154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/* 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 "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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#define DEBUG 0
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#if DEBUG
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#include "cli.h"
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#include "stdio.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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void keccak_f1600(uint64_t a[5][5]);
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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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memxor(ctx->a, block, (length_b)/8);
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/* append 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 = ((uint8_t*)block)[length_b / 8] >> (8 - (length_b & 7));
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t |= 0x01 << (length_b & 7);
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((uint8_t*)ctx->a)[length_b / 8] ^= t;
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}else{
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((uint8_t*)ctx->a)[length_b / 8] ^= 0x01;
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}
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if(length_b / 8 + 1 + 3 <= ctx->bs){
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*((uint8_t*)ctx->a + length_b / 8 + 1) ^= ctx->d;
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*((uint8_t*)ctx->a + length_b / 8 + 2) ^= ctx->bs;
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*((uint8_t*)ctx->a + length_b / 8 + 3) ^= 1;
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}else{
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if(length_b / 8 + 1 + 2 <= ctx->bs){
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*((uint8_t*)ctx->a + length_b / 8 + 1) ^= ctx->d;
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*((uint8_t*)ctx->a + length_b / 8 + 2) ^= ctx->bs;
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keccak_f1600(ctx->a);
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((uint8_t*)ctx->a)[0] ^= 0x01;
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}else{
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if(length_b/8+1+1 <= ctx->bs){
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*((uint8_t*)ctx->a + length_b / 8 + 1) ^= ctx->d;
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keccak_f1600(ctx->a);
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((uint8_t*)ctx->a)[0] ^= ctx->bs;
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((uint8_t*)ctx->a)[1] ^= 0x01;
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}else{
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keccak_f1600(ctx->a);
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((uint8_t*)ctx->a)[0] ^= ctx->d;
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((uint8_t*)ctx->a)[1] ^= ctx->bs;
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((uint8_t*)ctx->a)[2] ^= 0x01;
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}
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}
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}
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keccak_f1600(ctx->a);
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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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