mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-18 19:15:40 -04:00
1e2dfed554
This is the version 1.9.6 build rebased from Chishm's official github of NitroHax which is the project this is based off of.
112 lines
2.7 KiB
C
Executable File
112 lines
2.7 KiB
C
Executable File
/*
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NitroHax -- Cheat tool for the Nintendo DS
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Copyright (C) 2008 Michael "Chishm" Chisholm
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "encryption.h"
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#include "read_bios.h"
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#include "key1.h"
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#define KEYSIZE 0x1048
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static u32 keycode [3];
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static u32 keybuf [KEYSIZE/sizeof(u32)];
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void crypt_64bit_up (u32* ptr) {
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u32 x = ptr[1];
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u32 y = ptr[0];
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u32 z;
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int i;
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for (i = 0; i < 0x10; i++) {
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z = keybuf[i] ^ x;
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x = keybuf[0x012 + ((z>>24)&0xff)];
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x = keybuf[0x112 + ((z>>16)&0xff)] + x;
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x = keybuf[0x212 + ((z>> 8)&0xff)] ^ x;
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x = keybuf[0x312 + ((z>> 0)&0xff)] + x;
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x = y ^ x;
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y = z;
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}
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ptr[0] = x ^ keybuf[0x10];
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ptr[1] = y ^ keybuf[0x11];
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}
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void crypt_64bit_down (u32* ptr) {
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u32 x = ptr[1];
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u32 y = ptr[0];
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u32 z;
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int i;
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for (i = 0x11; i > 0x01; i--) {
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z = keybuf[i] ^ x;
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x = keybuf[0x012 + ((z>>24)&0xff)];
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x = keybuf[0x112 + ((z>>16)&0xff)] + x;
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x = keybuf[0x212 + ((z>> 8)&0xff)] ^ x;
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x = keybuf[0x312 + ((z>> 0)&0xff)] + x;
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x = y ^ x;
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y = z;
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}
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ptr[0] = x ^ keybuf[0x01];
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ptr[1] = y ^ keybuf[0x00];
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}
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static u32 bswap_32bit (u32 in) {
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u8 a,b,c,d;
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a = (u8)((in >> 0) & 0xff);
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b = (u8)((in >> 8) & 0xff);
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c = (u8)((in >> 16) & 0xff);
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d = (u8)((in >> 24) & 0xff);
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u32 out = (a << 24) | (b << 16) | (c << 8) | (d << 0);
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return out;
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}
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void apply_keycode (u32 modulo) {
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u32 scratch[2];
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int i;
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modulo = modulo / sizeof(*keycode);
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crypt_64bit_up (&keycode[1]);
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crypt_64bit_up (&keycode[0]);
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memset (scratch, 0, 8);
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for (i = 0; i < 0x12; i+=1) {
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keybuf[i] = keybuf[i] ^ bswap_32bit (keycode[i % modulo]);
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}
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for (i = 0; i < 0x412; i+=2) {
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crypt_64bit_up (scratch);
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keybuf[i] = scratch[1];
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keybuf[i+1] = scratch[0];
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}
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}
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void init_keycode (u32 idcode, u32 level, u32 modulo) {
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memcpy ((u8*)keybuf, gEncrData, KEYSIZE);
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keycode[0] = idcode;
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keycode[1] = idcode/2;
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keycode[2] = idcode*2;
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if (level >= 1) apply_keycode (modulo); // first apply (always)
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if (level >= 2) apply_keycode (modulo); // second apply (optional)
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keycode[1] = keycode[1] * 2;
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keycode[2] = keycode[2] / 2;
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if (level >= 3) apply_keycode (modulo); // third apply (optional)
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}
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