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decode.c
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executable file
·174 lines (143 loc) · 3.46 KB
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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void decode196(char *str);
void decode200(char *str);
void Rnd();
void copy(char *s, char *s1, int len);
struct RandomNext {
double result;
unsigned int next;
} s_rand;
void main(int argc, char **argv)
{
if (argv[1] == NULL || strlen(argv[1]) < 5){
printf("N点虚拟主机解密工具1.0 \n支持1.9和2.0版本 by M\n用法:N_Decode.exe pass \n");
exit(0);
}
else if (strlen(argv[1]) > 0x300){
printf("Fail!\n");
exit(0);
}
else if (strstr(argv[1], "@") && strlen(argv[1]) > 26){
char * str = *(argv + 1) + 26; /* 截取字符串 */
decode196(str);
}
else{
decode200(argv[1]);
}
}
void decode196(char *str){
int tmp, tmp2, str_len = strlen(str), str_len2 = str_len / 2;
int *pass1 = (int *)calloc(str_len2, sizeof(int));
char *result = (char *)calloc(str_len2, sizeof(char));
int div = 0xD, FLAG = 0;
int MOD = 0;
for (int i = 0; i < str_len2; i++){
tmp = (*(str++) - 0x40) * 0x10;
FLAG = 0;
if (!(tmp >= 0xFF)){
tmp = (tmp >> 4); /* 取位； */
FLAG = 1;
}
tmp2 = *(str++) & 0x0F; /* 取位 */
if (FLAG)
pass1[i] = tmp * 0x10 + tmp2;
else
pass1[i] = tmp + tmp2;
}
MOD = *(pass1 + str_len2 - 1); /* 最后一位 */
for (int i = str_len2 - 2; 0 <= i; i--){
tmp = *(pass1 + i) + (MOD * 0x100);
*(pass1 + i) = tmp / div;
MOD = tmp % div;
//printf("%02X,%02X,%02X\n", tmp, MOD, *(pass1 + i));
}
s_rand.next = 0x0805E86;
for (int i = 0; i < str_len2 - 1; i++){
tmp = pass1[i];
if (tmp < 0x20 || tmp > 0x7e ){
printf("Fail!\n");
exit(0);
/* #不是字母 */
}
Rnd(); /* 取数据； */
tmp -= 0x20;
tmp2 = (int)(s_rand.result * 96.0);
tmp2 = tmp - tmp2;
if ((tmp2 & 0xFFFF)>0x7FFF){
tmp2 += 0X5F;
}
tmp2 += 0X20;
result[i] = tmp2;
}
char **pass2 = (char **)calloc(3, sizeof(char**));
pass2[0] = strtok(result, "@");
if (strlen(pass2[0]) == str_len2 - 1){
printf("Fail!\n");
exit(0);
}
pass2[1] = strtok(NULL, "@");
pass2[2] = strtok(NULL, "@");
printf("\nPassword[*]:");
for (int i = 0; i < atoi(*(pass2 + 2)) * 2; i++, i++){
printf("%c", pass2[1][i]);
}
printf("\n");
free(pass2);
}
void decode200(char *str){
int passlen = strlen(str) - 6;
if (!passlen){
printf("\nPassword[*]:NULL");
exit(0);
}
*(str + passlen) = 0x00;
int div = strtol(str + passlen - 3, NULL, 16);
if (!div){
printf("Fail!\n");
exit(0);
}
char *find = str + passlen - 3;
char *szBuf = (char *)calloc(4, sizeof(char));
copy(szBuf, str + 4, 3);
if (strtol(szBuf, NULL, 16) != div){
printf("Fail!\n");
exit(0);
}
char *len = NULL;
int len1 = 0;
printf("\nPassword[*]:");
for (int i = 0; i < (passlen); i += 3){
len = strstr(str + i, find);
if (len){
len1 = len - (str + i);
copy(szBuf, str + i, len1);
i += len1;
len1 = strtol(szBuf, NULL, 16);
if (!len1)
break;
printf("%c", (char)(len1 / div));
}
else{
break;
}
}
free(szBuf);
}
void Rnd(){
unsigned int _ecx = 0x2bc03 * s_rand.next;
unsigned int _eax = 0xFFC39EC3;
unsigned int _edx = 0X00FFFFFF;
_eax -= _ecx;
_eax &= _edx;
s_rand.result = (double)_eax * 5.960464E-08;
s_rand.next = _eax;
}
void copy(char *s, char *s1, int len){
for (int i = 0; i < (int)strlen(s); i++)
*(s + i) = 0x0;
for (int i = 0; i < len; i++)
*(s + i) = *(s1 + i);
}