Function at 0x1400c7440
Capabilities:
Validate payment card number using luhn algorithm

Disassembly:
mov qword [rsp + 0x18], r8
mov qword [rsp + 8], rcx
push rbx
push rbp
push rsi
push rdi
push r14
push r15
sub rsp, 0x78
mov rbx, rdx
movaps xmmword [rsp + 0x50], xmm6
mov rdx, rcx
movaps xmmword [rsp + 0x40], xmm7
movaps xmmword [rsp + 0x30], xmm8
xorps xmm6, xmm6
xorps xmm8, xmm8
mov rax, qword [rbx + 0x28]
mov rcx, qword [rbx + 0x38]
sub rcx, qword [rbx + 0x10]
add rcx, rax
cmp byte [rax], 0x2d
mov qword [rsp + 0x20], rcx
jne 0x1400c74a1
mov rcx, rbx
call fcn.1400c57d0
mov rdx, qword [rsp + 0xb0]
mov r15b, 1
jmp 0x1400c74a4
xor r15b, r15b
mov rcx, qword [rbx + 0x28]
xor r14d, r14d
movsd xmm7, qword [0x1404dd218]
mov esi, r14d
mov qword [rsp + 0x70], r12
mov ebp, r14d
mov byte [rsp + 0xc8], r15b
movsx edi, byte [rcx]
mov qword [rsp + 0x68], r13
mov byte [rsp + 0xb8], sil
cmp dil, 0x30
jne 0x1400c74ef
mov rcx, rbx
mov r12d, r14d
call fcn.1400c57d0
xor r13b, r13b
jmp 0x1400c76e2
lea eax, [rdi - 0x31]
cmp al, 8
ja 0x1400c7a8b
mov rcx, rbx
call fcn.1400c57d0
mov rcx, qword [rbx + 0x28]
lea r12d, [rdi - 0x30]
movzx edi, byte [rcx]
test r15b, r15b
je 0x1400c7565
cmp dil, 0x30
jl 0x1400c75bc
nop dword [rax]
cmp dil, 0x39
ja 0x1400c75bc
cmp r12d, 0xccccccc
jb 0x1400c753b
jne 0x1400c75b1
cmp dil, 0x38
ja 0x1400c75b1
mov rcx, rbx
call fcn.1400c57d0
lea ecx, [r12 - 6]
movzx eax, dil
lea ecx, [r12 + rcx*4]
inc ebp
lea r12d, [rax + rcx*2]
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
cmp dil, 0x30
jge 0x1400c7520
jmp 0x1400c75bc
cmp dil, 0x30
jl 0x1400c75bc
nop dword [rax + rax]
cmp dil, 0x39
ja 0x1400c75bc
cmp r12d, 0x19999999
jb 0x1400c7587
jne 0x1400c75b1
cmp dil, 0x35
ja 0x1400c75b1
mov rcx, rbx
call fcn.1400c57d0
lea ecx, [r12 - 6]
movzx eax, dil
lea ecx, [r12 + rcx*4]
inc ebp
lea r12d, [rax + rcx*2]
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
cmp dil, 0x30
jge 0x1400c7570
jmp 0x1400c75bc
mov byte [rsp + 0xb8], 1
mov esi, r12d
xor r13b, r13b
cmp byte [rsp + 0xb8], r13b
je 0x1400c76e2
cmp byte [rcx], 0x30
jl 0x1400c76e2
movzx edi, byte [rcx]
test r15b, r15b
je 0x1400c7647
movabs r15, 0xccccccccccccccc
nop dword [rax + rax]
cmp dil, 0x39
ja 0x1400c76e2
cmp rsi, r15
jb 0x1400c7607
jne 0x1400c7632
cmp dil, 0x38
ja 0x1400c7632
mov rcx, rbx
call fcn.1400c57d0
movzx ecx, dil
lea rax, [rsi + rsi*4]
sub ecx, 0x30
inc ebp
lea rsi, [rcx + rax*2]
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
cmp dil, 0x30
jge 0x1400c75f0
jmp 0x1400c76e2
mov rdx, rsi
mov r13b, 1
xorps xmm6, xmm6
test rdx, rdx
js 0x1400c7693
cvtsi2sd xmm6, rdx
jmp 0x1400c76a8
movabs r15, 0x1999999999999999
mov rdx, rsi
cmp dil, 0x39
ja 0x1400c76e2
cmp rsi, r15
jb 0x1400c766b
jne 0x1400c7635
