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nxt64.c
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nxt64.c
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/*
* IDEA NXT encryption algorithm implementation
* Issue date: 02/25/2006
*
* Copyright (C) 2006 Olivier Gay <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <assert.h>
#include "nxt_common.h"
#include "nxt64.h"
#include "nxt64_tables.h"
#ifndef USE_NXT64
#error Set USE_NXT64 in nxt_common.h to use NXT64
#endif
#if ((NXT64_TOTAL_ROUNDS <= 1) || (NXT64_TOTAL_ROUNDS > 255))
#error NXT64_TOTAL_ROUNDS must be greater than 1 and smaller than 256
#elif ((defined NXT64_UNROLL_LOOPS) && (NXT64_TOTAL_ROUNDS != 16) \
&& (NXT64_TOTAL_ROUNDS != 12))
#error NXT64_TOTAL_ROUNDS must be 12 or 16 when NXT64_UNROLL_LOOPS is set
#endif
#define SIGMA_MU4(x) \
tbsm0_64[(x & 0xff000000) >> 24] \
^ tbsm1_64[(x & 0x00ff0000) >> 16] \
^ tbsm2_64[(x & 0x0000ff00) >> 8] \
^ tbsm3_64[(x & 0x000000ff) ]
#define SIGMA(x) \
tbs0_64[(x & 0xff000000) >> 24] \
^ tbs1_64[(x & 0x00ff0000) >> 16] \
^ tbs2_64[(x & 0x0000ff00) >> 8] \
^ tbs3_64[(x & 0x000000ff) ]
#define F32(i) \
{ \
f = x0 ^ x1 ^ rk[0]; \
f = rk[1] ^ SIGMA_MU4(f); \
f = rk[0] ^ SIGMA(f); \
}
#define LMOR64(i) \
{ \
F32(i); \
x0 ^= f; \
x0 = NXT_OR(x0); \
x1 ^= f; \
rk += 2; \
}
#define LMIO64(i) \
{ \
F32(i); \
x0 ^= f; \
x0 = NXT_IO(x0); \
x1 ^= f; \
rk -= 2; \
}
#define LMID64(i) \
{ \
F32(i); \
x0 ^= f; \
x1 ^= f; \
}
#ifdef NXT64_INIT_TABLES
void nxt64_init_tables(void)
{
int i;
uint8 s;
for (i = 0; i < 256; i++) {
s = sbox[i];
tbsm0_64[i] = ((uint32) s << 24)
^ ((uint32) s << 16)
^ ((uint32) (nxt_alpha_div(s) ^ s) << 8)
^ ((uint32) nxt_alpha_mul(s));
tbsm1_64[i] = ((uint32) s << 24)
^ ((uint32) (nxt_alpha_div(s) ^ s) << 16)
^ ((uint32) nxt_alpha_mul(s) << 8)
^ ((uint32) s);
tbsm2_64[i] = ((uint32) s << 24)
^ ((uint32) nxt_alpha_mul(s) << 16)
^ ((uint32) s << 8)
^ ((uint32) (nxt_alpha_div(s) ^ s));
tbsm3_64[i] = ((uint32) nxt_alpha_mul(s) << 24)
^ ((uint32) s << 16)
^ ((uint32) s << 8)
^ ((uint32) s);
tbs0_64[i] = (uint32) s << 24;
tbs1_64[i] = (uint32) s << 16;
tbs2_64[i] = (uint16) s << 8;
tbs3_64[i] = s ;
}
}
#endif /* NXT64_INIT_TABLES */
