Function at 0x51a000
Capabilities:
Validate payment card number using luhn algorithm

Disassembly:
push ebx
mov ebx, dword [esp + 0xc]
push ebp
mov ebp, dword [esp + 0x14]
push esi
mov esi, dword [esp + 0x10]
push edi
mov edi, dword [esp + 0x28]
mov dword [edi], 0
mov al, byte [ebx]
cmp al, 0xa
je 0x51a55f
cmp al, 0xd
je 0x51a55f
mov ecx, dword [esi + 0xc4]
mov edi, 4
lea eax, [ecx + 1]
mov dword [esi + 0xc4], eax
test ecx, ecx
jne 0x51a48d
mov dword [esi + 0xd0], ecx
mov eax, dword [esi + 0x18]
mov eax, dword [eax + 0x260]
mov eax, dword [eax + 0x48]
test al, 3
je 0x51a210
mov al, byte [ebx]
mov edi, ebx
test al, al
je 0x51a080
nop word [eax + eax]
cmp al, 0x20
je 0x51a078
cmp al, 9
jne 0x51a080
mov al, byte [edi + 1]
inc edi
test al, al
jne 0x51a070
push 5
push str.HTTP_
push edi
call dword [sym.imp.api_ms_win_crt_string_l1_1_0.dll_strncmp]
add esp, 0xc
test eax, eax
jne 0x51a141
movsx ecx, byte [edi + 5]
mov eax, ecx
sub eax, 0x31
je 0x51a16e
sub eax, 1
je 0x51a0ca
sub eax, 1
je 0x51a0ca
push str.Unsupported_HTTP_version_in_response
push esi
call fcn.004f54f0
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
ret
mov al, byte [edi + 6]
cmp al, 0x20
je 0x51a0d5
cmp al, 9
jne 0x51a141
lea eax, [ecx - 0x30]
lea eax, [eax + eax*4]
add eax, eax
mov dword [esi + 0xd0], eax
mov cl, byte [edi + 7]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x51a141
mov dl, byte [edi + 8]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x51a141
mov dh, byte [edi + 9]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x51a141
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 [esi + 0xd4], eax
mov al, byte [edi + 0xa]
cmp al, 0x20
je 0x51a2e9
cmp al, 9
je 0x51a2e9
cmp al, 0xa
jl 0x51a141
cmp al, 0xd
jle 0x51a2e9
push ebp
push ebx
push esi
call fcn.00519450
add esp, 0xc
cmp eax, 1
jne 0x51a4b6
mov dword [esi + 0xd4], 0xc8
mov dword [esi + 0xd0], 0xa
jmp 0x51a2e9
cmp byte [edi + 6], 0x2e
jne 0x51a1f8
mov al, byte [edi + 7]
cmp al, 0x30
je 0x51a183
cmp al, 0x31
jne 0x51a1f8
mov cl, byte [edi + 8]
cmp cl, 0x20
je 0x51a190
cmp cl, 9
jne 0x51a1f8
movsx eax, al
sub eax, 0x26
mov dword [esi + 0xd0], eax
mov cl, byte [edi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x51a1f8
mov dl, byte [edi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x51a1f8
mov dh, byte [edi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x51a1f8
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 [esi + 0xd4], eax
mov al, byte [edi + 0xc]
cmp al, 0x20
je 0x51a2e9
cmp al, 9
je 0x51a2e9
sub al, 0xa
cmp al, 3
jbe 0x51a2e9
push str.Unsupported_HTTP_1_subversion_in_response
push esi
call fcn.004f54f0
add esp, 8
