我的C一般，前段时间写了个加密字符串的函数，有问题，先来请教了再说：
问题是，Src为中文时会出现错误，请教为什么？如何改正？
char dest[30], tmp[2];
char * EncrypKey (char * Src,char * k)
{
int KeyLen, KeyPos, offset, SrcPos, SrcAsc, Range, i;
char *p;
for(i=0;i<30;i++) dest = 0;
//初始化
if (strlen(Src) == 0) return dest;
p = Src;
if(strlen(k) == 0) k = "Think Space";
KeyLen = strlen(k);
KeyPos = -1;
Range = 256;
offset = Random(Range);
sprintf(tmp, "%1.2x", offset);
strcat(dest, tmp);
while (p[0] != 0)
{
SrcAsc = (p[0] + offset) % 255;
KeyPos = (KeyPos < KeyLen -1)? KeyPos + 1 : 0;
sprintf(tmp, "%1.2x", SrcAsc ^ k[KeyPos]);
strcat(dest, tmp);
offset = SrcAsc;
p++;
}
return dest;
}
