Function at 0x51f670
Capabilities:
Encode data using xor
Hash data with crc32

Disassembly:
push ebp
mov ebp, esp
mov eax, dword [ebp + 8]
push ebx
mov ebx, dword [ebp + 0xc]
not eax
push edi
mov edi, dword [ebp + 0x10]
test edi, edi
je 0x51f6a1
test bl, 3
je 0x51f6a1
movzx ecx, byte [ebx]
inc ebx
xor ecx, eax
shr eax, 8
movzx ecx, cl
xor eax, dword [ecx*4 + 0x57c830]
sub edi, 1
jne 0x51f684
push esi
cmp edi, 0x20
jb 0x51f88f
mov ecx, edi
shr ecx, 5
mov dword [ebp + 8], ecx
xor eax, dword [ebx]
mov ecx, eax
shr ecx, 0x10
movzx edx, cl
mov ecx, eax
shr ecx, 8
movzx ecx, cl
mov edx, dword [edx*4 + 0x57cc30]
xor edx, dword [ecx*4 + 0x57d030]
mov ecx, eax
movzx eax, al
shr ecx, 0x18
xor edx, dword [ecx*4 + 0x57c830]
xor edx, dword [eax*4 + 0x57d430]
xor edx, dword [ebx + 4]
add ebx, 8
mov eax, edx
mov dword [ebp + 0xc], ebx
shr eax, 0x10
movzx ecx, al
mov eax, edx
shr eax, 8
movzx eax, al
mov esi, dword [ebp + 0xc]
mov ebx, dword [ecx*4 + 0x57cc30]
xor ebx, dword [eax*4 + 0x57d030]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x57c830]
movzx eax, dl
xor ebx, dword [eax*4 + 0x57d430]
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 + 0x57cc30]
xor edx, dword [eax*4 + 0x57d030]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x57c830]
movzx eax, bl
xor edx, dword [eax*4 + 0x57d430]
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 + 0x57cc30]
xor ebx, dword [eax*4 + 0x57d030]
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x57c830]
movzx eax, dl
xor ebx, dword [eax*4 + 0x57d430]
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 + 0x57cc30]
xor edx, dword [eax*4 + 0x57d030]
mov eax, ebx
shr eax, 0x18
xor edx, dword [eax*4 + 0x57c830]
movzx eax, bl
xor edx, dword [eax*4 + 0x57d430]
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 + 0x57cc30]
xor ebx, dword [eax*4 + 0x57d030]
sub edi, 0x20
mov eax, edx
shr eax, 0x18
xor ebx, dword [eax*4 + 0x57c830]
movzx eax, dl
xor ebx, dword [eax*4 + 0x57d430]
xor ebx, dword [esi + 0x10]
add esi, 0x14
mov eax, ebx
mov dword [ebp + 0xc], esi
shr eax, 0x10
movzx ecx, al
mov eax, ebx
shr eax, 8
movzx eax, al
mov ecx, dword [ecx*4 + 0x57cc30]
xor ecx, dword [eax*4 + 0x57d030]
mov eax, ebx
shr eax, 0x18
xor ecx, dword [eax*4 + 0x57c830]
movzx eax, bl
mov ebx, esi
xor ecx, dword [eax*4 + 0x57d430]
xor ecx, dword [ebx]
add ebx, 4
mov eax, ecx
mov dword [ebp + 0xc], ecx
shr eax, 0x10
movzx edx, al
mov eax, ecx
shr eax, 8
movzx ecx, al
mov eax, dword [edx*4 + 0x57cc30]
mov edx, dword [ebp + 0xc]
xor eax, dword [ecx*4 + 0x57d030]
mov ecx, edx
shr ecx, 0x18
xor eax, dword [ecx*4 + 0x57c830]
movzx ecx, dl
xor eax, dword [ecx*4 + 0x57d430]
sub dword [ebp + 8], 1
jne 0x51f6b3
cmp edi, 4
jb 0x51f8e3
mov esi, edi
shr esi, 2
nop dword [eax]
xor eax, dword [ebx]
sub edi, 4
mov ecx, eax
add ebx, 4
shr ecx, 0x10
movzx edx, cl
mov ecx, eax
shr ecx, 8
movzx ecx, cl
mov edx, dword [edx*4 + 0x57cc30]
xor edx, dword [ecx*4 + 0x57d030]
mov ecx, eax
shr ecx, 0x18
movzx eax, al
xor edx, dword [ecx*4 + 0x57c830]
xor edx, dword [eax*4 + 0x57d430]
mov eax, edx
sub esi, 1
jne 0x51f8a0
pop esi
test edi, edi
je 0x51f902
movzx ecx, byte [ebx]
lea ebx, [ebx + 1]
xor ecx, eax
shr eax, 8
movzx ecx, cl
xor eax, dword [ecx*4 + 0x57c830]
sub edi, 1
jne 0x51f8e8
pop edi
not eax
pop ebx
pop ebp
ret