technorama	2009-01-29 12:20:35 +0900 (Thu, 29 Jan 2009)

  New Revision: 21869

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=21869

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

  Modified files:
    branches/ruby_1_8/ChangeLog
    branches/ruby_1_8/lib/securerandom.rb

Index: ruby_1_8/ChangeLog
===================================================================
--- ruby_1_8/ChangeLog	(revision 21868)
+++ ruby_1_8/ChangeLog	(revision 21869)
@@ -1,3 +1,7 @@
+Thu Jan 29 12:18:54 2009  Technorama Ltd.  <oss-ruby@t...>
+
+	* lib/securerandom.rb: new method SecureRandom#uuid
+
 Wed Jan 28 01:16:50 2009  Masatoshi SEKI  <m_seki@m...>
 
 	* lib/erb.rb (def_erb_method): pass the trim_mode  [Feature #1032]
Index: ruby_1_8/lib/securerandom.rb
===================================================================
--- ruby_1_8/lib/securerandom.rb	(revision 21868)
+++ ruby_1_8/lib/securerandom.rb	(revision 21869)
@@ -134,4 +134,14 @@
       Math.ldexp(i64 >> (64-Float::MANT_DIG), -Float::MANT_DIG)
     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
 end

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