Private API for extensions like ssh-client that need access to TCP.

crypto/hmac.h

Index: crypto/hmac.h
diff --git a/crypto/hmac.h b/crypto/hmac.h
index 7852797b20dc71fc1d96672e44f4cc1b04f27c56..c0706d8ebcf17d337ec16a293547dacdab7e0039 100644
--- a/crypto/hmac.h
+++ b/crypto/hmac.h
@@ -51,7 +51,9 @@ class HMAC {
   // to the constructor and the key supplied to the Init method. The HMAC is
   // returned in |digest|, which has |digest_length| bytes of storage available.
   // TODO(abarth): digest_length should be a size_t.
-  bool Sign(const std::string& data, unsigned char* digest, int digest_length);
+  bool Sign(const std::string& data,
+            unsigned char* digest,
+            int digest_length) const;
 
   // TODO(albertb): Add a Verify method.