Function at 0x1800d8cb0
Capabilities:
Validate payment card number using luhn algorithm

Disassembly:
mov qword [rsp + 8], rbx
mov qword [rsp + 0x10], rbp
mov qword [rsp + 0x18], rsi
mov qword [rsp + 0x20], rdi
push r12
push r14
push r15
sub rsp, 0x50
mov r14, qword [rsp + 0x98]
xor r12d, r12d
mov r15, r9
mov rbp, r8
mov rsi, rdx
mov rdi, rcx
mov qword [r14], r12
movzx eax, byte [rdx]
cmp al, 0xa
je 0x1800d9224
cmp al, 0xd
je 0x1800d9224
lea r14, [rcx + 0x13c]
mov ebx, 4
mov ecx, dword [r14]
mov r15d, 1
lea eax, [rcx + 1]
mov dword [r14], eax
test ecx, ecx
jne 0x1800d913f
mov dword [rdi + 0x148], r12d
mov rax, qword [rdi + 0x18]
mov rcx, qword [rax + 0x3e0]
mov eax, dword [rcx + 0x8c]
test al, 3
je 0x1800d8edd
movzx eax, byte [rdx]
mov rbx, rdx
test al, al
je 0x1800d8d5c
cmp al, 0x20
je 0x1800d8d51
cmp byte [rbx], 9
jne 0x1800d8d5c
movzx eax, byte [rbx + 1]
inc rbx
test al, al
jne 0x1800d8d48
mov r8d, 5
lea rdx, str.HTTP_
mov rcx, rbx
call sub.api_ms_win_crt_string_l1_1_0.dll_strncmp
test eax, eax
jne 0x1800d8e15
movsx edx, byte [rbx + 5]
mov ecx, edx
sub ecx, 0x31
je 0x1800d8e45
sub ecx, r15d
je 0x1800d8da9
cmp ecx, r15d
je 0x1800d8da9
lea rdx, str.Unsupported_HTTP_version_in_response
mov rcx, rdi
call fcn.1800c4a60
mov eax, r15d
jmp 0x1800d92ad
movzx eax, byte [rbx + 6]
cmp al, 0x20
je 0x1800d8db5
cmp al, 9
jne 0x1800d8e15
lea eax, [rdx - 0x30]
lea ecx, [rax + rax*4]
add ecx, ecx
mov dword [rdi + 0x148], ecx
movsx ecx, byte [rbx + 7]
lea eax, [rcx - 0x30]
cmp al, 9
ja 0x1800d8e15
movsx edx, byte [rbx + 8]
lea eax, [rdx - 0x30]
cmp al, 9
ja 0x1800d8e15
movsx r8d, byte [rbx + 9]
lea eax, [r8 - 0x30]
cmp al, 9
ja 0x1800d8e15
lea ecx, [rcx + rcx*4]
lea ecx, [rdx + rcx*2]
lea ecx, [rcx + rcx*4]
lea ecx, [rcx - 0xa68]
lea ecx, [r8 + rcx*2]
mov dword [rdi + 0x14c], ecx
movzx eax, byte [rbx + 0xa]
cmp al, 0x20
je 0x1800d8fc0
sub al, 9
cmp al, 4
jbe 0x1800d8fc0
mov r8, rbp
mov rdx, rsi
mov rcx, rdi
call fcn.1800d7e70
cmp eax, r15d
jne 0x1800d916a
mov dword [rdi + 0x14c], 0xc8
mov dword [rdi + 0x148], 0xa
jmp 0x1800d8fc0
cmp byte [rbx + 6], 0x2e
jne 0x1800d8ec6
movsx ecx, byte [rbx + 7]
lea eax, [rcx - 0x30]
cmp al, r15b
ja 0x1800d8ec6
movzx eax, byte [rbx + 8]
cmp al, 0x20
je 0x1800d8e63
cmp al, 9
jne 0x1800d8ec6
lea eax, [rcx - 0x26]
mov dword [rdi + 0x148], eax
movsx ecx, byte [rbx + 9]
lea eax, [rcx - 0x30]
cmp al, 9
ja 0x1800d8ec6
movsx edx, byte [rbx + 0xa]
lea eax, [rdx - 0x30]
cmp al, 9
ja 0x1800d8ec6
movsx r8d, byte [rbx + 0xb]
lea eax, [r8 - 0x30]
cmp al, 9
ja 0x1800d8ec6
