--- /dev/null
+/* cubehash.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/>.
+*/
+/**
+ * \file cubehash.c
+ * \email daniel.otte@rub.de
+ * \author Daniel Otte
+ * \date 2010-02-20
+ * \license GPLv3 or later
+ *
+ */
+
+
+#include "memxor.h"
+#include "cubehash.h"
+#include <string.h>
+#include <stdint.h>
+
+static uint32_t rol32(uint32_t a, uint8_t r){
+ return (a<<r)|(a>>(32-r));
+}
+/*
+• Add x_0jklm into x_1jklm modulo 232 , for each (j, k, l, m).
+• Rotate x_0jklm upwards by 7 bits, for each (j, k, l, m).
+• Swap x_00klm with x_01klm , for each (k, l, m).
+• Xor x_1jklm into x_0jklm , for each (j, k, l, m).
+• Swap x_1jk0m with x_1jk1m , for each (j, k, m).
+• Add x_0jklm into x_1jklm modulo 232 , for each (j, k, l, m).
+• Rotate x_0jklm upwards by 11 bits, for each (j, k, l, m).
+• Swap x_0j0lm with x_0j1lm , for each (j, l, m).
+• Xor x_1jklm into x_0jklm , for each (j, k, l, m).
+• Swap x_1jkl0 with x_1jkl1 , for each (j, k, l).
+*/
+
+static void cubehash_round(cubehash_ctx_t* ctx){
+ uint8_t i;
+ uint32_t t;
+ for(i=0; i<16; ++i){
+ ctx->a[i+16] += ctx->a[i];
+ }
+ for(i=0; i<16; ++i){
+ ctx->a[i] = rol32(ctx->a[i], 7);
+ }
+ for(i=0; i<8; ++i){
+ t = ctx->a[i];
+ ctx->a[i] = ctx->a[i+8];
+ ctx->a[i+8] = t;
+ }
+ for(i=0; i<16; ++i){
+ ctx->a[i] ^= ctx->a[i+16];
+ }
+ for(i=16; i<4*4+16; i+=4){
+ t = ctx->a[i];
+ ctx->a[i] = ctx->a[i+2];
+ ctx->a[i+2] = t;
+ t = ctx->a[i+1];
+ ctx->a[i+1] = ctx->a[i+3];
+ ctx->a[i+3] = t;
+ }
+ for(i=0; i<16; ++i){
+ ctx->a[i+16] += ctx->a[i];
+ }
+ for(i=0; i<16; ++i){
+ ctx->a[i] = rol32(ctx->a[i], 11);
+ }
+ for(i=0; i<4; ++i){
+ t = ctx->a[i];
+ ctx->a[i] = ctx->a[i+4];
+ ctx->a[i+4] = t;
+ }
+ for(i=8; i<4+8; ++i){
+ t = ctx->a[i];
+ ctx->a[i] = ctx->a[i+4];
+ ctx->a[i+4] = t;
+ }
+ for(i=0; i<16; ++i){
+ ctx->a[i] ^= ctx->a[i+16];
+ }
+ for(i=16; i<16+16; i+=2){
+ t = ctx->a[i];
+ ctx->a[i] = ctx->a[i+1];
+ ctx->a[i+1] = t;
+ }
+}
+
+void cubehash_init(uint8_t r, uint8_t b, uint16_t h, cubehash_ctx_t* ctx){
+ memset(ctx->a, 0, 32*4);
+ ctx->a[0] = h/8;
+ ctx->a[1] = b;
+ ctx->a[2] = r;
+ ctx->rounds = r;
+ ctx->blocksize_B = b;
+ for(b=0; b<10*r; ++b){
+ cubehash_round(ctx);
+ }
+}
+
+void cubehash_nextBlock(cubehash_ctx_t* ctx, void* block){
+ uint8_t i;
+ memxor(ctx->a, block, ctx->blocksize_B);
+ for(i=0; i<ctx->rounds; ++i){
+ cubehash_round(ctx);
+ }
+}
+
+void cubehash_lastBlock(cubehash_ctx_t* ctx, void* block, uint16_t length_b){
+ while(length_b>=ctx->blocksize_B*8){
+ cubehash_nextBlock(ctx, block);
+ block = (uint8_t*)block + ctx->blocksize_B;
+ length_b -= ctx->blocksize_B*8;
+ }
+ uint8_t buffer[ctx->blocksize_B];
+ uint8_t i;
+ memset(buffer, 0, ctx->blocksize_B);
+ memcpy(buffer, block, (length_b+7)/8);
+ buffer[length_b/8] |= 0x80 >> (length_b&7);
+ cubehash_nextBlock(ctx, buffer);
+ ctx->a[31] ^= 1;
+ for(i=0; i<10*(ctx->rounds); ++i){
+ cubehash_round(ctx);
+ }
+}
+
+void cubehash_ctx2hash(void* dest, uint16_t length_b, cubehash_ctx_t* ctx){
+ memcpy(dest, ctx->a, (length_b+7)/8);
+}
+
+/******************************************************************************/
+
+void cubehash224_init(cubehash_ctx_t* ctx){
+ cubehash_init(16, 32, 224, ctx);
+}
+
+void cubehash224_ctx2hash(void* dest, cubehash_ctx_t* ctx){
+ cubehash_ctx2hash(dest, 224, ctx);
+}
+
+/******************************************************************************/
+
+void cubehash256_init(cubehash_ctx_t* ctx){
+ cubehash_init(16, 32, 256, ctx);
+}
+
+void cubehash256_ctx2hash(void* dest, cubehash_ctx_t* ctx){
+ cubehash_ctx2hash(dest, 256, ctx);
+}
+
+/******************************************************************************/
+
+void cubehash384_init(cubehash_ctx_t* ctx){
+ cubehash_init(16, 32, 384, ctx);
+}
+
+void cubehash384_ctx2hash(void* dest, cubehash_ctx_t* ctx){
+ cubehash_ctx2hash(dest, 384, ctx);
+}
+
+/******************************************************************************/
+
+void cubehash512_init(cubehash_ctx_t* ctx){
+ cubehash_init(16, 32, 512, ctx);
+}
+
+void cubehash512_ctx2hash(void* dest, cubehash_ctx_t* ctx){
+ cubehash_ctx2hash(dest, 512, ctx);
+}
projects / avr-crypto-lib.git / blobdiff