hfal/hfal-basic.c

   1 /* hfal-basic.c */
   2 /*
   3     This file is part of the AVR-Crypto-Lib.
   4     Copyright (C) 2009  Daniel Otte (daniel.otte@rub.de)
   5
   6     This program is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <avr/pgmspace.h>
  21 #include "hashfunction_descriptor.h"
  22 #include "hfal-basic.h"
  23 #include <stdlib.h>
  24
  25 uint8_t hfal_hash_init(const hfdesc_t *hash_descriptor, hfgen_ctx_t *ctx){
  26         hf_init_fpt f;
  27         uint16_t tmp;
  28         ctx->desc_ptr = (hfdesc_t*)hash_descriptor;
  29         tmp = pgm_read_word(&(hash_descriptor->ctxsize_B));
  30         if(!(ctx->ctx=malloc(tmp)))
  31                 return 3;
  32         f= (hf_init_fpt)pgm_read_word(&(hash_descriptor->init));
  33         f(ctx->ctx);
  34         return 0;
  35 }
  36
  37 void hfal_hash_nextBlock(hfgen_ctx_t *ctx, const void *block){
  38         hf_nextBlock_fpt f;
  39         hfdesc_t *x=(ctx->desc_ptr);
  40         f =(hf_nextBlock_fpt)pgm_read_word(&(x->nextBlock));
  41         f(ctx->ctx, block);
  42 }
  43
  44 void hfal_hash_lastBlock(hfgen_ctx_t *ctx, const void *block, uint16_t length_b){
  45         hf_lastBlock_fpt f;
  46         hfdesc_t *x=ctx->desc_ptr;
  47         f =(hf_lastBlock_fpt)pgm_read_word(&(x->lastBlock));
  48         f(ctx->ctx, block, length_b);
  49 }
  50
  51 void hfal_hash_ctx2hash(void *dest, hfgen_ctx_t *ctx){
  52         hf_ctx2hash_fpt f;
  53         hfdesc_t *x=ctx->desc_ptr;
  54         f =(hf_ctx2hash_fpt)pgm_read_word(&(x->ctx2hash));
  55         f(dest, ctx->ctx);
  56 }
  57
  58 void hfal_hash_free(hfgen_ctx_t *ctx){
  59         hf_free_fpt f;
  60         hfdesc_t *x=ctx->desc_ptr;
  61         f =(hf_free_fpt)pgm_read_word(&(x->free));
  62         if(f)
  63                 f(ctx->ctx);
  64         free(ctx->ctx);
  65 }
  66
  67 void hfal_hash_mem(const hfdesc_t *hash_descriptor, void *dest, const void *msg, uint32_t length_b){
  68         void_fpt f;
  69         f = (void_fpt)pgm_read_word(&(hash_descriptor->mem));
  70         if(f){
  71                 ((hf_mem_fpt)f)(dest, msg, length_b);
  72         }else{
  73                 uint16_t bs,bsb;
  74                 uint8_t ctx[pgm_read_word(&(hash_descriptor->ctxsize_B))];
  75                 f=(void_fpt)(pgm_read_word(&(hash_descriptor->init)));
  76                 ((hf_init_fpt)f)(ctx);
  77                 bs=pgm_read_word(&(hash_descriptor->blocksize_b));
  78                 bsb=bs/8;
  79                 f=(void_fpt)(pgm_read_word(&(hash_descriptor->nextBlock)));
  80                 while(length_b>bs){
  81                         ((hf_nextBlock_fpt)f)(ctx, msg);
  82                         length_b -= bs;
  83                         msg = (uint8_t*)msg + bsb;
  84                 }
  85                 f=(void_fpt)(pgm_read_word(&(hash_descriptor->lastBlock)));
  86                 ((hf_lastBlock_fpt)f)(ctx, msg, length_b);
  87                 f=(void_fpt)(pgm_read_word(&(hash_descriptor->ctx2hash)));
  88                 ((hf_ctx2hash_fpt)f)(dest, ctx);
  89         }
  90 }
  91
  92 uint16_t hfal_hash_getBlocksize(const hfdesc_t *hash_descriptor){
  93         uint16_t ret;
  94         ret = pgm_read_word(&(hash_descriptor->blocksize_b));
  95         return ret;
  96 }
  97
  98 uint16_t hfal_hash_getHashsize(const hfdesc_t *hash_descriptor){
  99         uint16_t ret;
 100         ret = pgm_read_word(&(hash_descriptor->hashsize_b));
 101         return ret;
 102 }
 103
 104 uint16_t hfal_hash_getCtxsize_B(const hfdesc_t *hash_descriptor){
 105         uint16_t ret;
 106         ret = pgm_read_word(&(hash_descriptor->ctxsize_B));
 107         return ret;
 108 }