--- /dev/null
+/* whirlpool.c */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2006-2011 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 <avr/pgmspace.h>
+#include <string.h>
+#include "gf256mul.h"
+#include "memxor.h"
+#include "whirlpool.h"
+
+#define DEBUG 0
+
+#if DEBUG
+#include "cli.h"
+#endif
+
+/*
+u 0 1 2 3 4 5 6 7 8 9 A B C D E F
+E(u) 1 B 9 C D 6 F 3 E 8 7 4 A 2 5 0
+E -1(u) F 0 D 7 B E 5 A 9 2 C 1 3 4 8 6
+*/
+static uint8_t eeinv_box[16] PROGMEM = {
+ /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
+ 0x1F, 0xB0, 0x9D, 0xC7, 0xDB, 0x6E, 0xF5, 0x3A,
+ 0xE9, 0x82, 0x7C, 0x41, 0xA3, 0x24, 0x58, 0x06
+};
+
+static uint8_t r_box[16] PROGMEM = {
+ 0x77, 0xCC, 0xBB, 0xDD, 0xEE, 0x44, 0x99, 0xFF,
+ 0x66, 0x33, 0x88, 0xAA, 0x22, 0x55, 0x11, 0x00
+};
+
+uint8_t whirlpool_sbox(uint8_t a){
+ uint8_t b,c,d;
+ b = pgm_read_byte(eeinv_box+(a&0x0f));
+ d = pgm_read_byte(eeinv_box+(a>>4));
+ c = ((d>>4)^b)&0x0f;
+ b = (b&0x0f)|(d&0xf0);
+ b ^= pgm_read_byte(r_box+c);
+ c = pgm_read_byte(eeinv_box+(b&0x0f))&0x0f;
+ c |= pgm_read_byte(eeinv_box+(b>>4))&0xf0;
+ return c;
+}
+
+static void gamma(uint8_t* a){
+ uint8_t i;
+ for(i=0; i<64; ++i){
+ *a = whirlpool_sbox(*a);
+ ++a;
+ }
+}
+
+static void pi(uint8_t* a){
+ uint8_t b[8];
+ uint8_t i,j;
+ for(i=1; i<8; ++i){
+ for(j=0; j<8; ++j){
+ b[j] = a[i+8*((8+j-i)%8)];
+ }
+ for(j=0; j<8; ++j){
+ a[j*8+i] = b[j];
+ }
+ }
+}
+
+static uint8_t theta_matrix[8] PROGMEM = {
+ 0x1, 0x1, 0x4, 0x1, 0x8, 0x5, 0x2, 0x9
+};
+
+#define POLYNOM 0x1D
+
+static void theta(uint8_t* a){
+ uint8_t b[8], c, accu;
+ uint8_t i,j,k;
+ for(i=0; i<8; ++i){
+ for(j=0; j<8;++j){
+ accu = 0;
+ for(k=0; k<8; ++k){
+ c = pgm_read_byte(theta_matrix+((8+j-k)%8));
+ accu ^= gf256mul(a[8*i+k], c, POLYNOM);
+ }
+ b[j] = accu;
+ }
+ memcpy(a+8*i, b, 8);
+ }
+}
+
+static void w_round(uint8_t* a, const uint8_t* k){
+ gamma(a);
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n pre-pi:"));
+ cli_hexdump_block(a, 64, 4, 8);
+#endif
+ pi(a);
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n post-pi & pre-theta:"));
+ cli_hexdump_block(a, 64, 4, 8);
+#endif
+ theta(a);
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n post-theta:"));
+ cli_hexdump_block(a, 64, 4, 8);
+#endif
+ memxor(a, k, 64);
+}
+
+static void w_enc(uint8_t *a, const uint8_t* k){
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n== w_enc ==\r\n w'_00:"));
+ cli_hexdump_block(a, 64, 4, 8);
+ cli_putstr_P(PSTR("\r\n k_00:"));
+ cli_hexdump_block(k, 64, 4, 8);
+#endif
+ uint8_t rk[64], rc[64];
+ uint8_t r,i;
+ memxor(a, k, 64);
+ memcpy(rk, k, 64);
+ memset(rc+8, 0, 56);
+ for(r=0; r<10; ++r){
+ for(i=0; i<8; ++i){
+ rc[i] = whirlpool_sbox(r*8+i);
+ }
+ w_round(rk, rc);
+ w_round(a, rk);
+#if DEBUG
+ cli_putstr_P(PSTR("\r\n w'_"));
+ cli_hexdump_byte(r+1);
+ cli_putc(':');
+ cli_hexdump_block(a, 64, 4, 8);
+ cli_putstr_P(PSTR("\r\n k_"));
+ cli_hexdump_byte(r+1);
+ cli_putc(':');
+ cli_hexdump_block(rk, 64, 4, 8);
+#endif
+ }
+}
+
+void whirlpool_init(whirlpool_ctx_t* ctx){
+ memset(ctx->s, 0, 64);
+ ctx->blocks = 0;
+}
+
+void whirlpool_nextBlock(whirlpool_ctx_t* ctx, const void* block){
+ uint8_t state[64];
+ ctx->blocks += 1;
+ memcpy(state, block, 64);
+ w_enc(state, (uint8_t*)(ctx->s));
+ memxor(ctx->s, state, 64);
+ memxor((ctx->s), block, 64);
+}
+
+void whirlpool_lastBlock(whirlpool_ctx_t* ctx, const void* block, uint16_t length_b){
+ while(length_b>=512){
+ whirlpool_nextBlock(ctx, block);
+ block = (uint8_t*)block + 64;
+ length_b -= 512;
+ }
+ uint8_t buffer[64];
+ uint8_t i=8;
+ uint64_t length;
+ length = ctx->blocks*512+length_b;
+ memset(buffer, 0, 64);
+ memcpy(buffer, block, (length_b+7)/8);
+ buffer[length_b/8] |= 0x80>>(length_b&7);
+ if(length_b>255){
+ whirlpool_nextBlock(ctx, buffer);
+ memset(buffer, 0, 56);
+ }
+ do{
+ buffer[56+(--i)] = length&0xff;
+ length >>= 8;
+ }while(i);
+ whirlpool_nextBlock(ctx, buffer);
+}
+
+void whirlpool_ctx2hash(void* dest, const whirlpool_ctx_t* ctx){
+ memcpy(dest, (ctx->s), 64);
+}
projects / avr-crypto-lib.git / blobdiff