void nxt64_encrypt(nxt64_ctx *ctx, const uint8 *in, uint8 *out)
{
uint32 x0, x1;
uint32 f;
uint32 *rk;
#ifndef NXT64_UNROLL_LOOPS
int i;
#endif
PACK32(in , &x0);
PACK32(in + 4, &x1);
rk = ctx->rk;
#ifdef NXT64_UNROLL_LOOPS
#if NXT64_TOTAL_ROUNDS == 16
LMOR64( 0); LMOR64( 2); LMOR64( 4); LMOR64( 6); LMOR64( 8); LMOR64(10);
LMOR64(12); LMOR64(14); LMOR64(16); LMOR64(18); LMOR64(20); LMOR64(22);
LMOR64(24); LMOR64(26); LMOR64(28);
LMID64(30);
#endif
#if NXT64_TOTAL_ROUNDS == 12
LMOR64( 0); LMOR64( 2); LMOR64( 4); LMOR64( 6); LMOR64( 8); LMOR64(10);
LMOR64(12); LMOR64(14); LMOR64(16); LMOR64(18); LMOR64(20);
LMID64(22);
#endif
#else /* !NXT64_UNROLL_LOOPS */
for (i = 0; i < (NXT64_TOTAL_ROUNDS - 1); i++) {
LMOR64(0);
}
LMID64(0);
#endif /* !NXT64_UNROLL_LOOPS */
UNPACK32(x0, out );
UNPACK32(x1, out + 4);
}
void nxt64_decrypt(nxt64_ctx *ctx, const uint8 *in, uint8 *out)
{
uint32 x0, x1;
uint32 f;
uint32 *rk;
#ifndef NXT64_UNROLL_LOOPS
int i;
#endif
PACK32(in , &x0);
PACK32(in + 4, &x1);
rk = ctx->rk + 2 * (NXT64_TOTAL_ROUNDS - 1);
#ifdef NXT64_UNROLL_LOOPS
#if NXT64_TOTAL_ROUNDS == 16
LMIO64(30); LMIO64(28); LMIO64(26); LMIO64(24); LMIO64(22); LMIO64(20);
LMIO64(18); LMIO64(16); LMIO64(14); LMIO64(12); LMIO64(10); LMIO64( 8);
LMIO64( 6); LMIO64( 4); LMIO64( 2);
LMID64(0);
#endif
#if NXT64_TOTAL_ROUNDS == 12
LMIO64(22); LMIO64(20); LMIO64(18); LMIO64(16); LMIO64(14); LMIO64(12);
LMIO64(10); LMIO64( 8); LMIO64( 6); LMIO64( 4); LMIO64( 2);
LMID64(0);
#endif
#else /* !NXT64_UNROLL_LOOPS */
for (i = 0; i < (NXT64_TOTAL_ROUNDS - 1); i++) {
LMIO64(0);
}
LMID64(0);
#endif /* !NXT64_UNROLL_LOOPS */
UNPACK32(x0, out );
UNPACK32(x1, out + 4);
}
#define MIX64(x, y) \
{ \
*(y ) = *(x + 1) ^ *(x + 2) ^ *(x + 3); \
*(y + 1) = *(x ) ^ *(x + 2) ^ *(x + 3); \
*(y + 2) = *(x ) ^ *(x + 1) ^ *(x + 3); \
*(y + 3) = *(x ) ^ *(x + 1) ^ *(x + 2); \
}
#define MIX64H(x, y) \
{ \
*(y ) = *(x + 2) ^ *(x + 4) ^ *(x + 6); \
*(y + 1) = *(x + 3) ^ *(x + 5) ^ *(x + 7); \
*(y + 2) = *(x ) ^ *(x + 4) ^ *(x + 6); \
*(y + 3) = *(x + 1) ^ *(x + 5) ^ *(x + 7); \
*(y + 4) = *(x ) ^ *(x + 2) ^ *(x + 6); \
*(y + 5) = *(x + 1) ^ *(x + 3) ^ *(x + 7); \
*(y + 6) = *(x ) ^ *(x + 2) ^ *(x + 4); \
*(y + 7) = *(x + 1) ^ *(x + 3) ^ *(x + 5); \
