A hello world for encrypted binary obfuscation

;
; A hello world for encrypted binary obfuscation
;   Brought to you by MadMouse
; Play like this:
;   nasm -f elf64 hello.s -o hello.o
;   ld -N hello.o -o hello


[bits 64]
section .text
global _start
_start:
    call main
    ; key data
    db 0x7b,0xcb,0xdd,0x3e,0xbe,0x0b,0x43,0xb4,0x99,0x6b,0xa7,0xbe
    db 0x0e,0x27,0x26,0xb0,0xdb,0x98,0xea,0x86,0xdf,0x20,0x68,0x15
    db 0x2f,0x9b,0x4e,0x5c,0x04,0x39,0x20,0x03,0xdb,0xa5,0x7c,0xcb
    db 0xa8,0x22
    ; encrypted code:
    db 0x93,0xc7,0xdd,0x3e,0xbe,0x63,0x26,0xd8,0xf5,0x04,0x87,0xc9
    db 0x61,0x55,0x4a,0xd4,0xd1,0xc6,0x5a,0xd8,0x6f,0x21,0x28,0x9d
    db 0xe8,0x29,0x42,0x53,0x01,0x89,0x1c,0x4b,0xea,0x5a,0x73,0xce
    db 0xa8,0x09

main:
    pop rsi         ; pop the address of our data
    mov cl, 38      ; set loop count to the size of the encrypted data
decode:
    mov al, byte [rsi]  ; load character from key into al
    xor byte [rsi+38], al   ; xor the key with the encrypted code
    inc rsi         ; increment our address
loop decode
    jmp rsi         ; jump into our decrypted code :D