一个简单的字符串加密程序

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//一个简单的字符串加密程序

#include <stdio.h>#include <string.h> #define LODWORD(_qw) ((unsigned long)(_qw))#define HIDWORD(_qw) ((unsigned long)(((_qw) >> 32) & 0xffffffff)) char *pkey = "www.oschina.net";char *keymap = "abcdefghijklmnopqrstuvwxyz"; void encrypt(char *username, char *key){    int i;    unsigned __int64 v6;    unsigned __int64 tmp;    int nameLen = strlen(username);    for ( i = 0; i != nameLen; ++i )    {        tmp = (keymap[i] * username[i] ^ 0x28FC) & 0xFFFFFFF;        v6 = LODWORD(tmp);        tmp = (unsigned int)keymap[i] * (unsigned __int64)(unsigned int)username[i] >> 32;        v6 += HIDWORD(tmp);        key[i] = pkey[v6 % 0xF];        key[i + 1] = 0;    }}  int main(int argc, char* argv[]){    char *name = "luobotou";    char key[64] = {0};    encrypt(name, key);    printf("name:%s\nkey:%s \n", name, key);    getchar();    return 0;}

转载地址：http://www.oschina.net/code/snippet_583625_18718

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