2010-02-10 22:27:02 +00:00
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/* keecak.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <avr/pgmspace.h>
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#include "memxor.h"
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#include "keccak.h"
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#ifdef DEBUG
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# undef DEBUG
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#endif
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2010-02-11 13:44:50 +00:00
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#define DEBUG 0
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2010-02-10 22:27:02 +00:00
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#if DEBUG
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#include "cli.h"
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void keccak_dump_state(uint64_t a[5][5]){
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uint8_t i,j;
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for(i=0; i<5; ++i){
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cli_putstr_P(PSTR("\r\n"));
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cli_putc('0'+i);
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cli_putstr_P(PSTR(": "));
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for(j=0; j<5; ++j){
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cli_hexdump_rev(&(a[i][j]), 8);
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cli_putc(' ');
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}
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}
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}
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void keccak_dump_ctx(keccak_ctx_t* ctx){
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keccak_dump_state(ctx->a);
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cli_putstr_P(PSTR("\r\nDBG: r: "));
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cli_hexdump_rev(&(ctx->r), 2);
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cli_putstr_P(PSTR("\t c: "));
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cli_hexdump_rev(&(ctx->c), 2);
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cli_putstr_P(PSTR("\t d: "));
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cli_hexdump(&(ctx->d), 1);
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cli_putstr_P(PSTR("\t bs: "));
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cli_hexdump(&(ctx->bs), 1);
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}
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#endif
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static uint64_t rc[] PROGMEM = {
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0x0000000000000001LL, 0x0000000000008082LL,
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0x800000000000808ALL, 0x8000000080008000LL,
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0x000000000000808BLL, 0x0000000080000001LL,
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0x8000000080008081LL, 0x8000000000008009LL,
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0x000000000000008ALL, 0x0000000000000088LL,
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0x0000000080008009LL, 0x000000008000000ALL,
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0x000000008000808BLL, 0x800000000000008BLL,
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0x8000000000008089LL, 0x8000000000008003LL,
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0x8000000000008002LL, 0x8000000000000080LL,
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0x000000000000800ALL, 0x800000008000000ALL,
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0x8000000080008081LL, 0x8000000000008080LL,
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0x0000000080000001LL, 0x8000000080008008LL
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};
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uint64_t rotl64(uint64_t a, uint8_t r){
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return (a<<r)|(a>>(64-r));
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}
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static uint8_t r[5][5] PROGMEM = {
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{ 0, 36, 3, 41, 18 },
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{ 1, 44, 10, 45, 2 },
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{ 62, 6, 43, 15, 61 },
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{ 28, 55, 25, 21, 56 },
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{ 27, 20, 39, 8, 14 }
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};
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void keccak_round(uint64_t a[5][5], uint8_t rci){
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uint64_t b[5][5];
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uint8_t i,j;
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/* theta */
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for(i=0; i<5; ++i){
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b[i][0] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
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}
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for(i=0; i<5; ++i){
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b[i][1] = b[(4+i)%5][0] ^ rotl64(b[(i+1)%5][0], 1);
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2010-02-10 22:27:02 +00:00
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}
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for(i=0; i<5; ++i){
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for(j=0; j<5; ++j){
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2010-02-11 13:44:50 +00:00
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a[j][i] ^= b[i][1];
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2010-02-10 22:27:02 +00:00
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}
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}
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#if DEBUG
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cli_putstr_P(PSTR("\r\nAfter theta:"));
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keccak_dump_state(a);
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#endif
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/* rho & pi */
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for(i=0; i<5; ++i){
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for(j=0; j<5; ++j){
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b[(2*i+3*j)%5][j] = rotl64(a[j][i], pgm_read_byte(&(r[i][j])));
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}
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}
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#if DEBUG
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cli_putstr_P(PSTR("\r\n--- after rho & pi ---"));
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keccak_dump_state(a);
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#endif
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/* chi */
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for(i=0; i<5; ++i){
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for(j=0; j<5; ++j){
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a[j][i] = b[j][i] ^ ((~(b[j][(i+1)%5]))&(b[j][(i+2)%5]));
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}
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}
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#if DEBUG
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cli_putstr_P(PSTR("\r\nAfter chi:"));
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keccak_dump_state(a);
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#endif
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/* iota */
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uint64_t t;
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memcpy_P(&t, &(rc[rci]), 8);
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a[0][0] ^= t;
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#if DEBUG
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cli_putstr_P(PSTR("\r\nAfter iota:"));
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keccak_dump_state(a);
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#endif
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}
