modified structure

[avr-crypto-lib.git] / rc5.c

diff --git a/rc5.c b/rc5.c
deleted file mode 100644 (file)
index 441f61d..0000000
--- a/rc5.c
+++ /dev/null
@@ -1,98 +0,0 @@
-/* rc5.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/>.
-*/
-/* rc5.c a C implementation of RC5 for AVR microcontrollers
- * 
- * author: Daniel Otte 
- * email:  daniel.otte@rub.de
- * license: GPLv3
- * 
- * this implementation is limited to 64bit blocks and a maximum of 255 rounds
- * 
- */
-
-#include <stdint.h>
-#include <stdlib.h> /* malloc() & free() */
-#include <string.h> /* memset() & memcpy() */
-#include "rc5.h" 
- 
-
-#define A (((uint32_t*)buffer)[0])
-#define B (((uint32_t*)buffer)[1])
-#define ROTL32(v,n) (((v)<<(n))|((v)>>(32-(n))))
-#define ROTR32(v,n) (((v)>>(n))|((v)<<(32-(n))))
-
-void rc5_enc(void* buffer, const rc5_ctx_t* ctx){
-       uint8_t i;
-       A += ctx->s[0];
-       B += ctx->s[1];
-       for(i=0; i<ctx->rounds; ++i){
-               A = ROTL32(A^B, B&31) + ctx->s[(i+1)*2+0];
-               B = ROTL32(A^B, A&31) + ctx->s[(i+1)*2+1];
-       } 
-}
-
-void rc5_dec(void* buffer, const rc5_ctx_t* ctx){
-       uint8_t i;
-       for(i=ctx->rounds; i>0; --i){
-               B = ROTR32(B - ctx->s[i*2+1], A&31) ^ A;
-               A = ROTR32(A - ctx->s[i*2+0], B&31) ^ B;
-       } 
-       B -= ctx->s[1];
-       A -= ctx->s[0];
-}
-/*
-P32 = 10110111111000010101000101100011 = b7e15163
-Q32 = 10011110001101110111100110111001 = 9e3779b9
-*/
-#define P32 0xb7e15163
-#define Q32 0x9e3779b9
-
-
-void rc5_init(void* key, uint16_t keysize_b, uint8_t rounds, rc5_ctx_t* ctx){
-       uint16_t c,n,m,j,i,t;
-       uint32_t a,b,l[(keysize_b+31)/32];
-       ctx->rounds = rounds;
-       t=2*(rounds+1);
-       c=(keysize_b+31)/32;
-       ctx->s = malloc(t*sizeof(uint32_t));
-       
-       memset(l, 0, sizeof(uint32_t)*c);
-       memcpy(l, key, (keysize_b+7)/8);
-       
-       ctx->s[0] = P32;
-       for(i=1; i<t; ++i){
-               ctx->s[i] = ctx->s[i-1] + Q32;
-       }
-       
-       m = ((t>c)?t:c)*3;
-       i=j=0;
-       a=b=0;
-       for(n=0; n<m; ++n){
-               a=ctx->s[i]=ROTL32(ctx->s[i]+a+b, 3);
-               b=l[j]=ROTL32(l[j]+a+b, (a+b)&31);
-               i=(i+1)%t;
-               j=(j+1)%c;
-       }
-}
-
-void rc5_free(rc5_ctx_t* ctx){
-       if(ctx->s)
-               free(ctx->s);
-}
-