Move crypto files out of base, to a top level directory.

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
-
-#include <string>
-
-#include "base/base_api.h"
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace base {
-
-// Simplify the interface and reduce includes by abstracting out the internals.
-struct HMACPlatformData;
-
-class BASE_API HMAC {
- public:
-  // The set of supported hash functions. Extend as required.
-  enum HashAlgorithm {
-    SHA1,
-    SHA256,
-  };
-
-  explicit HMAC(HashAlgorithm hash_alg);
-  ~HMAC();
-
-  // Initializes this instance using |key| of the length |key_length|. Call Init
-  // only once. It returns false on the second or later calls.
-  bool Init(const unsigned char* key, int key_length);
-
-  // 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);
-
-  // 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_