rubyでbin2hexとhex2bin

phpのhex2binとbin2hexに該当する処理をrubyでぱっと実現。

def hex2bin(value)
  [value].pack "H*"
end

def bin2hex(value)
  value.unpack "H*"
end

参考

• https://stackoverflow.com/questions/5244414/shortest-hex2bin-in-ruby