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msg7086/v2ex-309785.rb

Created October 3, 2016 15:07
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v2ex-309785.rb
require 'digest'
md5 = '3bed22f7f496e84b035a996522baa7594c27c7e5718a78bfddf9012904b70eb755d67f90c8de149ead7ee674b024f38c216642030c2d54cb1dd657dd66342c99c239f3c31fd399fc052a9b7861f2073d2b9f47811dd77fd544d570c34bf5f349d110389979571714694a5054238465ca38ba26c25fb1a32b4d0a3b93666b09b3'
prefix = Digest::MD5.hexdigest 'v2ex'
str = ''
md5.scan(/.{32}/) { |m| str += [*'0'..'9',*'A'..'Z',*'a'..'z'].find { |s| Digest::MD5.hexdigest(prefix + str + s + Digest::MD5.hexdigest(str + s)) == m } }
puts str #=> csdaixie
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