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Kuznyechik.cpp
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// WARNING!!!
// None of the funcions defined above MUST NOT be used in any
// context except the one which has been declared in the
// appropriate header file "Kuznyechik.hpp"
#include <stdexcept>
#include <vector>
using std::vector;
#include <map>
using std::map;
#include <iostream>
#include <cstring>
using std::cerr;
using std::endl;
#include "Kuznyechik.hpp"
#include "mycrypto.hpp"
bool Kuznyechik::is_init = false;
const vector<BYTE> nonlinear_transform_perm = {
252, 238, 221, 17, 207, 110, 49, 22, 251, 196,
250, 218, 35, 197, 4, 77, 233, 119, 240, 219,
147, 46, 153, 186, 23, 54, 241, 187, 20, 205,
95, 193, 249, 24, 101, 90, 226, 92, 239, 33,
129, 28, 60, 66, 139, 1, 142, 79, 5, 132, 2,
174, 227, 106, 143, 160, 6, 11, 237, 152, 127,
212, 211, 31, 235, 52, 44, 81, 234, 200, 72,
171, 242, 42, 104, 162, 253, 58, 206, 204, 181,
112, 14, 86, 8, 12, 118, 18, 191, 114, 19, 71,
156, 183, 93, 135, 21, 161, 150, 41, 16, 123,
154, 199, 243, 145, 120, 111, 157, 158, 178, 177,
50, 117, 25, 61, 255, 53, 138, 126, 109, 84,
198, 128, 195, 189, 13, 87, 223, 245, 36, 169,
62, 168, 67, 201, 215, 121, 214, 246, 124, 34,
185, 3, 224, 15, 236, 222, 122, 148, 176, 188,
220, 232, 40, 80, 78, 51, 10, 74, 167, 151, 96,
115, 30, 0, 98, 68, 26, 184, 56, 130, 100, 159,
38, 65, 173, 69, 70, 146, 39, 94, 85, 47, 140,
163, 165, 125, 105, 213, 149, 59, 7, 88, 179,
64, 134, 172, 29, 247, 48, 55, 107, 228, 136,
217, 231, 137, 225, 27, 131, 73, 76, 63, 248,
254, 141, 83, 170, 144, 202, 216, 133, 97, 32,
113, 103, 164, 45, 43, 9, 91, 203, 155, 37,
208, 190, 229, 108, 82, 89, 166, 116, 210, 230,
244, 180, 192, 209, 102, 175, 194, 57, 75, 99,
182
};
const map<BYTE, BYTE> direct_permutation, inverse_permutation;
const vector<WORD> linear_transform_coeff = {
148, 32, 133, 16, 194, 192, 1, 251, 1, 192,
194, 16, 133, 32, 148, 1
};
const WORD linear_transform_modulus = 0x1C3;
const vector<ByteBlock> iteration_constants;
void init_perms();
void init_consts();
void nonlinear_transform_direct128(BYTE * target);
void nonlinear_transform_inverse128(BYTE * target);
WORD multiply(WORD lhs, WORD rhs);
void xor128(BYTE * dst, const BYTE * lhs, const BYTE * rhs);
BYTE linear_transform_core128(const BYTE * target);
void linear_transform_direct128(BYTE * target);
void linear_transform_inverse128(BYTE * target);
void iteration_linear_transform_direct128(BYTE * target);
void iteration_linear_transform_inverse128(BYTE * target);
void encrypt128(BYTE * target, const vector<ByteBlock> & keys);
void decrypt128(BYTE * target, const vector<ByteBlock> & keys);
void keys_transform128(BYTE * k1, BYTE * k2, int iconst);
void key_derivation128(BYTE * k1, BYTE * k2, BYTE * k3, BYTE * k4, int ipair);
Kuznyechik::Kuznyechik(const ByteBlock & key) :
keys(10)
{
if(key.size() != 32)
throw std::invalid_argument("Kuznyechik: The key must be 32 bytes long");
if(!is_init) {
init_perms();
init_consts();
is_init = true;
}
keys[0].reset(key.byte_ptr(), BLOCK_LENGTH);
keys[1].reset(key.byte_ptr() + BLOCK_LENGTH, BLOCK_LENGTH);
for(int i = 0; i < 4; i++) {
keys[2 * i + 2] = ByteBlock(BLOCK_LENGTH);
keys[2 * i + 3] = ByteBlock(BLOCK_LENGTH);
key_derivation128(
keys[2 * i].byte_ptr(),
keys[2 * i + 1].byte_ptr(),
keys[2 * i + 2].byte_ptr(),
keys[2 * i + 3].byte_ptr(),
i
);
}
}
Kuznyechik::Kuznyechik(const Kuznyechik & rhs) {
is_init = rhs.is_init;
for(auto & iter_key : rhs.keys)
keys.push_back(iter_key.deep_copy());
}
Kuznyechik::~Kuznyechik() {}
void Kuznyechik::encrypt(const ByteBlock & src, ByteBlock & dst) const {
if(src.size() != BLOCK_LENGTH)
throw std::invalid_argument("Kuznyechik: The block must be 16 bytes length");
