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#include <stdint.h>
#include <string.h>
#include "parameters.h"
#include "tweakey.h"
#define LANE_BITS 64
#define LANE_BYTES (LANE_BITS/8)
#define LANES_NB (TWEAKEY_BYTES/LANE_BYTES)
void tweakey_state_init(
uint8_t TK[TWEAKEY_BYTES],
const uint8_t key[KEY_BYTES],
const uint8_t tweak[TWEAK_BYTES]
)
{
memcpy(TK, tweak, TWEAK_BYTES);
memcpy(TK+TWEAK_BYTES, key, KEY_BYTES);
}
void tweakey_state_extract(
const uint8_t TK[TWEAKEY_BYTES],
uint8_t round_constant,
uint8_t round_tweakey[ROUND_TWEAKEY_BYTES]
)
{
memset(round_tweakey, 0, ROUND_TWEAKEY_BYTES);
for (size_t j=0; j<LANES_NB; j++)
{
const uint8_t *TKj = TK + j*LANE_BYTES;
for (size_t k=0; k<LANE_BYTES; k++)
{
round_tweakey[k] ^= TKj[k];
}
}
round_tweakey[0] ^= round_constant;
}
static void _multiply_M(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
Y[7] = X[6];
Y[6] = X[5];
Y[5] = X[4] ^ X[5]<<3;
Y[4] = X[3] ^ X[4]>>3;
Y[3] = X[2];
Y[2] = X[1] ^ X[6]<<2;
Y[1] = X[0];
Y[0] = X[7];
}
static const uint8_t M_1[256] = {
0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
0x41, 0x49, 0x51, 0x59, 0x61, 0x69, 0x71, 0x79,
0x82, 0x8a, 0x92, 0x9a, 0xa2, 0xaa, 0xb2, 0xba,
0xc3, 0xcb, 0xd3, 0xdb, 0xe3, 0xeb, 0xf3, 0xfb,
0x04, 0x0c, 0x14, 0x1c, 0x24, 0x2c, 0x34, 0x3c,
0x45, 0x4d, 0x55, 0x5d, 0x65, 0x6d, 0x75, 0x7d,
0x86, 0x8e, 0x96, 0x9e, 0xa6, 0xae, 0xb6, 0xbe,
0xc7, 0xcf, 0xd7, 0xdf, 0xe7, 0xef, 0xf7, 0xff,
0x08, 0x00, 0x18, 0x10, 0x28, 0x20, 0x38, 0x30,
0x49, 0x41, 0x59, 0x51, 0x69, 0x61, 0x79, 0x71,
0x8a, 0x82, 0x9a, 0x92, 0xaa, 0xa2, 0xba, 0xb2,
0xcb, 0xc3, 0xdb, 0xd3, 0xeb, 0xe3, 0xfb, 0xf3,
0x0c, 0x04, 0x1c, 0x14, 0x2c, 0x24, 0x3c, 0x34,
0x4d, 0x45, 0x5d, 0x55, 0x6d, 0x65, 0x7d, 0x75,
0x8e, 0x86, 0x9e, 0x96, 0xae, 0xa6, 0xbe, 0xb6,
0xcf, 0xc7, 0xdf, 0xd7, 0xef, 0xe7, 0xff, 0xf7,
0x10, 0x18, 0x00, 0x08, 0x30, 0x38, 0x20, 0x28,
0x51, 0x59, 0x41, 0x49, 0x71, 0x79, 0x61, 0x69,
0x92, 0x9a, 0x82, 0x8a, 0xb2, 0xba, 0xa2, 0xaa,
0xd3, 0xdb, 0xc3, 0xcb, 0xf3, 0xfb, 0xe3, 0xeb,
0x14, 0x1c, 0x04, 0x0c, 0x34, 0x3c, 0x24, 0x2c,
0x55, 0x5d, 0x45, 0x4d, 0x75, 0x7d, 0x65, 0x6d,
0x96, 0x9e, 0x86, 0x8e, 0xb6, 0xbe, 0xa6, 0xae,
0xd7, 0xdf, 0xc7, 0xcf, 0xf7, 0xff, 0xe7, 0xef,
0x18, 0x10, 0x08, 0x00, 0x38, 0x30, 0x28, 0x20,
0x59, 0x51, 0x49, 0x41, 0x79, 0x71, 0x69, 0x61,
0x9a, 0x92, 0x8a, 0x82, 0xba, 0xb2, 0xaa, 0xa2,
0xdb, 0xd3, 0xcb, 0xc3, 0xfb, 0xf3, 0xeb, 0xe3,
0x1c, 0x14, 0x0c, 0x04, 0x3c, 0x34, 0x2c, 0x24,
0x5d, 0x55, 0x4d, 0x45, 0x7d, 0x75, 0x6d, 0x65,
0x9e, 0x96, 0x8e, 0x86, 0xbe, 0xb6, 0xae, 0xa6,
0xdf, 0xd7, 0xcf, 0xc7, 0xff, 0xf7, 0xef, 0xe7
};
static const uint8_t M_2[256] = {
0x00, 0x40, 0x80, 0xc0, 0x00, 0x40, 0x80, 0xc0,
0x08, 0x48, 0x88, 0xc8, 0x08, 0x48, 0x88, 0xc8,
0x10, 0x50, 0x90, 0xd0, 0x10, 0x50, 0x90, 0xd0,
0x18, 0x58, 0x98, 0xd8, 0x18, 0x58, 0x98, 0xd8,
0x20, 0x60, 0xa0, 0xe0, 0x20, 0x60, 0xa0, 0xe0,
0x28, 0x68, 0xa8, 0xe8, 0x28, 0x68, 0xa8, 0xe8,
