ibrcommon/ibrcommon/ssl/AES128Stream.h

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#ifndef AES128STREAM_H_
#define AES128STREAM_H_

#include <streambuf>
#include <ostream>
#include <sys/types.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(u_int32_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 u_int32_t salt);
                        AES128Stream(const CipherMode mode, std::ostream& output, const unsigned char key[key_size_in_bytes], const u_int32_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 {
                                u_int32_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_ */