}
static void nxt64_dnl64(const uint8 *mkey, uint32 *reg,
uint32 *rkey, uint8 eq)
{
uint32 t0[4];
uint32 t1[4];
uint32 dkey32[4];
uint32 x0, x1;
uint32 f;
uint32 *rk;
uint32 lfsr_value;
int i;
uint8 dkey[16];
/* D-part */
for (i = 0; i < 5; i++) {
LFSR(reg, lfsr_value);
dkey[0 + i * 3] = mkey[0 + i * 3] ^ ((uint8) (lfsr_value >> 16));
dkey[1 + i * 3] = mkey[1 + i * 3] ^ ((uint8) (lfsr_value >> 8));
dkey[2 + i * 3] = mkey[2 + i * 3] ^ ((uint8) (lfsr_value));
}
LFSR(reg, lfsr_value);
dkey[15] = mkey[15] ^ ((uint8) (lfsr_value >> 16));
/* NL64-part */
rk = dkey32;
PACK32(dkey , dkey32 );
PACK32(dkey + 4, dkey32 + 1);
PACK32(dkey + 8, dkey32 + 2);
PACK32(dkey + 12, dkey32 + 3);
t0[0] = SIGMA_MU4(dkey32[0]);
t0[1] = SIGMA_MU4(dkey32[1]);
t0[2] = SIGMA_MU4(dkey32[2]);
t0[3] = SIGMA_MU4(dkey32[3]);
MIX64(t0, t1);
PACK32(pad , t0 );
PACK32(pad + 4, t0 + 1);
PACK32(pad + 8, t0 + 2);
PACK32(pad + 12, t0 + 3);
t1[0] ^= t0[0];
t1[1] ^= t0[1];
t1[2] ^= t0[2];
t1[3] ^= t0[3];
if (eq) {
t1[0] = ~t1[0];
t1[1] = ~t1[1];
t1[2] = ~t1[2];
t1[3] = ~t1[3];
}
x0 = SIGMA(t1[0]) ^ SIGMA(t1[2]);
x1 = SIGMA(t1[1]) ^ SIGMA(t1[3]);
LMOR64(0);
LMID64(0);
rkey[0] = x0;
rkey[1] = x1;
}
static void nxt64_dnl64h(const uint8 *mkey, uint32 *reg,
uint32 *rkey, uint8 eq)
{
uint32 t0[8];
uint32 t1[8];
uint32 dkey32[8];
uint32 x0, x1;
uint32 f;
uint32 *rk;
uint32 lfsr_value;
int i;
uint8 dkey[32];
/* D-part */
for (i = 0; i < 10; i++) {
LFSR(reg, lfsr_value);
dkey[0 + i * 3] = mkey[0 + i * 3] ^ ((uint8) (lfsr_value >> 16));
dkey[1 + i * 3] = mkey[1 + i * 3] ^ ((uint8) (lfsr_value >> 8));
dkey[2 + i * 3] = mkey[2 + i * 3] ^ ((uint8) (lfsr_value));
}
LFSR(reg, lfsr_value);
dkey[30] = mkey[30] ^ ((uint8) (lfsr_value >> 16));
dkey[31] = mkey[31] ^ ((uint8) (lfsr_value >> 8));
/* NL64h-part */
rk = dkey32;
PACK32(dkey , dkey32 );
PACK32(dkey + 4, dkey32 + 1);
PACK32(dkey + 8, dkey32 + 2);
PACK32(dkey + 12, dkey32 + 3);
PACK32(dkey + 16, dkey32 + 4);
PACK32(dkey + 20, dkey32 + 5);
PACK32(dkey + 24, dkey32 + 6);
PACK32(dkey + 28, dkey32 + 7);
t0[0] = SIGMA_MU4(dkey32[0]);
t0[1] = SIGMA_MU4(dkey32[1]);
t0[2] = SIGMA_MU4(dkey32[2]);
t0[3] = SIGMA_MU4(dkey32[3]);
t0[4] = SIGMA_MU4(dkey32[4]);
