8dXTiH5U

1require 'openssl'
2require 'base64'
3
4class UserEncrypted < ActiveRecord::Base
5  PADDING = { 2 => "==", 3 => "=" }
6  def to_param
7    crypto = OpenSSL::Cipher::Cipher.new('aes-256-ecb').send(:encrypt)
8    crypto.key = SECRET_KEY
9    cipher = crypto.update(id.to_s)
10    cipher << crypto.final
11
12    cipher = Base64.encode64(cipher).gsub(/[\s=]+/, "").gsub("+", "-").gsub("/", "_")
13  end
14
15  class << self
16    def find_by_encrypted_id(encrypted_data)
17      encrypted_data = Base64.decode64("#{encrypted_data.gsub("-", "+").gsub("_", "/")}#{PADDING[encrypted_data.length % 4]}")
18
19      crypto = OpenSSL::Cipher::Cipher.new('aes-256-ecb').send(:decrypt)
20      crypto.key = SECRET_KEY
21      id = crypto.update(encrypted_data)
22      id << crypto.final
23
24      find_by_id(id)
25    end
26  end
27end