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Savedata Structure on 2.0+ Games

 
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shell



Joined: 03 Apr 2007
Posts: 7
Location: NYC
PostPosted: Tue Apr 03, 2007 6:18 am    Post subject: Savedata Structure on 2.0+ Games Reply with quote
Put simply, I want to make a program which can modify various traits and attributes of the Syphon Filter savedata. Before you flame me I have read up at jimparis's thread and plan to borrow some code from that sample (with credit). However, I have also read at some other thread that this code does not function on 3.0+. Is this true? What if the program is run on 3.03 OE-C with the 1.50 kernel option for homebrew? Also, how would I be able to extract the gamekey from the game ISO?

Thanks,
Shell
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shell



Joined: 03 Apr 2007
Posts: 7
Location: NYC
PostPosted: Tue Apr 03, 2007 7:06 am    Post subject: Reply with quote
I have made a rough, unchecked, uncompiled draft. First I consolidated encrypt.c, decrypt.c, hash.c and psf.c into one large file called cryptfuncs.h. I know that this does not delete the temporary DEC.BIN in the memory stick root but I want to keep it like that until release so I can do debugging in the meanwhile after I get the things like the gamekey that I need to get this off the ground.

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>

#include "cryptfuncs.h"

PSP_MODULE_INFO("SyphonFilter Savegame Tweaker", 0, 1, 1);

#define printf pspDebugScreenPrintf

int exit_callback(int arg1, int arg2, void *common)
{
   sceKernelExitGame();
   return 0;
}

int CallbackThread(SceSize args, void *argp)
{
   int cbid;

   cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
   sceKernelRegiste\rExitCallback(cbid);

   sceKernelSleepThreadCB();

   return 0;
}

int SetupCallbacks(void)
{
   int thid = 0;

   thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
   if(thid >= 0) {
      sceKernelStartThread(thid, 0, 0);
   }

   return thid;
}

const char *temp_bin = "ms0:/DEC.BIN";
const char *prefix = "ms0:/PSP/SAVEDATA/UCUS98641"; // append save number (ex. 0000)
const unsigned char gamekey[] = { 0x00 }; // need to wait on this one.

int main(int argc, char *argv[])
{
   bool satisfied = false;
   int i = 0;
   char *savename = (char *)calloc(strlen(prefix) + 4 + strlen("/DATA.BIN") + 1, sizeof(char));
   char *sfoname = (char *)calloc(strlen(prefix) + 4 + strlen("/PARAM.SFO") + 1, sizeof(char));

   pspDebugScreenInit();
   SetupCallbacks();

   SceCtrlData pad;

   while(satisfied == false)
   {
      printf("SyphonFilter Savegame Tweaker\n\nSavegame #: %d\nPress Triangle to increase and X to decrease\nPress O when ready.\n", num);
      sceCtrlReadBufferPositive(&pad, 1);
      if(pad.Buttons & PSP_CTRL_TRIANGLE)
      {
         if(i < 9999)
         ++i;
      else if(pad.Buttons & PSP_CTRL_CROSS)
      {
         if(i > 0)
            --i;
      }
      else if(pad.Buttons & PSP_CTRL_CIRCLE)
         satisfied = true;
   }

   pspDebugScreenClear();

   sprintf(savename, "%s%.4d/DATA.BIN%c", prefix, i, NULL);
   sprintf(sfoname, "%s%.4d/PARAM.SFO%c", prefix, i, NULL);

   i = decrypt_file(temp_bin, savename, gamekey);
   
   if(i < 0)
   {
      printf("There was an error in decoding, (code %d)\n", i);
      pspDebugScreenClear();
      sceKernelSleepThread();
      return 0;
   }

   // do tweaking/editing of DEC.BIN here

   i = encrypt_file(temp_bin, savename, "DATA.BIN", sfoname, gamekey);

   if(i < 0)
   {
      printf("There was an error in encoding, (code %d)\n", i);
      pspDebugScreenClear();
      sceKernelSleepThread();
      return 0;
   }

   printf("Done.\n"

   pspDebugScreenClear();

   sceKernelSleepThread();

   return 0;
}
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shell



Joined: 03 Apr 2007
Posts: 7
Location: NYC
PostPosted: Tue Apr 03, 2007 12:37 pm    Post subject: Reply with quote
Come on people! It's been hours! Does anyone know how to get the gamekey from a ISO to use for decrypting saves?!?!
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TyRaNiD



Joined: 18 Jan 2004
Posts: 918
PostPosted: Tue Apr 03, 2007 3:45 pm    Post subject: Reply with quote
Decrypting saves it not something we support and surely it is up to you to find the key it isn't very difficult :)
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shell



Joined: 03 Apr 2007
Posts: 7
Location: NYC
PostPosted: Wed Apr 04, 2007 2:13 am    Post subject: Reply with quote
I tried this PRX which hooks a savedata function to get the key but the call that it hooks is broken in 3.0+. Could you key it for me?
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