comparison lib/redmine/.svn/text-base/ciphering.rb.svn-base @ 245:051f544170fe

* Update to SVN trunk revision 4993

+# Redmine - project management software
+# Copyright (C) 2006-2011  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module Redmine
+  module Ciphering
+    def self.included(base) 
+      base.extend ClassMethods
+    end
+    
+    class << self
+      def encrypt_text(text)
+        if cipher_key.blank?
+          text
+        else
+          c = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
+          iv = c.random_iv
+          c.encrypt
+          c.key = cipher_key
+          c.iv = iv
+          e = c.update(text.to_s)
+          e << c.final
+          "aes-256-cbc:" + [e, iv].map {|v| Base64.encode64(v).strip}.join('--')
+        end
+      end
+      
+      def decrypt_text(text)
+        if text && match = text.match(/\Aaes-256-cbc:(.+)\Z/)
+          text = match[1]
+          c = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
+          e, iv = text.split("--").map {|s| Base64.decode64(s)}
+          c.decrypt
+          c.key = cipher_key
+          c.iv = iv
+          d = c.update(e)
+          d << c.final
+        else
+          text
+        end
+      end
+      
+      def cipher_key
+        key = Redmine::Configuration['database_cipher_key'].to_s
+        key.blank? ? nil : Digest::SHA256.hexdigest(key)
+      end
+    end
+  
+    module ClassMethods
+      def encrypt_all(attribute)
+        transaction do
+          all.each do |object|
+            clear = object.send(attribute)
+            object.send "#{attribute}=", clear
+            raise(ActiveRecord::Rollback) unless object.save(false)
+          end
+        end ? true : false
+      end
+      
+      def decrypt_all(attribute)
+        transaction do
+          all.each do |object|
+            clear = object.send(attribute)
+            object.write_attribute attribute, clear
+            raise(ActiveRecord::Rollback) unless object.save(false)
+          end
+        end
+      end ? true : false
+    end
+    
+    private
+    
+    # Returns the value of the given ciphered attribute
+    def read_ciphered_attribute(attribute)
+      Redmine::Ciphering.decrypt_text(read_attribute(attribute))
+    end
+    
+    # Sets the value of the given ciphered attribute
+    def write_ciphered_attribute(attribute, value)
+      write_attribute(attribute, Redmine::Ciphering.encrypt_text(value))
+    end
+  end
+end