include/hash.h

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  * See file CREDITS for list of people who contributed to this
   4  * project.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (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, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 #ifndef _HASH_H
  23 #define _HASH_H
  24
  25 #ifdef CONFIG_SHA1SUM_VERIFY
  26 #define CONFIG_HASH_VERIFY
  27 #endif
  28
  29 struct hash_algo {
  30         const char *name;                       /* Name of algorithm */
  31         int digest_size;                        /* Length of digest */
  32         /**
  33          * hash_func_ws: Generic hashing function
  34          *
  35          * This is the generic prototype for a hashing function. We only
  36          * have the watchdog version at present.
  37          *
  38          * @input:      Input buffer
  39          * @ilen:       Input buffer length
  40          * @output:     Checksum result (length depends on algorithm)
  41          * @chunk_sz:   Trigger watchdog after processing this many bytes
  42          */
  43         void (*hash_func_ws)(const unsigned char *input, unsigned int ilen,
  44                 unsigned char *output, unsigned int chunk_sz);
  45         int chunk_size;                         /* Watchdog chunk size */
  46 };
  47
  48 /*
  49  * Maximum digest size for all algorithms we support. Having this value
  50  * avoids a malloc() or C99 local declaration in common/cmd_hash.c.
  51  */
  52 #define HASH_MAX_DIGEST_SIZE    32
  53
  54 /**
  55  * hash_command: Process a hash command for a particular algorithm
  56  *
  57  * This common function is used to implement specific hash commands.
  58  *
  59  * @algo_name:          Hash algorithm being used
  60  * @verify:             Non-zero to enable verify mode
  61  * @cmdtp:              Pointer to command table entry
  62  * @flag:               Some flags normally 0 (see CMD_FLAG_.. above)
  63  * @argc:               Number of arguments (arg 0 must be the command text)
  64  * @argv:               Arguments
  65  */
  66 int hash_command(const char *algo_name, int verify, cmd_tbl_t *cmdtp, int flag,
  67                  int argc, char * const argv[]);
  68
  69 #endif