ruby md5 sha1 base64加密

#md5加密
require 'md5' 
puts MD5.hexdigest('admin')
 
#sha1加密
require 'digest/sha1' 
puts Digest::SHA1.hexdigest('admin')
 
#baserequire 'base64' 
code = Base64.encode64('admin') 
source = Base64.decode64(code)

Digest::MD5.hexdigest(request.remote_ip + params[:teacher][:number] + Time.now.strftime("%Y-%m-%d"))