Function at 0x51ff20
Capabilities:
Encode data using xor

Disassembly:
push ebp
mov ebp, eax
push edi
push esi
push ebx
sub esp, 0x5c
fld xword [esp + 0x70]
fld st(0)
fstp xword [esp + 0x28]
fxam
wait
fnstsw ax
and ax, 0x4500
cmp ax, 0x100
je 0x5203aa
movzx ebx, word [esp + 0x30]
mov esi, ebx
and esi, 0x8000
jne 0x520111
fxam
wait
fnstsw ax
fstp st(0)
and ax, 0x4500
cmp ax, 0x500
je 0x5203bc
and bx, 0x7fff
je 0x520194
mov eax, dword [esp + 0x28]
sub bx, 0x3fff
mov edx, dword [esp + 0x2c]
mov edi, dword [ebp + 0xc]
cmp edi, 0xe
mov dword [esp + 0xc], edi
jbe 0x520126
mov edi, edx
or edi, eax
je 0x5203cf
lea edi, [esp + 0x38]
mov dword [esp + 0x10], edi
mov esi, edi
mov dword [esp + 0xc], ebp
nop
mov ebp, eax
mov ecx, eax
and ebp, 0xf
mov edi, edx
xor ecx, ebp
or edi, ecx
je 0x5201f0
mov edi, dword [esp + 0xc]
mov ecx, dword [edi + 0xc]
test ecx, ecx
jle 0x51ffd8
mov edi, dword [esp + 0xc]
sub ecx, 1
mov dword [edi + 0xc], ecx
shrd eax, edx, 4
mov edi, esi
shr edx, 4
test ebp, ebp
jne 0x5201c7
cmp edi, dword [esp + 0x10]
ja 0x51fffc
mov ecx, dword [esp + 0xc]
mov esi, edi
mov ecx, dword [ecx + 0xc]
test ecx, ecx
js 0x520004
lea esi, [edi + 1]
lea ecx, [ebp + 0x30]
mov byte [edi], cl
mov edi, edx
or edi, eax
jne 0x51ffb0
cmp esi, dword [esp + 0x10]
mov edi, esi
mov ebp, dword [esp + 0xc]
je 0x520407
mov eax, dword [ebp + 4]
mov dword [esp + 0xc], eax
mov eax, dword [ebp + 8]
test eax, eax
mov dword [esp + 0x18], eax
jle 0x520359
mov edx, dword [ebp + 0xc]
mov eax, edi
movsx ebx, bx
sub eax, dword [esp + 0x10]
mov dword [esp + 0x14], ebx
test edx, edx
lea ecx, [eax + edx]
mov edx, dword [esp + 0xc]
cmovg eax, ecx
and edx, 0x1c0
cmp edx, 1
sbb edx, edx
lea esi, [eax + edx + 6]
mov eax, ebx
mov edx, 0x66666667
imul edx
mov eax, ebx
sar eax, 0x1f
sar edx, 2
sub edx, eax
mov ecx, edx
je 0x5203fa
mov ebx, 2
nop
lea esi, [esi]
mov eax, 0x66666667
add esi, 1
imul ecx
add ebx, 1
sar ecx, 0x1f
sar edx, 2
sub edx, ecx
mov ecx, edx
jne 0x520080
movsx eax, bx
mov dword [esp + 0x1c], eax
cmp dword [esp + 0x18], esi
jle 0x520240
mov eax, dword [esp + 0x18]
sub eax, esi
test dword [esp + 0xc], 0x600
jne 0x520378
lea edx, [eax - 1]
test eax, eax
mov dword [ebp + 8], edx
jle 0x520247
lea esi, [esi]
mov edx, ebp
mov eax, 0x20
call fcn.0051eff0
mov eax, dword [ebp + 8]
lea edx, [eax - 1]
test eax, eax
mov dword [ebp + 8], edx
jg 0x5200d0
mov eax, dword [ebp + 4]
mov dword [esp + 0xc], eax
test byte [esp + 0xc], 0x80
je 0x520252
nop
lea esi, [esi]
mov edx, ebp
mov eax, 0x2d
call fcn.0051eff0
jmp 0x52026b
or dword [ebp + 4], 0x80
jmp 0x51ff59
shld edx, eax, 1
add eax, eax
test edx, edx
jns 0x520120
shrd eax, edx, 1
mov esi, eax
mov eax, 0xe
sub eax, dword [esp + 0xc]
shr edx, 1
mov edi, edx
xor edx, edx
lea ecx, [eax*4]
mov eax, 4
shld edx, eax, cl
shl eax, cl
test cl, 0x20
je 0x520159
mov edx, eax
xor eax, eax
add esi, eax
adc edi, edx
test edi, edi
js 0x5203a2
shld edi, esi, 1
add esi, esi
mov eax, 0xf
mov edx, edi
sub eax, dword [esp + 0xc]
lea ecx, [eax*4]
mov eax, esi
shr edx, cl
xor esi, esi
shrd eax, edi, cl
and ecx, 0x20
cmovne eax, edx
cmovne edx, esi
jmp 0x51ffa0
mov edx, dword [esp + 0x2c]
mov eax, dword [esp + 0x28]
mov ebx, edx
or ebx, eax
je 0x52036d
