//

// DigestEngine.h

//

// Library: Crypto

// Package: Digest

// Module:  DigestEngine

//

// Definition of the DigestEngine class.

//

// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.

// and Contributors.

//

// SPDX-License-Identifier: BSL-1.0

//

#ifndef Crypto_DigestEngine_INCLUDED

#define Crypto_DigestEngine_INCLUDED

#include "Poco/Crypto/Crypto.h"

#include "Poco/Crypto/OpenSSLInitializer.h"

#include "Poco/DigestEngine.h"

#include <openssl/evp.h>

namespace Poco::Crypto {

class Crypto_API DigestEngine: public Poco::DigestEngine

  /// This class implements a Poco::DigestEngine for all

  /// digest algorithms supported by OpenSSL.

{

public:

  DigestEngine(const std::string& name);

    /// Creates a DigestEngine using the digest with the given name

    /// (e.g., "MD5", "SHA1", "SHA256", "SHA512", etc.).

    /// See the OpenSSL documentation for a list of supported digest algorithms.

    ///

    /// Throws a Poco::NotFoundException if no algorithm with the given name exists.

  ~DigestEngine();

    /// Destroys the DigestEngine.

  const std::string& algorithm() const;

    /// Returns the name of the digest algorithm.

  int nid() const;

    /// Returns the NID (OpenSSL object identifier) of the digest algorithm.

  // DigestEngine

  std::size_t digestLength() const;

  void reset();

  const Poco::DigestEngine::Digest& digest();

protected:

  void updateImpl(const void* data, std::size_t length);

private:

  std::string _name;

  EVP_MD_CTX* _pContext;

  Poco::DigestEngine::Digest _digest;

  OpenSSLInitializer _openSSLInitializer;

};

//

// inlines

//

inline const std::string& DigestEngine::algorithm() const

{

  return _name;

}

} // namespace Poco::Crypto

#endif // Crypto_DigestEngine_INCLUDED