cmp dil, 0x35
ja 0x1400c7635
mov rcx, rbx
call fcn.1400c57d0
movzx ecx, dil
lea rax, [rsi + rsi*4]
sub ecx, 0x30
inc ebp
lea rsi, [rcx + rax*2]
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
cmp dil, 0x30
jge 0x1400c7651
jmp 0x1400c76e2
mov rax, rdx
and edx, 1
shr rax, 1
or rax, rdx
cvtsi2sd xmm6, rax
addsd xmm6, xmm6
cmp byte [rcx], 0x30
jl 0x1400c76e2
movzx edi, byte [rcx]
cmp dil, 0x39
ja 0x1400c76e2
mov rcx, rbx
call fcn.1400c57d0
movzx eax, dil
sub eax, 0x30
mulsd xmm6, xmm7
movd xmm0, eax
mov rax, qword [rbx + 0x28]
cvtdq2pd xmm0, xmm0
movzx edi, byte [rax]
addsd xmm6, xmm0
cmp dil, 0x30
jge 0x1400c76b0
mov rdx, qword [rbx + 0x28]
mov r15d, r14d
cmp byte [rdx], 0x2e
jne 0x1400c77ac
mov rcx, rbx
call fcn.1400c57d0
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
lea eax, [rdi - 0x30]
cmp al, 9
ja 0x1400c783c
test r13b, r13b
jne 0x1400c77ee
cmp byte [rsp + 0xb8], r14b
jne 0x1400c7722
mov esi, r12d
mov rax, rcx
movabs r13, 0x1fffffffffffff
nop
mov r8, rcx
mov rdx, rax
cmp dil, 0x39
ja 0x1400c7778
cmp rsi, r13
ja 0x1400c7778
mov rcx, rbx
call fcn.1400c57d0
movzx ecx, dil
lea rax, [rsi + rsi*4]
sub ecx, 0x30
dec r15d
lea rsi, [rcx + rax*2]
test rsi, rsi
je 0x1400c7762
inc ebp
mov rcx, qword [rbx + 0x28]
mov rax, rcx
mov r8, rcx
mov rdx, rcx
movzx edi, byte [rcx]
cmp dil, 0x30
jge 0x1400c7730
xorps xmm6, xmm6
test rsi, rsi
js 0x1400c7787
cvtsi2sd xmm6, rsi
jmp 0x1400c779f
mov rax, rsi
mov rcx, rsi
shr rcx, 1
and eax, 1
or rcx, rax
cvtsi2sd xmm6, rcx
addsd xmm6, xmm6
movzx edi, byte [r8]
mov r13b, 1
cmp dil, 0x30
jge 0x1400c77f1
movzx eax, byte [rdx]
cmp al, 0x65
je 0x1400c77bb
cmp al, 0x45
jne 0x1400c794c
mov rcx, rbx
call fcn.1400c57d0
test r13b, r13b
jne 0x1400c7877
mov rcx, rsi
cmp byte [rsp + 0xb8], r14b
jne 0x1400c77dc
mov ecx, r12d
xorps xmm6, xmm6
test rcx, rcx
js 0x1400c785f
cvtsi2sd xmm6, rcx
jmp 0x1400c7874
mov rdx, rcx
cmp dil, 0x39
ja 0x1400c77ac
mov rcx, rbx
call fcn.1400c57d0
cmp ebp, 0x11
jge 0x1400c782a
mulsd xmm6, xmm7
dec r15d
movzx eax, dil
sub eax, 0x30
movd xmm0, eax
cvtdq2pd xmm0, xmm0
addsd xmm0, xmm6
comisd xmm0, xmm8
movaps xmm6, xmm0
jbe 0x1400c782a
inc ebp
mov rdx, qword [rbx + 0x28]
movzx edi, byte [rdx]
cmp dil, 0x30
jge 0x1400c77f1
jmp 0x1400c77ac
mov rax, qword [rbx + 0x38]
sub rax, qword [rbx + 0x10]
add rax, rcx
mov rcx, qword [rsp + 0xb0]
mov dword [rcx + 0x30], recv
mov qword [rcx + 0x38], rax
jmp 0x1400c7aa1
mov rax, rcx
and ecx, 1
shr rax, 1
or rax, rcx
cvtsi2sd xmm6, rax
addsd xmm6, xmm6
mov r13b, 1
mov rcx, qword [rbx + 0x28]
xor bpl, bpl
movzx edi, byte [rcx]
cmp dil, 0x2b
jne 0x1400c7891
mov rcx, rbx
call fcn.1400c57d0
jmp 0x1400c78a2
cmp dil, 0x2d
jne 0x1400c78a9
mov rcx, rbx
call fcn.1400c57d0
mov bpl, 1
