ruby暗号化と符号化

md5

 require 'md5'
 puts MD5.hexdigest('')

sha1

require 'digest/sha1'
puts Digest::SHA1.hexdigest('') 

base64

require 'base64'
code = Base64.encode64('hallo')
source = Base64.decode64(code)

uri

src = 'abc  asdf'
code = URI.encode src
src = URI.decode code
puts code
puts src