Function at 0x1800039e4
Capabilities:
Encode data using xor
Encrypt data using aes
Reference aes constants

Disassembly:
mov qword [rsp + 8], rbx
xor r9b, r9b
movzx r11d, cl
shl r11d, 2
mov rbx, r8
movzx r8d, r9b
xor r10b, r10b
add r8d, r11d
shl r8d, 2
movzx eax, r10b
inc r10b
add eax, r8d
mov cl, byte [rax + rbx]
xor byte [rdx], cl
inc rdx
cmp r10b, 4
jb 0x1800039bd
inc r9b
cmp r9b, 4
jb 0x1800039af
mov rbx, qword [rsp + 8]
ret
mov qword [rsp + 8], rbx
mov qword [rsp + 0x10], rbp
mov qword [rsp + 0x18], rsi
push rdi
push r12
push r13
push r14
push r15
sub rsp, 0x20
mov rbp, rdx
mov r8, rdx
mov rdx, rcx
mov rbx, rcx
xor ecx, ecx
call 0x18000399c
mov dil, 1
lea rsi, [rbx + 2]
mov r12d, 4
lea r13, [0x180030cf0]
mov rdx, rbx
mov r9, r12
mov rcx, rdx
mov r8, r12
movzx eax, byte [rcx]
mov al, byte [rax + r13]
mov byte [rcx], al
add rcx, r12
sub r8, 1
jne 0x180003a33
inc rdx
sub r9, 1
jne 0x180003a2d
mov al, byte [rbx + 5]
mov r14, rsi
mov cl, byte [rbx + 1]
mov r15, r12
mov byte [rbx + 1], al
mov al, byte [rbx + 9]
mov byte [rbx + 5], al
mov al, byte [rbx + 0xd]
mov byte [rbx + 9], al
mov al, byte [rbx + 0xa]
mov byte [rbx + 0xd], cl
mov cl, byte [rsi]
mov byte [rsi], al
mov al, byte [rbx + 0xe]
mov byte [rbx + 0xa], cl
mov cl, byte [rbx + 6]
mov byte [rbx + 6], al
mov al, byte [rbx + 0xf]
mov byte [rbx + 0xe], cl
mov cl, byte [rbx + 3]
mov byte [rbx + 3], al
mov al, byte [rbx + 0xb]
mov byte [rbx + 0xf], al
mov al, byte [rbx + 7]
mov byte [rbx + 0xb], al
mov byte [rbx + 7], cl
mov r11b, byte [r14 - 2]
mov r8b, byte [r14 - 1]
mov dl, r11b
mov r9b, byte [r14 + 1]
xor dl, r8b
xor r9b, byte [r14]
mov al, dl
shr al, 7
add dl, dl
movzx eax, al
mov r10b, r9b
imul ecx, eax, 0x1b
xor r10b, r11b
xor r10b, r8b
xor cl, dl
mov dl, r8b
xor dl, byte [r14]
xor cl, r11b
xor r11b, byte [r14 + 1]
xor cl, r10b
mov byte [r14 - 2], cl
mov al, dl
shr al, 7
add dl, dl
movzx eax, al
imul ecx, eax, 0x1b
mov al, r9b
shr al, 7
add r9b, r9b
movzx eax, al
xor cl, dl
xor cl, r8b
xor cl, r10b
mov byte [r14 - 1], cl
imul ecx, eax, 0x1b
mov al, r11b
shr al, 7
add r11b, r11b
movzx eax, al
xor cl, r9b
xor cl, byte [r14]
xor cl, r10b
mov byte [r14], cl
imul ecx, eax, 0x1b
xor cl, r11b
xor cl, byte [r14 + 1]
xor cl, r10b
mov byte [r14 + 1], cl
add r14, r12
sub r15, 1
jne 0x180003a9a
mov r8, rbp
mov rdx, rbx
mov cl, dil
call 0x18000399c
inc dil
cmp dil, 0xe
jb 0x180003a27
mov rdx, rbx
mov r8, r12
mov rcx, rdx
mov r9, r12
movzx eax, byte [rcx]
mov al, byte [rax + r13]
mov byte [rcx], al
add rcx, r12
sub r9, 1
jne 0x180003b60
inc rdx
sub r8, 1
jne 0x180003b5a
mov dl, byte [rbx + 6]
mov r8, rbp
mov al, byte [rbx + 5]
mov cl, byte [rbx + 1]
mov byte [rbx + 1], al
mov al, byte [rbx + 9]
mov byte [rbx + 5], al
mov al, byte [rbx + 0xd]
mov byte [rbx + 9], al
mov al, byte [rbx + 0xa]
mov byte [rbx + 0xd], cl
mov cl, byte [rsi]
mov byte [rsi], al
mov al, byte [rbx + 0xe]
mov byte [rbx + 6], al
mov al, byte [rbx + 0xf]
mov byte [rbx + 0xe], dl
mov dl, byte [rbx + 3]
mov byte [rbx + 3], al
mov al, byte [rbx + 0xb]
mov byte [rbx + 0xf], al
mov al, byte [rbx + 7]
mov byte [rbx + 7], dl
mov rdx, rbx
mov byte [rbx + 0xa], cl
mov cl, 0xe
mov byte [rbx + 0xb], al
mov rbx, qword [rsp + 0x50]
mov rbp, qword [rsp + 0x58]
mov rsi, qword [rsp + 0x60]
add rsp, 0x20
pop r15
pop r14
pop r13
pop r12
pop rdi
jmp 0x18000399c