Function at 0x53c990
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 0x53cf07
cmp al, 0xd
je 0x53cf07
mov ecx, dword [edi + 0xc4]
lea ebp, [edi + 0xc4]
mov esi, 4
lea eax, [ecx + 1]
mov dword [ebp], eax
test ecx, ecx
jne 0x53ce21
mov dword [edi + 0xd0], ecx
mov eax, dword [edi + 0x18]
mov eax, dword [eax + 0x29c]
mov eax, dword [eax + 0x48]
test al, 3
je 0x53cba9
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x53ca11
nop dword [eax]
cmp al, 0x20
je 0x53ca09
cmp byte [esi], 9
jne 0x53ca11
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x53ca00
push 5
push str.HTTP_
push esi
call fcn.006f65d0
add esp, 0xc
test eax, eax
jne 0x53cad4
movsx ecx, byte [esi + 5]
mov eax, ecx
sub eax, 0x31
je 0x53cb04
sub eax, 1
je 0x53ca5d
sub eax, 1
je 0x53ca5d
push str.Unsupported_HTTP_version_in_response
push edi
call fcn.0052b8c0
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 0x53ca68
cmp al, 9
jne 0x53cad4
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 0x53cad4
mov dl, byte [esi + 8]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x53cad4
mov dh, byte [esi + 9]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x53cad4
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 0x53cc86
cmp al, 9
je 0x53cc86
cmp al, 0xa
jl 0x53cad4
cmp al, 0xd
jle 0x53cc86
push dword [esp + 0x2c]
push ebx
push edi
call fcn.0053be60
add esp, 0xc
cmp eax, 1
jne 0x53ce50
mov dword [edi + 0xd4], 0xc8
mov dword [edi + 0xd0], 0xa
jmp 0x53cc86
cmp byte [esi + 6], 0x2e
jne 0x53cb8e
mov al, byte [esi + 7]
cmp al, 0x30
je 0x53cb19
cmp al, 0x31
jne 0x53cb8e
mov cl, byte [esi + 8]
cmp cl, 0x20
je 0x53cb26
cmp cl, 9
jne 0x53cb8e
movsx eax, al
sub eax, 0x26
mov dword [edi + 0xd0], eax
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x53cb8e
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x53cb8e
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x53cb8e
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 0x53cc86
cmp al, 9
je 0x53cc86
sub al, 0xa
cmp al, 3
jbe 0x53cc86
push str.Unsupported_HTTP_1_subversion_in_response
push edi
call fcn.0052b8c0
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
test eax, 0x40000
je 0x53ce50
mov al, byte [ebx]
mov esi, ebx
test al, al
je 0x53cbd1
nop dword [eax]
cmp al, 0x20
je 0x53cbc9
cmp byte [esi], 9
jne 0x53cbd1
mov al, byte [esi + 1]
inc esi
test al, al
jne 0x53cbc0
push 5
push str.RTSP_
push esi
call fcn.006f65d0
add esp, 0xc
test eax, eax
jne 0x53ce50
mov al, byte [esi + 5]
sub al, 0x30
cmp al, 9
ja 0x53ce57
cmp byte [esi + 6], 0x2e
jne 0x53ce57
mov al, byte [esi + 7]
sub al, 0x30
cmp al, 9
ja 0x53ce57
mov al, byte [esi + 8]
cmp al, 0x20
je 0x53cc1c
cmp al, 9
jne 0x53ce57
mov cl, byte [esi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x53ce57
mov dl, byte [esi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x53ce57
mov dh, byte [esi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x53ce57
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 0x53cc7c
cmp al, 9
je 0x53cc7c
sub al, 0xa
cmp al, 3
ja 0x53ce57
mov dword [edi + 0xd0], 0xb
mov ecx, dword [edi + 0xd0]
mov eax, ecx
mov esi, dword [edi + 0x18]
sub eax, 0xa
je 0x53ccb0
sub eax, 1
