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keccak.c
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keccak.c
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/* keecak.c */
/*
This file is part of the AVR-Crypto-Lib.
Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
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 <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <avr/pgmspace.h>
#include "memxor.h"
#include "rotate64.h"
#include "keccak.h"
#ifdef DEBUG
# undef DEBUG
#endif
#define DEBUG 0
#if DEBUG
#include "cli.h"
void keccak_dump_state(uint64_t a[5][5]){
uint8_t i,j;
for(i=0; i<5; ++i){
cli_putstr_P(PSTR("\r\n"));
cli_putc('0'+i);
cli_putstr_P(PSTR(": "));
for(j=0; j<5; ++j){
cli_hexdump_rev(&(a[i][j]), 8);
cli_putc(' ');
}
}
}
void keccak_dump_ctx(keccak_ctx_t *ctx){
keccak_dump_state(ctx->a);
cli_putstr_P(PSTR("\r\nDBG: r: "));
cli_hexdump_rev(&(ctx->r), 2);
cli_putstr_P(PSTR("\t c: "));
cli_hexdump_rev(&(ctx->c), 2);
cli_putstr_P(PSTR("\t d: "));
cli_hexdump(&(ctx->d), 1);
cli_putstr_P(PSTR("\t bs: "));
cli_hexdump(&(ctx->bs), 1);
}
#endif
/*
const uint64_t rc[] PROGMEM = {
0x0000000000000001LL, 0x0000000000008082LL,
0x800000000000808ALL, 0x8000000080008000LL,
0x000000000000808BLL, 0x0000000080000001LL,
0x8000000080008081LL, 0x8000000000008009LL,
0x000000000000008ALL, 0x0000000000000088LL,
0x0000000080008009LL, 0x000000008000000ALL,
0x000000008000808BLL, 0x800000000000008BLL,
0x8000000000008089LL, 0x8000000000008003LL,
0x8000000000008002LL, 0x8000000000000080LL,
0x000000000000800ALL, 0x800000008000000ALL,
0x8000000080008081LL, 0x8000000000008080LL,
0x0000000080000001LL, 0x8000000080008008LL
};
*/
const static uint8_t rc_comp[] PROGMEM = {
0x01, 0x92, 0xda, 0x70,
0x9b, 0x21, 0xf1, 0x59,
0x8a, 0x88, 0x39, 0x2a,
0xbb, 0xcb, 0xd9, 0x53,
0x52, 0xc0, 0x1a, 0x6a,
0xf1, 0xd0, 0x21, 0x78,
};
#define RP_IDX(i, j) ((((2 * j + 3 * i) % 5) * 5 + i) * 8)
uint8_t const rho_pi_idx_table[5][5] PROGMEM = {
{ RP_IDX(0, 0), RP_IDX(0, 1), RP_IDX(0, 2), RP_IDX(0, 3), RP_IDX(0, 4) },
{ RP_IDX(1, 0), RP_IDX(1, 1), RP_IDX(1, 2), RP_IDX(1, 3), RP_IDX(1, 4) },
{ RP_IDX(2, 0), RP_IDX(2, 1), RP_IDX(2, 2), RP_IDX(2, 3), RP_IDX(2, 4) },
{ RP_IDX(3, 0), RP_IDX(3, 1), RP_IDX(3, 2), RP_IDX(3, 3), RP_IDX(3, 4) },
{ RP_IDX(4, 0), RP_IDX(4, 1), RP_IDX(4, 2), RP_IDX(4, 3), RP_IDX(4, 4) }
};
#define ROT_BIT(a) (( (a) <= 4) ? ((a) << 1) : (0x01 | ((8 - (a)) << 1)))
#define ROT_CODE(a) ((((a) / 8 + ((((a) % 8) > 4) ? 1 : 0)) << 4) | ROT_BIT(((a) % 8)))
const uint8_t keccak_rotate_codes[5][5] PROGMEM = {
{ ROT_CODE( 0), ROT_CODE( 1), ROT_CODE(62), ROT_CODE(28), ROT_CODE(27) },
{ ROT_CODE(36), ROT_CODE(44), ROT_CODE( 6), ROT_CODE(55), ROT_CODE(20) },
{ ROT_CODE( 3), ROT_CODE(10), ROT_CODE(43), ROT_CODE(25), ROT_CODE(39) },
{ ROT_CODE(41), ROT_CODE(45), ROT_CODE(15), ROT_CODE(21), ROT_CODE( 8) },
{ ROT_CODE(18), ROT_CODE( 2), ROT_CODE(61), ROT_CODE(56), ROT_CODE(14) }
};
static inline
void keccak_round(uint64_t *a, uint8_t rci){
uint64_t b[5][5];
uint8_t i, j;
union {
uint64_t v64;
uint8_t v8[8];
} t;
const uint8_t *rot_code = (const uint8_t*)keccak_rotate_codes;
const uint8_t *idx_idx = (const uint8_t*)rho_pi_idx_table;
uint64_t *a_tmp = (uint64_t*)a;
/* theta */
