#include "aesbase.hpp"

std::vector<unsigned char> aes_base::encrypt(std::vector<unsigned char> PlainMatrix, std::vector<unsigned char> & RoundKeyMatrix){
    bool Inverse = false;
    std::vector<unsigned char> Matrix = PlainMatrix;
    _add_round_key(Matrix,RoundKeyMatrix.begin());
    for(unsigned i = 1; i <= _RoundNumber; i++){
        _byte_sub(Matrix,Inverse);
        _shift_row(Matrix,Inverse);
        _mix_columns(Matrix,Inverse);
        _add_round_key(Matrix,RoundKeyMatrix.begin()+(i*_MatDim));
    }
    _byte_sub(Matrix,Inverse);
    _shift_row(Matrix,Inverse);
    _add_round_key(Matrix,RoundKeyMatrix.begin()+(_RoundNumber*_MatDim));
    return Matrix;
}

std::vector<unsigned char> aes_base::decrypt(std::vector<unsigned char> CipherMatrix, std::vector<unsigned char> & RoundKeyMatrix){
    bool Inverse = true;
    std::vector<unsigned char> Matrix = CipherMatrix;
    _add_round_key(Matrix,RoundKeyMatrix.begin());
    _shift_row(Matrix,Inverse);
    _byte_sub(Matrix,Inverse);
    for(unsigned i = 1; i <= _RoundNumber; i++){
        _add_round_key(Matrix,RoundKeyMatrix.begin()+(i*_MatDim));
        _mix_columns(Matrix,Inverse);
        _shift_row(Matrix,Inverse);
        _byte_sub(Matrix,Inverse);
    }
    _add_round_key(Matrix,RoundKeyMatrix.begin()+(_RoundNumber*_MatDim));
    return Matrix;
}

void aes_base::_byte_sub(std::vector<unsigned char> & Matrix, bool Inverse){
    unsigned Left = 240, Right = 15;
    if(Inverse == false){
        std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[Left,Right](unsigned char & Value){
            return _SBox[(Value^Left) >> _MatDim][(Value^Right)];
        });
    }
    else{
        std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[Left,Right](unsigned char & Value){
            return _SBoxInv[(Value^Left) >> _MatDim][(Value^Right)];
        });
    }
}

void aes_base::_shift_row(std::vector<unsigned char> & Matrix, bool Inverse){
    unsigned _MatDim = 4;
    if(Inverse == false){
        for(unsigned i = 1; i < _MatDim; i++){
            std::rotate(Matrix.begin()+(i*_MatDim),Matrix.begin()+(i*_MatDim)+i,Matrix.begin()+((i+1)*_MatDim));
        }
    }
    else{
        for(unsigned i = 1; i < _MatDim; i++){
            std::rotate(Matrix.begin()+(i*_MatDim),Matrix.begin()+((i+1)*_MatDim)-i,Matrix.begin()+((i+1)*_MatDim));
        }
    }
}

void aes_base::_mix_columns(std::vector<unsigned char> & Matrix, bool Inverse){
    if(Inverse == false){
        for(unsigned i = 0; i < _MatDim; i++){
            Matrix[i*_MatDim+0] = _g_mul(Matrix[i*_MatDim+0],2)^_g_mul(Matrix[i*_MatDim+1],3)^_g_mul(Matrix[i*_MatDim+2],1)^_g_mul(Matrix[i*_MatDim+3],1);
            Matrix[i*_MatDim+1] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],2)^_g_mul(Matrix[i*_MatDim+2],3)^_g_mul(Matrix[i*_MatDim+3],1);
            Matrix[i*_MatDim+2] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],1)^_g_mul(Matrix[i*_MatDim+2],2)^_g_mul(Matrix[i*_MatDim+3],3);
            Matrix[i*_MatDim+3] = _g_mul(Matrix[i*_MatDim+0],1)^_g_mul(Matrix[i*_MatDim+1],1)^_g_mul(Matrix[i*_MatDim+2],1)^_g_mul(Matrix[i*_MatDim+3],2);
        }
    }
    else{
        for(unsigned i = 0; i < _MatDim; i++){
            Matrix[i*_MatDim+0] = _g_mul(Matrix[i*_MatDim+0],14)^_g_mul(Matrix[i*_MatDim+1],11)^_g_mul(Matrix[i*_MatDim+2],13)^_g_mul(Matrix[i*_MatDim+3],9);
            Matrix[i*_MatDim+1] = _g_mul(Matrix[i*_MatDim+0],9)^_g_mul(Matrix[i*_MatDim+1],14)^_g_mul(Matrix[i*_MatDim+2],11)^_g_mul(Matrix[i*_MatDim+3],13);
            Matrix[i*_MatDim+2] = _g_mul(Matrix[i*_MatDim+0],13)^_g_mul(Matrix[i*_MatDim+1],9)^_g_mul(Matrix[i*_MatDim+2],14)^_g_mul(Matrix[i*_MatDim+3],11);
            Matrix[i*_MatDim+3] = _g_mul(Matrix[i*_MatDim+0],11)^_g_mul(Matrix[i*_MatDim+1],13)^_g_mul(Matrix[i*_MatDim+2],9)^_g_mul(Matrix[i*_MatDim+3],14);
        }
    }
}

void aes_base::_add_round_key(std::vector<unsigned char> & Matrix, std::vector<unsigned char>::iterator MatBegin){
    std::transform(Matrix.begin(),Matrix.end(),Matrix.begin(),[&MatBegin](unsigned char & Value){
        return Value^*(MatBegin++);
    });
}

unsigned char aes_base::_g_mul(unsigned char Value, unsigned char Factor){
    if(Factor == 1){
        return Value;
    }
    else if(Factor == 2){
        if(Value < 128){
            return 2*Value;
        }
        else{
            return (2*Value)^(0x11b);
        }
    }
    else if(Factor == 3){
        return _g_mul(Value,2)^Value;
    }
    else if(Factor == 9){
        return _g_mul(_g_mul(_g_mul(Value,2),2),2)^Value;
    }
    else if(Factor == 11){
        return _g_mul(_g_mul(_g_mul(Value,2),2)^Value,2)^Value;
    }
    else if(Factor == 13){
        return _g_mul(_g_mul(_g_mul(Value,2)^Value,2),2)^Value;
    }
    else if(Factor == 14){
        return _g_mul(_g_mul(_g_mul(Value,2)^Value,2)^Value,2);
    }
}

const std::vector< std::vector<unsigned> > aes_base::_SBox = {
    {0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76},
    {0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0},
    {0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15},
    {0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75},
    {0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84},
    {0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF},
    {0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8},
    {0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2},
    {0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73},
    {0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB},
    {0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79},
    {0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08},
    {0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A},
    {0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E},
    {0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF},
    {0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16}
};
const std::vector< std::vector<unsigned> > aes_base::_SBoxInv = { 
    {0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB},
    {0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB},
    {0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E},
    {0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25},
    {0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92},
    {0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84},
    {0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06},
    {0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B},
    {0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73},
    {0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E},
    {0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B},
    {0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4},
    {0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F},
    {0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF},
    {0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61},
    {0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D}
};
const unsigned aes_base::_MatDim = 4;
const unsigned aes_base::_ByteSize = 16;
const unsigned aes_base::_RoundNumber = 9;
const unsigned aes_base::_BlockSize = 128;