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Unknown Hex Values for Current Clip Ammo?

 
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Osedax
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Joined: 19 Jul 2016
Posts: 14

PostPosted: Sat Jun 30, 2018 9:20 pm    Post subject: Unknown Hex Values for Current Clip Ammo? Reply with quote

I'm using CE on a game and for Clip Ammo it's displaying the values oddly. Not sure how the game is converting the values to the correct in-game values :/

For my Sniper I have 12 shots per clip, these are the values CE is displaying:

AMMO:DECIMAL- HEX
12:21894 - 5586
11:21889 - 5581
10:21888 - 5580
9:21891 - 5583
8:21890 - 5582
7:21901 - 558D
6:21900 - 558C
5:21903 - 558F
4:21902 - 558E
3:21897 - 5589
2:21896 - 5588
1:21899 - 558B
0:21898 - 558A

Anyone know how these values can equal what they do in-game?
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ParkourPenguin
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PostPosted: Sat Jun 30, 2018 9:57 pm    Post subject: Reply with quote

Looks like a standard xor cipher. Key = 0x558A.
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Osedax
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PostPosted: Sat Jun 30, 2018 10:04 pm    Post subject: Reply with quote

ParkourPenguin wrote:
Looks like a standard xor cipher. Key = 0x558A.


Do you know how I'd decrypt it? I found the XOR info in CE:

imgur*com/gZ9vFfI
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ParkourPenguin
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PostPosted: Sat Jun 30, 2018 11:10 pm    Post subject: Reply with quote

xor the encrypted/decrypted value to get the other.
Code:
12 ~ 0x558A = 21894
21894 ~ 0x558A = 12

Here's a custom type that should work:
Code:
alloc(ConvertRoutine,1024)
alloc(ConvertBackRoutine,1024)
alloc(TypeName,256)
alloc(ByteSize,4)
alloc(UsesFloat,1)
alloc(CallMethod,1)

TypeName:
  db 'word xor cipher 558a',0
ByteSize:
  dd 2
UsesFloat:
  db 0
CallMethod:
  db 1

// cdecl int ConvertRoutine(unsigned char *input, PTR_UINT address);
ConvertRoutine:
[64-bit]
  movzx eax,word ptr[rcx]
[/64-bit]
[32-bit]
  mov eax,[esp+4]
  movzx eax,word ptr[eax]
[/32-bit]
  xor ax,558a
  ret

// cdecl void ConvertBackRoutine(int i, PTR_UINT address, unsigned char *output);
ConvertBackRoutine:
[64-bit]
  xor cx,558a
  mov [r8],cx
[/64-bit]
[32-bit]
  movzx eax,word ptr[esp+4]
  mov edx,[esp+C]
  xor ax,558a
  mov word ptr[edx],ax
[/32-bit]
  ret

Right click the "Value type" drop down list, select "Define new custom type (Auto Assembler)", delete everything, and copy/paste the above code into there.

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Osedax
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Joined: 19 Jul 2016
Posts: 14

PostPosted: Sat Jun 30, 2018 11:30 pm    Post subject: Reply with quote

ParkourPenguin wrote:
xor the encrypted/decrypted value to get the other.
Code:
12 ~ 0x558A = 21894
21894 ~ 0x558A = 12

Here's a custom type that should work:
Code:
alloc(ConvertRoutine,1024)
alloc(ConvertBackRoutine,1024)
alloc(TypeName,256)
alloc(ByteSize,4)
alloc(UsesFloat,1)
alloc(CallMethod,1)

TypeName:
  db 'word xor cipher 558a',0
ByteSize:
  dd 2
UsesFloat:
  db 0
CallMethod:
  db 1

// cdecl int ConvertRoutine(unsigned char *input, PTR_UINT address);
ConvertRoutine:
[64-bit]
  movzx eax,word ptr[rcx]
[/64-bit]
[32-bit]
  mov eax,[esp+4]
  movzx eax,word ptr[eax]
[/32-bit]
  xor ax,558a
  ret

// cdecl void ConvertBackRoutine(int i, PTR_UINT address, unsigned char *output);
ConvertBackRoutine:
[64-bit]
  xor cx,558a
  mov [r8],cx
[/64-bit]
[32-bit]
  movzx eax,word ptr[esp+4]
  mov edx,[esp+C]
  xor ax,558a
  mov word ptr[edx],ax
[/32-bit]
  ret

Right click the "Value type" drop down list, select "Define new custom type (Auto Assembler)", delete everything, and copy/paste the above code into there.


Thanks that worked perfectly Very Happy
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