Function at 0x402a30
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
push ebx
push edi
mov edi, dword [esp + 0xc]
mov ebx, edx
not ecx
test edi, edi
je 0x402a5d
mov edi, edi
test bl, 3
je 0x402a5d
movzx eax, byte [ebx]
xor eax, ecx
and eax, 0xff
shr ecx, 8
xor ecx, dword [eax*4 + 0x5cb130]
inc ebx
dec edi
jne 0x402a40
push esi
cmp edi, 0x20
jb 0x402c70
push ebp
mov ebp, edi
shr ebp, 5
lea ecx, [ecx]
xor ecx, dword [ebx]
add ebx, 8
mov edx, ecx
shr edx, 0x10
mov eax, ecx
shr eax, 8
and eax, 0xff
and edx, 0xff
mov dword [esp + 0x14], ebx
mov edx, dword [edx*4 + 0x5cb530]
xor edx, dword [eax*4 + 0x5cb930]
mov eax, ecx
shr eax, 0x18
mov esi, dword [esp + 0x14]
xor edx, dword [eax*4 + 0x5cb130]
movzx eax, cl
xor edx, dword [eax*4 + 0x5cbd30]
xor edx, dword [ebx - 4]
mov ecx, edx
shr ecx, 0x10
and ecx, 0xff
mov eax, edx
mov ebx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor ebx, dword [eax*4 + 0x5cb930]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x5cb130]
movzx eax, dl
xor ebx, dword [eax*4 + 0x5cbd30]
xor ebx, dword [esi]
mov ecx, ebx
shr ecx, 0x10
and ecx, 0xff
mov eax, ebx
mov edx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor edx, dword [eax*4 + 0x5cb930]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x5cb130]
movzx eax, bl
xor edx, dword [eax*4 + 0x5cbd30]
xor edx, dword [esi + 4]
mov ecx, edx
shr ecx, 0x10
and ecx, 0xff
mov eax, edx
mov ebx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor ebx, dword [eax*4 + 0x5cb930]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x5cb130]
movzx eax, dl
xor ebx, dword [eax*4 + 0x5cbd30]
xor ebx, dword [esi + 8]
mov ecx, ebx
shr ecx, 0x10
and ecx, 0xff
mov eax, ebx
mov edx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor edx, dword [eax*4 + 0x5cb930]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x5cb130]
movzx eax, bl
xor edx, dword [eax*4 + 0x5cbd30]
xor edx, dword [esi + 0xc]
mov ecx, edx
shr ecx, 0x10
and ecx, 0xff
mov eax, edx
mov ebx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor ebx, dword [eax*4 + 0x5cb930]
mov eax, edx
shr eax, 0x18
add esi, 0x14
xor ebx, dword [eax*4 + 0x5cb130]
movzx eax, dl
sub edi, 0x20
xor ebx, dword [eax*4 + 0x5cbd30]
mov dword [esp + 0x14], esi
xor ebx, dword [esi - 4]
mov ecx, ebx
shr ecx, 0x10
and ecx, 0xff
mov eax, ebx
mov edx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor edx, dword [eax*4 + 0x5cb930]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x5cb130]
movzx eax, bl
mov ebx, esi
xor edx, dword [eax*4 + 0x5cbd30]
add ebx, 4
xor edx, dword [ebx - 4]
mov ecx, edx
shr ecx, 0x10
and ecx, 0xff
mov eax, edx
mov ecx, dword [ecx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
xor ecx, dword [eax*4 + 0x5cb930]
mov eax, edx
shr eax, 0x18
xor ecx, dword [eax*4 + 0x5cb130]
movzx eax, dl
xor ecx, dword [eax*4 + 0x5cbd30]
dec ebp
jne 0x402a70
pop ebp
cmp edi, 4
jb 0x402cc6
mov esi, edi
shr esi, 2
lea ebx, [ebx]
xor ecx, dword [ebx]
add ebx, 4
mov edx, ecx
shr edx, 0x10
and edx, 0xff
mov eax, ecx
mov edx, dword [edx*4 + 0x5cb530]
shr eax, 8
and eax, 0xff
sub edi, 4
xor edx, dword [eax*4 + 0x5cb930]
mov eax, ecx
shr eax, 0x18
xor edx, dword [eax*4 + 0x5cb130]
movzx eax, cl
xor edx, dword [eax*4 + 0x5cbd30]
mov ecx, edx
dec esi
jne 0x402c80
pop esi
test edi, edi
je 0x402cea
jmp 0x402cd0
movzx eax, byte [ebx]
xor eax, ecx
and eax, 0xff
shr ecx, 8
xor ecx, dword [eax*4 + 0x5cb130]
lea ebx, [ebx + 1]
dec edi
jne 0x402cd0
not ecx
pop edi
mov eax, ecx
pop ebx
ret