newbie question: any better way to write this code?

[neoedmund]

i want to let a byte array to be xor with some value.
but code show below i wrote seems not so .. good..., any better way to
write such function? thanks.
[code]
def xor(buf):
        bout=[]
        for i in range(len(buf)):
                x = ord(buf[i])
                x ^= 123
                bout.append(chr(x))
        return "".join(buf)
buf = "xxxxxxxx".encode("utf8")
buf = xor(buf)

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