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/*
* libjingle
* Copyright 2004--2012, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef TALK_BASE_OPENSSLDIGEST_H_
#define TALK_BASE_OPENSSLDIGEST_H_
#include <openssl/evp.h>
#include "talk/base/messagedigest.h"
namespace talk_base {
// An implementation of the digest class that uses OpenSSL.
class OpenSSLDigest : public MessageDigest {
public:
// Creates an OpenSSLDigest with |algorithm| as the hash algorithm.
explicit OpenSSLDigest(const std::string& algorithm);
~OpenSSLDigest();
// Returns the digest output size (e.g. 16 bytes for MD5).
virtual size_t Size() const;
// Updates the digest with |len| bytes from |buf|.
virtual void Update(const void* buf, size_t len);
// Outputs the digest value to |buf| with length |len|.
virtual size_t Finish(void* buf, size_t len);
// Helper function to look up a digest's EVP by name.
static bool GetDigestEVP(const std::string &algorithm,
const EVP_MD** md);
// Helper function to look up a digest's name by EVP.
static bool GetDigestName(const EVP_MD* md,
std::string* algorithm);
// Helper function to get the length of a digest.
static bool GetDigestSize(const std::string &algorithm,
size_t* len);
private:
EVP_MD_CTX ctx_;
const EVP_MD* md_;
};
} // namespace talk_base
#endif // TALK_BASE_OPENSSLDIGEST_H_
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