//将字节转换成二进制输出
std::string ToBinaryString(const unsigned char* buf,int len)
{
int output_len = len*8;
std::string output;
const char* m[] = {"0","1"};
for(int i = output_len - 1,j = 0; i >=0 ; --i,++j)
{
output.append(m[((unsigned char)buf[j/8] >> (i % 8)) & 0x01],1);
}
return output;
}
//将十六进制数字字符串转成字节
int ConvertHexToBin(char *hexkey, unsigned char *key, int *keylen)
{
char *cp, ch;
int i = 0, by = 0;
cp = hexkey; // this is a pointer to the hexadecimal key digits
while(*cp)
{
ch = toupper(*cp++); // process a hexadecimal digit
if(ch >= '0' && ch <= '9')
by = (by << 4) + ch - '0';
else if(ch >= 'A' && ch <= 'F')
by = (by << 4) + ch - 'A' + 10;
else // error if not hexadecimal
return 0;
// store a key byte for each pair of hexadecimal digits
if(i++ & 1)
key[i / 2 - 1] = by & 0xff;
}
*keylen = i / 2;
return 1;
}
//将字节转成十六进制数字字符串
int ConvertBinToHex(unsigned char *key, int keylen, char *hexkey)
{
int i=0;
if(hexkey == NULL)
return 0;
for(i=0; i<keylen; i++)
sprintf(hexkey+i*2, "%02X", key[i]);
return 1;
}