Ascon128.h

/*
 * Copyright (C) 2018 Southern Storm Software, Pty Ltd.
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 * copy of this software and associated documentation files (the "Software"),
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 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
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#ifndef CRYPTO_ASCON128_H
#define CRYPTO_ASCON128_H
 
#include "AuthenticatedCipher.h"
 
class Ascon128 : public AuthenticatedCipher
{
public:
    Ascon128();
    virtual ~Ascon128();
 
    size_t keySize() const;
    size_t ivSize() const;
    size_t tagSize() const;
 
    bool setKey(const uint8_t *key, size_t len);
    bool setIV(const uint8_t *iv, size_t len);
 
    void encrypt(uint8_t *output, const uint8_t *input, size_t len);
    void decrypt(uint8_t *output, const uint8_t *input, size_t len);
 
    void addAuthData(const void *data, size_t len);
 
    void computeTag(void *tag, size_t len);
    bool checkTag(const void *tag, size_t len);
 
    void clear();
 
private:
    struct {
        uint64_t K[2];
        uint64_t S[5];
    } state;
    uint8_t posn;
    uint8_t authMode;
 
    void permute(uint8_t first);
    void endAuth();
};
 
#endif