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avr-crypto-lib/norx/norx32.c

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/* norx32.c */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <inttypes.h>
#include <avr/pgmspace.h>
#include <stdlib.h>
#include <string.h>
#include <memxor.h>
#include <norx32.h>
#include <stdio.h>
#include "cli.h"
#define R0 8
#define R1 11
#define R2 16
#define R3 31
#define U0 0x243f6a88l
#define U1 0x85a308d3l
#define U2 0x13198a2el
#define U3 0x03707344l
#define U4 0x254f537al
#define U5 0x38531d48l
#define U6 0x839c6E83l
#define U7 0xf97a3ae5l
#define U8 0x8c91d88cl
#define U9 0x11eafb59l
#define WORD_SIZE 32
#define RATE_WORDS 10
#define CAPACITY_WORDS 6
#define RATE_BITS (RATE_WORDS * WORD_SIZE)
#define CAPACITY_BITS (CAPACITY_WORDS * WORD_SIZE)
#define RATE_BYTES (RATE_BITS / 8)
#define CAPACITY_BYTES (CAPACITY_BITS / 8)
#define TAG_HEADER 0x01
#define TAG_PAYLOAD 0x02
#define TAG_TRAILER 0x04
#define TAG_TAG 0x08
#define TAG_BRANCHING 0x10
#define TAG_MERGING 0x20
#define SET_TAG(ctx, t) do { \
((uint8_t*)&(ctx)->s[15])[0] ^= (t); \
} while (0)
#define TOGGLE_BIT(buf, bit_addr) do { \
((uint8_t*)(buf))[(bit_addr) / 8] ^= (1 << ((bit_addr) & 7)); \
} while (0)
#define TRUNCATE_BUFFER(buf, bits) do { \
if (bits & 7) { \
((uint8_t*)(buf))[(bits) / 8] &= 0xff >> (7 - ((bits) & 7)); \
} \
} while (0)
#if 0
void norx32_dump(const norx32_ctx_t *ctx)
{
printf("\n--- DUMP STATE ---");
printf("\n\t%08lX %08lX %08lX %08lX", ctx->s[ 0], ctx->s[ 1], ctx->s[ 2], ctx->s[ 3]);
printf("\n\t%08lX %08lX %08lX %08lX", ctx->s[ 4], ctx->s[ 5], ctx->s[ 6], ctx->s[ 7]);
printf("\n\t%08lX %08lX %08lX %08lX", ctx->s[ 8], ctx->s[ 9], ctx->s[10], ctx->s[11]);
printf("\n\t%08lX %08lX %08lX %08lX", ctx->s[12], ctx->s[13], ctx->s[14], ctx->s[15]);
printf("\n--- END ---\n");
}
#endif
static void phi(uint32_t *a, uint32_t *b)
{
*a = (*a ^ *b) ^ ((*a & *b) << 1);
}
static void xrot(uint32_t *a, uint32_t *b, uint8_t r)
{
uint32_t x;
x = *a ^ *b;
*a = (x << (32 - r)) | (x >> r);
}
#define A (v[3])
#define B (v[2])
#define C (v[1])
#define D (v[0])
static const uint8_t g2_table[8][4] PROGMEM = {
{0, 4, 8, 12},
{1, 5, 9, 13},
{2, 6, 10, 14},
{3, 7, 11, 15},
{0, 5, 10, 15},
{1, 6, 11, 12},
{2, 7, 8, 13},
{3, 4, 9, 14}
};
static void rho(uint32_t *(v[4]), uint8_t ra, uint8_t rb)
{
phi(A, B);
xrot(D, A, ra);
phi(C, D);
xrot(B, C, rb);
}
static void f32(norx32_ctx_t *ctx)
{
uint8_t i, j, rounds;
uint32_t *(v[4]);
const uint8_t *p;
rounds = ctx->r;
do {
p = &g2_table[0][0];
i = 8;
do {
j = 4;
do {
--j;
v[j] = &ctx->s[pgm_read_byte(p++)];
} while(j);
rho(v, R0, R1);
rho(v, R2, R3);
} while (--i);
} while (--rounds);
}
static const uint32_t init_state[] PROGMEM = {
U0, 0, 0, U1,
0, 0, 0, 0,
U2, U3, U4, U5,
U6, U7, U8 ^ (1l << 15), U9
};
static void norx32_process_block(
norx32_ctx_t *ctx,
const void *block,
uint8_t tag )
{
SET_TAG(ctx, tag);
f32(ctx);
memxor(ctx->s, block, RATE_BYTES);
}
static void norx32_process_last_block(
norx32_ctx_t *ctx,
void *out_block,
const void *block,
uint16_t length_b,
uint8_t tag )
{
while (length_b >= RATE_BITS) {
norx32_process_block(ctx, block, tag);
block = (uint8_t*)block + RATE_BYTES;
length_b -= RATE_BITS;
if (out_block) {
