Ruby Md5
require 'digest'
# Compute a complete digest
Digest::MD5.hexdigest 'abc' #=> "90015098..."
# Compute digest by chunks
md5 = Digest::MD5.new # =>#<Digest::MD5>
md5.update "ab"
md5 << "c" # alias for #update
md5.hexdigest # => "90015098..."
# Use the same object to compute another digest
md5.reset
md5 << "message"
md5.hexdigest # => "78e73102..."
Marcin Zientkowski