Function at 0x43c580
Capabilities:
Encode data using base64

Disassembly:
sub esp, 0x60
mov eax, dword [0x4c84d4]
xor eax, esp
mov dword [esp + 0x5c], eax
mov eax, dword [esp + 0x64]
fnstcw word [esp + 2]
push ebx
push ebp
push esi
mov ebp, dword [eax + 4]
push edi
mov ecx, 0x10
mov esi, str.ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_
lea edi, [esp + 0x28]
rep movsd dword es:[edi], dword [esi]
mov ecx, dword [eax + 8]
movzx eax, word [esp + 0x12]
mov dword [esp + 0x14], ecx
or eax, 0xc00
mov dword [esp + 0x20], eax
fild dword [esp + 0x14]
mov ebx, dword [esp + 0x78]
mov ecx, 1
mov eax, 0x38e38e39
fdiv qword [0x4b54b8]
movsb byte es:[edi], byte [esi]
xor edi, edi
mov dword [esp + 0x18], ebx
mov dword [esp + 0x1c], ebp
fldcw word [esp + 0x20]
fistp qword [esp + 0x20]
mov edx, dword [esp + 0x20]
sub ecx, edx
fldcw word [esp + 0x12]
mul ecx
mov eax, dword [ebx]
shr edx, 4
lea ecx, [ecx + edx*2 + 2]
sub eax, 0x10
mov edx, 1
sub edx, dword [eax + 0xc]
mov eax, dword [eax + 8]
sub eax, ecx
or edx, eax
jge 0x43c61e
push ecx
mov ecx, ebx
call fcn.00408590
mov esi, dword [ebx]
xor ecx, ecx
cmp dword [esp + 0x14], edi
jle 0x43c6e4
lea esp, [esp]
mov al, byte [edi + ebp]
movzx edx, al
mov ebx, edx
shr ebx, 2
mov bl, byte [esp + ebx + 0x28]
mov byte [esi + ecx], bl
add edi, 1
add ecx, 1
cmp edi, dword [esp + 0x14]
jge 0x43c6fe
mov bl, byte [edi + ebp]
movzx eax, bl
and edx, 3
mov ebp, eax
shl edx, 4
shr ebp, 4
or ebp, edx
mov dl, byte [esp + ebp + 0x28]
mov byte [esi + ecx], dl
add edi, 1
add ecx, 1
cmp edi, dword [esp + 0x14]
jge 0x43c758
mov ebp, dword [esp + 0x1c]
mov dl, byte [edi + ebp]
and eax, 0xf
movzx edx, dl
add eax, eax
mov ebx, edx
add eax, eax
shr ebx, 6
or ebx, eax
mov al, byte [esp + ebx + 0x28]
mov byte [esi + ecx], al
and edx, 0x3f
movzx edx, byte [esp + edx + 0x28]
add ecx, 1
mov byte [esi + ecx], dl
add ecx, 1
mov eax, 0x38e38e39
mul ecx
shr edx, 4
lea eax, [edx + edx*8]
add eax, eax
add eax, eax
add eax, eax
mov edx, ecx
add edi, 1
sub edx, eax
jne 0x43c6d6
mov byte [esi + ecx], 0xd
add ecx, 1
mov byte [esi + ecx], 0xa
add ecx, 1
cmp edi, dword [esp + 0x14]
jl 0x43c630
mov ebx, dword [esp + 0x18]
mov byte [esi + ecx], 0x3d
mov byte [esi + ecx + 1], 0
mov esi, dword [ebx]
test esi, esi
jne 0x43c78c
xor eax, eax
jmp 0x43c79e
and eax, 3
shl eax, 4
mov al, byte [esp + eax + 0x28]
mov byte [esi + ecx], al
add ecx, 1
mov byte [esi + ecx], 0x3d
add ecx, 1
mov byte [esi + ecx], 0x3d
mov byte [esi + ecx + 1], 0
mov esi, dword [esp + 0x18]
mov ecx, dword [esi]
test ecx, ecx
jne 0x43c72c
xor eax, eax
jmp 0x43c73e
mov eax, ecx
lea edi, [eax + 1]
mov dl, byte [eax]
add eax, 1
test dl, dl
jne 0x43c731
sub eax, edi
js 0x43c74e
cmp eax, dword [ecx - 8]
jg 0x43c74e
mov dword [ecx - 0xc], eax
mov ecx, dword [esi]
mov byte [eax + ecx], 0
jmp 0x43c7ac
push 0x80070057
call fcn.00408510
and ebx, 0xf
mov dl, byte [esp + ebx*4 + 0x28]
mov byte [esi + ecx], dl
add ecx, 1
mov byte [esi + ecx], 0x3d
mov byte [esi + ecx + 1], 0
mov esi, dword [esp + 0x18]
mov ecx, dword [esi]
test ecx, ecx
jne 0x43c77c
xor eax, eax
jmp 0x43c73e
mov eax, ecx
lea edi, [eax + 1]
mov dl, byte [eax]
add eax, 1
test dl, dl
jne 0x43c781
jmp 0x43c73a
mov eax, esi
lea edx, [eax + 1]
mov cl, byte [eax]
add eax, 1
test cl, cl
jne 0x43c791
sub eax, edx
js 0x43c74e
cmp eax, dword [esi - 8]
jg 0x43c74e
mov dword [esi - 0xc], eax
mov edx, dword [ebx]
mov byte [eax + edx], 0
mov ecx, dword [esp + 0x6c]
pop edi
pop esi
pop ebp
pop ebx
xor ecx, esp
mov eax, 1
call fcn.0047d992
add esp, 0x60
ret 8