Function at 0x4051c0
Capabilities:
Encode data using xor
Encrypt data using aes
Encrypt data using rc4 ksa
Reference aes constants

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x14
cmp dword [ebp + 8], 0
push ebx
push esi
push edi
mov esi, ecx
jne 0x4051f2
lea eax, [ebp + 8]
push eax
lea ecx, [ebp - 0x14]
mov dword [ebp + 8], str.Empty_key
call fcn.00434109
push 0x454a08
lea ecx, [ebp - 0x14]
push ecx
call fcn.0043431d
mov ecx, dword [ebp + 0x10]
cmp ecx, 0x10
je 0x405225
cmp ecx, 0x18
je 0x405225
cmp ecx, 0x20
je 0x405225
lea edx, [ebp + 8]
push edx
lea ecx, [ebp - 0x14]
mov dword [ebp + 8], str.Incorrect_key_length
call fcn.00434109
push 0x454a08
lea eax, [ebp - 0x14]
push eax
call fcn.0043431d
mov eax, dword [ebp + 0x14]
cmp eax, 0x10
je 0x405258
cmp eax, 0x18
je 0x405258
cmp eax, 0x20
je 0x405258
lea ecx, [ebp + 8]
push ecx
lea ecx, [ebp - 0x14]
mov dword [ebp + 8], str.Incorrect_block_length
call fcn.00434109
push 0x454a08
lea edx, [ebp - 0x14]
push edx
call fcn.0043431d
mov edi, dword [ebp + 0xc]
push eax
mov dword [esi + 0x3cc], eax
lea eax, [esi + 0x3d4]
push edi
push eax
mov dword [esi + 0x3c8], ecx
call fcn.004339b0
mov ecx, dword [esi + 0x3cc]
push ecx
lea edx, [esi + 0x3f4]
push edi
push edx
call fcn.004339b0
mov eax, dword [esi + 0x3c8]
add esp, 0x18
cmp eax, 0x10
je 0x4052ba
cmp eax, 0x18
je 0x4052a8
mov dword [esi + 0x3d0], 0xe
jmp 0x4052de
xor eax, eax
cmp dword [esi + 0x3cc], 0x20
sete al
lea eax, [eax + eax + 0xc]
jmp 0x4052d8
mov eax, dword [esi + 0x3cc]
cmp eax, 0x10
jne 0x4052cc
mov eax, 0xa
jmp 0x4052d8
xor ecx, ecx
cmp eax, 0x18
setne cl
lea eax, [ecx + ecx + 0xc]
mov dword [esi + 0x3d0], eax
mov eax, dword [esi + 0x3cc]
cdq
and edx, 3
add edx, eax
sar edx, 2
xor ebx, ebx
mov dword [ebp + 0xc], edx
cmp dword [esi + 0x3d0], ebx
jl 0x40531c
lea edi, [esi + 8]
mov dword [ebp + 0x10], edi
test edx, edx
jle 0x40530a
mov ecx, edx
xor eax, eax
rep stosd dword es:[edi], eax
mov edi, dword [ebp + 0x10]
inc ebx
add edi, 0x20
mov dword [ebp + 0x10], edi
cmp ebx, dword [esi + 0x3d0]
jle 0x405300
xor ebx, ebx
cmp dword [esi + 0x3d0], ebx
jl 0x40534c
lea edi, [esi + 0x1e8]
mov dword [ebp + 0x10], edi
nop
test edx, edx
jle 0x40533a
mov ecx, edx
xor eax, eax
rep stosd dword es:[edi], eax
mov edi, dword [ebp + 0x10]
inc ebx
add edi, 0x20
mov dword [ebp + 0x10], edi
cmp ebx, dword [esi + 0x3d0]
jle 0x405330
mov eax, dword [esi + 0x3d0]
inc eax
imul eax, edx
mov dword [ebp + 0x10], eax
mov eax, dword [esi + 0x3c8]
cdq
and edx, 3
lea edi, [edx + eax]
mov eax, dword [ebp + 8]
sar edi, 2
mov dword [ebp - 8], edi
lea ecx, [esi + 0x414]
test edi, edi
jle 0x4053a9
mov edx, edi
jmp 0x405380
movzx ebx, byte [eax]
shl ebx, 0x18
mov dword [ecx], ebx
movzx ebx, byte [eax + 1]
shl ebx, 0x10
or dword [ecx], ebx
movzx ebx, byte [eax + 2]
shl ebx, 8
or dword [ecx], ebx
movzx ebx, byte [eax + 3]
or dword [ecx], ebx
add eax, 4
add ecx, 4
dec edx
jne 0x405380
xor ebx, ebx
mov dword [ebp + 8], ebx
test edi, edi
jle 0x405400
lea eax, [esi + 0x414]
mov dword [ebp + 8], eax
jmp 0x4053c0
cmp ebx, dword [ebp + 0x10]
jge 0x4053fd
mov eax, ebx
cdq
idiv dword [ebp + 0xc]
