Add hash command to perform hashing using various algorithms

This new command supports hashing SHA1 and SHA256. It could be extended
to others such as MD5 and the CRC algorithms. The syntax is modeled on
those:

   hash <algorithm> <address> <length> [*<dest_addr> | <dest_envvar>]

to calculate a hash, and:

   hash -v <algorithm> <address> <length> [*<verify_addr> | <verify_envvar>]

to verify a hash.

Use CONFIG_CMD_HASH to enable the command, CONFIG_SHA1 to enable SHA1 and
CONFIG_SHA256 to enable SHA256.

The existing sha1sum command remains.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2012-12-05 14:46:38 +00:00 committed by Tom Rini
parent e50b12c95c
commit bf36c5d521
4 changed files with 83 additions and 0 deletions

18
README
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@ -827,6 +827,7 @@ The following options need to be configured:
CONFIG_CMD_GETTIME * Get time since boot
CONFIG_CMD_GO * the 'go' command (exec code)
CONFIG_CMD_GREPENV * search environment
CONFIG_CMD_HASH * calculate hash / digest
CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
CONFIG_CMD_I2C * I2C serial bus support
CONFIG_CMD_IDE * IDE harddisk support
@ -2411,6 +2412,23 @@ CBFS (Coreboot Filesystem) support
A better solution is to properly configure the firewall,
but sometimes that is not allowed.
- Hashing support:
CONFIG_CMD_HASH
This enables a generic 'hash' command which can produce
hashes / digests from a few algorithms (e.g. SHA1, SHA256).
CONFIG_HASH_VERIFY
Enable the hash verify command (hash -v). This adds to code
size a little.
CONFIG_SHA1 - support SHA1 hashing
CONFIG_SHA256 - support SHA256 hashing
Note: There is also a sha1sum command, which should perhaps
be deprecated in favour of 'hash sha1'.
- Show boot progress:
CONFIG_SHOW_BOOT_PROGRESS

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@ -104,6 +104,7 @@ COBJS-$(CONFIG_CMD_FS_GENERIC) += cmd_fs.o
COBJS-$(CONFIG_CMD_GETTIME) += cmd_gettime.o
COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o
COBJS-$(CONFIG_CMD_HASH) += cmd_hash.o
COBJS-$(CONFIG_CMD_IDE) += cmd_ide.o
COBJS-$(CONFIG_CMD_IMMAP) += cmd_immap.o
COBJS-$(CONFIG_CMD_INI) += cmd_ini.o

63
common/cmd_hash.c Normal file
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@ -0,0 +1,63 @@
/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* (C) Copyright 2011
* Joe Hershberger, National Instruments, joe.hershberger@ni.com
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <hash.h>
static int do_hash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
#ifdef CONFIG_HASH_VERIFY
int verify = 0;
if (!strcmp(argv[1], "-v")) {
verify = 1;
argc--;
argv++;
}
#endif
/* Move forward to 'algorithm' parameter */
argc--;
argv++;
return hash_command(*argv, verify, cmdtp, flag, argc - 1, argv + 1);
}
#ifdef CONFIG_HASH_VERIFY
U_BOOT_CMD(
hash, 6, 1, do_hash,
"compute hash message digest",
"algorithm address count [[*]sum_dest]\n"
" - compute message digest [save to env var / *address]\n"
"hash -v algorithm address count [*]sum\n"
" - verify hash of memory area with env var / *address"
);
#else
U_BOOT_CMD(
hash, 5, 1, do_hash,
"compute message digest",
"algorithm address count [[*]sum_dest]\n"
" - compute message digest [save to env var / *address]"
);
#endif

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@ -41,6 +41,7 @@
#define CONFIG_CMD_FLASH /* flinfo, erase, protect */
#define CONFIG_CMD_FPGA /* FPGA configuration Support */
#define CONFIG_CMD_GETTIME /* Get time since boot */
#define CONFIG_CMD_HASH /* calculate hash / digest */
#define CONFIG_CMD_HWFLOW /* RTS/CTS hw flow control */
#define CONFIG_CMD_I2C /* I2C serial bus support */
#define CONFIG_CMD_IDE /* IDE harddisk support */