Function at 0x421b72
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
mov edi, edi
push ebp
mov ebp, esp
push ecx
cmp dword [ebp + 8], 0
push esi
not eax
mov ecx, 0xff
je 0x421ba2
test dl, 3
je 0x421ba2
movzx esi, byte [edx]
xor esi, eax
and esi, ecx
shr eax, 8
xor eax, dword [esi*4 + 0x439dc0]
inc edx
dec dword [ebp + 8]
jne 0x421b86
cmp dword [ebp + 8], 0x20
push ebx
push edi
push 4
mov esi, edx
pop edi
jb 0x421d71
mov edx, dword [ebp + 8]
shr edx, 5
mov dword [ebp - 4], edx
xor eax, dword [esi]
add esi, edi
mov edx, eax
shr edx, 0x10
mov ebx, eax
shr ebx, 8
and edx, ecx
mov edx, dword [edx*4 + 0x43a1c0]
and ebx, ecx
xor edx, dword [ebx*4 + 0x43a5c0]
mov ebx, eax
shr ebx, 0x18
xor edx, dword [ebx*4 + 0x439dc0]
and eax, ecx
xor edx, dword [eax*4 + 0x43a9c0]
xor edx, dword [esi]
add esi, edi
mov eax, edx
shr eax, 0x10
mov ebx, edx
shr ebx, 8
and eax, ecx
mov eax, dword [eax*4 + 0x43a1c0]
and ebx, ecx
xor eax, dword [ebx*4 + 0x43a5c0]
mov ebx, edx
shr ebx, 0x18
xor eax, dword [ebx*4 + 0x439dc0]
and edx, ecx
xor eax, dword [edx*4 + 0x43a9c0]
xor eax, dword [esi]
add esi, edi
mov edx, eax
shr edx, 0x10
mov ebx, eax
and edx, ecx
mov edx, dword [edx*4 + 0x43a1c0]
shr ebx, 8
and ebx, ecx
xor edx, dword [ebx*4 + 0x43a5c0]
mov ebx, eax
shr ebx, 0x18
xor edx, dword [ebx*4 + 0x439dc0]
and eax, ecx
xor edx, dword [eax*4 + 0x43a9c0]
xor edx, dword [esi]
add esi, edi
mov eax, edx
shr eax, 0x10
mov ebx, edx
shr ebx, 8
and eax, ecx
mov eax, dword [eax*4 + 0x43a1c0]
and ebx, ecx
xor eax, dword [ebx*4 + 0x43a5c0]
mov ebx, edx
shr ebx, 0x18
xor eax, dword [ebx*4 + 0x439dc0]
and edx, ecx
xor eax, dword [edx*4 + 0x43a9c0]
xor eax, dword [esi]
add esi, edi
mov edx, eax
shr edx, 0x10
mov ebx, eax
and edx, ecx
mov edx, dword [edx*4 + 0x43a1c0]
shr ebx, 8
and ebx, ecx
xor edx, dword [ebx*4 + 0x43a5c0]
mov ebx, eax
shr ebx, 0x18
xor edx, dword [ebx*4 + 0x439dc0]
and eax, ecx
xor edx, dword [eax*4 + 0x43a9c0]
xor edx, dword [esi]
add esi, edi
mov eax, edx
shr eax, 0x10
and eax, ecx
mov ebx, edx
mov eax, dword [eax*4 + 0x43a1c0]
shr ebx, 8
and ebx, ecx
xor eax, dword [ebx*4 + 0x43a5c0]
mov ebx, edx
shr ebx, 0x18
xor eax, dword [ebx*4 + 0x439dc0]
and edx, ecx
xor eax, dword [edx*4 + 0x43a9c0]
sub dword [ebp + 8], 0x20
xor eax, dword [esi]
add esi, edi
mov edx, eax
mov ebx, eax
shr edx, 0x10
shr ebx, 8
and edx, ecx
mov edx, dword [edx*4 + 0x43a1c0]
and ebx, ecx
xor edx, dword [ebx*4 + 0x43a5c0]
mov ebx, eax
shr ebx, 0x18
xor edx, dword [ebx*4 + 0x439dc0]
and eax, ecx
xor edx, dword [eax*4 + 0x43a9c0]
xor edx, dword [esi]
add esi, edi
mov eax, edx
shr eax, 0x10
and eax, ecx
mov eax, dword [eax*4 + 0x43a1c0]
mov ebx, edx
shr ebx, 8
and ebx, ecx
xor eax, dword [ebx*4 + 0x43a5c0]
mov ebx, edx
shr ebx, 0x18
xor eax, dword [ebx*4 + 0x439dc0]
and edx, ecx
xor eax, dword [edx*4 + 0x43a9c0]
dec dword [ebp - 4]
jne 0x421bbc
cmp dword [ebp + 8], edi
jb 0x421dbe
mov edx, dword [ebp + 8]
shr edx, 2
mov dword [ebp - 4], edx
xor eax, dword [esi]
sub dword [ebp + 8], edi
mov edx, eax
shr edx, 0x10
and edx, ecx
mov edx, dword [edx*4 + 0x43a1c0]
mov ebx, eax
shr ebx, 8
and ebx, ecx
xor edx, dword [ebx*4 + 0x43a5c0]
mov ebx, eax
shr ebx, 0x18
xor edx, dword [ebx*4 + 0x439dc0]
and eax, ecx
xor edx, dword [eax*4 + 0x43a9c0]
add esi, edi
dec dword [ebp - 4]
mov eax, edx
jne 0x421d7f
cmp dword [ebp + 8], 0
pop edi
pop ebx
je 0x421ddd
movzx edx, byte [esi]
xor edx, eax
and edx, ecx
shr eax, 8
xor eax, dword [edx*4 + 0x439dc0]
inc esi
dec dword [ebp + 8]
jne 0x421dc6
not eax
pop esi
leave
ret