Function at 0x140278f10
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 [0x140468080]
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 0x140278f60
mov dword [0x14065b470], r10d
lea r9, [0x140659271]
mov dword [0x14065b474], 2
lea r11, [rsp + 4]
mov dword [0x14065b478], 4
lea r12, [0x140000000]
mov dword [0x14065b47c], 8
mov dword [0x14065b480], 0x10
mov dword [0x14065b484], 0x20
mov dword [0x14065b488], 0x40
mov dword [0x14065b48c], 0x80
mov dword [0x14065b490], 0x1b
mov dword [0x14065b494], 0x36
mov byte [0x140659270], 0x63
mov byte [0x14065a3d3], 0
nop dword [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 + 0x65a370], r10b
inc r10d
cmp r10d, ebx
jl 0x140279020
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 + 0x659270]
movzx edi, byte [r9 + r12 + 0x65a370]
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 ecx, eax
mov dword [r12 + r9*4 + 0x659370], eax
shl eax, 8
shr ecx, 0x18
or ecx, eax
mov eax, ecx
mov dword [r12 + r9*4 + 0x659770], ecx
shr eax, 0x18
shl ecx, 8
or eax, ecx
mov dword [r12 + r9*4 + 0x659b70], eax
ror eax, 0x18
mov dword [r12 + r9*4 + 0x659f70], eax
test dil, dil
je 0x1402791eb
mov ecx, dword [rsp + rdi*4]
mov eax, 0x80808081
mov r8d, dword [rsp + rdi*4]
add ecx, r14d
imul ecx
add r8d, ebp
add edx, ecx
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub ecx, eax
mov eax, 0x80808081
imul r8d
movsxd rcx, ecx
add edx, r8d
sar edx, 7
mov eax, edx
mov ecx, dword [rsp + rcx*4 + 0x400]
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub r8d, eax
movsxd rax, r8d
mov r8d, dword [rsp + rdi*4]
add r8d, r15d
mov r10d, dword [rsp + rax*4 + 0x400]
mov eax, 0x80808081
imul r8d
add edx, r8d
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub r8d, eax
movsxd rax, r8d
mov r8d, dword [rsp + rdi*4]
add r8d, esi
mov r11d, dword [rsp + rax*4 + 0x400]
mov eax, 0x80808081
imul r8d
add edx, r8d
sar edx, 7
mov eax, edx
shr eax, 0x1f
add edx, eax
imul eax, edx, 0xff
sub r8d, eax
movsxd rax, r8d
mov edx, dword [rsp + rax*4 + 0x400]
jmp 0x1402791f5
xor ecx, ecx
xor r10d, r10d
xor r11d, r11d
xor edx, edx
shl ecx, 8
xor ecx, r10d
shl ecx, 8
xor ecx, r11d
shl ecx, 8
xor ecx, edx
mov edx, ecx
mov dword [r12 + r9*4 + 0x65a470], ecx
shr edx, 0x18
shl ecx, 8
or edx, ecx
mov eax, edx
mov dword [r12 + r9*4 + 0x65a870], edx
shr eax, 0x18
shl edx, 8
or eax, edx
mov dword [r12 + r9*4 + 0x65ac70], eax
ror eax, 0x18
mov dword [r12 + r9*4 + 0x65b070], eax
inc r9
sub rbx, 1
jne 0x1402790b0
mov rcx, qword [rsp + 0x800]
xor rcx, rsp
call fcn.140283e40
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