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

base/hmac.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Utility class for calculating the HMAC for a given message. We currently
 // only support SHA1 for the hash algorithm, but this can be extended easily.
 
 #ifndef BASE_HMAC_H_
 #define BASE_HMAC_H_
 #pragma once
@@ skipping 27 matching lines @@
   // Initializes this instance using |key|. Call Init only once. It returns
   // false on the second or later calls.
   bool Init(const std::string& key) {
     return Init(reinterpret_cast<const unsigned char*>(key.data()),
                 static_cast<int>(key.size()));
   }
 
   // Calculates the HMAC for the message in |data| using the algorithm supplied
   // 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.
-  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.
 
  private:
   HashAlgorithm hash_alg_;
   scoped_ptr<HMACPlatformData> plat_;
 
   DISALLOW_COPY_AND_ASSIGN(HMAC);
 };
 
 }  // namespace base
 
 #endif  // BASE_HMAC_H_