je 0x53ccb0
mov eax, ecx
mov ecx, 0xa
cdq
idiv ecx
mov ebp, eax
mov ecx, edx
mov eax, str.Unsupported_HTTP_version___u._d__in_response
jmp 0x53cce7
mov al, byte [esi + 0x3e0]
test al, al
je 0x53cd00
movzx ecx, al
mov eax, 0xcccccccd
mul ecx
mov eax, 0x66666667
mov ebp, edx
imul dword [edi + 0xd0]
shr ebp, 3
sar edx, 2
mov ecx, edx
shr ecx, 0x1f
add ecx, edx
cmp ecx, ebp
je 0x53cd00
mov eax, str.Version_mismatch__from_HTTP__u_to_HTTP__u_
push ecx
push ebp
push eax
push edi
call fcn.0052b8c0
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 + 0xd50], eax
mov eax, dword [edi + 0xd0]
mov dword [edi + 0xd58], eax
movzx eax, byte [edi + 0xd0]
mov byte [esi + 0x3e0], al
mov al, byte [edi + 0xd2d]
test al, al
je 0x53cd3a
movzx eax, al
cmp eax, dword [edi + 0xd0]
jle 0x53cd46
mov al, byte [edi + 0xd0]
mov byte [edi + 0xd2d], al
mov eax, dword [edi + 0xc10]
or eax, dword [edi + 0xc14]
je 0x53cd70
cmp byte [edi + 0xd2e], 0
jne 0x53cd70
cmp dword [edi + 0xd4], 0x1a0
jne 0x53cd70
mov byte [edi + 0x132], 1
mov eax, dword [edi + 0xd0]
cmp eax, 0xa
jne 0x53cd93
push str.HTTP_1.0__assume_close_after_body
push edi
call fcn.0052b990
push 1
push esi
call fcn.0052de00
add esp, 0x10
jmp 0x53cdb6
cmp eax, 0x14
je 0x53cdaa
cmp dword [edi + 0xdc], 2
jne 0x53cdb6
cmp dword [edi + 0xd4], 0x65
jne 0x53cdb6
mov eax, dword [esi + 0x3b8]
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 0x53cde7
sub ecx, 0x64
jne 0x53ce16
cmp byte [edi + 0x3b0], cl
je 0x53cde7
mov byte [edi + 0xe10], 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
lea ebp, [edi + 0xc4]
push dword [esp + 0x2c]
push 0
push ebx
call fcn.006e0de0
add esp, 0xc
test eax, eax
je 0x53ce64
mov eax, str.Nul_byte_in_header
push eax
push edi
call fcn.0052b8c0
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 [ebp]
cmp ecx, 2
jl 0x53ceab
mov al, byte [ebx]
cmp al, 0x20
je 0x53ce76
cmp al, 9
jne 0x53ce7b
cmp ecx, 2
jg 0x53ceab
mov ebp, dword [esp + 0x2c]
push ebp
push 0x3a
push ebx
call fcn.006e0de0
add esp, 0xc
test eax, eax
jne 0x53ceaf
mov eax, str.Header_without_colon
push eax
push edi
call fcn.0052b8c0
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret
mov ebp, dword [esp + 0x2c]
push ebp
push ebx
push edi
call fcn.0053a710
add esp, 0xc
test eax, eax
jne 0x53cf82
push ebp
push ebx
push 1
push edi
call fcn.0052b820
mov eax, dword [edi + 0xd4]
add esp, 0x10
sub eax, 0x64
cmp eax, 0x64
jae 0x53cee0
or esi, 0x20
push ebp
push ebx
push esi
push edi
call fcn.0052cae0
add esp, 0x10
test eax, eax
jne 0x53cf82
push eax
push ebp
push edi
call fcn.00539d50
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.0051e8c0
push esi
lea eax, [esp + 0x1c]
push ebx
push eax
call fcn.0051e880
add esp, 0x14
test eax, eax
jne 0x53cf82
lea eax, [edi + 0x898]
push eax
call fcn.0051e900
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.0051e8e0
add esp, 4
push eax
lea eax, [esp + 0x20]
push eax
call fcn.0051e8f0
add esp, 4
push eax
push edi
call fcn.0053bfb0
mov ecx, dword [esp + 0x3c]
mov esi, eax
add dword [ebp], ecx
lea eax, [esp + 0x28]
push eax
call fcn.0051e890
add esp, 0x1c
mov eax, esi
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x10
ret