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#!/usr/bin/rexx

parse arg ifn   -- get input filename
input_stream = .stream~new(ifn)
message_digest = .md5~new
do while input_stream~chars>0
  -- calculate digest in chunks of 256 bytes
  message_digest~update(input_stream~charin(,256))
end
say message_digest~digest
exit

::requires "md5.cls"
If you feel inclined to make corrections, suggestions etc., please mail me any.
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