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
ret
test eax, 0x40000
je 0x51a4b6
mov al, byte [ebx]
mov edi, ebx
test al, al
je 0x51a233
cmp al, 0x20
je 0x51a22b
cmp al, 9
jne 0x51a233
mov al, byte [edi + 1]
inc edi
test al, al
jne 0x51a223
push 5
push str.RTSP_
push edi
call dword [sym.imp.api_ms_win_crt_string_l1_1_0.dll_strncmp]
add esp, 0xc
test eax, eax
jne 0x51a4b6
mov al, byte [edi + 5]
sub al, 0x30
cmp al, 9
ja 0x51a4bd
cmp byte [edi + 6], 0x2e
jne 0x51a4bd
mov al, byte [edi + 7]
sub al, 0x30
cmp al, 9
ja 0x51a4bd
mov al, byte [edi + 8]
cmp al, 0x20
je 0x51a27f
cmp al, 9
jne 0x51a4bd
mov cl, byte [edi + 9]
lea eax, [ecx - 0x30]
cmp al, 9
ja 0x51a4bd
mov dl, byte [edi + 0xa]
lea eax, [edx - 0x30]
cmp al, 9
ja 0x51a4bd
mov dh, byte [edi + 0xb]
mov al, dh
sub al, 0x30
cmp al, 9
ja 0x51a4bd
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 [esi + 0xd4], eax
mov al, byte [edi + 0xc]
cmp al, 0x20
je 0x51a2df
cmp al, 9
je 0x51a2df
sub al, 0xa
cmp al, 3
ja 0x51a4bd
mov dword [esi + 0xd0], 0xb
mov ecx, dword [esi + 0xd0]
mov eax, ecx
mov edi, dword [esi + 0x18]
sub eax, 0xa
je 0x51a319
sub eax, 1
je 0x51a319
mov eax, ecx
mov ecx, 0xa
cdq
idiv ecx
mov ecx, str.Unsupported_HTTP_version___u._d__in_response
mov dword [esp + 0x14], edx
mov edx, eax
mov eax, dword [esp + 0x14]
jmp 0x51a358
mov al, byte [edi + 0x4d4]
test al, al
je 0x51a36e
movzx ecx, al
mov eax, 0xcccccccd
mul ecx
mov eax, 0x66666667
mov ecx, edx
imul dword [esi + 0xd0]
shr ecx, 3
sar edx, 2
mov eax, edx
mov dword [esp + 0x14], ecx
shr eax, 0x1f
add eax, edx
cmp eax, ecx
je 0x51a36e
mov edx, dword [esp + 0x14]
mov ecx, str.Version_mismatch__from_HTTP__u_to_HTTP__u_
push eax
push edx
push ecx
push esi
call fcn.004f54f0
add esp, 0x10
mov eax, 1
pop edi
pop esi
pop ebp
pop ebx
ret
mov eax, dword [esi + 0xd4]
mov dword [esi + 0xd08], eax
mov eax, dword [esi + 0xd0]
mov dword [esi + 0xd10], eax
movzx eax, byte [esi + 0xd0]
mov byte [edi + 0x4d4], al
mov al, byte [esi + 0xce5]
test al, al
je 0x51a3ac
mov ecx, dword [esi + 0xd0]
movzx eax, al
cmp eax, ecx
jle 0x51a3be
jmp 0x51a3b2
mov cl, byte [esi + 0xd0]
mov byte [esi + 0xce5], cl
mov ecx, dword [esi + 0xd0]
mov eax, dword [esi + 0xbc8]
or eax, dword [esi + 0xbcc]
je 0x51a3e8
cmp byte [esi + 0xce6], 0
jne 0x51a3e8
cmp dword [esi + 0xd4], 0x1a0
jne 0x51a3e8
mov byte [esi + 0x136], 1
cmp ecx, 0xa
jne 0x51a405
push str.HTTP_1.0__assume_close_after_body
push esi
call fcn.004f55c0
push 1
push edi
call fcn.005065f0
add esp, 0x10
jmp 0x51a428
cmp ecx, 0x14
je 0x51a41c
cmp dword [esi + 0xdc], 2
jne 0x51a428
cmp dword [esi + 0xd4], 0x65
jne 0x51a428
mov eax, dword [edi + 0x4a8]
mov dword [eax], 2