t0[5] = SIGMA_MU4(dkey32[5]);
t0[6] = SIGMA_MU4(dkey32[6]);
t0[7] = SIGMA_MU4(dkey32[7]);
MIX64H(t0, t1);
PACK32(pad , t0 );
PACK32(pad + 4, t0 + 1);
PACK32(pad + 8, t0 + 2);
PACK32(pad + 12, t0 + 3);
PACK32(pad + 16, t0 + 4);
PACK32(pad + 20, t0 + 5);
PACK32(pad + 24, t0 + 6);
PACK32(pad + 28, t0 + 7);
t1[0] ^= t0[0];
t1[1] ^= t0[1];
t1[2] ^= t0[2];
t1[3] ^= t0[3];
t1[4] ^= t0[4];
t1[5] ^= t0[5];
t1[6] ^= t0[6];
t1[7] ^= t0[7];
if (eq) {
t1[0] = ~t1[0];
t1[1] = ~t1[1];
t1[2] = ~t1[2];
t1[3] = ~t1[3];
t1[4] = ~t1[4];
t1[5] = ~t1[5];
t1[6] = ~t1[6];
t1[7] = ~t1[7];
}
x0 = SIGMA(t1[0]) ^ SIGMA(t1[1]) ^ SIGMA(t1[4]) ^ SIGMA(t1[5]);
x1 = SIGMA(t1[2]) ^ SIGMA(t1[3]) ^ SIGMA(t1[6]) ^ SIGMA(t1[7]);
LMOR64(0);
LMOR64(0);
LMOR64(0);
LMID64(0);
rkey[0] = x0;
rkey[1] = x1;
}
static void nxt64_ks64(nxt64_ctx *ctx, const uint8 *key, uint16 key_len)
{
const uint16 ek = 128;
uint8 pk[32];
uint8 mk[32];
uint32 reg;
int i;
uint8 eq;
/* Pre-clock LFSR */
reg = 0x006a0000 | ((NXT64_TOTAL_ROUNDS << 8) & 0x0000ff00)
| ((~NXT64_TOTAL_ROUNDS) & 0x000000ff);
if (reg & 0x00000001)
reg ^= 0x100001b;
reg >>= 1;
eq = (key_len == ek);
if (key_len < ek) {
nxt_p(key, (key_len >> 3), pk, ek);
nxt_m(pk, mk, ek);
for (i = 0; i < NXT64_TOTAL_ROUNDS; i++) {
nxt64_dnl64(mk, ®, &ctx->rk[i * 2], eq);
}
} else {
for (i = 0; i < NXT64_TOTAL_ROUNDS; i++) {
nxt64_dnl64(key, ®, &ctx->rk[i * 2], eq);
}
}
}
static void nxt64_ks64h(nxt64_ctx *ctx, const uint8 *key, uint16 key_len)
{
const uint16 ek = 256;
uint8 pk[32];
uint8 mk[32];
uint32 reg;
int i;
uint8 eq;
/* Pre-clock LFSR */
reg = 0x006a0000 | ((NXT64_TOTAL_ROUNDS << 8) & 0x0000ff00)
| ((~NXT64_TOTAL_ROUNDS) & 0x000000ff);
if (reg & 0x1)
reg ^= 0x100001b;
reg >>= 1;
eq = (key_len == ek);
if (key_len < ek) {
nxt_p(key, (key_len >> 3), pk, ek);
nxt_m(pk, mk, ek);
for (i = 0; i < NXT64_TOTAL_ROUNDS; i++) {
nxt64_dnl64h(mk, ®, &ctx->rk[i * 2], eq);
}
} else {
for (i = 0; i < NXT64_TOTAL_ROUNDS; i++) {
nxt64_dnl64h(key, ®, &ctx->rk[i * 2], eq);
}
}
}
void nxt64_ks(nxt64_ctx *ctx, const uint8 *key, uint16 key_len)
{
assert((key_len % 8 == 0) && (key_len <= 256));
if (key_len <= 128)
nxt64_ks64(ctx, key, key_len);
else
nxt64_ks64h(ctx, key, key_len);
}