for(i = 0; i < 5; ++i){
b[i][0] = a[i] ^ a[5 + i] ^ a[10 + i] ^ a[15 + i] ^ a[20 + i];
}
for(i = 0; i < 5; ++i){
t.v64 = b[(4 + i) % 5][0] ^ rotate64_1bit_left(b[(i + 1) % 5][0]);
for(j = 0; j < 5; ++j){
a[j * 5 + i] ^= t.v64;
}
}
#if DEBUG
cli_putstr_P(PSTR("\r\nAfter theta:"));
keccak_dump_state(a);
#endif
/* rho & pi */
for(i = 0; i < 25; ++i){
*((uint64_t*)(((uint8_t*)b) + pgm_read_byte(idx_idx++))) =
rotate64left_code(*a_tmp++, pgm_read_byte(rot_code++));
}
#if DEBUG
cli_putstr_P(PSTR("\r\n--- after rho & pi ---"));
keccak_dump_state(a);
#endif
/* chi */
for(i = 0; i < 5; ++i){
for(j = 0; j < 5; ++j){
a[j * 5 + i] = b[j][i] ^ ((~(b[j][(i + 1) % 5])) & (b[j][(i + 2) % 5]));
}
}
#if DEBUG
cli_putstr_P(PSTR("\r\nAfter chi:"));
keccak_dump_state(a);
#endif
/* iota */
// memcpy_P(&t, &(rc_comp[rci]), 8);
t.v64 = 0;
t.v8[0] = pgm_read_byte(&(rc_comp[rci]));
if(t.v8[0] & 0x40){
t.v8[7] = 0x80;
}
if(t.v8[0] & 0x20){
t.v8[3] = 0x80;
}
if(t.v8[0] & 0x10){
t.v8[1] = 0x80;
}
t.v8[0] &= 0x8F;
a[0] ^= t.v64;
#if DEBUG
cli_putstr_P(PSTR("\r\nAfter iota:"));
keccak_dump_state(a);
#endif
}
void keccak_f1600(void *a){
uint8_t i = 0;
do {
#if DEBUG
cli_putstr_P(PSTR("\r\n\r\n--- Round "));
cli_hexdump(&i, 1);
cli_putstr_P(PSTR(" ---"));
#endif
keccak_round((uint64_t*)a, i);
} while (++i < 24);
}
void keccak_nextBlock(keccak_ctx_t *ctx, const void *block){
memxor(ctx->a, block, ctx->bs);
keccak_f1600(ctx->a);
}
void keccak_lastBlock(keccak_ctx_t *ctx, const void *block, uint16_t length_b){
uint8_t length_B;
uint8_t t;
while(length_b >= ctx->r){
keccak_nextBlock(ctx, block);
block = (uint8_t*)block + ctx->bs;
length_b -= ctx->r;
}
length_B = length_b / 8;
memxor(ctx->a, block, length_B);
/* append 1 */
if(length_b & 7){
/* we have some single bits */
t = ((uint8_t*)block)[length_B] >> (8 - (length_b & 7));
t |= 0x01 << (length_b & 7);;
}else{
t = 0x01;
}
ctx->a[length_B] ^= t;
if(length_b == ctx->r - 1){
keccak_f1600(ctx->a);
}
ctx->a[ctx->bs - 1] ^= 0x80;
keccak_f1600(ctx->a);
}
void keccak_ctx2hash(void *dest, uint16_t length_b, keccak_ctx_t *ctx){
while(length_b >= ctx->r){
memcpy(dest, ctx->a, ctx->bs);
dest = (uint8_t*)dest + ctx->bs;
length_b -= ctx->r;
keccak_f1600(ctx->a);
}
memcpy(dest, ctx->a, (length_b+7)/8);
}
void keccak224_ctx2hash(void *dest, keccak_ctx_t *ctx){
keccak_ctx2hash(dest, 224, ctx);
}
void keccak256_ctx2hash(void *dest, keccak_ctx_t *ctx){
keccak_ctx2hash(dest, 256, ctx);
}
void keccak384_ctx2hash(void *dest, keccak_ctx_t *ctx){
keccak_ctx2hash(dest, 384, ctx);
}
void keccak512_ctx2hash(void *dest, keccak_ctx_t *ctx){
keccak_ctx2hash(dest, 512, ctx);
}
/*
1. SHA3-224: ⌊Keccak[r = 1152, c = 448, d = 28]⌋224
2. SHA3-256: ⌊Keccak[r = 1088, c = 512, d = 32]⌋256
3. SHA3-384: ⌊Keccak[r = 832, c = 768, d = 48]⌋384
4. SHA3-512: ⌊Keccak[r = 576, c = 1024, d = 64]⌋512
*/
void keccak_init(uint16_t r, keccak_ctx_t *ctx){
memset(ctx->a, 0x00, 5 * 5 * 8);
ctx->r = r;
ctx->bs = (uint8_t)(r / 8);
}
void keccak224_init(keccak_ctx_t *ctx){
keccak_init(1152, ctx);
}
void keccak256_init(keccak_ctx_t *ctx){
keccak_init(1088, ctx);
}
void keccak384_init(keccak_ctx_t *ctx){
keccak_init( 832, ctx);
}
void keccak512_init(keccak_ctx_t *ctx){
keccak_init( 576, ctx);
}