Function at 0x491940
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
push ebp
mov ebp, esp
push ecx
push ebx
push edi
mov edi, dword [ebp + 8]
mov ebx, edx
not ecx
test edi, edi
je 0x49196e
test bl, 3
je 0x49196e
movzx eax, byte [ebx]
inc ebx
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4a7bd8]
sub edi, 1
jne 0x491951
push esi
cmp edi, 0x20
jb 0x491b56
mov eax, edi
shr eax, 5
mov dword [ebp - 4], eax
xor ecx, dword [ebx]
mov eax, ecx
shr eax, 0x10
movzx edx, al
mov eax, ecx
shr eax, 8
movzx eax, al
mov edx, dword [edx*4 + 0x4a7fd8]
xor edx, dword [eax*4 + 0x4a83d8]
mov eax, ecx
shr eax, 0x18
xor edx, dword [eax*4 + 0x4a7bd8]
movzx eax, cl
xor edx, dword [eax*4 + 0x4a87d8]
xor edx, dword [ebx + 4]
add ebx, 8
mov eax, edx
mov dword [ebp + 8], ebx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov esi, dword [ebp + 8]
mov ebx, dword [ecx*4 + 0x4a7fd8]
xor ebx, dword [eax*4 + 0x4a83d8]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x4a7bd8]
movzx eax, dl
xor ebx, dword [eax*4 + 0x4a87d8]
xor ebx, dword [esi]
mov eax, ebx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x4a7fd8]
xor edx, dword [eax*4 + 0x4a83d8]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x4a7bd8]
movzx eax, bl
xor edx, dword [eax*4 + 0x4a87d8]
xor edx, dword [esi + 4]
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x4a7fd8]
xor ebx, dword [eax*4 + 0x4a83d8]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x4a7bd8]
movzx eax, dl
xor ebx, dword [eax*4 + 0x4a87d8]
xor ebx, dword [esi + 8]
mov eax, ebx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x4a7fd8]
xor edx, dword [eax*4 + 0x4a83d8]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x4a7bd8]
movzx eax, bl
xor edx, dword [eax*4 + 0x4a87d8]
xor edx, dword [esi + 0xc]
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x4a7fd8]
xor ebx, dword [eax*4 + 0x4a83d8]
sub edi, 0x20
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x4a7bd8]
movzx eax, dl
xor ebx, dword [eax*4 + 0x4a87d8]
xor ebx, dword [esi + 0x10]
add esi, 0x14
mov eax, ebx
mov dword [ebp + 8], esi
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x4a7fd8]
xor edx, dword [eax*4 + 0x4a83d8]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x4a7bd8]
movzx eax, bl
mov ebx, esi
xor edx, dword [eax*4 + 0x4a87d8]
xor edx, dword [ebx]
add ebx, 4
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ecx, dword [ecx*4 + 0x4a7fd8]
xor ecx, dword [eax*4 + 0x4a83d8]
mov eax, edx
shr eax, 0x18
xor ecx, dword [eax*4 + 0x4a7bd8]
movzx eax, dl
xor ecx, dword [eax*4 + 0x4a87d8]
sub dword [ebp - 4], 1
jne 0x491980
cmp edi, 4
jb 0x491ba3
mov esi, edi
shr esi, 2
xor ecx, dword [ebx]
sub edi, 4
mov eax, ecx
add ebx, 4
shr eax, 0x10
movzx edx, al
mov eax, ecx
shr eax, 8
movzx eax, al
mov edx, dword [edx*4 + 0x4a7fd8]
xor edx, dword [eax*4 + 0x4a83d8]
mov eax, ecx
shr eax, 0x18
xor edx, dword [eax*4 + 0x4a7bd8]
movzx eax, cl
xor edx, dword [eax*4 + 0x4a87d8]
mov ecx, edx
sub esi, 1
jne 0x491b60
pop esi
test edi, edi
je 0x491bc2
movzx eax, byte [ebx]
lea ebx, [ebx + 1]
xor eax, ecx
shr ecx, 8
movzx eax, al
xor ecx, dword [eax*4 + 0x4a7bd8]
sub edi, 1
jne 0x491ba8
not ecx
pop edi
mov eax, ecx
pop ebx
mov esp, ebp
pop ebp
ret