mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-19 03:25:38 -04:00
51b0ff6627
Adds the old card loader bootloader in a manner similar to how slot1Launcher works in TwilightMenu. The new ini file setting has NTR_Launcher use the previous build of the the cart loader that doesn't have TWL cart support. This version had better compatiblity with old flashcarts. Use legacy mode if you had to use an old build of NTR_Launcher to use your flashcart. Note that legacy mode setting is overridden if you attempt to boot a TWL cart so you don't have to disable it in the ini file anytime you want to try booting a TWL cart.
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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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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