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      1 // Copyright 2015 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package x509
      6 
      7 import "syscall"
      8 
      9 func init() {
     10 	v, err := syscall.GetVersion()
     11 	if err != nil {
     12 		return
     13 	}
     14 	if major := byte(v); major < 6 {
     15 		// Windows XP SP2 and Windows 2003 do not support SHA2.
     16 		// http://blogs.technet.com/b/pki/archive/2010/09/30/sha2-and-windows.aspx
     17 		supportSHA2 = false
     18 	}
     19 }
     20