// simon.h - written and placed in the public domain by Jeffrey Walton

/// \file simon.h
/// \brief Classes for the Simon block cipher
/// \details Simon is a block cipher designed by Ray Beaulieu, Douglas Shors, Jason Smith,
///   Stefan Treatman-Clark, Bryan Weeks and Louis Wingers.
/// \sa <A HREF="http://eprint.iacr.org/2013/404">The SIMON and SPECK Families of
///   Lightweight Block Ciphers</A>, <A HREF="http://iadgov.github.io/simon-speck/">
///   The Simon and Speck GitHub</A> and <A HREF="https://www.cryptopp.com/wiki/SIMON">
///   SIMON</A> on the Crypto++ wiki.
/// \since Crypto++ 6.0

#ifndef CRYPTOPP_SIMON_H
#define CRYPTOPP_SIMON_H

#include "config.h"
#include "seckey.h"
#include "secblock.h"

#if CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64
# define CRYPTOPP_SIMON64_ADVANCED_PROCESS_BLOCKS 1
#endif

#if CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64
# define CRYPTOPP_SIMON128_ADVANCED_PROCESS_BLOCKS 1
#endif

NAMESPACE_BEGIN(CryptoPP)

/// \brief SIMON block cipher information
/// \tparam L block size of the cipher, in bytes
/// \tparam D default key length, in bytes
/// \tparam N minimum key length, in bytes
/// \tparam M maximum key length, in bytes
/// \since Crypto++ 6.0
template <unsigned int L, unsigned int D, unsigned int N, unsigned int M>
struct SIMON_Info : public FixedBlockSize<L>, VariableKeyLength<D, N, M>
{
    static const std::string StaticAlgorithmName()
    {
        // Format is Cipher-Blocksize(Keylength)
        return "SIMON-" + IntToString(L*8);
    }
};

/// \brief SIMON block cipher base class
/// \tparam W the word type
/// \details User code should use SIMON64 or SIMON128
/// \sa SIMON64, SIMON128, <a href="http://www.cryptopp.com/wiki/SIMON">SIMON</a> on the Crypto++ wiki
/// \since Crypto++ 6.0
template <class W>
struct SIMON_Base
{
    virtual ~SIMON_Base() {}
SIMON_Base() : m_kwords(0), m_rounds(0) {}

    typedef SecBlock<W, AllocatorWithCleanup<W, true> > AlignedSecBlock;
    mutable AlignedSecBlock m_wspace;  // workspace
    AlignedSecBlock         m_rkeys;   // round keys
    unsigned int            m_kwords;  // number of key words
    unsigned int            m_rounds;  // number of rounds
};

/// \brief SIMON 64-bit block cipher
/// \details Simon is a block cipher designed by Ray Beaulieu, Douglas Shors, Jason Smith,
///   Stefan Treatman-Clark, Bryan Weeks and Louis Wingers.
/// \details SIMON64 provides 64-bit block size. The valid key sizes are 96-bit and 128-bit.
/// \sa SIMON64, SIMON128,  <A HREF="http://eprint.iacr.org/2013/404">The SIMON and SIMON
///   Families of Lightweight Block Ciphers</A>, <A HREF="http://iadgov.github.io/simon-speck/">
///   The Simon and Speck GitHub</A>, <a href="http://www.cryptopp.com/wiki/SIMON">SIMON</a> on the
///   Crypto++ wiki
/// \since Crypto++ 6.0
class CRYPTOPP_NO_VTABLE SIMON64 : public SIMON_Info<8, 12, 12, 16>, public BlockCipherDocumentation
{
public:
    /// \brief SIMON block cipher transformation functions
    /// \details Provides implementation common to encryption and decryption
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Base : protected SIMON_Base<word32>, public BlockCipherImpl<SIMON_Info<8, 12, 12, 16> >
    {
    public:
        std::string AlgorithmName() const {
            return StaticAlgorithmName() + (m_kwords == 0 ? "" :
                "(" + IntToString(m_kwords*sizeof(word32)*8) + ")");
        }

    protected:
        void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs &params);
    };

    /// \brief Provides implementation for encryption transformation
    /// \details Enc provides implementation for encryption transformation. All key
    ///   sizes are supported.
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Enc : public Base
    {
    protected:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_SIMON64_ADVANCED_PROCESS_BLOCKS
        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
    };

    /// \brief Provides implementation for encryption transformation
    /// \details Dec provides implementation for decryption transformation. All key
    ///   sizes are supported.
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Dec : public Base
    {
    protected:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_SIMON64_ADVANCED_PROCESS_BLOCKS
        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
    };

    typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
    typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};

/// \brief SIMON 128-bit block cipher
/// \details Simon is a block cipher designed by Ray Beaulieu, Douglas Shors, Jason Smith,
///   Stefan Treatman-Clark, Bryan Weeks and Louis Wingers.
/// \details SIMON128 provides 128-bit block size. The valid key sizes are 128-bit, 192-bit and 256-bit.
/// \sa SIMON64, SIMON128,  <A HREF="http://eprint.iacr.org/2013/404">The SIMON and SIMON
///   Families of Lightweight Block Ciphers</A>, <A HREF="http://iadgov.github.io/simon-speck/">
///   The Simon and Speck GitHub</A>, <a href="http://www.cryptopp.com/wiki/SIMON">SIMON</a> on the
///   Crypto++ wiki
/// \since Crypto++ 6.0
class CRYPTOPP_NO_VTABLE SIMON128 : public SIMON_Info<16, 16, 16, 32>, public BlockCipherDocumentation
{
public:
    /// \brief SIMON block cipher transformation functions
    /// \details Provides implementation common to encryption and decryption
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Base : protected SIMON_Base<word64>, public BlockCipherImpl<SIMON_Info<16, 16, 16, 32> >
    {
    public:
        std::string AlgorithmName() const {
            return StaticAlgorithmName() + (m_kwords == 0 ? "" :
                "(" + IntToString(m_kwords*sizeof(word64)*8) + ")");
        }

    protected:
        void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs &params);
    };

    /// \brief Provides implementation for encryption transformation
    /// \details Enc provides implementation for encryption transformation. All key
    ///   sizes are supported.
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Enc : public Base
    {
    protected:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_SIMON128_ADVANCED_PROCESS_BLOCKS
        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
    };

    /// \brief Provides implementation for encryption transformation
    /// \details Dec provides implementation for decryption transformation. All key
    ///   sizes are supported.
    /// \since Crypto++ 6.0
    class CRYPTOPP_NO_VTABLE Dec : public Base
    {
    protected:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_SIMON128_ADVANCED_PROCESS_BLOCKS
        size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
    };

    typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
    typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};

NAMESPACE_END

#endif  // CRYPTOPP_SIMON_H