.text .globl state .bss .type state, @object .size state, 1 state: .zero 1 .text .globl do_encrypt .type do_encrypt, @function do_encrypt: push rbp mov rbp, rsp mov eax, edi mov BYTE PTR [rbp-4], al movzx eax, BYTE PTR state[rip] add eax, 19 xor BYTE PTR [rbp-4], al movzx eax, BYTE PTR state[rip] add eax, 55 mov BYTE PTR state[rip], al movzx eax, BYTE PTR [rbp-4] pop rbp ret