Function at 0x403b90
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
push ebp
mov ebp, esp
push 0xffffffffffffffff
push 0x4b35e8
mov eax, dword fs:[0]
push eax
mov dword fs:[0], esp
sub esp, 0x10
mov eax, ecx
mov ecx, dword [ebp + 0x14]
push ebx
push esi
xor bl, bl
mov dword [ebp - 0x14], eax
mov esi, dword [eax + 0x14]
push edi
mov dword [ebp - 0x10], esi
mov edi, dword [esi + 8]
cmp ecx, dword [eax + 0x10]
jb 0x403d98
mov ecx, dword [ebp + 0xc]
cmp dword [eax + 0xc], ecx
jne 0x403d98
mov esi, dword [ebp + 8]
mov edx, ecx
or ecx, 0xffffffff
mov dword [ebp - 0x18], esi
mov esi, dword [ebp - 0x10]
test edx, edx
je 0x403c10
mov esi, dword [ebp - 0x18]
nop dword [eax + eax]
movzx eax, byte [esi]
lea esi, [esi + 1]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4ced00]
sub edx, 1
jne 0x403bf0
mov esi, dword [ebp - 0x10]
mov eax, dword [ebp - 0x14]
not ecx
cmp dword [eax + 8], ecx
jne 0x403d98
mov eax, dword [eax + 4]
cmp eax, 0x50445342
jg 0x403ce0
je 0x403c42
cmp eax, 0x30445342
je 0x403c42
cmp eax, 0x474f5043
je 0x403cf2
jmp 0x403d98
mov ebx, dword [esi]
cmp edi, ebx
jbe 0x403c5e
mov ecx, dword [esi + 0x10]
mov eax, edi
sub eax, ebx
push eax
mov eax, dword [esi + 4]
mov edx, dword [ecx]
add eax, ebx
push eax
push ebx
call dword [edx + 8]
mov dword [esi], edi
mov ecx, dword [esi + 4]
cmp edi, 0x20
jb 0x403d96
mov al, byte [ecx + 3]
cmp al, 4
jne 0x403cb7
lea eax, [edi - 0x18]
add ecx, 0x18
push 0x18
lea edx, [ebp - 0x10]
mov dword [ebp - 0x10], eax
call fcn.004033e0
push dword [ebp + 0xc]
mov edx, dword [ebp - 0x10]
mov esi, eax
push dword [ebp + 8]
mov ecx, esi
push dword [ebp + 0x14]
push dword [ebp + 0x10]
call fcn.00403210
add esp, 0x14
xor edx, edx
mov ecx, esi
mov bl, al
push 0
sub esp, 8
call fcn.00434480
add esp, 0xc
jmp 0x403d98
cmp al, 2
jne 0x403d96
push dword [ebp + 0xc]
lea edx, [edi - 0x18]
add ecx, 0x18
push dword [ebp + 8]
push dword [ebp + 0x14]
push dword [ebp + 0x10]
call fcn.00403210
add esp, 0x10
mov bl, al
jmp 0x403d98
cmp eax, 0x50554f43
je 0x403d37
cmp eax, 0x59504f43
jne 0x403d98
mov ecx, dword [ebp - 0x14]
lea edx, [ebp + 0xc]
push edx
mov dword [ebp + 0xc], 0
mov eax, dword [ecx]
call dword [eax + 0x14]
mov edx, dword [ebp + 0xc]
mov esi, dword [ebp + 0x10]
lea ecx, [edx + eax]
cmp esi, ecx
jae 0x403d28
lea ecx, [edx + esi]
cmp ecx, eax
jbe 0x403d28
push edx
push eax
push esi
call fcn.0048a330
add esp, 0xc
mov bl, 1
jmp 0x403d98
push edx
push eax
push esi
call fcn.00488cb0
add esp, 0xc
mov bl, 1
jmp 0x403d98
mov ebx, dword [esi]
cmp edi, ebx
jbe 0x403d53
mov ecx, dword [esi + 0x10]
mov eax, edi
sub eax, ebx
push eax
mov eax, dword [esi + 4]
mov edx, dword [ecx]
add eax, ebx
push eax
push ebx
call dword [edx + 8]
mov dword [esi], edi
mov ecx, 0x4e9108
mov dword [ebp - 0x1c], 0x4e9108
call fcn.00432940
mov dword [ebp - 0x18], eax
mov dword [ebp - 4], 0
cmp eax, 1
jne 0x403d8c
push 0
push 0x4c87fe
push str.Courgette_support_isnt_included_in_this_build__please_recompile_with_Courgette_support_enabled.
push str.false
call fcn.0042d5c0
add esp, 0x10
mov ecx, 0x4e9108
call fcn.00432950
xor bl, bl
mov ecx, dword [ebp - 0xc]
mov al, bl
pop edi
pop esi
pop ebx
mov dword fs:[0], ecx
mov esp, ebp
pop ebp
ret 0x10