if(dst != src) dst = src.deep_copy();
encrypt128(dst.byte_ptr(), keys);
}
void Kuznyechik::decrypt(const ByteBlock & src, ByteBlock & dst) const {
if(src.size() != BLOCK_LENGTH)
throw std::invalid_argument("Kuznyechik: The block must be 16 bytes length");
if(dst != src) dst = src.deep_copy();
decrypt128(dst.byte_ptr(), keys);
}
void init_perms() {
map<BYTE, BYTE> *p_direct, *p_inverse;
p_direct = const_cast< map<BYTE, BYTE> * >(&direct_permutation);
p_inverse = const_cast< map<BYTE, BYTE> * >(&inverse_permutation);
for(int i = 0; i < nonlinear_transform_perm.size(); i++) {
(*p_direct)[i] = nonlinear_transform_perm[i];
(*p_inverse)[nonlinear_transform_perm[i]] = i;
}
}
void init_consts() {
vector<ByteBlock> * p = const_cast< vector<ByteBlock> * >(&iteration_constants);
ByteBlock v128;
for(BYTE i = 1; i <= 32; i++) {
v128 = ByteBlock(BLOCK_LENGTH, 0);
v128[BLOCK_LENGTH - 1] = i;
iteration_linear_transform_direct128(v128.byte_ptr());
p->push_back(std::move(v128));
}
}
void xor128(BYTE * dst, const BYTE * lhs, const BYTE * rhs) {
const BYTE * p_end = dst + BLOCK_LENGTH;
while(dst != p_end) {
*(dst++) = *(lhs++) ^ *(rhs++);
}
}
WORD multiply(WORD lhs, WORD rhs) {
WORD result = 0, modulus = linear_transform_modulus << 7;
for(WORD detecter = 0x1; detecter != 0x100; detecter <<= 1, lhs <<= 1)
if(rhs & detecter) result ^= lhs;
for(WORD detecter = 0x8000; detecter != 0x80; detecter >>= 1, modulus >>= 1)
if(result & detecter) result ^= modulus;
return result;
}
void nonlinear_transform_direct128(BYTE * target) {
BYTE * p_end = target + BLOCK_LENGTH;
while(target != p_end) {
*target = direct_permutation.at(*target);
target++;
}
}
void nonlinear_transform_inverse128(BYTE * target) {
BYTE * p_end = target + BLOCK_LENGTH;
while(target != p_end) {
*target = inverse_permutation.at(*target);
target++;
}
}
BYTE linear_transform_core128(const BYTE * target) {
WORD result = 0;
for(int i = 0; i < BLOCK_LENGTH; i++) {
result ^= multiply(target[i], linear_transform_coeff[i]);
}
return result;
}
void linear_transform_direct128(BYTE * target) {
BYTE buffer = linear_transform_core128(target);
for(int i = BLOCK_LENGTH - 1; i > 0; i--)
target[i] = target[i-1];
*target = buffer;
}
void linear_transform_inverse128(BYTE * target) {
BYTE buffer = *target;
for(int i = 0; i < BLOCK_LENGTH - 1; i++)
target[i] = target[i+1];
target[15] = buffer;
target[15] = linear_transform_core128(target);
}
void iteration_linear_transform_direct128(BYTE * target) {
for(int i = 0; i < BLOCK_LENGTH; i++)
linear_transform_direct128(target);
}
void iteration_linear_transform_inverse128(BYTE * target) {
for(int i = 0; i < BLOCK_LENGTH; i++)
linear_transform_inverse128(target);
}
void encrypt128(BYTE * target, const vector<ByteBlock> & keys) {
xor128(target, target, keys[0].byte_ptr());
for(int i = 1; i < 10; i++) {
nonlinear_transform_direct128(target);
iteration_linear_transform_direct128(target);
xor128(target, target, keys[i].byte_ptr());
}
}
void decrypt128(BYTE * target, const vector<ByteBlock> & keys) {
xor128(target, target, keys[9].byte_ptr());
for(int i = 8; i >= 0; i--) {
iteration_linear_transform_inverse128(target);
nonlinear_transform_inverse128(target);
xor128(target, target, keys[i].byte_ptr());
}
}
void keys_transform128(BYTE * k1, BYTE * k2, int iconst) {
BYTE buffer[BLOCK_LENGTH];
memcpy(buffer, k1, BLOCK_LENGTH);
xor128(k1, k1, iteration_constants[iconst].byte_ptr());
nonlinear_transform_direct128(k1);
iteration_linear_transform_direct128(k1);
xor128(k1, k2, k1);
memcpy(k2, buffer, BLOCK_LENGTH);
}
void key_derivation128(BYTE * k1, BYTE * k2, BYTE * k3, BYTE * k4, int ipair) {
if(k1 != k3) memcpy(k3, k1, BLOCK_LENGTH);
if(k2 != k4) memcpy(k4, k2, BLOCK_LENGTH);
for(int i = 0; i < 8; i++) {
keys_transform128(k3, k4, ipair * 8 + i);
}
}