Function at 0x491660
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
jmp 0x491670
sub esp, 0x1c
push ebx
mov ebx, dword [esp + 0x28]
test ebx, ebx
jne 0x491683
xor eax, eax
pop ebx
add esp, 0x1c
ret
mov ecx, dword [esp + 0x24]
push edi
mov edi, dword [esp + 0x30]
not ecx
cmp edi, 0x17
jb 0x49199d
test bl, 3
je 0x4916b4
movzx eax, byte [ebx]
inc ebx
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
sub edi, 1
jne 0x491697
mov eax, 0xcccccccd
mov dword [esp + 0x2c], ebx
mul edi
push ebp
mov ebp, edx
shr ebp, 4
imul eax, ebp, 0xffffffec
push esi
xor esi, esi
mov dword [esp + 0x10], esi
mov dword [esp + 0x14], esi
add edi, eax
mov dword [esp + 0x18], esi
mov dword [esp + 0x38], edi
sub ebp, 1
je 0x491868
xor edi, edi
mov esi, dword [esp + 0x34]
mov ebx, dword [ebx]
xor ebx, ecx
mov eax, dword [esi + 4]
xor eax, edi
mov edx, dword [esi + 8]
xor edx, dword [esp + 0x10]
mov dword [esp + 0x24], eax
mov ecx, dword [esi + 0xc]
xor ecx, dword [esp + 0x14]
movzx eax, al
mov dword [esp + 0x1c], ecx
mov ecx, dword [esi + 0x10]
add esi, 0x14
xor ecx, dword [esp + 0x18]
mov edi, dword [eax*4 + 0x4ce2b8]
movzx eax, dl
mov dword [esp + 0x20], ecx
mov dword [esp + 0x28], edx
movzx ecx, bl
mov eax, dword [eax*4 + 0x4ce2b8]
mov dword [esp + 0x10], eax
mov eax, dword [esp + 0x1c]
movzx eax, al
mov ecx, dword [ecx*4 + 0x4ce2b8]
mov dword [esp + 0x34], esi
mov esi, dword [esp + 0x24]
mov eax, dword [eax*4 + 0x4ce2b8]
mov dword [esp + 0x14], eax
mov eax, dword [esp + 0x20]
movzx eax, al
mov eax, dword [eax*4 + 0x4ce2b8]
mov dword [esp + 0x18], eax
mov eax, ebx
shr eax, 0x10
movzx edx, al
mov eax, ebx
shr eax, 8
movzx eax, al
shr ebx, 0x18
mov edx, dword [edx*4 + 0x4ceab8]
xor edx, dword [eax*4 + 0x4ce6b8]
mov eax, esi
xor edx, dword [ebx*4 + 0x4ceeb8]
shr eax, 0x10
xor ecx, edx
movzx edx, al
mov eax, esi
shr eax, 8
movzx eax, al
mov ebx, dword [esp + 0x1c]
mov edx, dword [edx*4 + 0x4ceab8]
shr esi, 0x18
xor edx, dword [eax*4 + 0x4ce6b8]
xor edx, dword [esi*4 + 0x4ceeb8]
mov esi, dword [esp + 0x28]
xor edi, edx
mov eax, esi
shr eax, 0x10
movzx edx, al
mov eax, esi
shr eax, 8
movzx eax, al
shr esi, 0x18
mov edx, dword [edx*4 + 0x4ceab8]
xor edx, dword [eax*4 + 0x4ce6b8]
mov eax, ebx
xor edx, dword [esi*4 + 0x4ceeb8]
xor dword [esp + 0x10], edx
shr eax, 0x10
movzx edx, al
mov eax, ebx
shr eax, 8
movzx eax, al
shr ebx, 0x18
mov edx, dword [edx*4 + 0x4ceab8]
xor edx, dword [eax*4 + 0x4ce6b8]
xor edx, dword [ebx*4 + 0x4ceeb8]
mov ebx, dword [esp + 0x20]
mov eax, ebx
xor dword [esp + 0x14], edx
shr eax, 0x10
movzx edx, al
mov eax, ebx
shr eax, 8
movzx eax, al
shr ebx, 0x18
mov edx, dword [edx*4 + 0x4ceab8]
xor edx, dword [eax*4 + 0x4ce6b8]
xor edx, dword [ebx*4 + 0x4ceeb8]
xor dword [esp + 0x18], edx
mov ebx, dword [esp + 0x34]
sub ebp, 1
jne 0x4916e8
mov dword [esp + 0x28], edi
mov edi, dword [esp + 0x38]
mov esi, dword [esp + 0x28]
mov edx, dword [ebx]
xor edx, ecx
mov ecx, dword [ebx + 4]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
xor ecx, edx
mov edx, dword [ebx + 8]
xor ecx, esi
mov ebx, dword [ebx + 0xc]
movzx eax, cl
shr ecx, 8
mov esi, dword [esp + 0x34]
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
xor edx, ecx
mov ecx, dword [esi + 0x10]
xor edx, dword [esp + 0x10]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
movzx eax, dl
shr edx, 8
xor edx, dword [eax*4 + 0x4cdab8]
xor ebx, edx
xor ebx, dword [esp + 0x14]
movzx eax, bl
shr ebx, 8
xor ebx, dword [eax*4 + 0x4cdab8]
movzx eax, bl
shr ebx, 8
xor ebx, dword [eax*4 + 0x4cdab8]
movzx eax, bl
shr ebx, 8
xor ebx, dword [eax*4 + 0x4cdab8]
movzx eax, bl
shr ebx, 8
xor ebx, dword [eax*4 + 0x4cdab8]
xor ecx, ebx
mov ebx, esi
xor ecx, dword [esp + 0x18]
movzx eax, cl
shr ecx, 8
pop esi
pop ebp
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, cl
shr ecx, 8
xor ecx, dword [eax*4 + 0x4cdab8]
add ebx, 0x14
cmp edi, 8
jb 0x491a56
mov edx, edi
shr edx, 3
nop dword [eax + eax]
movzx eax, byte [ebx]
sub edi, 8
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 1]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 2]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 3]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 4]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 5]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 6]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
movzx eax, byte [ebx + 7]
add ebx, 8
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
sub edx, 1
jne 0x4919b0
test edi, edi
je 0x491a7a
nop word [eax + eax]
movzx eax, byte [ebx]
lea ebx, [ebx + 1]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4cdab8]
sub edi, 1
jne 0x491a60
not ecx
pop edi
mov eax, ecx
pop ebx
add esp, 0x1c
ret