MessageDigest.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _DECAF_SECURITY_MESSAGEDIGEST_H_
#define _DECAF_SECURITY_MESSAGEDIGEST_H_

#include <decaf/util/Config.h>

#include <decaf/security/MessageDigestSpi.h>
#include <decaf/nio/ByteBuffer.h>

#include <string>

namespace decaf {
namespace security {

    class MessageDigestSpi;
    class MessageDigestImpl;
    class Provider;

    class DECAF_API MessageDigest {
    private:

        MessageDigestImpl* impl;

        MessageDigestSpi* spi;
        const Provider* provider;
        std::string algorithm;

    private:

        MessageDigest(const MessageDigest&);
        MessageDigest& operator= (const MessageDigest&);

    protected:

        MessageDigest(const std::string& name);

    public:

        virtual ~MessageDigest();

        std::vector<unsigned char> digest();

        int digest(unsigned char* input, int size, int offset, int length);

        std::vector<unsigned char> digest(const unsigned char* input, int size);

        std::vector<unsigned char> digest(const std::vector<unsigned char>& input);

        std::string getAlgorithmName() const {
            return this->algorithm;
        }

        const Provider* getProvider() const {
            return this->provider;
        }

        int getDigestLength() const;

        MessageDigest* clone();

        void reset();

        std::string toString() const;

        void update(unsigned char input);

        void update(unsigned char* input, int size, int offset, int len);

        void update(const std::vector<unsigned char>& input);

        void update(nio::ByteBuffer& input);

    public:

        static MessageDigest* getInstance(const std::string& algorithm);

        static bool isEqual(const std::vector<unsigned char>& digesta,
                            const std::vector<unsigned char>& digestb);

    };

}}

#endif /* _DECAF_SECURITY_MESSAGEDIGEST_H_ */