uart_Printf("8字节解密结束！");
			Uart_Printf("\n");
			Uart_Printf("Length=%d",strlen(d));
			Uart_Printf("\n");
			for(i=0;i<8;i++){
			destination[k++]=d[i];
			Uart_Printf("%c",d[i]);
			}
			Uart_Printf("printf d end!\n");
			//Uart_Printf("\n");
		}
		Uart_Printf("\n");
		Uart_Printf("else end!");
	}
	
Uart_Printf("加密|解密成功!!!");
return 0;
}