lea ecx, [rcx + rcx*4]
lea ecx, [rdx + rcx*2]
lea ecx, [rcx + rcx*4]
lea ecx, [rcx - 0xa68]
lea ecx, [r8 + rcx*2]
mov dword [rdi + 0x14c], ecx
movzx eax, byte [rbx + 0xc]
cmp al, 0x20
je 0x1800d8fc0
cmp al, 9
je 0x1800d8fc0
sub al, 0xa
cmp al, 3
jbe 0x1800d8fc0
lea rdx, str.Unsupported_HTTP_1_subversion_in_response
mov rcx, rdi
call fcn.1800c4a60
mov eax, r15d
jmp 0x1800d92ad
bt eax, 0x12
jae 0x1800d916a
movzx eax, byte [rdx]
mov rbx, rsi
test al, al
je 0x1800d8f05
cmp al, 0x20
je 0x1800d8efa
cmp byte [rbx], 9
jne 0x1800d8f05
movzx eax, byte [rbx + 1]
inc rbx
test al, al
jne 0x1800d8ef1
mov r8d, 5
lea rdx, str.RTSP_
mov rcx, rbx
call sub.api_ms_win_crt_string_l1_1_0.dll_strncmp
test eax, eax
jne 0x1800d916a
movzx eax, byte [rbx + 5]
sub al, 0x30
cmp al, 9
ja 0x1800d9171
cmp byte [rbx + 6], 0x2e
jne 0x1800d9171
movzx eax, byte [rbx + 7]
sub al, 0x30
cmp al, 9
ja 0x1800d9171
movzx eax, byte [rbx + 8]
cmp al, 0x20
je 0x1800d8f58
cmp al, 9
jne 0x1800d9171
movsx ecx, byte [rbx + 9]
lea eax, [rcx - 0x30]
cmp al, 9
ja 0x1800d9171
movsx edx, byte [rbx + 0xa]
lea eax, [rdx - 0x30]
cmp al, 9
ja 0x1800d9171
movsx r8d, byte [rbx + 0xb]
lea eax, [r8 - 0x30]
cmp al, 9
ja 0x1800d9171
lea ecx, [rcx + rcx*4]
lea ecx, [rdx + rcx*2]
lea ecx, [rcx + rcx*4]
lea ecx, [rcx - 0xa68]
lea ecx, [r8 + rcx*2]
mov dword [rdi + 0x14c], ecx
movzx eax, byte [rbx + 0xc]
cmp al, 0x20
je 0x1800d8fb6
cmp al, 9
je 0x1800d8fb6
sub al, 0xa
cmp al, 3
ja 0x1800d9171
mov dword [rdi + 0x148], recvfrom
mov r9d, dword [rdi + 0x148]
mov ecx, r9d
mov rbx, qword [rdi + 0x18]
sub ecx, 0xa
je 0x1800d9010
cmp ecx, r15d
je 0x1800d9010
mov eax, 0x66666667
mov rcx, rdi
imul r9d
mov r8d, edx
lea rdx, str.Unsupported_HTTP_version___u._d__in_response
sar r8d, 2
mov eax, r8d
shr eax, 0x1f
add r8d, eax
lea eax, [r8 + r8*4]
add eax, eax
sub r9d, eax
call fcn.1800c4a60
mov eax, r15d
jmp 0x1800d92ad
movzx eax, byte [rbx + 0x7e0]
test al, al
je 0x1800d905f
mov ecx, eax
mov eax, 0xcccccccd
mul ecx
mov eax, 0x66666667
mov r8d, edx
imul r9d
shr r8d, 3
mov r9d, edx
sar r9d, 2
mov eax, r9d
shr eax, 0x1f
add r9d, eax
cmp r9d, r8d
je 0x1800d905f
lea rdx, str.Version_mismatch__from_HTTP__u_to_HTTP__u_
mov rcx, rdi
call fcn.1800c4a60
mov eax, r15d
jmp 0x1800d92ad
mov eax, dword [rdi + 0x14c]
mov dword [rdi + 0x1338], eax
mov eax, dword [rdi + 0x148]
mov dword [rdi + 0x1340], eax
movzx eax, byte [rdi + 0x148]
mov byte [rbx + 0x7e0], al
movzx eax, byte [rdi + 0x1319]
test al, al
je 0x1800d9097
cmp eax, dword [rdi + 0x148]
jle 0x1800d90a4
