Function at 0x580724
Capabilities:
Encode data using base64
Encrypt data using rc4 prga

Disassembly:
push ebp
mov ebp, esp
add esp, 0xffffffec
push ebx
push esi
push edi
mov dword [ebp - 0xc], ecx
mov dword [ebp - 8], edx
mov byte [ebp - 1], al
mov esi, dword [ebp + 8]
mov eax, dword [ebp - 0xc]
add eax, eax
add eax, eax
mov ecx, 3
cdq
idiv ecx
mov edx, eax
add edx, 4
mov ecx, esi
xor eax, eax
call sub.rtl120.bpl__System_StringOfChar_qqrci
cmp byte [ebp - 1], 0
jne 0x580784
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
movzx edx, byte [ebp - 0xc]
dec edx
and dl, 0x3f
add dl, 0x21
mov byte [eax], dl
mov eax, dword [ebp - 0xc]
add eax, 2
mov ecx, 3
cdq
idiv ecx
lea eax, [eax + eax*2]
mov dword [ebp - 0xc], eax
mov edi, 2
xor eax, eax
mov dword [ebp - 0x10], eax
xor ebx, ebx
movzx eax, byte [ebp - 1]
sub al, 1
jb 0x58079e
sub al, 2
jb 0x5807a5
jmp 0x5807aa
mov ebx, 2
jmp 0x5807aa
mov ebx, 1
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov byte [eax + ebx - 1], 0
mov eax, dword [ebp - 0x10]
cmp eax, dword [ebp - 0xc]
jge 0x58088e
test edi, edi
jle 0x580806
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
lea eax, [eax + ebx - 1]
push eax
mov ecx, edi
mov eax, 0x3f
shl eax, cl
mov edx, dword [ebp - 8]
mov ecx, dword [ebp - 0x10]
movzx edx, byte [edx + ecx]
and eax, edx
mov ecx, edi
shr eax, cl
mov edx, dword [esi]
or al, byte [edx + ebx - 1]
pop edx
mov byte [edx], al
sub edi, 6
inc ebx
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov byte [eax + ebx - 1], 0
jmp 0x580882
test edi, edi
jge 0x58084c
mov eax, edi
cdq
xor eax, edx
sub eax, edx
mov edi, eax
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
lea eax, [eax + ebx - 1]
push eax
mov ecx, edi
mov eax, 0x3f
shr eax, cl
mov edx, dword [ebp - 8]
mov ecx, dword [ebp - 0x10]
and al, byte [edx + ecx]
mov ecx, edi
shl al, cl
mov edx, dword [esi]
or al, byte [edx + ebx - 1]
pop edx
mov byte [edx], al
mov eax, 8
sub eax, edi
mov edi, eax
inc dword [ebp - 0x10]
jmp 0x580882
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov edx, dword [ebp - 8]
mov ecx, dword [ebp - 0x10]
movzx edx, byte [edx + ecx]
and dl, 0x3f
mov ecx, dword [esi]
movzx ecx, byte [ecx + ebx - 1]
or dl, cl
mov byte [eax + ebx - 1], dl
inc ebx
inc dword [ebp - 0x10]
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov byte [eax + ebx - 1], 0
mov edi, 2
mov eax, dword [ebp - 0x10]
cmp eax, dword [ebp - 0xc]
jl 0x5807c2
movzx eax, byte [ebp - 1]
sub al, 1
jb 0x58089f
sub al, 2
jb 0x5808d9
jmp 0x580921
cmp edi, 2
jne 0x5808a5
dec ebx
mov eax, ebx
sub eax, 2
jl 0x580921
inc eax
mov dword [ebp - 0x14], eax
mov edi, 2
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov edx, dword [esi]
movzx edx, byte [edx + edi - 1]
mov ecx, dword [0x59e334]
movzx edx, byte [ecx + edx]
mov byte [eax + edi - 1], dl
inc edi
dec dword [ebp - 0x14]
jne 0x5808b5
jmp 0x580921
cmp edi, 2
jne 0x5808df
dec ebx
test ebx, ebx
jle 0x58091c
mov dword [ebp - 0x14], ebx
mov edi, 1
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov edx, dword [esi]
movzx edx, byte [edx + edi - 1]
mov ecx, dword [0x59e338]
movzx edx, byte [ecx + edx]
mov byte [eax + edi - 1], dl
inc edi
dec dword [ebp - 0x14]
jne 0x5808eb
jmp 0x58091c
inc ebx
mov eax, esi
call sub.rtl120.bpl__System__UniqueStringA_qqrr27System__AnsiStringT_us_i0__
mov byte [eax + ebx - 1], 0x3d
test bl, 3
jne 0x58090f
mov eax, esi
xor ecx, ecx
mov edx, ebx
call sub.rtl120.bpl__System__LStrSetLength_qqrv
pop edi
pop esi
pop ebx
mov esp, ebp
pop ebp
ret 4