--- /dev/null
+/* 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 "keccak.h"
+
+#define W 64
+
+#ifdef DEBUG
+# undef DEBUG
+#endif
+
+#define DEBUG 1
+
+
+#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
+
+#undef DEBUG
+
+static 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
+};
+
+uint64_t rotl64(uint64_t a, uint8_t r){
+ return (a<<r)|(a>>(64-r));
+}
+
+static uint8_t r[5][5] PROGMEM = {
+ { 0, 36, 3, 41, 18 },
+ { 1, 44, 10, 45, 2 },
+ { 62, 6, 43, 15, 61 },
+ { 28, 55, 25, 21, 56 },
+ { 27, 20, 39, 8, 14 }
+};
+
+void keccak_round(uint64_t a[5][5], uint8_t rci){
+ uint64_t c[5], d[5], b[5][5];
+ uint8_t i,j;
+ /* theta */
+ for(i=0; i<5; ++i){
+ c[i] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
+ }
+ for(i=0; i<5; ++i){
+ d[i] = c[(4+i)%5] ^ rotl64(c[(i+1)%5], 1);
+ }
+ for(i=0; i<5; ++i){
+ for(j=0; j<5; ++j){
+ a[j][i] ^= d[i];
+ }
+ }
+#if DEBUG
+ cli_putstr_P(PSTR("\r\nAfter theta:"));
+ keccak_dump_state(a);
+#endif
+ /* rho & pi */
+ for(i=0; i<5; ++i){
+ for(j=0; j<5; ++j){
+ b[(2*i+3*j)%5][j] = rotl64(a[j][i], pgm_read_byte(&(r[i][j])));
+ }
+ }
+#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][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 */
+ uint64_t t;
+ memcpy_P(&t, &(rc[rci]), 8);
+ a[0][0] ^= t;
+#if DEBUG
+ cli_putstr_P(PSTR("\r\nAfter iota:"));
+ keccak_dump_state(a);
+#endif
+}
+
+void keccak_f1600(uint64_t a[5][5]){
+ 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(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){
+ while(length_b>=ctx->r){
+ keccak_nextBlock(ctx, block);
+ block = (uint8_t*)block + ctx->bs;
+ length_b -= ctx->r;
+ }
+ uint8_t tmp[ctx->bs];
+ uint8_t pad[3];
+ memset(tmp, 0x00, ctx->bs);
+ memcpy(tmp, block, (length_b+7)/8);
+ /* appand 1 */
+ if(length_b&7){
+ /* we have some single bits */
+ uint8_t t;
+ t = tmp[length_b/8]>>(8-(length_b&7));
+ t |= 0x01<<(length_b&7);
+ tmp[length_b/8] = t;
+ }else{
+ tmp[length_b/8] = 0x01;
+ }
+ pad[0] = ctx->d;
+ pad[1] = ctx->bs;
+ pad[2] = 0x01;
+ if(length_b/8+1+3<ctx->bs){
+ memcpy(tmp+length_b/8+1, pad, 3);
+ }else{
+ if(length_b/8+1+2<ctx->bs){
+ memcpy(tmp+length_b/8+1, pad, 2);
+ keccak_nextBlock(ctx, tmp);
+ memset(tmp, 0x00, ctx->bs);
+ tmp[0]=0x01;
+ }else{
+ if(length_b/8+1+1<ctx->bs){
+ memcpy(tmp+length_b/8+1, pad, 1);
+ keccak_nextBlock(ctx, tmp);
+ memset(tmp, 0x00, ctx->bs);
+ tmp[0] = ctx->bs;
+ tmp[1] = 0x01;
+ }else{
+ keccak_nextBlock(ctx, tmp);
+ memset(tmp, 0x00, ctx->bs);
+ tmp[0] = ctx->d;
+ tmp[1] = ctx->bs;
+ tmp[2] = 0x01;
+ }
+ }
+ }
+ keccak_nextBlock(ctx, tmp);
+ keccak_dump_ctx(ctx);
+}
+
+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, uint16_t c, uint8_t d, keccak_ctx_t* ctx){
+ memset(ctx->a, 0x00, 5*5*8);
+ ctx->r = r;
+ ctx->c = c;
+ ctx->d = d;
+ ctx->bs = (uint8_t)(r/8);
+}
+
+void keccak224_init(keccak_ctx_t* ctx){
+ keccak_init(1152, 448, 28, ctx);
+}
+
+void keccak256_init(keccak_ctx_t* ctx){
+ keccak_init(1088, 512, 32, ctx);
+}
+
+void keccak384_init(keccak_ctx_t* ctx){
+ keccak_init( 832, 768, 48, ctx);
+}
+
+void keccak512_init(keccak_ctx_t* ctx){
+ keccak_init( 576, 1024, 64, ctx);
+}
projects / avr-crypto-lib.git / blobdiff