Function at 0x140018260
Capabilities:
Encode data using xor
Manually build aes constants

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, 0x810
mov rax, qword [0x140059010]
xor rax, rsp
mov qword [rsp + 0x800], rax
mov r10d, 1
lea r11, [rsp + 0x400]
mov r8d, r10d
xor r9d, r9d
mov ebx, 0x100
nop dword [rax]
mov eax, r8d
movzx ecx, r8b
mov dword [r11], r8d
lea r11, [r11 + 4]
and r8b, 0x80
mov dword [rsp + rax*4], r9d
movzx eax, cl
add al, al
movzx edx, al
xor edx, ecx
neg r8b
mov r8d, edx
sbb eax, eax
inc r9d
and eax, 0x1b
xor r8d, eax
cmp r9d, ebx
jl 0x1400182b0
mov edx, r10d
lea r8, [0x14005d500]
mov r9d, 0xa
nop word [rax + rax]
mov eax, edx
mov dword [r8], edx
and al, 0x80
lea r8, [r8 + 4]
neg al
sbb ecx, ecx
add dl, dl
and ecx, 0x1b
movzx eax, dl
mov edx, ecx
xor edx, eax
sub r9, r10
jne 0x140018300
mov byte [0x14005d463], r9b
lea r11, [rsp + 4]
lea r9, [0x14005cf01]
mov byte [0x14005cf00], 0x63
lea r12, [0x140000000]
nop dword [rax]
nop word [rax + rax]
mov eax, 0xff
lea r9, [r9 + 1]
sub eax, dword [r11]
lea r11, [r11 + 4]
cdqe
mov r8d, dword [rsp + rax*4 + 0x400]
mov ecx, r8d
sar ecx, 7
lea eax, [r8 + r8]
or ecx, eax
movzx edx, cl
movzx eax, dl
xor r8d, edx
add al, al
shr edx, 7
movzx ecx, al
or ecx, edx
movzx eax, cl
xor r8d, ecx
add al, al
shr ecx, 7
movzx edx, al
or edx, ecx
movzx eax, dl
add al, al
movzx ecx, al
mov eax, edx
shr eax, 7
or ecx, eax
xor ecx, 0x63
xor ecx, edx
xor r8d, ecx
movsxd rax, r8d
mov byte [r9 - 1], r8b
mov byte [rax + r12 + 0x5d400], r10b
inc r10d
cmp r10d, ebx
jl 0x140018350
mov rsi, qword [rsp + 0x38]
xor r9d, r9d
mov rbp, qword [rsp + 0x34]
mov r14, qword [rsp + 0x2c]
mov r15, qword [rsp + 0x24]
nop
movzx r8d, byte [r9 + r12 + 0x5cf00]
mov eax, r8d
and al, 0x80
neg al
movzx eax, r8b
sbb edx, edx
add al, al
movzx ecx, al
and edx, 0x1b
xor edx, ecx
mov eax, edx
xor eax, r8d
shl eax, 8
xor eax, r8d
shl eax, 8
xor eax, r8d
shl eax, 8
xor eax, edx
mov dword [r12 + r9*4 + 0x5e930], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5e530], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5d930], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5d530], eax
movzx eax, byte [r9 + r12 + 0x5d400]
test al, al
je 0x1400184fc
mov r8d, dword [rsp + rax*4]
mov eax, 0x80808081
lea ecx, [r8 + rsi]
imul ecx
add edx, ecx
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub ecx, eax
movsxd rax, ecx
lea ecx, [r8 + r15]
mov r10d, dword [rsp + rax*4 + 0x400]
mov eax, 0x80808081
imul ecx
add edx, ecx
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub ecx, eax
movsxd rax, ecx
lea ecx, [r8 + rbp]
mov r11d, dword [rsp + rax*4 + 0x400]
mov eax, 0x80808081
imul ecx
add edx, ecx
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub ecx, eax
movsxd rax, ecx
lea ecx, [r8 + r14]
mov edi, dword [rsp + rax*4 + 0x400]
mov eax, 0x80808081
imul ecx
add edx, ecx
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub ecx, eax
movsxd rax, ecx
mov eax, dword [rsp + rax*4 + 0x400]
jmp 0x140018506
xor r10d, r10d
xor r11d, r11d
xor edi, edi
xor eax, eax
shl eax, 8
xor eax, edi
shl eax, 8
xor eax, r11d
shl eax, 8
xor eax, r10d
mov dword [r12 + r9*4 + 0x5e130], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5dd30], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5ed30], eax
rol eax, 8
mov dword [r12 + r9*4 + 0x5d000], eax
inc r9
sub rbx, 1
jne 0x1400183e0
mov rcx, qword [rsp + 0x800]
xor rcx, rsp
call fcn.14001a680
lea r11, [rsp + 0x810]
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