Function at 0x4e39cb
Capabilities:
Encode data using xor
Generate random numbers using a mersenne twister

Disassembly:
push ebp
push ebx
push edi
push esi
sub esp, 0xc
mov edi, dword [esp + 0x24]
mov esi, dword [esp + 0x20]
lea ebx, [edi - 1]
nop word cs:[eax + eax]
cmp byte [ebx + 1], 0
lea ebx, [ebx + 1]
jne 0x4e39eb
sub ebx, edi
test edi, edi
je 0x4e3a33
mov eax, dword [esi + 0x18]
lea ebp, [esi + 4]
cmp eax, 0x10
jb 0x4e3a16
mov ecx, dword [ebp]
cmp ecx, edi
ja 0x4e3a33
cmp eax, 0x10
jb 0x4e3a1e
mov edx, dword [ebp]
jmp 0x4e3a20
mov ecx, ebp
cmp ecx, edi
jbe 0x4e3a0c
jmp 0x4e3a33
mov edx, ebp
mov ecx, dword [esi + 0x14]
add edx, ecx
cmp edx, edi
jbe 0x4e3a33
cmp eax, 0x10
jb 0x4e3a8b
mov edx, dword [ebp]
jmp 0x4e3a8d
sub esp, 4
push 0
push ebx
push esi
call fcn.004e22c3
add esp, 0x10
test al, al
je 0x4e3a81
mov eax, dword [esi + 0x18]
lea ebp, [esi + 4]
cmp eax, 0x10
jb 0x4e3a5a
mov ecx, dword [ebp]
test ebx, ebx
jne 0x4e3a60
jmp 0x4e3a71
mov ecx, ebp
test ebx, ebx
je 0x4e3a71
sub esp, 4
push ebx
push edi
push ecx
call 0x83c773
add esp, 0x10
mov eax, dword [esi + 0x18]
cmp eax, 0x10
jb 0x4e3a79
mov ebp, dword [ebp]
mov dword [esi + 0x14], ebx
mov byte [ebp + ebx], 0
mov eax, esi
add esp, 0xc
pop esi
pop edi
pop ebx
pop ebp
ret
mov edx, ebp
sub edi, edx
mov edx, ecx
sub edx, edi
jb 0x4e3b1a
cmp edx, ebx
ja 0x4e3a9f
mov ebx, edx
add ebx, edi
cmp ecx, ebx
jb 0x4e3b2a
cmp eax, 0xf
ja 0x4e3ab2
mov eax, ebp
jmp 0x4e3ab5
mov eax, dword [esi + 4]
mov dword [esi + 0x14], ebx
mov byte [eax + ebx], 0
mov ebx, dword [esi + 0x14]
cmp ebx, edi
jbe 0x4e3b01
test edi, edi
je 0x4e3a81
mov eax, dword [esi + 4]
mov ecx, dword [esi + 0x18]
cmp ecx, 0xf
mov edx, eax
ja 0x4e3ad6
mov edx, ebp
sub ebx, edi
je 0x4e3af0
add edi, edx
sub esp, 4
push ebx
push edi
push edx
call 0x83c88c
add esp, 0x10
mov eax, dword [esi + 4]
mov ecx, dword [esi + 0x18]
cmp ecx, 0xf
ja 0x4e3af7
mov eax, ebp
mov dword [esi + 0x14], ebx
add eax, ebx
mov byte [eax], 0
jmp 0x4e3a81
cmp dword [esi + 0x18], 0xf
jbe 0x4e3b0a
mov ebp, dword [esi + 4]
mov dword [esi + 0x14], 0
mov byte [ebp], 0
jmp 0x4e3a81
sub esp, 0xc
push 0x78d450
call 0x838d57
add esp, 0xc
sub esp, 0xc
push 0x78d450
call 0x838d57
add esp, 0xc
nop
push ebp
push ebx
push edi
push esi
sub esp, 8
mov ebp, dword [esp + 0x20]
mov eax, 0x80000000
mov edi, dword [esp + 0x24]
xor edi, eax
mov ecx, dword [esp + 0x28]
xor ecx, eax
sub ecx, edi
cmp ecx, 0xffffffff
je 0x4e3d46
mov dword [esp], edi
lea ebx, [ecx + 1]
mov edi, ecx
mov dword [esp + 4], edi
nop word cs:[eax + eax]
test edi, edi
je 0x4e3beb
mov eax, dword [ebp]
cmp eax, 0x270
jne 0x4e3bfb
mov ecx, dword [ebp + 4]
mov eax, 0xfffffd90
nop word cs:[eax + eax]
and ecx, 0x80000000
mov edx, dword [ebp + eax*4 + 0x9c8]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 0xff8]
xor edx, esi
mov dword [ebp + eax*4 + 0x1384], edx
inc eax
jne 0x4e3b9b
mov eax, dword [ebp]
jmp 0x4e3cd6
xor ecx, ecx
xor esi, esi
jmp 0x4e3d12
cmp eax, 0x4e0
jb 0x4e3cd6