mov rcx, qword [rbx + 0x28]
movzx edi, byte [rcx]
lea eax, [rdi - 0x30]
cmp al, 9
ja 0x1400c79d5
mov rcx, rbx
call fcn.1400c57d0
mov rax, qword [rbx + 0x28]
movsx r14d, dil
sub r14d, 0x30
movzx edi, byte [rax]
test bpl, bpl
je 0x1400c798c
lea ecx, [r15 + 0x7ffffff7]
mov eax, 0x66666667
imul ecx
mov ebp, edx
sar ebp, 2
mov eax, ebp
shr eax, 0x1f
add ebp, eax
cmp dil, 0x30
jl 0x1400c7949
cmp dil, 0x39
ja 0x1400c7949
mov rcx, rbx
call fcn.1400c57d0
lea r14d, [r14 + r14*4]
movzx eax, dil
lea r14d, [r14 - 0x18]
lea r14d, [rax + r14*2]
cmp r14d, ebp
jle 0x1400c793c
mov rax, qword [rbx + 0x28]
movzx ecx, byte [rax]
cmp cl, 0x30
jl 0x1400c793c
cmp cl, 0x39
ja 0x1400c793c
mov rcx, rbx
call fcn.1400c57d0
mov rax, qword [rbx + 0x28]
movzx ecx, byte [rax]
cmp cl, 0x30
jge 0x1400c7923
mov rax, qword [rbx + 0x28]
movzx edi, byte [rax]
cmp dil, 0x30
jge 0x1400c78f4
neg r14d
test r13b, r13b
je 0x1400c7a1b
lea edx, [r14 + r15]
movaps xmm0, xmm6
call fcn.1400218e0
comisd xmm0, xmmword [0x1404dd298]
jbe 0x1400c79f8
mov rcx, qword [rsp + 0xb0]
mov rax, qword [rsp + 0x20]
mov dword [rcx + 0x30], reloc.WS2_32.dll_listen
mov qword [rcx + 0x38], rax
jmp 0x1400c7aa1
mov ebp, 0x134
sub ebp, r15d
cmp dil, 0x30
jl 0x1400c794c
nop word [rax + rax]
cmp dil, 0x39
ja 0x1400c794c
mov rcx, rbx
call fcn.1400c57d0
lea r14d, [r14 + r14*4]
movzx eax, dil
lea r14d, [r14 - 0x18]
lea r14d, [rax + r14*2]
cmp r14d, ebp
jg 0x1400c796f
mov rax, qword [rbx + 0x28]
movzx edi, byte [rax]
cmp dil, 0x30
jge 0x1400c79a0
jmp 0x1400c794c
mov rax, qword [rbx + 0x38]
sub rax, qword [rbx + 0x10]
add rax, rcx
mov rcx, qword [rsp + 0xb0]
mov dword [rcx + 0x30], reloc.WS2_32.dll_ntohs
mov qword [rcx + 0x38], rax
jmp 0x1400c7aa1
cmp byte [rsp + 0xc8], 0
je 0x1400c7a09
xorps xmm0, xmmword [0x1404dd780]
mov rcx, qword [rsp + 0xc0]
movaps xmm1, xmm0
call fcn.140025390
jmp 0x1400c7a6d
cmp byte [rsp + 0xb8], 0
mov rcx, qword [rsp + 0xc0]
je 0x1400c7a4e
cmp byte [rsp + 0xc8], 0
je 0x1400c7a44
neg rsi
mov rdx, rsi
call fcn.140025480
jmp 0x1400c7a6d
mov rdx, rsi
call fcn.1400253f0
jmp 0x1400c7a6d
cmp byte [rsp + 0xc8], 0
je 0x1400c7a65
neg r12d
mov edx, r12d
call fcn.140025590
jmp 0x1400c7a6d
mov edx, r12d
call fcn.140025530
test al, al
jne 0x1400c7aa1
mov rcx, qword [rsp + 0xb0]
mov rax, qword [rsp + 0x20]
mov dword [rcx + 0x30], reloc.WS2_32.dll_recv
mov qword [rcx + 0x38], rax
jmp 0x1400c7aa1
mov rax, qword [rbx + 0x38]
sub rax, qword [rbx + 0x10]
add rax, rcx
mov dword [rdx + 0x30], 3
mov qword [rdx + 0x38], rax
mov r13, qword [rsp + 0x68]
mov r12, qword [rsp + 0x70]
movaps xmm6, xmmword [rsp + 0x50]
movaps xmm7, xmmword [rsp + 0x40]
movaps xmm8, xmmword [rsp + 0x30]
add rsp, 0x78
pop r15
pop r14
pop rdi
pop rsi
pop rbp
pop rbx
ret