95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
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#ifndef __LowMC_h__
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#define __LowMC_h__
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// Vendored from https://github.com/LowMC/lowmc
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// commit e847fb160ad8ca1f373efd91a55b6d67f7deb425
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// Local changes: namespace lowmc, and the parameters below.
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// LowMCv3 instance for a 128-bit block and key with 10 S-boxes, at data
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// complexity 2^128: `determine_rounds.py 128 10 128 128` reports 32 rounds.
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#include <bitset>
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#include <vector>
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#include <string>
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namespace lowmc {
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const unsigned numofboxes = 10; // Number of Sboxes
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const unsigned blocksize = 128; // Block size in bits
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const unsigned keysize = 128; // Key size in bits
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const unsigned rounds = 32; // Number of rounds
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const unsigned identitysize = blocksize - 3*numofboxes;
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// Size of the identity part in the Sbox layer
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typedef std::bitset<blocksize> block; // Store messages and states
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typedef std::bitset<keysize> keyblock;
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class LowMC {
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public:
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LowMC (keyblock k = 0) {
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key = k;
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instantiate_LowMC();
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keyschedule();
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};
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block encrypt (const block message);
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block decrypt (const block message);
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void set_key (keyblock k);
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void print_matrices();
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private:
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// LowMC private data members //
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// The Sbox and its inverse
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const std::vector<unsigned> Sbox =
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{0x00, 0x01, 0x03, 0x06, 0x07, 0x04, 0x05, 0x02};
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const std::vector<unsigned> invSbox =
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{0x00, 0x01, 0x07, 0x02, 0x05, 0x06, 0x03, 0x04};
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std::vector<std::vector<block>> LinMatrices;
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// Stores the binary matrices for each round
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std::vector<std::vector<block>> invLinMatrices;
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// Stores the inverses of LinMatrices
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std::vector<block> roundconstants;
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// Stores the round constants
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keyblock key = 0;
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//Stores the master key
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std::vector<std::vector<keyblock>> KeyMatrices;
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// Stores the matrices that generate the round keys
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std::vector<block> roundkeys;
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// Stores the round keys
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// LowMC private functions //
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block Substitution (const block message);
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// The substitution layer
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block invSubstitution (const block message);
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// The inverse substitution layer
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block MultiplyWithGF2Matrix
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(const std::vector<block> matrix, const block message);
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// For the linear layer
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block MultiplyWithGF2Matrix_Key
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(const std::vector<keyblock> matrix, const keyblock k);
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// For generating the round keys
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void keyschedule ();
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//Creates the round keys from the master key
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void instantiate_LowMC ();
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//Fills the matrices and roundconstants with pseudorandom bits
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// Binary matrix functions //
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unsigned rank_of_Matrix (const std::vector<block> matrix);
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unsigned rank_of_Matrix_Key (const std::vector<keyblock> matrix);
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std::vector<block> invert_Matrix (const std::vector<block> matrix);
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// Random bits functions //
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block getrandblock ();
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keyblock getrandkeyblock ();
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bool getrandbit ();
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};
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} // namespace lowmc
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#endif
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