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void keccak_f1600(uint64_t a[5][5]){
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uint8_t i=0;
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do{
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#if DEBUG
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cli_putstr_P(PSTR("\r\n\r\n--- Round "));
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cli_hexdump(&i, 1);
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cli_putstr_P(PSTR(" ---"));
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#endif
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keccak_round(a, i);
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}while(++i<24);
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}
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void keccak_nextBlock(keccak_ctx_t* ctx, const void* block){
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memxor(ctx->a, block, ctx->bs);
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keccak_f1600(ctx->a);
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}
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void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
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while(length_b>=ctx->r){
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keccak_nextBlock(ctx, block);
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block = (uint8_t*)block + ctx->bs;
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length_b -= ctx->r;
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}
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uint8_t tmp[ctx->bs];
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uint8_t pad[3];
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memset(tmp, 0x00, ctx->bs);
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memcpy(tmp, block, (length_b+7)/8);
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/* appand 1 */
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if(length_b&7){
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/* we have some single bits */
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uint8_t t;
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t = tmp[length_b/8]>>(8-(length_b&7));
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t |= 0x01<<(length_b&7);
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tmp[length_b/8] = t;
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}else{
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tmp[length_b/8] = 0x01;
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}
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pad[0] = ctx->d;
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pad[1] = ctx->bs;
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pad[2] = 0x01;
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if(length_b/8+1+3<=ctx->bs){
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memcpy(tmp+length_b/8+1, pad, 3);
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}else{
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if(length_b/8+1+2<=ctx->bs){
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memcpy(tmp+length_b/8+1, pad, 2);
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keccak_nextBlock(ctx, tmp);
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memset(tmp, 0x00, ctx->bs);
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tmp[0]=0x01;
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}else{
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if(length_b/8+1+1<=ctx->bs){
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memcpy(tmp+length_b/8+1, pad, 1);
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keccak_nextBlock(ctx, tmp);
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memset(tmp, 0x00, ctx->bs);
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tmp[0] = ctx->bs;
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tmp[1] = 0x01;
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}else{
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keccak_nextBlock(ctx, tmp);
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memset(tmp, 0x00, ctx->bs);
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tmp[0] = ctx->d;
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tmp[1] = ctx->bs;
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tmp[2] = 0x01;
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}
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}
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}
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keccak_nextBlock(ctx, tmp);
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}
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void keccak_ctx2hash(void* dest, uint16_t length_b, keccak_ctx_t* ctx){
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while(length_b>=ctx->r){
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memcpy(dest, ctx->a, ctx->bs);
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dest = (uint8_t*)dest + ctx->bs;
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length_b -= ctx->r;
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keccak_f1600(ctx->a);
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}
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memcpy(dest, ctx->a, (length_b+7)/8);
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}
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void keccak224_ctx2hash(void* dest, keccak_ctx_t* ctx){
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keccak_ctx2hash(dest, 224, ctx);
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}
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void keccak256_ctx2hash(void* dest, keccak_ctx_t* ctx){
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keccak_ctx2hash(dest, 256, ctx);
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}
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void keccak384_ctx2hash(void* dest, keccak_ctx_t* ctx){
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keccak_ctx2hash(dest, 384, ctx);
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}
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void keccak512_ctx2hash(void* dest, keccak_ctx_t* ctx){
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keccak_ctx2hash(dest, 512, ctx);
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}
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/*
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1. SHA3-224: ⌊Keccak[r = 1152, c = 448, d = 28]⌋224
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2. SHA3-256: ⌊Keccak[r = 1088, c = 512, d = 32]⌋256
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3. SHA3-384: ⌊Keccak[r = 832, c = 768, d = 48]⌋384
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4. SHA3-512: ⌊Keccak[r = 576, c = 1024, d = 64]⌋512
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*/
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void keccak_init(uint16_t r, uint16_t c, uint8_t d, keccak_ctx_t* ctx){
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memset(ctx->a, 0x00, 5*5*8);
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ctx->r = r;
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ctx->c = c;
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ctx->d = d;
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ctx->bs = (uint8_t)(r/8);
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}
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void keccak224_init(keccak_ctx_t* ctx){
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keccak_init(1152, 448, 28, ctx);
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}
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void keccak256_init(keccak_ctx_t* ctx){
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keccak_init(1088, 512, 32, ctx);
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}
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void keccak384_init(keccak_ctx_t* ctx){
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keccak_init( 832, 768, 48, ctx);
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}
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void keccak512_init(keccak_ctx_t* ctx){
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keccak_init( 576, 1024, 64, ctx);
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}
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