Function at 0x420874
Capabilities:
Encode data using xor
Encrypt data using aes
Reference aes constants

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x30
push esi
push edi
mov esi, ecx
mov edi, eax
mov eax, dword [esi + 0x3cc]
cmp eax, 0x10
jne 0x42089b
push esi
mov esi, dword [ebp + 8]
mov eax, edi
call fcn.00420530
jmp 0x420aeb
cdq
and edx, 3
add eax, edx
push ebx
mov ebx, eax
sar ebx, 2
xor ecx, ecx
mov eax, ebx
sub eax, 4
cmp ebx, 6
setne cl
inc ecx
neg eax
sbb eax, eax
and eax, ecx
shl eax, 5
mov ecx, dword [eax + 0x5b92a8]
mov dword [ebp - 0x20], ecx
mov ecx, dword [eax + 0x5b92b0]
mov eax, dword [eax + 0x5b92b8]
mov dword [ebp - 0x24], eax
mov dword [ebp - 8], ecx
lea eax, [esi + 0x454]
test ebx, ebx
jle 0x420922
lea ecx, [esi + 8]
mov dword [ebp - 4], ecx
mov dword [ebp - 0x14], ebx
movzx ecx, byte [edi]
shl ecx, 0x18
mov dword [eax], ecx
inc edi
movzx ecx, byte [edi]
shl ecx, 0x10
or dword [eax], ecx
inc edi
movzx ecx, byte [edi]
shl ecx, 8
or dword [eax], ecx
inc edi
movzx edx, byte [edi]
or dword [eax], edx
mov edx, dword [ebp - 4]
mov edx, dword [edx]
add dword [ebp - 4], 4
mov ecx, eax
xor dword [ecx], edx
inc edi
add eax, 4
dec dword [ebp - 0x14]
jne 0x4208ec
xor eax, eax
inc eax
cmp dword [esi + 0x3d0], eax
mov dword [ebp - 0x14], eax
mov edi, 0xff
jle 0x420a1c
lea eax, [esi + 0x28]
mov dword [ebp - 0x10], eax
test ebx, ebx
jle 0x4209ea
mov ecx, dword [ebp - 0x20]
lea eax, [esi + 0x434]
mov dword [ebp - 0x18], eax
mov eax, dword [ebp - 0x10]
mov dword [ebp - 0xc], eax
mov eax, dword [ebp - 8]
sub eax, ecx
mov dword [ebp - 0x28], eax
mov eax, dword [ebp - 0x24]
sub eax, ecx
mov dword [ebp - 4], ecx
mov dword [ebp - 0x2c], eax
mov dword [ebp - 0x1c], ebx
mov ecx, dword [ebp - 4]
mov eax, dword [ebp - 0x28]
add eax, ecx
cdq
idiv ebx
mov eax, dword [esi + edx*4 + 0x454]
mov edx, dword [ebp - 0x2c]
sar eax, 8
and eax, edi
mov dword [ebp - 0x30], eax
lea eax, [edx + ecx]
cdq
idiv ebx
mov ecx, dword [ebp - 0x30]
mov ecx, dword [ecx*4 + 0x5b6a80]
mov eax, dword [esi + edx*4 + 0x454]
and eax, edi
xor ecx, dword [eax*4 + 0x5b6e80]
mov eax, dword [ebp - 4]
cdq
idiv ebx
movsx eax, word [esi + edx*4 + 0x456]
and eax, edi
xor ecx, dword [eax*4 + 0x5b6680]
mov eax, dword [ebp - 0x18]
movzx edx, byte [eax + 0x23]
xor ecx, dword [edx*4 + 0x5b6280]
mov edx, dword [ebp - 0xc]
xor ecx, dword [edx]
add dword [ebp - 0xc], 4
mov dword [eax], ecx
add eax, 4
inc dword [ebp - 4]
dec dword [ebp - 0x1c]
mov dword [ebp - 0x18], eax
jne 0x42096f
mov eax, ebx
shl eax, 2
push eax
lea eax, [esi + 0x434]
push eax
lea eax, [esi + 0x454]
push eax
call fcn.0055bea0
add dword [ebp - 0x10], 0x20
add esp, 0xc
inc dword [ebp - 0x14]
mov eax, dword [ebp - 0x14]
cmp eax, dword [esi + 0x3d0]
jl 0x42093f
and dword [ebp - 4], 0
test ebx, ebx
jle 0x420aea
mov eax, dword [ebp - 8]
mov ecx, dword [ebp + 8]
mov dword [ebp + 8], eax
lea eax, [esi + 0x454]
mov dword [ebp - 0x10], eax
mov eax, dword [ebp - 0x20]
sub eax, dword [ebp - 8]
mov dword [ebp - 0x30], eax
mov eax, dword [ebp - 0x24]
sub eax, dword [ebp - 8]
mov dword [ebp - 0x2c], eax
mov eax, dword [esi + 0x3d0]
mov edx, dword [ebp - 4]
lea eax, [edx + eax*8]
mov eax, dword [esi + eax*4 + 8]
mov edx, dword [ebp - 0x10]
movzx edx, byte [edx + 3]
mov dword [ebp - 0x14], eax
sar eax, 0x18
xor al, byte [edx + str.cw]
mov edx, dword [ebp + 8]
mov byte [ecx], al
mov eax, dword [ebp - 0x30]
add eax, edx
cdq
idiv ebx
inc ecx
add dword [ebp - 0x10], 4
movsx eax, word [esi + edx*4 + 0x456]
mov edx, dword [ebp - 0x14]
and eax, edi
sar edx, 0x10
xor dl, byte [eax + str.cw]
mov eax, dword [ebp + 8]
mov byte [ecx], dl
cdq
idiv ebx
inc ecx
mov eax, dword [esi + edx*4 + 0x454]
mov edx, dword [ebp - 0x14]
sar eax, 8
and eax, edi
sar edx, 8
xor dl, byte [eax + str.cw]
mov eax, dword [ebp - 0x2c]
mov byte [ecx], dl
mov edx, dword [ebp + 8]
add eax, edx
cdq
idiv ebx
inc ecx
mov eax, dword [esi + edx*4 + 0x454]
and eax, edi
mov al, byte [eax + str.cw]
xor al, byte [ebp - 0x14]
mov byte [ecx], al
inc ecx
inc dword [ebp - 4]
inc dword [ebp + 8]
cmp dword [ebp - 4], ebx
jl 0x420a4c
pop ebx
pop edi
pop esi
leave
ret 4