Function at 0x100403b0
Capabilities:
Validate payment card number using luhn algorithm

Disassembly:
sub esp, 0x10
push ebx
mov ebx, dword [esp + 0x1c]
push ebp
mov ebp, dword [esp + 0x30]
push esi
push edi
mov edi, dword [esp + 0x24]
mov dword [ebp], 0
mov al, byte [ebx]
cmp al, 0xa
je 0x10040923
cmp al, 0xd
je 0x10040923
mov ecx, dword [edi + 0xc4]
mov esi, 4
mov ebp, dword [esp + 0x2c]
lea eax, [ecx + 1]
mov dword [edi + 0xc4], eax
test ecx, ecx
jne 0x10040845
mov dword [edi + 0xd0], 0
mov eax, dword [edi + 0x18]
mov eax, dword [eax + 0x2ac]
mov eax, dword [eax + 0x48]
test al, 3
je 0x100405c8
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x10040432
cmp al, 0x20
je 0x1004042a
cmp al, 9
jne 0x10040432
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x10040422
push 5
push str.HTTP_
push esi
call dword [sym.imp.api_ms_win_crt_string_l1_1_0.dll_strncmp]
add esp, 0xc
test eax, eax
jne 0x100404f6
movsx ecx, byte [esi + 5]
mov eax, ecx
sub eax, 0x31
je 0x10040523
sub eax, 1
je 0x1004047f
sub eax, 1
je 0x1004047f
push str.Unsupported_HTTP_version_in_response
push edi
call fcn.1002f150
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov al, byte [esi + 6]
cmp al, 0x20
je 0x1004048a
cmp al, 9
jne 0x100404f6
lea eax, [ecx - 0x30]
lea eax, [eax + eax*4]
add eax, eax
mov dword [edi + 0xd0], eax
mov cl, byte [esi + 7]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x100404f6
mov dl, byte [esi + 8]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x100404f6
mov dh, byte [esi + 9]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x100404f6
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xa]
cmp al, 0x20
je 0x100406a6
cmp al, 9
je 0x100406a6
cmp al, 0xa
jl 0x100404f6
cmp al, 0xd
jle 0x100406a6
push ebp
push ebx
push edi
call fcn.1003f7b0
add esp, 0xc
cmp eax, 1
jne 0x10040871
mov dword [edi + 0xd4], 0xc8
mov dword [edi + 0xd0], 0xa
jmp 0x100406a6
cmp byte [esi + 6], 0x2e
jne 0x100405ad
mov al, byte [esi + 7]
cmp al, 0x30
je 0x10040538
cmp al, 0x31
jne 0x100405ad
mov cl, byte [esi + 8]
cmp cl, 0x20
je 0x10040545
cmp cl, 9
jne 0x100405ad
movsx eax, al
sub eax, 0x26
mov dword [edi + 0xd0], eax
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x100405ad
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x100405ad
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x100405ad
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xc]
cmp al, 0x20
je 0x100406a6
cmp al, 9
je 0x100406a6
sub al, 0xa
cmp al, 3
jbe 0x100406a6
push str.Unsupported_HTTP_1_subversion_in_response
push edi
call fcn.1002f150
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
test eax, 0x40000
je 0x10040871
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x100405f0
nop dword [eax + eax]
cmp al, 0x20
je 0x100405e8
cmp al, 9
jne 0x100405f0
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x100405e0
push 5
push str.RTSP_
push esi
call dword [sym.imp.api_ms_win_crt_string_l1_1_0.dll_strncmp]
add esp, 0xc
test eax, eax
jne 0x10040871
mov al, byte [esi + 5]
sub al, 0x30
cmp al, 9
ja 0x10040878
cmp byte [esi + 6], 0x2e
jne 0x10040878
mov al, byte [esi + 7]
sub al, 0x30
cmp al, 9
ja 0x10040878
mov al, byte [esi + 8]
cmp al, 0x20
je 0x1004063c
cmp al, 9
jne 0x10040878
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x10040878
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x10040878
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x10040878
movsx eax, cl
lea ecx, [eax + eax*4]
movsx eax, dl
lea eax, [eax + ecx*2]
lea ecx, [eax + eax*4]
movsx eax, dh
lea eax, [eax + ecx*2]
add eax, 0xffffeb30
mov dword [edi + 0xd4], eax
mov al, byte [esi + 0xc]
cmp al, 0x20
je 0x1004069c
cmp al, 9
je 0x1004069c
sub al, 0xa
cmp al, 3
ja 0x10040878
mov dword [edi + 0xd0], 0xb
mov ecx, dword [edi + 0xd0]
mov eax, ecx
