--- /dev/null
+/* twister-large.c */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2008 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 <string.h>
+#include "memxor.h"
+#include "twister.h"
+#include "twister-large.h"
+
+/*********************************************************************/
+
+static
+void checksum_update(twister_large_ctx_t* ctx, uint8_t col){
+ uint8_t i, col2;
+ uint8_t carry = 0;
+ int sum = 0;
+
+ col2 = (col+1)%8;
+
+ for( i=0; i<8; i++ )
+ {
+ sum = (int) ctx->checksum[col2][7-i]
+ + (int) ctx->state.s[7-i][0] /* col or 0 ???*/
+ + carry;
+ ctx->checksum[col][7-i] ^= (uint8_t)sum;
+ carry = sum>>8;
+
+ }
+}
+
+/*********************************************************************/
+
+void twister_large_init(twister_large_ctx_t* ctx, uint16_t hashsize_b){
+ memset(ctx->state.s, 0, 64);
+ memset(ctx->checksum, 0, 64);
+ ctx->state.counter=0xffffffffffffffffLL;
+ ctx->state.s[0][7] = hashsize_b>>8;
+ ctx->state.s[1][7] = hashsize_b&0xff;
+ ctx->state.length_counter_b = 0;
+}
+
+/*********************************************************************/
+
+void twister_large_nextBlock(twister_large_ctx_t* ctx, const void* msg){
+ uint8_t tmp[8][8];
+
+ /* 1st maxi round */
+ memcpy(tmp, ctx->state.s, 64);
+ checksum_update(ctx, 0);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+
+ checksum_update(ctx, 1);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+
+ checksum_update(ctx, 2);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+ memxor(ctx->state.s, tmp, 64);
+
+ /* 2nd maxi round */
+ memcpy(tmp, ctx->state.s, 64);
+ checksum_update(ctx, 3);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+
+ twister_blank_round(&(ctx->state));
+
+ checksum_update(ctx, 4);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+ memxor(ctx->state.s, tmp, 64);
+
+ /* 3rd maxi round */
+ memcpy(tmp, ctx->state.s, 64);
+ checksum_update(ctx, 5);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+
+ checksum_update(ctx, 6);
+ twister_mini_round(&(ctx->state), msg);
+ msg = (uint8_t*)msg + 8;
+
+ checksum_update(ctx, 7);
+ twister_mini_round(&(ctx->state), msg);
+
+ twister_blank_round(&(ctx->state));
+ memxor(ctx->state.s, tmp, 64);
+ ctx->state.length_counter_b += 512;
+}
+
+/*********************************************************************/
+
+void twister_inject_chksum(twister_large_ctx_t* ctx, uint8_t col){
+ *((uint64_t*)(&ctx->state.s[7][0])) ^= *((uint64_t*)(&ctx->checksum[col][0]));
+ twister_blank_round(&ctx->state);
+}
+
+/*********************************************************************/
+
+void twister_large_lastBlock(twister_large_ctx_t* ctx, const void* msg, uint16_t length_b){
+ uint8_t tmp[64];
+ while(length_b>=512){
+ twister_large_nextBlock(ctx, msg);
+ msg = ((uint8_t*)msg)+64;
+ length_b -= 512;
+ }
+ memset(tmp, 0, 64);
+ memcpy(tmp, msg, (length_b+7)/8);
+ tmp[length_b/8] |= 0x80 >> (length_b&0x07);
+ twister_large_nextBlock(ctx, tmp);
+ ctx->state.length_counter_b -= 512 - length_b;
+ twister_mini_round(&(ctx->state), &(ctx->state.length_counter_b));
+
+ memcpy(tmp, ctx->state.s, 64);
+ twister_inject_chksum(ctx, 0);
+ twister_inject_chksum(ctx, 1);
+ twister_inject_chksum(ctx, 2);
+ memxor(ctx->state.s, tmp, 64);
+
+ memcpy(tmp, ctx->state.s, 64);
+ twister_inject_chksum(ctx, 3);
+ twister_inject_chksum(ctx, 4);
+ twister_inject_chksum(ctx, 5);
+ memxor(ctx->state.s, tmp, 64);
+
+ memcpy(tmp, ctx->state.s, 64);
+ twister_inject_chksum(ctx, 6);
+ twister_inject_chksum(ctx, 7);
+ twister_blank_round(&(ctx->state));
+ memxor(ctx->state.s, tmp, 64);
+
+}
+
+/*********************************************************************/
+
+void twister_large_ctx2hash(void* dest, twister_large_ctx_t* ctx, uint16_t hashsize_b){
+ twister_ctx2hash(dest, &(ctx->state), hashsize_b);
+}
+
+/*********************************************************************/
+/*********************************************************************/
+
+void twister384_init(twister384_ctx_t* ctx){
+ twister_large_init(ctx, 384);
+}
+
+/*********************************************************************/
+
+void twister384_nextBlock(twister384_ctx_t* ctx, const void* msg){
+ twister_large_nextBlock(ctx, msg);
+}
+
+/*********************************************************************/
+
+void twister384_lastBlock(twister384_ctx_t* ctx, const void* msg, uint16_t length_b){
+ twister_large_lastBlock(ctx, msg, length_b);
+}
+
+/*********************************************************************/
+
+void twister384_ctx2hash(void* dest, twister384_ctx_t* ctx){
+ twister_large_ctx2hash(dest, ctx, 384);
+}
+
+/*********************************************************************/
+
+void twister384(void* dest, const void* msg, uint32_t msg_length_b){
+ twister_large_ctx_t ctx;
+ twister_large_init(&ctx, 384);
+ while(msg_length_b >=512){
+ twister_large_nextBlock(&ctx, msg);
+ msg = (uint8_t*)msg + 512/8;
+ msg_length_b -= 512;
+ }
+ twister_large_lastBlock(&ctx, msg, msg_length_b);
+ twister_large_ctx2hash(dest, &ctx, 384);
+}
+
+/*********************************************************************/
+/*********************************************************************/
+
+
+void twister512_init(twister512_ctx_t* ctx){
+ twister_large_init(ctx, 512);
+}
+
+/*********************************************************************/
+
+void twister512_nextBlock(twister512_ctx_t* ctx, const void* msg){
+ twister_large_nextBlock(ctx, msg);
+}
+
+/*********************************************************************/
+
+void twister512_lastBlock(twister512_ctx_t* ctx, const void* msg, uint16_t length_b){
+ twister_large_lastBlock(ctx, msg, length_b);
+}
+
+/*********************************************************************/
+
+void twister512_ctx2hash(void* dest, twister512_ctx_t* ctx){
+ twister_large_ctx2hash(dest, ctx, 512);
+}
+
+/*********************************************************************/
+
+void twister512(void* dest, const void* msg, uint32_t msg_length_b){
+ twister_large_ctx_t ctx;
+ twister_large_init(&ctx, 512);
+ while(msg_length_b >=512){
+ twister_large_nextBlock(&ctx, msg);
+ msg = (uint8_t*)msg + 512/8;
+ msg_length_b -= 512;
+ }
+ twister_large_lastBlock(&ctx, msg, msg_length_b);
+ twister_large_ctx2hash(dest, &ctx, 512);
+}
+
+
+
projects / avr-crypto-lib.git / blobdiff