modified structure

[avr-crypto-lib.git] / entropium.c

diff --git a/entropium.c b/entropium.c
deleted file mode 100644 (file)
index ed56607..0000000
--- a/entropium.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/* entropium.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    entropium.c
- * \author  Daniel Otte
- * \email   daniel.otte@rub.de
- * \date    2006-05-17
- * \license    GPLv3 or later
- * \brief      This file contains an implementaition of a pseudo-random-number generator.
- * 
- * Extension 1:
- *     rndCore is expanded to 512 bits for more security.
- *
-  \verbatim
-                       ################################################################################################
-                       #                                                                                              #
-                       #         +---------------------------+                                                        #
-                       #         |                           |                                                        #
-                       #         V                           |                                                        #
-                       #      (concat)                       |                                                        #
-   +---------------+   #    o---------o             (xor)+---------+      o---------o        o----o     o---------o   #    +--------------+
-   | entropy Block | -----> | sha-256 | --(offset)-<     | rndCore | ---> | sha-256 | --+----| +1 |---> | sha-256 | -----> | random Block |
-   +---------------+   #    o---------o             (xor)+---------+      o---------o   |    o----o     o---------o   #    +--------------+
-                       #                                 (xor) (xor)                    |                             #
-                       #                                   ^     ^                      |                             #
-                       #                                    \   /                       |                             #
-                       #                                   (offset)---------------------+                             #
-                       #                                                                                              #
-                       ################################################################################################
-  \endverbatim
- */
-
-#include <stdint.h>
-#include <string.h>
-#include "sha256.h"
-#include "entropium.h"
-
-/**
- * \brief secret entropy pool. 
- * This is the core of the random which is generated
- */
-uint32_t rndCore[16]; 
-
-/*************************************************************************/
-
-/* idea is: hash the message and add it via xor to rndCore
- *
- * length in bits 
- * 
- * we simply first "hash" rndCore, then entropy.
- */
-void entropium_addEntropy(unsigned length_b, const void* data){
-       sha256_ctx_t s;
-       static uint8_t offset=0; /* selects if higher or lower half gets updated */
-       sha256_init(&s);
-       sha256_nextBlock(&s, rndCore);
-       while (length_b>=512){
-               sha256_nextBlock(&s, data);
-               data = (uint8_t*)data+ 512/8;
-               length_b -= 512;        
-       }
-       sha256_lastBlock(&s, data, length_b);
-       uint8_t i;
-       for (i=0; i<8; ++i){
-               rndCore[i+offset] ^= s.h[i];
-       }
-       offset ^= 8; /* hehe */
-}
-
-/*************************************************************************/
-
-void entropium_getRandomBlock(void *b){
-       sha256_ctx_t s;
-       uint8_t offset=8;
-       
-       sha256_init(&s);
-       sha256_lastBlock(&s, rndCore, 512); /* remeber the byte order! */
-       uint8_t i;
-       for (i=0; i<8; ++i){
-               rndCore[i+offset] ^= s.h[i];
-       }
-       offset ^= 8; /* hehe */
-       memcpy(b, s.h, 32); /* back up first hash in b */
-       ((uint8_t*)b)[*((uint8_t*)b)&31]++;     /* the important increment step */
-       sha256_init(&s);
-       sha256_lastBlock(&s, b, 256);
-       memcpy(b, s.h, 32);
-}
-
-/*************************************************************************/
-
-uint8_t entropium_getRandomByte(void){
-       static uint8_t block[32];
-       static uint8_t i=32;
-       
-       if (i==32){
-               entropium_getRandomBlock((void*)block);
-               i=0;
-       }       
-       return block[i++];
-}
-
-void entropium_fillBlockRandom(void* block, unsigned length_B){
-       while(length_B>ENTROPIUM_RANDOMBLOCK_SIZE){
-               entropium_getRandomBlock(block);
-               block = (uint8_t*)block + ENTROPIUM_RANDOMBLOCK_SIZE;
-               length_B -= ENTROPIUM_RANDOMBLOCK_SIZE;
-       }
-       while(length_B){
-               *((uint8_t*)block) = entropium_getRandomByte();
-               block= (uint8_t*)block +1; --length_B;
-       }
-}
- 
-