pRevert 5371 "Revert 5367 "Update talk to 59410372.""

> Revert 5367 "Update talk to 59410372."
> 
> > Update talk to 59410372.
> > 
> > R=jiayl@webrtc.org, wu@webrtc.org
> > 
> > Review URL: https://webrtc-codereview.appspot.com/6929004
> 
> TBR=mallinath@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/6999004

TBR=henrika@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7109004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5381 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/base/messagedigest.h b/talk/base/messagedigest.h
index 734082b..e8f303f 100644
--- a/talk/base/messagedigest.h
+++ b/talk/base/messagedigest.h
@@ -60,6 +60,9 @@
   static MessageDigest* Create(const std::string& alg);
 };
 
+// A whitelist of approved digest algorithms from RFC 4572 (FIPS 180).
+bool IsFips180DigestAlgorithm(const std::string& alg);
+
 // Functions to create hashes.
 
 // Computes the hash of |in_len| bytes of |input|, using the |digest| hash