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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// 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__
#include <windows.h>
#include <wincrypt.h>
#include <string>
#include "base/basictypes.h"
class HMAC {
public:
// The set of supported hash functions. Extend as required.
enum HashAlgorithm {
SHA1
};
HMAC(HashAlgorithm hash_alg, const unsigned char* key, int key_length);
~HMAC();
// Returns the HMAC in 'digest' for the message in 'data' and the key
// specified in the contructor.
bool Sign(const std::string& data, unsigned char* digest, int digest_length);
private:
// Import the key so that we don't have to store it ourself.
// TODO(paulg): Bug: http://b/1084719, 'ImportKey' will not currently work on
// Windows 2000 since it requires special handling for importing
// keys. See this link for details:
// http://www.derkeiler.com/Newsgroups/microsoft.public.platformsdk.security/2004-06/0270.html
void ImportKey(const unsigned char* key, int key_length);
// Returns the SHA1 hash of 'data' and 'key' in 'digest'. If there was any
// error in the calculation, this method returns false, otherwise true.
bool SignWithSHA1(const std::string& data,
unsigned char* digest,
int digest_length);
// Required for the SHA1 key_blob struct. We limit this to 16 bytes since
// Windows 2000 doesn't support keys larger than that.
static const int kMaxKeySize = 16;
// The hash algorithm to use.
HashAlgorithm hash_alg_;
// Windows Crypt API resources.
HCRYPTPROV provider_;
HCRYPTHASH hash_;
HCRYPTKEY hkey_;
DISALLOW_EVIL_CONSTRUCTORS(HMAC);
};
#endif // BASE_HMAC_H__
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