mov ecx, dword [ebp + 0x9c4]
xor eax, eax
nop word cs:[eax + eax]
and ecx, 0x80000000
mov edx, dword [ebp + eax*4 + 0x9c8]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 0xff8]
xor edx, esi
mov dword [ebp + eax*4 + 4], edx
inc eax
cmp eax, 0xe3
jne 0x4e3c1b
mov ecx, dword [ebp + 0xd50]
mov eax, 0x80000000
and ecx, eax
xor eax, eax
nop word [eax + eax]
mov edx, dword [ebp + eax*4 + 0xd54]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 4]
xor edx, esi
mov dword [ebp + eax*4 + 0x390], edx
and ecx, 0x80000000
inc eax
cmp eax, 0x18c
jne 0x4e3c6b
mov eax, dword [ebp + 4]
mov edx, eax
and edx, 0x7ffffffe
or edx, ecx
shr edx, 1
and eax, 1
neg eax
and eax, 0x9908b0df
xor eax, dword [ebp + 0x634]
xor eax, edx
mov dword [ebp + 0x9c0], eax
mov dword [ebp], 0
xor eax, eax
lea ecx, [eax + 1]
mov dword [ebp], ecx
mov eax, dword [ebp + eax*4 + 4]
mov ecx, eax
shr ecx, 0xb
and ecx, dword [ebp + 0x1384]
xor ecx, eax
mov eax, ecx
shl eax, 7
and eax, 0x9d2c5680
xor eax, ecx
mov edx, eax
shl edx, 0xf
and edx, 0xefc60000
xor edx, eax
mov ecx, edx
shr ecx, 0x12
xor ecx, edx
mov esi, 0xffffffff
xor edx, edx
mov eax, ecx
div ebx
mov edi, eax
xor edx, edx
mov eax, esi
div ebx
cmp edi, eax
mov edi, dword [esp + 4]
jb 0x4e3d36
xor edx, edx
mov eax, esi
div ebx
cmp edx, edi
jne 0x4e3b7b
xor edx, edx
mov eax, ecx
div ebx
mov eax, edx
mov edi, dword [esp]
jmp 0x4e3ead
mov eax, dword [ebp]
cmp eax, 0x270
jne 0x4e3d9c
mov ecx, dword [ebp + 4]
mov eax, 0xfffffd90
nop dword [eax]
and ecx, 0x80000000
mov edx, dword [ebp + eax*4 + 0x9c8]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 0xff8]
xor edx, esi
mov dword [ebp + eax*4 + 0x1384], edx
inc eax
jne 0x4e3d5b
mov eax, dword [ebp]
jmp 0x4e3e76
cmp eax, 0x4e0
jb 0x4e3e76
mov ecx, dword [ebp + 0x9c4]
xor eax, eax
nop word cs:[eax + eax]
and ecx, 0x80000000
mov edx, dword [ebp + eax*4 + 0x9c8]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 0xff8]
xor edx, esi
mov dword [ebp + eax*4 + 4], edx
inc eax
cmp eax, 0xe3
jne 0x4e3dbb
mov ecx, 0x80000000
and ecx, dword [ebp + 0xd50]
xor eax, eax
nop dword [eax + eax]
mov edx, dword [ebp + eax*4 + 0xd54]
mov esi, edx
and esi, 0x7ffffffe
or esi, ecx
shr esi, 1
mov ecx, edx
and edx, 1
neg edx
and edx, 0x9908b0df
xor edx, dword [ebp + eax*4 + 4]
xor edx, esi
mov dword [ebp + eax*4 + 0x390], edx
and ecx, 0x80000000
inc eax
cmp eax, 0x18c
jne 0x4e3e0b
mov eax, dword [ebp + 4]
mov edx, eax
and edx, 0x7ffffffe
or edx, ecx
shr edx, 1
and eax, 1
neg eax
and eax, 0x9908b0df
xor eax, dword [ebp + 0x634]
xor eax, edx
mov dword [ebp + 0x9c0], eax
mov dword [ebp], 0
xor eax, eax
lea ecx, [eax + 1]
mov dword [ebp], ecx
mov eax, dword [ebp + eax*4 + 4]
mov ecx, eax
shr ecx, 0xb
and ecx, dword [ebp + 0x1384]
xor ecx, eax
mov eax, ecx
shl eax, 7
and eax, 0x9d2c5680
xor eax, ecx
mov ecx, eax
shl ecx, 0xf
and ecx, 0xefc60000
xor ecx, eax
mov eax, ecx
shr eax, 0x12
xor eax, ecx
add eax, edi
xor eax, 0x80000000
add esp, 8
pop esi
pop edi
pop ebx
pop ebp
ret