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copied!<p>If you would be equally happy with <code>unpack('B*')</code> with msb first binary numbers (which you could well be if all your processing is circular), then you could also use <code>.unpack('Q>')</code> instead of <code>.unpack('B*')[0].to_i(2)</code> for generating <code>pt</code>:</p> <pre><code>pt = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890!@" # Your version (with 'B' == msb first) for comparison: pt_nums = pt.chars.each_slice(N/8).map {|x| x.join.unpack('B*')[0].to_i(2)}.to_a => [8176115190769218921, 8030025283835160424, 7668342063789995618, 7957105551900562521, 6145530372635706438, 5136437062280042563, 6215616529169527604, 3834312847369707840] # unpack to 64-bit unsigned integers directly pt_nums = pt.unpack('Q>8') => [8176115190769218921, 8030025283835160424, 7668342063789995618, 7957105551900562521, 6145530372635706438, 5136437062280042563, 6215616529169527604, 3834312847369707840] </code></pre> <p>There are no native 128-bit pack/unpacks to return in the other direction, but you can use <code>Fixnum</code> to solve this too:</p> <pre><code>split128 = 1 << 64 ct = pt # Just to show round-trip ct.map { |x| [ x / split128, x % split128 ].pack('Q>2') }.join => "\x00\x00\x00\x00\x00\x00\x00\x00qwertyui . . . " # truncated </code></pre> <p>This avoids a lot of the temporary stages on your code, but at the expense of using a different byte coding - I don't know enough about SIMON to comment whether this is adaptable to your needs.</p>

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