Function at 0x51f409
Capabilities:
Encode data using xor

Disassembly:
push ecx
mov ecx, dword [esp + 0x10]
push ebx
mov ebx, dword [esp + 0xc]
push ebp
mov ebp, dword [esp + 0x1c]
push esi
cmp dword [ebx + 0xe8], 0
push edi
mov dword [esp + 0x10], ecx
je 0x51f432
mov eax, dword [ebx + 0x84]
sub eax, ecx
dec eax
jmp 0x51f434
mov eax, ecx
mov esi, dword [ebx + 0xcc]
mov edi, esi
mov edx, dword [ebx + 0xd4]
imul edi, eax
mov eax, edx
imul eax, dword [esp + 0x1c]
add edi, eax
add edi, dword [ebx + 0xc8]
cmp dword [ebx + 0xe8], 0
je 0x51f45f
neg esi
cmp dword [ebx + 0xe0], 0
mov dword [esp + 0x18], esi
jne 0x51f811
cmp dword [ebx + 0xe4], 0
jne 0x51f811
mov eax, dword [ebx + 0xd8]
test al, 2
je 0x51f4b5
test ebp, ebp
je 0x51f834
mov al, byte [ebx + 0xf0]
xor byte [edi + 2], al
mov al, byte [ebx + 0xf4]
xor byte [edi + 1], al
mov al, byte [ebx + 0xf8]
xor byte [edi], al
add edi, esi
sub ebp, 1
jne 0x51f48f
jmp 0x51f834
test eax, 0x100
je 0x51f4f3
test ebp, ebp
je 0x51f834
mov al, byte [ebx + 0xf0]
mov byte [edi + 2], al
mov al, byte [ebx + 0xf4]
mov byte [edi + 1], al
mov al, byte [ebx + 0xf8]
mov byte [edi], al
mov al, byte [ebx + 0xfc]
mov byte [edi + 3], al
add edi, esi
sub ebp, 1
jne 0x51f4c4
jmp 0x51f834
test al, 8
je 0x51f51d
cmp edx, 4
jne 0x51f834
test ebp, ebp
je 0x51f834
mov al, byte [ebx + 0xfc]
mov byte [edi + 3], al
add edi, esi
sub ebp, 1
jne 0x51f508
jmp 0x51f834
test al, 0x10
je 0x51f6c0
test ebp, ebp
je 0x51f834
cmp edx, 4
jne 0x51f66c
movzx edx, byte [edi + 3]
lea ecx, [edi + 2]
mov esi, dword [ebx + 0xfc]
mov dword [esp + 0x1c], edx
test esi, esi
jne 0x51f550
movzx eax, byte [ecx]
jmp 0x51f595
mov dword [esp + 0x10], ecx
test edx, edx
jne 0x51f560
mov eax, dword [ebx + 0xf0]
jmp 0x51f58e
movzx eax, byte [ecx]
mov esi, dword [ebx + 0x100]
imul ecx, dword [ebx + 0xf0], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
add esi, ecx
mov ecx, dword [esp + 0x10]
cdq
idiv esi
mov edx, dword [esp + 0x1c]
mov byte [ecx], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x51f5a7
movzx eax, byte [edi + 1]
jmp 0x51f5e4
test edx, edx
jne 0x51f5b6
mov eax, dword [ebx + 0xf4]
cdq
idiv ecx
jmp 0x51f5e4
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 1]
imul ecx, dword [ebx + 0xf4], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi + 1], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x51f5f6
movzx eax, byte [edi]
jmp 0x51f636
mov edx, dword [esp + 0x1c]
test edx, edx
jne 0x51f609
mov eax, dword [ebx + 0xf8]
cdq
idiv ecx
jmp 0x51f636
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi]
imul ecx, dword [ebx + 0xf8], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi], al
mov eax, dword [ebx + 0x100]
imul eax, dword [esp + 0x1c]
imul ecx, dword [ebx + 0xfc], 0xff
add eax, ecx
mov ecx, 0xff
cdq
idiv ecx
mov byte [edi + 3], al
add edi, dword [esp + 0x18]
sub ebp, 1
jne 0x51f536
jmp 0x51f834
mov ecx, 0xff
movzx eax, byte [edi + 2]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf0]
cdq
idiv ecx
mov byte [edi + 2], al
movzx eax, byte [edi + 1]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf4]
cdq
idiv ecx
mov byte [edi + 1], al
movzx eax, byte [edi]
imul eax, dword [ebx + 0x100]
add eax, dword [ebx + 0xf8]
cdq
idiv ecx
mov byte [edi], al
add edi, esi
sub ebp, 1
jne 0x51f671
jmp 0x51f834
test al, 0x20
je 0x51f7ea
cmp edx, 4
jne 0x51f7ea
test ebp, ebp
je 0x51f834
movzx edx, byte [edi + 3]
lea ecx, [edi + 2]
mov esi, dword [ebx + 0xfc]
mov dword [esp + 0x1c], edx
test esi, esi
jne 0x51f6f3
movzx eax, byte [ecx]
jmp 0x51f738
mov dword [esp + 0x10], ecx
test edx, edx
jne 0x51f703
mov eax, dword [ebx + 0xf0]
jmp 0x51f731
movzx eax, byte [ecx]
mov esi, dword [ebx + 0x100]
imul ecx, dword [ebx + 0xf0], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
add esi, ecx
mov ecx, dword [esp + 0x10]
cdq
idiv esi
mov edx, dword [esp + 0x1c]
mov byte [ecx], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x51f74a
movzx eax, byte [edi + 1]
jmp 0x51f787
test edx, edx
jne 0x51f759
mov eax, dword [ebx + 0xf4]
cdq
idiv ecx
jmp 0x51f787
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi + 1]
imul ecx, dword [ebx + 0xf4], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi + 1], al
mov ecx, dword [ebx + 0xfc]
test ecx, ecx
jne 0x51f799
movzx eax, byte [edi]
jmp 0x51f7d9
mov edx, dword [esp + 0x1c]
test edx, edx
jne 0x51f7ac
mov eax, dword [ebx + 0xf8]
cdq
idiv ecx
jmp 0x51f7d9
mov esi, dword [ebx + 0x100]
movzx eax, byte [edi]
imul ecx, dword [ebx + 0xf8], 0xff
imul eax, esi
imul esi, edx
imul eax, edx
add eax, ecx
imul ecx, dword [ebx + 0xfc], 0xff
cdq
add esi, ecx
idiv esi
mov byte [edi], al
add edi, dword [esp + 0x18]
sub ebp, 1
jne 0x51f6d9
jmp 0x51f834
test ebp, ebp
je 0x51f834
mov al, byte [ebx + 0xf0]
mov byte [edi + 2], al
mov al, byte [ebx + 0xf4]
mov byte [edi + 1], al
mov al, byte [ebx + 0xf8]
mov byte [edi], al
add edi, esi
sub ebp, 1
jne 0x51f7ee
jmp 0x51f834
test ebp, ebp
je 0x51f834
push edi
push ecx
push dword [esp + 0x24]
push ebx
call fcn.0051ead2
mov ecx, dword [esp + 0x20]
add esp, 0x10
add edi, esi
inc ecx
mov dword [esp + 0x10], ecx
sub ebp, 1
jne 0x51f815
pop edi
pop esi
pop ebp
pop ebx
pop ecx
ret