1/*
2 * libjingle
3 * Copyright 2004--2012, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_BASE_OPENSSLDIGEST_H_
29#define TALK_BASE_OPENSSLDIGEST_H_
30
31#include <openssl/evp.h>
32
33#include "talk/base/messagedigest.h"
34
35namespace talk_base {
36
37// An implementation of the digest class that uses OpenSSL.
38class OpenSSLDigest : public MessageDigest {
39 public:
40  // Creates an OpenSSLDigest with |algorithm| as the hash algorithm.
41  explicit OpenSSLDigest(const std::string& algorithm);
42  ~OpenSSLDigest();
43  // Returns the digest output size (e.g. 16 bytes for MD5).
44  virtual size_t Size() const;
45  // Updates the digest with |len| bytes from |buf|.
46  virtual void Update(const void* buf, size_t len);
47  // Outputs the digest value to |buf| with length |len|.
48  virtual size_t Finish(void* buf, size_t len);
49
50  // Helper function to look up a digest.
51  static bool GetDigestEVP(const std::string &algorithm,
52                           const EVP_MD** md);
53  // Helper function to get the length of a digest.
54  static bool GetDigestSize(const std::string &algorithm,
55                            size_t* len);
56
57 private:
58  EVP_MD_CTX ctx_;
59  const EVP_MD* md_;
60};
61
62}  // namespace talk_base
63
64#endif  // TALK_BASE_OPENSSLDIGEST_H_
65