AES128Stream.h

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/*
 * AES128Stream.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed 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 AES128STREAM_H_
#define AES128STREAM_H_

#include <streambuf>
#include <ostream>
#include <sys/types.h>
#include <stdint.h>
#include "ibrcommon/ssl/CipherStream.h"
#include "ibrcommon/ssl/gcm/gcm.h"

namespace ibrcommon
{
        class AES128Stream : public ibrcommon::CipherStream
        {
                public:
                        static const size_t key_size_in_bytes = 16;
                        static const size_t salt_len = sizeof(uint32_t);
                        static const size_t iv_len = 8;
                        static const size_t tag_len = 16;
                        static const size_t BUFF_SIZE = 2048;

                        AES128Stream(const CipherMode mode, std::ostream& output, const unsigned char key[key_size_in_bytes], const uint32_t salt);
                        AES128Stream(const CipherMode mode, std::ostream& output, const unsigned char key[key_size_in_bytes], const uint32_t salt, const unsigned char iv[iv_len]);

                        virtual ~AES128Stream();

                        void getIV(unsigned char (&to_iv)[iv_len]) const;

                        void getTag(unsigned char (&to_tag)[tag_len]);

                        bool verify(const unsigned char (&verify_tag)[tag_len]);

                protected:
                        virtual void encrypt(char *buf, const size_t size);
                        virtual void decrypt(char *buf, const size_t size);

                private:
                        typedef struct {
                                uint32_t salt;
                                unsigned char initialisation_vector[iv_len];
                        } gcm_iv;

                        gcm_iv _gcm_iv;

                        gcm_ctx _ctx;

                        unsigned char _used_initialisation_vector[iv_len];
        };
}

#endif /* AES128STREAM_H_ */