--- /dev/null
+/* echo.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 "echo.h"
+#include "gf256mul.h"
+#include "memxor.h"
+#include <stdint.h>
+#include <string.h>
+
+#ifdef DEBUG
+#undef DEBUG
+#endif
+
+#define DEBUG 0
+
+#if DEBUG
+#define DEBUG_DEPTH 2
+#include "cli.h"
+#endif
+
+void aes_encrypt_round(void* state, void* key);
+
+#define INDEX(c,r) ((r)*16*4+(c)*16)
+
+#define GF256MUL_1(a) (a)
+#define GF256MUL_2(a) (gf256mul(2, (a), 0x1b))
+#define GF256MUL_3(a) (gf256mul(3, (a), 0x1b))
+
+/*
+static void mixcol_2(uint8_t* s){
+ uint8_t t, tmp[4];
+ memcpy(tmp, s, 4);
+ t = tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3];
+ s[0] =
+ GF256MUL_2(tmp[0]^tmp[1])
+ ^ tmp[0]
+ ^ t;
+ s[1] =
+ GF256MUL_2(tmp[1]^tmp[2])
+ ^ tmp[1]
+ ^ t;
+ s[2] =
+ GF256MUL_2(tmp[2]^tmp[3])
+ ^ tmp[2]
+ ^ t;
+ s[3] =
+ GF256MUL_2(tmp[3]^tmp[0])
+ ^ tmp[3]
+ ^ t;
+}
+*/
+
+static void mixcol(uint8_t* a, uint8_t* b, uint8_t* c, uint8_t* d){
+ uint8_t t, tmp[4];
+ tmp[0] = *a;
+ tmp[1] = *b;
+ tmp[2] = *c;
+ tmp[3] = *d;
+
+ t = tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3];
+ *a =
+ GF256MUL_2(tmp[0]^tmp[1])
+ ^ tmp[0]
+ ^ t;
+ *b =
+ GF256MUL_2(tmp[1]^tmp[2])
+ ^ tmp[1]
+ ^ t;
+ *c =
+ GF256MUL_2(tmp[2]^tmp[3])
+ ^ tmp[2]
+ ^ t;
+ *d =
+ GF256MUL_2(tmp[3]^tmp[0])
+ ^ tmp[3]
+ ^ t;
+}
+
+#if DEBUG
+static void dump_state(void* s){
+ uint8_t row, col;
+ for(col=0; col<4; col++){
+ for(row=0; row<4; row++){
+ cli_putstr_P(PSTR("\r\nrow "));
+ cli_putc('0'+row);
+ cli_putstr_P(PSTR(", col "));
+ cli_putc('0'+col);
+ cli_putstr_P(PSTR(": "));
+ cli_hexdump((uint8_t*)s+col*16+row*16*4, 4);
+ cli_putc(' ');
+ cli_hexdump((uint8_t*)s+col*16+row*16*4+ 4, 4);
+ cli_putc(' ');
+ cli_hexdump((uint8_t*)s+col*16+row*16*4+ 8, 4);
+ cli_putc(' ');
+ cli_hexdump((uint8_t*)s+col*16+row*16*4+12, 4);
+ }
+ }
+}
+#endif
+
+static void compress512(void* v, void* m, uint64_t* c, void* salt){
+ uint8_t i, j, l;
+ uint8_t s[16*16];
+ uint8_t k[16];
+/*
+ memcpy(s, v, 16*4); / * load v into state * /
+ memcpy(s+16*4, m, 16*12); / * load m into state * /
+*/
+ for(i=0; i<4; ++i){
+ memcpy(s+4*16*i, (uint8_t*)v+16*i, 16);
+ }
+ for(i=1; i<4; ++i){
+ for(j=0; j<4; ++j){
+ memcpy(s+i*16+j*16*4, m, 16);
+ m = (uint8_t*)m + 16;
+ }
+ }
+ memcpy(k, c, 8);
+ memset(k+8, 0, 8);
+ for(i=0; i<8; ++i){
+ /* BIG.SubWords */
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n === ROUND "));
+ cli_putc('1'+i);
+ cli_putstr_P(PSTR(" ==="));
+ if(i<DEBUG_DEPTH){
+ dump_state(s);
+ }
+#endif
+ for(j=0; j<4; ++j){
+ for(l=0; l<4; ++l){
+ aes_encrypt_round(s+16*l*4+16*j, k);
+ aes_encrypt_round(s+16*l*4+16*j, salt);
+ *((uint64_t*)(k)) += 1;
+ }
+ }
+#if DEBUG
+ if(i<DEBUG_DEPTH){
+ cli_putstr_P(PSTR("\r\nAfter SubWords"));
+ dump_state(s);
+ }
+#endif
+ /* BIG.ShiftRows */
+ uint8_t t[16];
+ /* "Row" 1 */
+ memcpy(t, s+INDEX(0, 1), 16);
+ memcpy(s+INDEX(0, 1), s+INDEX(1, 1), 16);
+ memcpy(s+INDEX(1, 1), s+INDEX(2, 1), 16);
+ memcpy(s+INDEX(2, 1), s+INDEX(3, 1), 16);
+ memcpy(s+INDEX(3, 1), t, 16);
+ /* "Row" 2 */
+ memcpy(t, s+INDEX(0, 2), 16);
+ memcpy(s+INDEX(0, 2), s+INDEX(2, 2), 16);
+ memcpy(s+INDEX(2, 2), t, 16);
+ memcpy(t, s+INDEX(1, 2), 16);
