Function at 0x4873b5
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
push ebp
mov ebp, esp
push ecx
push ecx
push ebx
push esi
mov esi, dword [ebp + 8]
mov ebx, ecx
not ebx
test esi, esi
je 0x4873e4
test dl, 3
je 0x4873e4
movzx eax, byte [edx]
xor eax, ebx
shr ebx, 8
movzx eax, al
xor ebx, dword [eax*4 + 0x509470]
inc edx
sub esi, 1
jne 0x4873c7
push edi
cmp esi, 0x20
jb 0x4875ca
mov eax, esi
shr eax, 5
mov dword [ebp - 8], eax
xor ebx, dword [edx]
add edx, 4
mov eax, ebx
mov dword [ebp - 4], edx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edi, dword [ebp - 4]
mov edx, dword [ecx*4 + 0x509870]
xor edx, dword [eax*4 + 0x509c70]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x509470]
movzx eax, bl
xor edx, dword [eax*4 + 0x50a070]
xor edx, dword [edi]
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x509870]
xor ebx, dword [eax*4 + 0x509c70]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x509470]
movzx eax, dl
xor ebx, dword [eax*4 + 0x50a070]
xor ebx, dword [edi + 4]
mov eax, ebx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x509870]
xor edx, dword [eax*4 + 0x509c70]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x509470]
movzx eax, bl
xor edx, dword [eax*4 + 0x50a070]
xor edx, dword [edi + 8]
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x509870]
xor ebx, dword [eax*4 + 0x509c70]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x509470]
movzx eax, dl
xor ebx, dword [eax*4 + 0x50a070]
xor ebx, dword [edi + 0xc]
mov eax, ebx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x509870]
xor edx, dword [eax*4 + 0x509c70]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x509470]
movzx eax, bl
xor edx, dword [eax*4 + 0x50a070]
xor edx, dword [edi + 0x10]
mov eax, edx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x509870]
xor ebx, dword [eax*4 + 0x509c70]
sub esi, 0x20
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x509470]
movzx eax, dl
xor ebx, dword [eax*4 + 0x50a070]
xor ebx, dword [edi + 0x14]
mov eax, ebx
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov edx, dword [ecx*4 + 0x509870]
xor edx, dword [eax*4 + 0x509c70]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x509470]
movzx eax, bl
xor edx, dword [eax*4 + 0x50a070]
xor edx, dword [edi + 0x18]
add edi, 0x1c
mov eax, edx
mov dword [ebp - 4], edi
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov ebx, dword [ecx*4 + 0x509870]
xor ebx, dword [eax*4 + 0x509c70]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x509470]
movzx eax, dl
mov edx, edi
xor ebx, dword [eax*4 + 0x50a070]
sub dword [ebp - 8], 1
jne 0x4873f6
cmp esi, 4
jb 0x487617
mov edi, esi
shr edi, 2
xor ebx, dword [edx]
sub esi, 4
mov eax, ebx
add edx, 4
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov ecx, dword [ecx*4 + 0x509870]
xor ecx, dword [eax*4 + 0x509c70]
mov eax, ebx
shr eax, 0x18
xor ecx, dword [eax*4 + 0x509470]
movzx eax, bl
xor ecx, dword [eax*4 + 0x50a070]
mov ebx, ecx
sub edi, 1
jne 0x4875d4
pop edi
test esi, esi
je 0x487634
movzx eax, byte [edx]
xor eax, ebx
shr ebx, 8
movzx eax, al
xor ebx, dword [eax*4 + 0x509470]
inc edx
sub esi, 1
jne 0x48761c
not ebx
pop esi
mov eax, ebx
pop ebx
mov esp, ebp
pop ebp
ret