mov ecx, dword [esi + 0xd4]
lea eax, [ecx - 0x64]
cmp eax, 0x63
setbe al
mov byte [esi + 0x137], al
sub ecx, 0xcc
je 0x51a459
sub ecx, 0x64
jne 0x51a488
cmp byte [esi + 0x3b0], cl
je 0x51a459
mov byte [esi + 0xdc8], 1
mov dword [esi + 0x88], 0
mov dword [esi + 0x8c], 0
mov dword [esi + 0x90], 0
mov dword [esi + 0x94], 0
mov byte [esi + 0x137], 1
mov edi, 0xc
push ebp
push 0
push ebx
call sub.VCRUNTIME140.dll_memchr
add esp, 0xc
test eax, eax
je 0x51a4c7
mov eax, str.Nul_byte_in_header
push eax
push esi
call fcn.004f54f0
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
ret
mov byte [esi + 0x12d], 0
pop edi
pop esi
pop ebp
mov eax, 8
pop ebx
ret
mov ecx, dword [esi + 0xc4]
cmp ecx, 2
jl 0x51a50a
mov al, byte [ebx]
cmp al, 0x20
je 0x51a4dc
cmp al, 9
jne 0x51a4e1
cmp ecx, 2
jg 0x51a50a
push ebp
push 0x3a
push ebx
call sub.VCRUNTIME140.dll_memchr
add esp, 0xc
test eax, eax
jne 0x51a50a
mov eax, str.Header_without_colon
push eax
push esi
call fcn.004f54f0
add esp, 8
mov eax, 8
pop edi
pop esi
pop ebp
pop ebx
ret
push ebp
push ebx
push esi
call fcn.00517be0
add esp, 0xc
test eax, eax
jne 0x51a63c
push ebp
push ebx
push 1
push esi
call fcn.004f5440
mov eax, dword [esi + 0xd4]
add esp, 0x10
sub eax, 0x64
cmp eax, 0x64
jae 0x51a53b
or edi, 0x20
push ebp
push ebx
push edi
push esi
call fcn.004f2ce0
add esp, 0x10
test eax, eax
jne 0x51a63c
push eax
push ebp
push esi
call fcn.00517220
add esp, 0xc
pop edi
pop esi
pop ebp
pop ebx
ret
push ebp
push ebx
push 1
push esi
call fcn.004f5440
mov eax, dword [esi + 0xd4]
sub eax, 0x64
cmp eax, 0x64
push ebp
sbb eax, eax
and eax, 0x20
add eax, 4
push ebx
push eax
push esi
call fcn.004f2ce0
add esp, 0x20
test eax, eax
jne 0x51a63c
mov ecx, dword [esi + 0xbc]
mov edx, 0x4b000
add ecx, ebp
cmp ebp, edx
jae 0x51a5d0
mov eax, dword [esi + 0xd48]
add dword [esi + 0xb8], ebp
add eax, ebp
mov dword [esi + 0xd48], eax
mov dword [esi + 0xbc], ecx
cmp ecx, edx
ja 0x51a5d6
cmp eax, 0x5dc000
jbe 0x51a5f0
mov ecx, eax
mov edx, 0x5dc000
jmp 0x51a5d6
mov eax, ecx
test eax, eax
je 0x51a5f0
push edx
push ecx
push str.Too_large_response_headers:__zu____u
push esi
call fcn.004f54f0
add esp, 0x10
mov eax, 0x38
pop edi
pop esi
pop ebp
pop ebx
ret
mov eax, dword [esi + 0xd4]
sub eax, 0x64
cmp eax, 0x63
ja 0x51a606
mov eax, dword [esi + 0xb8]
jmp 0x51a608
xor eax, eax
mov dword [esi + 0xc0], eax
lea eax, [esi + 0x870]
push eax
call fcn.004f5280
lea eax, [esp + 0x18]
push eax
push dword [esp + 0x2c]
push dword [esp + 0x2c]
push esi
call fcn.005195a0
add esp, 0x14
test eax, eax
jne 0x51a63c
mov eax, dword [esp + 0x14]
add dword [edi], eax
xor eax, eax
pop edi
pop esi
pop ebp
pop ebx
ret