memcpy(out_block, ctx->s, RATE_BYTES);
out_block = (uint8_t*)out_block + RATE_BYTES;
}
}
SET_TAG(ctx, tag);
f32(ctx);
memxor(ctx->s, block, (length_b + 7) / 8);
if (out_block) {
memcpy(out_block, ctx->s, (length_b + 7) / 8);
out_block = (uint8_t*)out_block + (length_b + 7) / 8;
#ifndef NO_BIT_MODE
TRUNCATE_BUFFER(out_block, length_b);
#endif
}
#ifndef NO_BIT_MODE
TOGGLE_BIT(ctx->s, length_b);
#else
((uint8_t*)ctx->s)[length_b / 8] ^= 1;
#endif
if (length_b == RATE_BITS - 1) {
SET_TAG(ctx, tag);
f32(ctx);
}
#ifndef NO_BIT_MODE
TOGGLE_BIT(ctx->s, RATE_BITS - 1);
#else
((uint8_t*)ctx->s)[RATE_BYTES - 1] ^= 0x80;
#endif
}
/******************************************************************************/
int8_t norx32_init (
norx32_ctx_t *ctx,
const void* nonce,
const void* key,
uint8_t rounds,
uint8_t parallel,
uint16_t tag_size_b )
{
uint32_t v;
if (ctx == NULL || nonce == NULL || key == NULL) {
return -1;
}
if (tag_size_b > 320) {
return -1;
}
if (rounds < 1 || rounds > 63) {
return -1;
}
if (parallel != 1) {
return -2;
}
memcpy_P(ctx->s, init_state, sizeof(ctx->s));
memcpy(&ctx->s[1], nonce, 2 * sizeof(ctx->s[1]));
memcpy(&ctx->s[4], key, 4 * sizeof(ctx->s[4]));
v = ((uint32_t)rounds) << 26;
v ^= ((uint32_t)parallel) << 18;
v ^= tag_size_b;
ctx->s[14] ^= v;
ctx->d = parallel;
ctx->a = tag_size_b;
ctx->r = rounds;
f32(ctx);
return 0;
}
void norx32_finalize(norx32_ctx_t *ctx, void *tag)
{
SET_TAG(ctx, TAG_TAG);
f32(ctx);
f32(ctx);
if (tag) {
memcpy(tag, ctx->s, (ctx->a + 7) / 8);
#ifndef NO_BIT_MODE
TRUNCATE_BUFFER(tag, ctx->a);
#endif
}
}
void norx32_add_header_block(norx32_ctx_t *ctx, const void *block)
{
norx32_process_block(ctx, block, TAG_HEADER);
}
void norx32_add_header_last_block(
norx32_ctx_t *ctx,
const void *block,
uint16_t length_b )
{
norx32_process_last_block(ctx, NULL, block, length_b, TAG_HEADER);
}
void norx32_encrypt_block(norx32_ctx_t *ctx, void *dest, const void *src)
{
norx32_process_block(ctx, src, TAG_PAYLOAD);
if (dest) {
memcpy(dest, ctx->s, RATE_BYTES);
}
}
void norx32_encrypt_last_block(
norx32_ctx_t *ctx,
void *dest,
const void *src,
uint16_t length_b )
{
norx32_process_last_block(ctx, dest, src, length_b, TAG_PAYLOAD);
}
void norx32_add_trailer_block(norx32_ctx_t *ctx, const void *block)
{
norx32_process_block(ctx, block, TAG_TRAILER);
}
void norx32_add_trailer_last_block(
norx32_ctx_t *ctx,
const void *block,
uint16_t length_b )
{
norx32_process_last_block(ctx, NULL, block, length_b, TAG_TRAILER);
}
/******************************************************************************/
void norx32_default_simple (
void *data_dest,
void *tag_dest,
const void *key,
const void *nonce,
const void *header,
size_t header_length_B,
const void *data_src,
size_t data_length_B,
const void *trailer,
size_t trailer_length_B )
{
norx32_ctx_t ctx;
norx32_init(&ctx, nonce, key, 4, 1, 4 * WORD_SIZE);
if (header && header_length_B) {
norx32_add_header_last_block(&ctx, header, header_length_B * 8);
}
if (data_src && data_length_B) {
norx32_encrypt_last_block(&ctx, data_dest, data_src, data_length_B * 8);
}
if (trailer && trailer_length_B) {
norx32_add_trailer_last_block(&ctx, trailer, trailer_length_B * 8);
}
norx32_finalize(&ctx, tag_dest);
}
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