Function at 0x590d87
Capabilities:
Encode data using xor

Disassembly:
push ebx
mov ebx, dword [esp + 8]
push ebp
push esi
mov esi, dword [esp + 0x18]
mov edx, dword [ebx + 0xe8]
push edi
test edx, edx
je 0x590da8
mov eax, dword [ebx + 0x84]
sub eax, esi
dec eax
jmp 0x590daa
mov eax, esi
mov ebp, dword [ebx + 0xcc]
mov edi, ebp
mov ecx, dword [ebx + 0xd4]
imul edi, eax
mov eax, ecx
imul eax, dword [esp + 0x18]
add edi, eax
add edi, dword [ebx + 0xc8]
test edx, edx
je 0x590dd0
neg ebp
cmp dword [ebx + 0xe0], 0
jne 0x591194
cmp dword [ebx + 0xe4], 0
jne 0x591194
mov eax, dword [ebx + 0xd8]
test al, 2
je 0x590e24
mov ecx, dword [esp + 0x20]
test ecx, ecx
je 0x5911b8
mov al, byte [ebx + 0xf0]
xor byte [edi + 2], al
mov al, byte [ebx + 0xf4]
xor byte [edi + 1], al
mov al, byte [ebx + 0xf8]
xor byte [edi], al
add edi, ebp
dec ecx
jne 0x590e00
jmp 0x5911b8
test eax, 0x100
je 0x590e64
mov ecx, dword [esp + 0x20]
test ecx, ecx
je 0x5911b8
mov al, byte [ebx + 0xf0]
mov byte [edi + 2], al
mov al, byte [ebx + 0xf4]
mov byte [edi + 1], al
mov al, byte [ebx + 0xf8]
mov byte [edi], al
mov al, byte [ebx + 0xfc]
mov byte [edi + 3], al
add edi, ebp
dec ecx
jne 0x590e37
jmp 0x5911b8
test al, 8
je 0x590e90
cmp ecx, 4
jne 0x5911b8
mov ecx, dword [esp + 0x20]
test ecx, ecx
je 0x5911b8
mov al, byte [ebx + 0xfc]
mov byte [edi + 3], al
add edi, ebp
dec ecx
jne 0x590e7d
jmp 0x5911b8
test al, 0x10
je 0x59103f
cmp ecx, 4
jne 0x590fe1
mov eax, dword [esp + 0x20]
jmp 0x590fd0
movzx edx, byte [edi + 3]
mov ecx, dword [ebx + 0xfc]
mov dword [esp + 0x18], edx
test ecx, ecx
jne 0x590ec2
movzx eax, byte [edi + 2]
jmp 0x590f03
test edx, edx
jne 0x590ed1
mov eax, dword [ebx + 0xf0]
cdq
idiv ecx
jmp 0x590eff
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 2]
imul ecx, dword [ebx + 0xf0], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov edx, dword [esp + 0x18]
mov byte [edi + 2], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x590f16
movzx eax, byte [edi + 1]
jmp 0x590f53
test edx, edx
jne 0x590f25
mov eax, dword [ebx + 0xf4]
cdq
idiv ecx
jmp 0x590f53
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 1]
imul ecx, dword [ebx + 0xf4], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi + 1], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x590f65
movzx eax, byte [edi]
jmp 0x590fa5
mov edx, dword [esp + 0x18]
test edx, edx
jne 0x590f78
mov eax, dword [ebx + 0xf8]
cdq
idiv ecx
jmp 0x590fa5
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi]
imul ecx, dword [ebx + 0xf8], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi], al
imul ecx, dword [ebx + 0xfc], 0xff
mov eax, dword [ebx + 0x100]
imul eax, dword [esp + 0x18]
add eax, ecx
mov ecx, 0xff
cdq
idiv ecx
mov byte [edi + 3], al
mov eax, dword [esp + 0x14]
dec eax
add edi, ebp
mov dword [esp + 0x14], eax
test eax, eax
jne 0x590eaa
jmp 0x5911b8
mov ecx, dword [esp + 0x20]
test ecx, ecx
je 0x5911b8
mov esi, 0xff
movzx eax, byte [edi + 2]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf0]
cdq
idiv esi
mov byte [edi + 2], al
movzx eax, byte [edi + 1]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf4]
cdq
idiv esi
mov byte [edi + 1], al
movzx eax, byte [edi]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf8]
cdq
idiv esi
mov byte [edi], al
add edi, ebp
dec ecx
jne 0x590ff2
jmp 0x5911b8
test al, 0x20
je 0x59116b
cmp ecx, 4
jne 0x59116b
mov eax, dword [esp + 0x20]
jmp 0x59115d
movzx edx, byte [edi + 3]
mov ecx, dword [ebx + 0xfc]
mov dword [esp + 0x18], edx
test ecx, ecx
jne 0x591071
movzx eax, byte [edi + 2]
jmp 0x5910b2
test edx, edx
jne 0x591080
mov eax, dword [ebx + 0xf0]
cdq
idiv ecx
jmp 0x5910ae
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 2]
imul ecx, dword [ebx + 0xf0], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov edx, dword [esp + 0x18]
mov byte [edi + 2], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x5910c5
movzx eax, byte [edi + 1]
jmp 0x591102
test edx, edx
jne 0x5910d4
mov eax, dword [ebx + 0xf4]
cdq
idiv ecx
jmp 0x591102
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 1]
imul ecx, dword [ebx + 0xf4], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi + 1], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x591114
movzx eax, byte [edi]
jmp 0x591154
mov edx, dword [esp + 0x18]
test edx, edx
jne 0x591127
mov eax, dword [ebx + 0xf8]
cdq
idiv ecx
jmp 0x591154
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi]
imul ecx, dword [ebx + 0xf8], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi], al
mov eax, dword [esp + 0x14]
dec eax
add edi, ebp
mov dword [esp + 0x14], eax
test eax, eax
jne 0x591059
jmp 0x5911b8
mov ecx, dword [esp + 0x20]
test ecx, ecx
je 0x5911b8
mov al, byte [ebx + 0xf0]
mov byte [edi + 2], al
mov al, byte [ebx + 0xf4]
mov byte [edi + 1], al
mov al, byte [ebx + 0xf8]
mov byte [edi], al
add edi, ebp
dec ecx
jne 0x591173
jmp 0x5911b8
mov eax, dword [esp + 0x20]
mov dword [esp + 0x14], eax
test eax, eax
je 0x5911b8
push edi
push esi
push dword [esp + 0x20]
push ebx
call fcn.005908b9
add esp, 0x10
add edi, ebp
inc esi
dec dword [esp + 0x14]
jne 0x5911a0
pop edi
pop esi
pop ebp
pop ebx
ret