mov ecx, dword [ebp + 8]
mov ecx, dword [ecx]
inc ebx
mov dword [ebp + 0x14], eax
lea eax, [edx + eax*8]
mov dword [esi + eax*4 + 8], ecx
mov eax, dword [esi + 0x3d0]
sub eax, dword [ebp + 0x14]
lea ecx, [edx + eax*8]
mov eax, dword [ebp + 8]
mov edx, dword [eax]
add eax, 4
mov dword [esi + ecx*4 + 0x1e8], edx
mov dword [ebp + 8], eax
cmp ebx, edi
jl 0x4053c0
mov dword [ebp + 8], ebx
cmp ebx, dword [ebp + 0x10]
jge 0x40558a
mov dword [ebp + 0x14], 0x44b1f0
mov eax, dword [esi + edi*4 + 0x410]
mov ecx, eax
sar ecx, 0x10
and ecx, 0xff
movsx edx, byte [ecx + str.cw]
mov ecx, dword [ebp + 0x14]
movsx ecx, byte [ecx]
xor edx, ecx
inc dword [ebp + 0x14]
mov ecx, eax
sar ecx, 8
and ecx, 0xff
movzx ecx, byte [ecx + str.cw]
shl edx, 8
xor edx, ecx
mov ecx, eax
and ecx, 0xff
movzx ecx, byte [ecx + str.cw]
sar eax, 0x18
shl edx, 8
and eax, 0xff
movzx eax, byte [eax + str.cw]
xor edx, ecx
shl edx, 8
xor edx, eax
xor dword [esi + 0x414], edx
cmp edi, 8
je 0x4054a0
cmp edi, 1
jle 0x40552e
lea eax, [esi + 0x418]
lea ecx, [edi - 1]
mov edx, dword [eax - 4]
xor dword [eax], edx
add eax, 4
dec ecx
jne 0x405490
jmp 0x40552e
lea eax, [esi + 0x418]
mov ecx, 3
jmp 0x4054b0
mov edx, dword [eax - 4]
xor dword [eax], edx
add eax, 4
dec ecx
jne 0x4054b0
mov eax, dword [esi + 0x420]
mov ecx, eax
sar ecx, 0x18
and ecx, 0xff
movsx edx, byte [ecx + str.cw]
mov ecx, eax
sar ecx, 0x10
and ecx, 0xff
movzx ecx, byte [ecx + str.cw]
shl edx, 8
xor edx, ecx
mov ecx, eax
sar ecx, 8
and ecx, 0xff
movzx ecx, byte [ecx + str.cw]
shl edx, 8
and eax, 0xff
movzx eax, byte [eax + str.cw]
xor edx, ecx
shl edx, 8
xor edx, eax
xor dword [esi + 0x424], edx
lea eax, [esi + 0x428]
mov ecx, 3
mov edx, dword [eax - 4]
xor dword [eax], edx
add eax, 4
dec ecx
jne 0x405523
mov dword [ebp - 4], 0
test edi, edi
jle 0x405581
lea ecx, [esi + 0x414]
nop
cmp ebx, dword [ebp + 0x10]
jge 0x40558a
mov eax, ebx
cdq
idiv dword [ebp + 0xc]
mov ebx, dword [ecx]
add ecx, 4
lea edi, [edx + eax*8]
mov dword [esi + edi*4 + 8], ebx
mov edi, dword [esi + 0x3d0]
mov ebx, dword [ebp + 8]
sub edi, eax
lea eax, [edx + edi*8]
mov edx, dword [ecx - 4]
mov edi, dword [ebp - 8]
mov dword [esi + eax*4 + 0x1e8], edx
mov eax, dword [ebp - 4]
inc eax
inc ebx
mov dword [ebp - 4], eax
mov dword [ebp + 8], ebx
cmp eax, edi
jl 0x405540
cmp ebx, dword [ebp + 0x10]
jl 0x405410
mov eax, 1
mov dword [ebp + 8], eax
cmp dword [esi + 0x3d0], eax
jle 0x405615
lea ecx, [esi + 0x208]
mov dword [ebp + 0x10], ecx
mov edx, dword [ebp + 0xc]
test edx, edx
jle 0x4055fd
mov edi, edi
mov eax, dword [ecx]
mov edi, eax
sar edi, 0x18
and edi, 0xff
mov edi, dword [edi*4 + 0x44a1f0]
mov ebx, eax
sar ebx, 0x10
and ebx, 0xff
xor edi, dword [ebx*4 + 0x44a5f0]
mov ebx, eax
sar ebx, 8
and ebx, 0xff
xor edi, dword [ebx*4 + 0x44a9f0]
and eax, 0xff
xor edi, dword [eax*4 + 0x44adf0]
add ecx, 4
dec edx
mov dword [ecx - 4], edi
jne 0x4055b0
mov eax, dword [ebp + 8]
mov ecx, dword [ebp + 0x10]
inc eax
add ecx, 0x20
mov dword [ebp + 8], eax
mov dword [ebp + 0x10], ecx
cmp eax, dword [esi + 0x3d0]
jl 0x4055a7
pop edi
mov byte [esi + 4], 1
pop esi
pop ebx
mov esp, ebp
pop ebp
ret 0x10