0x30, 0x70, 0xb0, 0xf0, 0x30, 0x70, 0xb0, 0xf0,
0x38, 0x78, 0xb8, 0xf8, 0x38, 0x78, 0xb8, 0xf8,
0x41, 0x01, 0xc1, 0x81, 0x41, 0x01, 0xc1, 0x81,
0x49, 0x09, 0xc9, 0x89, 0x49, 0x09, 0xc9, 0x89,
0x51, 0x11, 0xd1, 0x91, 0x51, 0x11, 0xd1, 0x91,
0x59, 0x19, 0xd9, 0x99, 0x59, 0x19, 0xd9, 0x99,
0x61, 0x21, 0xe1, 0xa1, 0x61, 0x21, 0xe1, 0xa1,
0x69, 0x29, 0xe9, 0xa9, 0x69, 0x29, 0xe9, 0xa9,
0x71, 0x31, 0xf1, 0xb1, 0x71, 0x31, 0xf1, 0xb1,
0x79, 0x39, 0xf9, 0xb9, 0x79, 0x39, 0xf9, 0xb9,
0x82, 0xc2, 0x02, 0x42, 0x82, 0xc2, 0x02, 0x42,
0x8a, 0xca, 0x0a, 0x4a, 0x8a, 0xca, 0x0a, 0x4a,
0x92, 0xd2, 0x12, 0x52, 0x92, 0xd2, 0x12, 0x52,
0x9a, 0xda, 0x1a, 0x5a, 0x9a, 0xda, 0x1a, 0x5a,
0xa2, 0xe2, 0x22, 0x62, 0xa2, 0xe2, 0x22, 0x62,
0xaa, 0xea, 0x2a, 0x6a, 0xaa, 0xea, 0x2a, 0x6a,
0xb2, 0xf2, 0x32, 0x72, 0xb2, 0xf2, 0x32, 0x72,
0xba, 0xfa, 0x3a, 0x7a, 0xba, 0xfa, 0x3a, 0x7a,
0xc3, 0x83, 0x43, 0x03, 0xc3, 0x83, 0x43, 0x03,
0xcb, 0x8b, 0x4b, 0x0b, 0xcb, 0x8b, 0x4b, 0x0b,
0xd3, 0x93, 0x53, 0x13, 0xd3, 0x93, 0x53, 0x13,
0xdb, 0x9b, 0x5b, 0x1b, 0xdb, 0x9b, 0x5b, 0x1b,
0xe3, 0xa3, 0x63, 0x23, 0xe3, 0xa3, 0x63, 0x23,
0xeb, 0xab, 0x6b, 0x2b, 0xeb, 0xab, 0x6b, 0x2b,
0xf3, 0xb3, 0x73, 0x33, 0xf3, 0xb3, 0x73, 0x33,
0xfb, 0xbb, 0x7b, 0x3b, 0xfb, 0xbb, 0x7b, 0x3b,
};
static void _multiply_M2(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
Y[7] = X[5];
Y[6] = X[4] ^ X[5]<<3;
Y[5] = X[3] ^ M_1[X[4]] ^ X[5]<<6;
Y[4] = X[2] ^ X[3]>>3 ^ X[4]>>6;
Y[3] = X[6]<<2 ^ X[1];
Y[2] = X[5]<<2 ^ X[0];
Y[1] = X[7];
Y[0] = X[6];
}
static void _multiply_M3(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
Y[7] = X[5]<<3 ^ X[4];
Y[6] = X[5]<<6 ^ M_1[X[4]] ^ X[3];
Y[5] = M_2[X[4]] ^ M_1[X[3]] ^ X[2];
Y[4] = X[6]<<2 ^ X[3]>>6 ^ X[2]>>3 ^ X[1];
Y[3] = X[5]<<2 ^ X[0];
Y[2] = X[7] ^ X[5]<<5 ^ X[4]<<2;
Y[1] = X[6];
Y[0] = X[5];
}
static void _multiply_MR(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
Y[0] = X[1];
Y[1] = X[2];
Y[2] = X[3] ^ X[4]>>3;
Y[3] = X[4];
Y[4] = X[5] ^ X[6]<<3;
Y[5] = X[6] ^ X[3]<<2;
Y[6] = X[7];
Y[7] = X[0];
}
static void _multiply_MR2(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
uint8_t tmp[LANE_BYTES];
memcpy(tmp, X, LANE_BYTES);
_multiply_MR(X, tmp);
_multiply_MR(tmp, Y);
}
static void _multiply_MR3(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
{
uint8_t tmp[LANE_BYTES];
memcpy(tmp, X, LANE_BYTES);
_multiply_MR2(X, tmp);
_multiply_MR(tmp, Y);
}
typedef void (*matrix_multiplication)(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES]);
static const matrix_multiplication ALPHAS[6] = {
_multiply_M,
_multiply_M2,
_multiply_M3,
_multiply_MR,
_multiply_MR2,
_multiply_MR3
};
void tweakey_state_update(uint8_t TK[TWEAKEY_BYTES])
{
/* Skip lane 0, as it is multiplied by the identity matrix. */
for (size_t j=1; j<LANES_NB; j++)
{
uint8_t *TKj = TK + j*LANE_BYTES;
uint8_t TKj_old[LANE_BYTES];
memcpy(TKj_old, TKj, LANE_BYTES);
ALPHAS[j-1](TKj_old, TKj);
}
}
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