Function at 0x604b70
Capabilities:
Encode data using xor

Disassembly:
push ebp
mov ebp, esp
mov eax, 0x18
call fcn.006d13f0
cmp dword [ebp + 0x20], 0
mov eax, dword [ebp + 0x1c]
push ebx
push esi
push edi
mov esi, dword [eax]
je 0x604c93
mov ecx, dword [ebp + 8]
mov edi, dword [ebp + 0x10]
mov ebx, dword [ebp + 0xc]
mov dword [ebp + 0x20], ecx
test esi, esi
je 0x604bbe
mov edx, dword [ebp + 0x18]
test edi, edi
je 0x604bbe
movzx eax, byte [ecx]
dec edi
xor byte [esi + edx], al
inc ecx
movzx eax, byte [esi + edx]
inc esi
mov byte [ebx], al
inc ebx
mov dword [ebp + 0x20], ecx
and esi, 0xf
jne 0x604ba2
cmp edi, 0x10
jb 0x604c4a
mov edx, dword [ebp + 0x18]
mov eax, ebx
sub eax, edx
mov dword [ebp - 0x10], eax
mov eax, ecx
sub eax, edx
mov dword [ebp - 8], eax
mov eax, edi
shr eax, 4
mov dword [ebp - 0xc], eax
shl eax, 4
add ebx, eax
add ecx, eax
mov dword [ebp - 4], ebx
mov ebx, dword [ebp - 0x10]
mov dword [ebp + 0x20], ecx
jmp 0x604bf5
mov edx, dword [ebp + 0x18]
push dword [ebp + 0x14]
push edx
push edx
call dword [ebp + 0x24]
add esp, 0xc
cmp esi, 0x10
jae 0x604c35
mov ecx, dword [ebp + 0x18]
mov edx, 0xf
sub edx, esi
add ecx, esi
mov esi, dword [ebp - 8]
shr edx, 2
inc edx
nop dword [eax + eax]
mov eax, dword [esi + ecx]
lea ecx, [ecx + 4]
xor dword [ecx - 4], eax
mov eax, dword [ecx - 4]
mov dword [ebx + ecx - 4], eax
sub edx, 1
jne 0x604c20
add dword [ebp - 8], 0x10
sub edi, 0x10
add ebx, 0x10
xor esi, esi
sub dword [ebp - 0xc], 1
jne 0x604bf2
mov ebx, dword [ebp - 4]
test edi, edi
je 0x604dbd
push dword [ebp + 0x14]
mov eax, dword [ebp + 0x18]
push eax
push eax
call dword [ebp + 0x24]
mov eax, dword [ebp + 0x18]
add esp, 0xc
mov edx, dword [ebp + 0x20]
sub ebx, eax
sub edx, eax
lea ecx, [esi + eax]
add esi, edi
nop
movzx eax, byte [ecx + edx]
lea ecx, [ecx + 1]
xor byte [ecx - 1], al
movzx eax, byte [ecx - 1]
mov byte [ecx + ebx - 1], al
sub edi, 1
jne 0x604c70
mov eax, dword [ebp + 0x1c]
pop edi
mov dword [eax], esi
pop esi
pop ebx
mov esp, ebp
pop ebp
ret
mov ebx, dword [ebp + 0x10]
mov edi, dword [ebp + 0xc]
mov dword [ebp - 8], ebx
mov dword [ebp - 4], edi
test esi, esi
je 0x604cd7
mov edx, dword [ebp + 8]
mov eax, dword [ebp + 0x18]
mov dword [ebp + 0x20], edx
nop dword [eax]
test ebx, ebx
je 0x604cdd
mov al, byte [esi + eax]
dec ebx
mov cl, byte [edx]
inc edx
xor al, cl
mov dword [ebp + 0x20], edx
mov byte [edi], al
inc edi
mov eax, dword [ebp + 0x18]
mov dword [ebp - 4], edi
mov dword [ebp - 8], ebx
mov byte [esi + eax], cl
inc esi
and esi, 0xf
jne 0x604cb0
jmp 0x604cdd
mov eax, dword [ebp + 8]
mov dword [ebp + 0x20], eax
mov edx, dword [ebp + 0x24]
cmp ebx, 0x10
jb 0x604d72
mov ecx, dword [ebp + 0x18]
mov eax, edi
sub eax, ecx
mov dword [ebp - 0xc], eax
mov eax, ebx
shr eax, 4
mov dword [ebp - 0x10], eax
jmp 0x604d03
mov ecx, dword [ebp + 0x18]
push dword [ebp + 0x14]
push ecx
push ecx
call edx
add esp, 0xc
cmp esi, 0x10
jae 0x604d53
mov edi, dword [ebp + 0x18]
mov eax, 0xf
mov edx, dword [ebp + 0x20]
sub eax, esi
sub edx, dword [ebp - 4]
add edi, esi
mov ebx, dword [ebp - 0xc]
mov esi, eax
shr esi, 2
mov dword [ebp - 0x18], edx
inc esi
mov dword [ebp - 0x14], eax
mov eax, dword [edi]
lea ecx, [ebx + edi]
mov edx, dword [ecx + edx]
lea edi, [edi + 4]
xor eax, edx
mov dword [ecx], eax
mov dword [edi - 4], edx
mov edx, dword [ebp - 0x18]
sub esi, 1
jne 0x604d33
mov ebx, dword [ebp - 8]
mov edi, dword [ebp - 4]
add dword [ebp - 0xc], 0x10
sub ebx, 0x10
add dword [ebp + 0x20], 0x10
add edi, 0x10
mov edx, dword [ebp + 0x24]
xor esi, esi
sub dword [ebp - 0x10], 1
mov dword [ebp - 8], ebx
mov dword [ebp - 4], edi
jne 0x604d00
test ebx, ebx
je 0x604dbd
push dword [ebp + 0x14]
mov eax, dword [ebp + 0x18]
push eax
push eax
call edx
mov ecx, dword [ebp + 0x18]
add esp, 0xc
sub dword [ebp + 0x20], edi
sub edi, ecx
lea eax, [esi + ecx]
add esi, ebx
mov dword [ebp - 0x18], esi
mov esi, dword [ebp + 0x20]
mov dword [ebp - 0x10], eax
nop dword [eax]
lea ecx, [eax + edi]
mov al, byte [eax]
mov dl, byte [ecx + esi]
xor al, dl
mov byte [ecx], al
mov eax, dword [ebp - 0x10]
mov byte [eax], dl
inc eax
mov dword [ebp - 0x10], eax
sub ebx, 1
jne 0x604da0
mov esi, dword [ebp - 0x18]
mov eax, dword [ebp + 0x1c]
pop edi
mov dword [eax], esi
pop esi
pop ebx
mov esp, ebp
pop ebp
ret