test edx, edx
js 0x520410
mov ecx, 0xffffc001
shld edx, eax, 1
mov ebx, ecx
add eax, eax
sub ecx, 1
test edx, edx
jns 0x5201b3
jmp 0x51ff86
cmp ebp, 9
lea esi, [edi + 1]
jbe 0x51ffff
lea ecx, [ebp + 0x37]
mov ebp, dword [esp + 0xc]
mov ebp, dword [ebp + 4]
mov dword [esp + 0x14], ebp
movzx ebp, byte [esp + 0x14]
and ebp, 0x20
or ecx, ebp
jmp 0x520002
cmp esi, dword [esp + 0x10]
ja 0x520210
mov edi, dword [esp + 0xc]
test byte [edi + 5], 8
jne 0x520210
mov ecx, dword [esp + 0xc]
mov edi, esi
mov ecx, dword [ecx + 0xc]
test ecx, ecx
jle 0x520216
lea esi, [esi]
lea edi, [esi + 1]
mov byte [esi], 0x2e
mov ecx, eax
xor ecx, 1
or ecx, edx
je 0x520236
lea ecx, [ebx - 1]
shrd eax, edx, 1
mov ebx, ecx
mov esi, eax
shr edx, 1
xor esi, 1
or esi, edx
lea ecx, [ebx - 1]
jne 0x520222
xor eax, eax
xor edx, edx
jmp 0x51ffe1
mov dword [ebp + 8], 0xffffffff
test byte [esp + 0xc], 0x80
jne 0x520100
test dword [esp + 0xc], 0x100
jne 0x520380
test byte [esp + 0xc], 0x40
jne 0x520391
mov edx, ebp
mov eax, 0x30
call fcn.0051eff0
mov eax, dword [ebp + 4]
mov edx, ebp
and eax, 0x20
or eax, 0x58
call fcn.0051eff0
mov eax, dword [ebp + 8]
test eax, eax
jle 0x5202b9
test byte [ebp + 5], 2
je 0x5202b9
sub eax, 1
mov dword [ebp + 8], eax
lea esi, [esi]
mov edx, ebp
mov eax, 0x30
call fcn.0051eff0
mov eax, dword [ebp + 8]
lea edx, [eax - 1]
test eax, eax
mov dword [ebp + 8], edx
jg 0x5202a0
cmp edi, dword [esp + 0x10]
mov ebx, dword [esp + 0x10]
ja 0x5202e7
jmp 0x52030e
movzx eax, word [ebp + 0x1c]
test ax, ax
mov word [esp + 0x26], ax
je 0x5202e3
mov ecx, ebp
mov edx, 1
lea eax, [esp + 0x26]
call fcn.0051f2f0
cmp edi, ebx
je 0x52030e
sub edi, 1
movsx eax, byte [edi]
cmp eax, 0x2e
je 0x520350
cmp eax, 0x2c
je 0x5202c5
mov edx, ebp
call fcn.0051eff0
nop
jmp 0x5202e3
mov edx, ebp
mov eax, 0x30
call fcn.0051eff0
mov eax, dword [ebp + 0xc]
lea edx, [eax - 1]
test eax, eax
mov dword [ebp + 0xc], edx
jg 0x520302
mov eax, dword [ebp + 4]
mov edx, ebp
and eax, 0x20
or eax, 0x50
call fcn.0051eff0
mov eax, dword [esp + 0x1c]
mov ecx, ebp
add dword [ebp + 8], eax
mov eax, dword [esp + 0x14]
or dword [ebp + 4], 0x1c0
cdq
call fcn.0051f950
add esp, 0x5c
pop ebx
pop esi
pop edi
pop ebp
ret
mov eax, ebp
call fcn.0051f260
jmp 0x5202e3
movsx eax, bx
mov dword [esp + 0x1c], 2
mov dword [esp + 0x14], eax
jmp 0x520247
xor ebx, ebx
xor eax, eax
xor edx, edx
jmp 0x51ff86
mov dword [ebp + 8], eax
jmp 0x520247
mov edx, ebp
mov eax, 0x2b
call fcn.0051eff0
jmp 0x52026b
mov edx, ebp
mov eax, 0x20
call fcn.0051eff0
jmp 0x52026b
add ebx, 1
jmp 0x52016b
fstp st(0)
mov ecx, ebp
mov edx, 0x59200f
xor eax, eax
call fcn.0051f1d0
jmp 0x520345
mov ecx, ebp
mov edx, 0x592013
mov eax, esi
call fcn.0051f1d0
jmp 0x520345
lea eax, [esp + 0x38]
mov dword [esp + 0x10], eax
mov edx, dword [esp + 0xc]
mov eax, dword [ebp + 4]
test edx, edx
jle 0x52041a
mov dword [esp + 0xc], eax
mov byte [esp + 0x38], 0x2e
lea eax, [esp + 0x39]
lea edi, [eax + 1]
mov byte [eax], 0x30
jmp 0x520021
mov dword [esp + 0x1c], 2
jmp 0x5200a0
mov eax, dword [ebp + 0xc]
mov dword [esp + 0xc], eax
jmp 0x5203d7
mov ebx, 0xffffc002
jmp 0x51ff86
mov edx, eax
and dh, 8
mov dword [esp + 0xc], eax
mov eax, dword [esp + 0x10]
je 0x5203ef
jmp 0x5203e6