movzx eax, byte [rdi + 0x148]
mov byte [rdi + 0x1319], al
cmp qword [rdi + 0x1120], r12
je 0x1800d90c9
cmp byte [rdi + 0x131a], r12b
jne 0x1800d90c9
cmp dword [rdi + 0x14c], 0x1a0
jne 0x1800d90c9
mov byte [rdi + 0x1e3], r15b
cmp dword [rdi + 0x148], 0xa
jne 0x1800d90ec
lea rdx, str.HTTP_1.0__assume_close_after_body
mov rcx, rdi
call fcn.1800c4b50
mov edx, r15d
mov rcx, rbx
call fcn.1800c7940
mov ecx, dword [rdi + 0x14c]
lea eax, [rcx - 0x64]
cmp eax, 0x63
setbe al
mov byte [rdi + 0x1e4], al
sub ecx, 0xcc
je 0x1800d911e
cmp ecx, 0x64
jne 0x1800d9133
cmp byte [rdi + 0x538], r12b
je 0x1800d911e
mov byte [rdi + 0x1414], r15b
mov qword [rdi + 0x100], r12
mov qword [rdi + 0x108], r12
mov byte [rdi + 0x1e4], r15b
mov ebx, ntohs
lea r14, [rdi + 0x13c]
mov r8, rbp
xor edx, edx
mov rcx, rsi
call sub.VCRUNTIME140.dll_memchr
test rax, rax
je 0x1800d917b
lea rdx, str.Nul_byte_in_header
mov rcx, rdi
mov ebx, 8
call fcn.1800c4a60
jmp 0x1800d92ab
mov byte [rdi + 0x1d9], r12b
mov eax, 8
jmp 0x1800d92ad
mov ecx, dword [r14]
cmp ecx, 2
jl 0x1800d91c1
movzx eax, byte [rsi]
cmp al, 0x20
je 0x1800d918e
cmp al, 9
jne 0x1800d9193
cmp ecx, 2
jg 0x1800d91c1
mov r8, rbp
mov edx, 0x3a
mov rcx, rsi
call sub.VCRUNTIME140.dll_memchr
test rax, rax
jne 0x1800d91c1
lea rdx, str.Header_without_colon
mov rcx, rdi
mov ebx, 8
call fcn.1800c4a60
jmp 0x1800d92ab
mov r8, rbp
mov rdx, rsi
mov rcx, rdi
call fcn.1800d6280
test eax, eax
jne 0x1800d92ad
mov r9, rbp
mov r8, rsi
mov edx, r15d
mov rcx, rdi
call fcn.1800c4970
mov eax, dword [rdi + 0x14c]
sub eax, 0x64
cmp eax, 0x64
jae 0x1800d91f9
or ebx, 0x20
mov r9, rbp
mov r8, rsi
mov edx, ebx
mov rcx, rdi
call fcn.1800c5f70
test eax, eax
jne 0x1800d92ad
xor r8d, r8d
mov rdx, rbp
mov rcx, rdi
call fcn.1800d5780
jmp 0x1800d92ad
lea rdx, [r8 + 1]
lea rcx, [rsp + 0x30]
call fcn.1800b5960
mov r8, rbp
lea rcx, [rsp + 0x30]
mov rdx, rsi
call fcn.1800b5920
test eax, eax
jne 0x1800d92ad
lea rcx, [rdi + 0xc58]
call fcn.1800b59a0
lea rcx, [rsp + 0x30]
call fcn.1800b5980
lea rcx, [rsp + 0x30]
mov rbx, rax
call fcn.1800b5990
mov rcx, qword [rsp + 0x90]
mov rdx, rax
lea rax, [rsp + 0x98]
mov r9, r15
mov qword [rsp + 0x28], rax
mov r8, rbx
mov qword [rsp + 0x20], rcx
mov rcx, rdi
call fcn.1800d7fb0
mov rcx, qword [rsp + 0x98]
mov ebx, eax
add qword [r14], rcx
lea rcx, [rsp + 0x30]
call fcn.1800b5930
mov eax, ebx
lea r11, [rsp + 0x50]
mov rbx, qword [r11 + 0x20]
mov rbp, qword [r11 + 0x28]
mov rsi, qword [r11 + 0x30]
mov rdi, qword [r11 + 0x38]
mov rsp, r11
pop r15
pop r14
pop r12
ret