technorama	2009-01-29 12:20:26 +0900 (Thu, 29 Jan 2009)

  New Revision: 21868

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=21868

  Log:
    * lib/securerandom.rb: new method SecureRandom#uuid

  Modified files:
    trunk/ChangeLog
    trunk/lib/securerandom.rb

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 21867)
+++ ChangeLog	(revision 21868)
@@ -1,3 +1,7 @@
+Thu Jan 29 12:18:54 2009  Technorama Ltd.  <oss-ruby@t...>
+
+	* lib/securerandom.rb: new method SecureRandom#uuid
+
 Thu Jan 29 11:22:19 2009  NAKAMURA Usaku  <usa@r...>
 
 	* ext/socket/raddrinfo.c (inspect_sockaddr): if defined AF_INET6,
Index: lib/securerandom.rb
===================================================================
--- lib/securerandom.rb	(revision 21867)
+++ lib/securerandom.rb	(revision 21868)
@@ -167,6 +167,16 @@
     end
   end
 
+  # SecureRandom.uuid generates a v4 random UUID.
+  def self.uuid
+    str = self.random_bytes(16)
+    str[6] = (str[6] & 0x0f) | 0x40
+    str[8] = (str[8] & 0x3f) | 0x80
+
+    ary = str.unpack("NnnnnN")
+    "%08x-%04x-%04x-%04x-%04x%08x" % ary
+  end
+
   # Following code is based on David Garamond's GUID library for Ruby.
   def self.lastWin32ErrorMessage # :nodoc:
     get_last_error = Win32API.new("kernel32", "GetLastError", '', 'L')

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