mov esi, dword [edi + 0x18]
sub eax, 0xa
je 0x100406d0
sub eax, 1
je 0x100406d0
mov eax, ecx
mov ecx, 0xa
cdq
idiv ecx
mov ecx, edx
mov edx, eax
mov eax, str.Unsupported_HTTP_version___u._d__in_response
jmp 0x1004070d
mov al, byte [esi + 0x514]
test al, al
je 0x10040726
movzx ecx, al
mov eax, 0xcccccccd
mul ecx
mov eax, 0x66666667
shr edx, 3
mov dword [esp + 0x24], edx
imul dword [edi + 0xd0]
sar edx, 2
mov ecx, edx
shr ecx, 0x1f
add ecx, edx
mov edx, dword [esp + 0x24]
cmp ecx, edx
je 0x10040726
mov eax, str.Version_mismatch__from_HTTP__u_to_HTTP__u_
push ecx
push edx
push eax
push edi
call fcn.1002f150
add esp, 0x10
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov eax, dword [edi + 0xd4]
mov dword [edi + 0xd10], eax
mov eax, dword [edi + 0xd0]
mov dword [edi + 0xd18], eax
movzx eax, byte [edi + 0xd0]
mov byte [esi + 0x514], al
mov al, byte [edi + 0xced]
test al, al
je 0x10040764
mov ecx, dword [edi + 0xd0]
movzx eax, al
cmp eax, ecx
jle 0x10040776
jmp 0x1004076a
mov cl, byte [edi + 0xd0]
mov byte [edi + 0xced], cl
mov ecx, dword [edi + 0xd0]
mov eax, dword [edi + 0xbd0]
or eax, dword [edi + 0xbd4]
je 0x100407a0
cmp byte [edi + 0xcee], 0
jne 0x100407a0
cmp dword [edi + 0xd4], 0x1a0
jne 0x100407a0
mov byte [edi + 0x132], 1
cmp ecx, 0xa
jne 0x100407bd
push str.HTTP_1.0__assume_close_after_body
push edi
call fcn.1002f220
push 1
push esi
call fcn.10031700
add esp, 0x10
jmp 0x100407e0
cmp ecx, 0x14
je 0x100407d4
cmp dword [edi + 0xdc], 2
jne 0x100407e0
cmp dword [edi + 0xd4], 0x65
jne 0x100407e0
mov eax, dword [esi + 0x4e8]
mov dword [eax], 2
mov ecx, dword [edi + 0xd4]
lea eax, [ecx - 0x64]
cmp eax, 0x63
setbe al
mov byte [edi + 0x133], al
sub ecx, 0xcc
je 0x10040811
sub ecx, 0x64
jne 0x10040840
cmp byte [edi + 0x3b0], cl
je 0x10040811
mov byte [edi + 0xdd0], 1
mov dword [edi + 0x88], 0
mov dword [edi + 0x8c], 0
mov dword [edi + 0x90], 0
mov dword [edi + 0x94], 0
mov byte [edi + 0x133], 1
mov esi, 0xc
push ebp
push 0
push ebx
call sub.VCRUNTIME140.dll_memchr
add esp, 0xc
test eax, eax
je 0x10040885
mov eax, str.Nul_byte_in_header
push eax
push edi
call fcn.1002f150
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov byte [edi + 0x129], 0
pop edi
pop esi
pop ebp
mov eax, 8
pop ebx
add esp, 0x10
ret
mov ecx, dword [edi + 0xc4]
cmp ecx, 2
jl 0x100408cb
mov al, byte [ebx]
cmp al, 0x20
je 0x1004089a
cmp al, 9
jne 0x1004089f
cmp ecx, 2
jg 0x100408cb
push ebp
push 0x3a
push ebx
call sub.VCRUNTIME140.dll_memchr
add esp, 0xc
test eax, eax
jne 0x100408cb
mov eax, str.Header_without_colon
push eax
push edi
call fcn.1002f150
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
push ebp
push ebx
push edi
call fcn.1003df20
add esp, 0xc
test eax, eax
jne 0x1004099e
push ebp
push ebx
push 1
push edi
call fcn.1002f0a0
mov eax, dword [edi + 0xd4]
add esp, 0x10
sub eax, 0x64
cmp eax, 0x64
jae 0x100408fc
or esi, 0x20
push ebp
push ebx
push esi
push edi
call fcn.100303f0
add esp, 0x10
test eax, eax
jne 0x1004099e
push eax
push ebp
push edi
call fcn.1003d560
add esp, 0xc
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov esi, dword [esp + 0x2c]
lea eax, [esi + 1]
push eax
lea eax, [esp + 0x14]
push eax
call fcn.10021760
push esi
lea eax, [esp + 0x1c]
push ebx
push eax
call fcn.10021720
add esp, 0x14
test eax, eax
jne 0x1004099e
lea eax, [edi + 0x878]
push eax
call fcn.10021780
add esp, 4
lea eax, [esp + 0x24]
push eax
push dword [esp + 0x38]
lea eax, [esp + 0x18]
push dword [esp + 0x38]
push eax
call fcn.10069cf0
add esp, 4
push eax
lea eax, [esp + 0x20]
push eax
call fcn.10021820
add esp, 4
push eax
push edi
call fcn.1003f900
mov ecx, dword [esp + 0x3c]
mov esi, eax
add dword [ebp], ecx
lea eax, [esp + 0x28]
push eax
call fcn.10021730
add esp, 0x1c
mov eax, esi
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret