str2hex.cpp

来自「网上唯一一个支持中文加解密的1024位快速RSA算法源码」· C++ 代码 · 共 161 行

#include"E:\code\head\Pause.h"

#ifndef OUT
#define OUT
#endif

#ifndef IN 
#define IN
#endif 
/*
    string-> hex string
call way:
    Str2Hex("yao",3,char ss[]);//here!sizeof(ss)>=2*strlen("adsdff")
Return:
    ss[]="79616F"    
Author: Red Sun
*/
void Str2Hex(IN  const char* Str,
             IN  int         Strlen,    
             OUT char* pHex
              )
{

   int  len =Strlen;
   int i=0,j=0,ascii=0;
   int highBit=0,lowBit=0;//十位数，个位数 
   CString s;             //不知道要不要释放s内存。。。 
   
   //倍2，因为转换出来的pHex 长度是以前字符串的两倍 
   memset(pHex, '\0', 2*sizeof(_TCHAR)*(len)); 

   for( i=0,j=0; i< len; ++i,j+=2 )
   {
       //如tmp[0]='y',对应的ASCII为0x79 
       //then result[0]='7' result[1]='9'
       highBit = (Str[i]&0x000000ff)>>4; //除以十六，得到高位数7
       lowBit  = (Str[i]&0x0000000f);    //得到低位0~0xf 
	   s.Format("tmp[%d]=%x ",i,(Str[i]&0x000000ff));
	   
MessageBox(0,&Str[i],s,MB_OK);

       //高位在前，先处理高位 
       if( highBit>=0 && highBit<=9 )
       {
           pHex[j] = highBit + ('0'-0x0);  //将0x0~0x9,转化为'0'~'9'  
           
       }else if( highBit>=0xa && highBit <= 0xf )
       {
           pHex[j] = highBit + ('a'-0xa); //将0xa~0xf,转化为'a'~'f'      
       }else
       {
           pHex[j] =0;     
       }
       
       //低位在后，处理低位       
       if( lowBit>=0 && lowBit<=9 )
       {
           pHex[j+1] = lowBit + ('0'-0x0);    
           
       }else if( lowBit>=0xa && lowBit <= 0xf )
       {
           pHex[j+1] = lowBit + ('a'-0xa);       
       }else
       {
           pHex[j+1] =0;     
       }

       printf("%x%x ",pHex[j],pHex[j+1]);
   }//for
   pHex[j-2]='\0';
   pHex[j-1]='\0';//这两句必须加上，否则打印字符串时会有小尾巴 

   return ;
} 

/*
    hex  string->string
call way:
    Hex2Str("79616F",6，char ss[]);//here!sizeof(ss)=strlen("adsdff")/2
Return:
    ss[]='yao'
Author: Red Sun
*/
void Hex2Str(IN  const char* pHex,
             IN  int   pHexlen,    
             OUT char* Str
              )
{

   int len = pHexlen;
   int i=0,j=0,ascii=0;
   int highBit=0,lowBit=0;//十位数，个位数 
   printf("len:%d\n",len);
   //MessageBox(0,pHex,0,MB_OK);

   for( i=0,j=0; i< len; ++j,i+=2 )
   {
       //如pHex[0]='6',pHex[1]='f' 转化成0x6f -> 对应的字符为'o' 
       //then Str[0]=0x6f--->'o'
       
       //先计算Str[i]高位 
       if( pHex[i]>='0' && pHex[i] <='9')
       {
            highBit = pHex[i] -'0';       //'0'~'9' ----> 0~9 
       }else if( pHex[i]>='a' && pHex[i]<='f' )
       {
            highBit = pHex[i] -'a' +0xa;  //'a'~'f'---->0xa~0xf    
       }
       else if( pHex[i] >='A' && pHex[i]<='F')
       {
            highBit = pHex[i] -'A' +0xa;  //'A'~'F'------>0xa~0xf   
       }else
       {
            highBit =0;     
       }
       
       //计算字符Str[i]对应的十六进制的低位 
       if( pHex[i+1]>='0' && pHex[i+1] <='9')
       {
            lowBit = pHex[i+1] -'0';      //'0'~'9' ----> 0~9 
       }else if( pHex[i+1]>='a' && pHex[i+1]<='f' )
       {
            lowBit = pHex[i+1] -'a' +0xa; //'a'~'f'---->0xa~0xf      
       }
       else if( pHex[i+1] >='A' && pHex[i+1]<='F')
       {
            lowBit = pHex[i+1] -'A' +0xa; //'a'~'f'---->0xa~0xf     
       }else
       {
            lowBit =0;     
       }

       Str[j]  = (highBit<<4) + lowBit;//不能写成highBit<<4+lowBit; 
       
   }//for
   Str[j-1]='\0';//这句必须加上，否则打印字符串时会有小尾巴 
   return ;
} 
/*
 
int main(IN int argc, IN char* argv[])
{
  
   char* str="yaolixing",pHex[50]={'\0'};
   char* q=0;
   char* p=Str2Hex(str,pHex);
   printf("\n");
   for(int i=0;i< strlen(str)*2; i+=2)
   printf("%x%x  ",pHex[i]-'0',pHex[i+1]-'0');

   printf("Hex2Str:%s\n",pHex);
   q=Hex2Str(pHex,p);
   printf("\nq=%s\n",q);
   free(q);
   
   free(p);
   Pause();
   return 0;    
    
}*/