+ memcpy(s+INDEX(1, 2), s+INDEX(3, 2), 16);
+ memcpy(s+INDEX(3, 2), t, 16);
+ /* "Row" 3 */
+ memcpy(t, s+INDEX(0, 3), 16);
+ memcpy(s+INDEX(0, 3), s+INDEX(3, 3), 16);
+ memcpy(s+INDEX(3, 3), s+INDEX(2, 3), 16);
+ memcpy(s+INDEX(2, 3), s+INDEX(1, 3), 16);
+ memcpy(s+INDEX(1, 3), t, 16);
+#if DEBUG
+ if(i<DEBUG_DEPTH){
+ cli_putstr_P(PSTR("\r\nAfter ShiftRows"));
+ dump_state(s);
+ }
+#endif
+ /* BIG.MixColumns */
+ /*
+ for(j=0; j<64; ++j){
+ mixcol(s+j*4);
+ }
+ */
+ for(j=0; j<64; ++j){
+ mixcol(s+j, s+j+64, s+j+64*2, s+j+64*3);
+ }
+#if DEBUG
+ if(i<DEBUG_DEPTH){
+ cli_putstr_P(PSTR("\r\nAfter MixColumns"));
+ dump_state(s);
+ }
+#endif
+ }
+
+ /* BIG.Final */
+ /*
+ for(i=0; i<3; ++i){
+ memxor(v, (uint8_t*)m+4*16*i, 4*16);
+ }
+ for(i=0; i<4; ++i){
+ memxor(v, s+4*16*i, 4*16);
+ }
+ */
+ m = (uint8_t*)m - ECHO_SMALL_BLOCKSIZE_B;
+ for(i=0; i<3; ++i){
+ memxor(v, (uint8_t*)m+4*16*i, 4*16);
+ }
+
+ for(i=0; i<4; ++i){
+ for(j=0; j<4; ++j){
+ memxor((uint8_t*)v+16*i, s+4*16*i+16*j, 16);
+ }
+ }
+
+}
+
+void echo_small_nextBlock(echo_small_ctx_t* ctx, void* block){
+ ctx->counter += ECHO_SMALL_BLOCKSIZE;
+ compress512(ctx->v, block, &(ctx->counter), ctx->salt);
+}
+
+void echo_small_lastBlock(echo_small_ctx_t* ctx, void* block, uint16_t length_b){
+ while(length_b>=ECHO_SMALL_BLOCKSIZE){
+ echo_small_nextBlock(ctx, block);
+ block = (uint8_t*)block + ECHO_SMALL_BLOCKSIZE_B;
+ length_b -= ECHO_SMALL_BLOCKSIZE;
+ }
+ uint8_t buffer[ECHO_SMALL_BLOCKSIZE_B];
+ uint64_t total_len;
+ memset(buffer, 0, ECHO_SMALL_BLOCKSIZE_B);
+ memcpy(buffer, block, (length_b+7)/8);
+ buffer[length_b/8] |= 0x80 >> (length_b&7);
+ total_len = (ctx->counter += length_b);
+ if(length_b>=ECHO_SMALL_BLOCKSIZE-144){
+ compress512(ctx->v, buffer, &total_len, ctx->salt);
+ memset(buffer, 0, ECHO_SMALL_BLOCKSIZE_B);
+ ctx->counter = 0;
+ }
+ if(length_b==0){
+ ctx->counter = 0;
+ }
+ memcpy(buffer+ECHO_SMALL_BLOCKSIZE_B-18, &(ctx->id), 2);
+ memcpy(buffer+ECHO_SMALL_BLOCKSIZE_B-16, &total_len, 8);
+ compress512(ctx->v, buffer, &(ctx->counter), ctx->salt);
+}
+
+/******************************************************************************/
+
+void echo_small_ctx2hash(void* dest, uint16_t length_b, echo_small_ctx_t* ctx){
+ memcpy(dest, ctx->v, (length_b+7)/8);
+}
+
+void echo224_ctx2hash(void* dest, echo_small_ctx_t* ctx){
+ memcpy(dest, ctx->v, 224/8);
+}
+
+void echo256_ctx2hash(void* dest, echo_small_ctx_t* ctx){
+ memcpy(dest, ctx->v, 256/8);
+}
+
+/******************************************************************************/
+
+void echo224_init(echo_small_ctx_t* ctx){
+ memset(ctx->v, 0, 4*16);
+ ctx->counter = 0;
+ memset(ctx->salt, 0, 16);
+ ctx->id = 0x00E0;
+ ctx->v[0+16*0] = 0xE0;
+ ctx->v[0+16*1] = 0xE0;
+ ctx->v[0+16*2] = 0xE0;
+ ctx->v[0+16*3] = 0xE0;
+}
+
+void echo256_init(echo_small_ctx_t* ctx){
+ memset(ctx->v, 0, 4*16);
+ ctx->counter = 0;
+ memset(ctx->salt, 0, 16);
+ ctx->id = 0x0100;
+ ctx->v[1+16*0] = 0x01;
+ ctx->v[1+16*1] = 0x01;
+ ctx->v[1+16*2] = 0x01;
+ ctx->v[1+16*3] = 0x01;
+}
+
+/******************************************************************************/
+
projects / avr-crypto-lib.git / blobdiff