Function at 0x421b10
Capabilities:
Encode data using xor
Encrypt data using aes
Encrypt data using rc4 ksa
Reference aes constants

Disassembly:
sub esp, 0x30
push ebx
push ebp
mov ebp, ecx
push esi
push edi
mov al, byte [ebp + 4]
test al, al
jne 0x421b3d
push 0x4887d0
lea ecx, [esp + 0x38]
call fcn.0043b809
lea eax, [esp + 0x34]
push 0x47d818
push eax
call fcn.0043b8f8
mov eax, dword [ebp + 0x3cc]
cmp eax, 0x10
jne 0x421b63
mov ecx, dword [esp + 0x48]
mov edx, dword [esp + 0x44]
push ecx
push edx
mov ecx, ebp
call fcn.00421360
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x30
ret 8
cdq
and edx, 3
add eax, edx
mov ebx, eax
sar ebx, 2
cmp ebx, 4
jne 0x421b77
xor eax, eax
jmp 0x421b80
xor eax, eax
cmp ebx, 6
setne al
inc eax
shl eax, 5
test ebx, ebx
mov edx, dword [eax + 0x4739f4]
mov ecx, dword [eax + 0x4739fc]
mov eax, dword [eax + 0x473a04]
mov dword [esp + 0x30], edx
mov dword [esp + 0x20], eax
mov dword [esp + 0x14], ecx
lea eax, [ebp + 0x454]
jle 0x421c09
mov esi, dword [esp + 0x44]
lea ecx, [ebp + 8]
mov dword [esp + 0x10], ecx
mov dword [esp + 0x18], ebx
xor ecx, ecx
mov cl, byte [esi]
shl ecx, 0x18
mov dword [eax], ecx
mov edi, dword [eax]
inc esi
xor ecx, ecx
mov cl, byte [esi]
shl ecx, 0x10
or edi, ecx
inc esi
xor ecx, ecx
mov dword [eax], edi
mov ch, byte [esi]
or edi, ecx
inc esi
xor ecx, ecx
mov dword [eax], edi
mov cl, byte [esi]
mov edi, eax
or dword [eax], ecx
mov ecx, dword [esp + 0x10]
inc esi
add eax, 4
mov ecx, dword [ecx]
xor dword [edi], ecx
mov edi, dword [esp + 0x10]
mov ecx, dword [esp + 0x18]
add edi, 4
dec ecx
mov dword [esp + 0x10], edi
mov dword [esp + 0x18], ecx
jne 0x421bba
mov ecx, dword [esp + 0x14]
mov esi, dword [ebp + 0x3d0]
mov eax, 1
cmp esi, eax
mov dword [esp + 0x1c], eax
jle 0x421d1d
lea eax, [ebp + 0x28]
mov dword [esp + 0x44], eax
test ebx, ebx
jle 0x421ce7
mov eax, dword [esp + 0x44]
mov esi, edx
mov dword [esp + 0x18], eax
mov eax, ecx
mov ecx, dword [esp + 0x20]
sub eax, edx
sub ecx, edx
lea edi, [ebp + 0x434]
mov dword [esp + 0x28], eax
mov dword [esp + 0x24], ecx
mov dword [esp + 0x10], ebx
jmp 0x421c5f
mov ecx, dword [esp + 0x24]
mov eax, dword [esp + 0x28]
add eax, esi
add edi, 4
cdq
idiv ebx
mov eax, edx
xor edx, edx
mov dl, byte [ebp + eax*4 + 0x455]
lea eax, [ecx + esi]
mov dword [esp + 0x2c], edx
cdq
idiv ebx
mov eax, dword [ebp + edx*4 + 0x454]
mov edx, dword [esp + 0x2c]
and eax, 0xff
mov ecx, dword [edx*4 + 0x4711cc]
mov edx, dword [eax*4 + 0x4715cc]
mov eax, esi
xor ecx, edx
cdq
idiv ebx
xor eax, eax
mov al, byte [ebp + edx*4 + 0x456]
mov edx, dword [eax*4 + 0x470dcc]
xor ecx, edx
xor edx, edx
mov dl, byte [edi + 0x1f]
mov eax, dword [edx*4 + 0x4709cc]
xor ecx, eax
mov eax, dword [esp + 0x18]
mov edx, dword [eax]
add eax, 4
xor ecx, edx
mov dword [esp + 0x18], eax
mov eax, dword [esp + 0x10]
mov dword [edi - 4], ecx
inc esi
dec eax
mov dword [esp + 0x10], eax
jne 0x421c57
mov edx, dword [esp + 0x30]
mov eax, dword [esp + 0x1c]
mov ecx, ebx
lea esi, [ebp + 0x434]
lea edi, [ebp + 0x454]
rep movsd dword es:[edi], dword [esi]
mov esi, dword [esp + 0x44]
mov ecx, dword [ebp + 0x3d0]
inc eax
add esi, 0x20
cmp eax, ecx
mov ecx, dword [esp + 0x14]
mov dword [esp + 0x1c], eax
mov dword [esp + 0x44], esi
jl 0x421c27
test ebx, ebx
mov dword [esp + 0x44], 0
jle 0x421df6
mov esi, dword [esp + 0x48]
lea eax, [ebp + 0x454]
mov dword [esp + 0x48], eax
mov eax, dword [esp + 0x20]
sub edx, ecx
sub eax, ecx
mov edi, ecx
mov dword [esp + 0x30], edx
mov dword [esp + 0x2c], eax
mov eax, dword [ebp + 0x3d0]
mov ecx, dword [esp + 0x44]
lea edx, [ecx + eax*8]
xor eax, eax
mov ecx, dword [ebp + edx*4 + 8]
mov edx, dword [esp + 0x48]
mov al, byte [edx + 3]
mov edx, ecx
sar edx, 0x18
mov al, byte [eax + str.cw]
xor al, dl
mov edx, dword [esp + 0x30]
mov byte [esi], al
inc esi
lea eax, [edx + edi]
cdq
idiv ebx
xor eax, eax
mov al, byte [ebp + edx*4 + 0x456]
mov edx, ecx
sar edx, 0x10
mov al, byte [eax + str.cw]
xor al, dl
mov byte [esi], al
mov eax, edi
cdq
idiv ebx
xor eax, eax
inc esi
mov al, byte [ebp + edx*4 + 0x455]
mov edx, ecx
sar edx, 8
mov al, byte [eax + str.cw]
xor al, dl
mov edx, dword [esp + 0x2c]
mov byte [esi], al
inc esi
lea eax, [edx + edi]
cdq
idiv ebx
mov eax, dword [ebp + edx*4 + 0x454]
and eax, 0xff
mov dl, byte [eax + str.cw]
mov eax, dword [esp + 0x44]
xor dl, cl
mov ecx, dword [esp + 0x48]
mov byte [esi], dl
inc esi
inc eax
add ecx, 4
inc edi
cmp eax, ebx
mov dword [esp + 0x44], eax
mov dword [esp + 0x48], ecx
jl 0x421d4d
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x30
ret 8