From 7dd1a098a6db52ff628cb504303726ccddf945df Mon Sep 17 00:00:00 2001
From: technorama <technorama@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 29 Jan 2009 03:20:26 +0000
Subject: * lib/securerandom.rb: new method SecureRandom#uuid

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/securerandom.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib')

diff --git a/lib/securerandom.rb b/lib/securerandom.rb
index 0de118cb44..0582cee722 100644
--- a/lib/securerandom.rb
+++ b/lib/securerandom.rb
@@ -167,6 +167,16 @@ module SecureRandom
     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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