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git.ipfire.org Git - people/ms/u-boot.git/blob - common/hash.c
2 * Copyright (c) 2012 The Chromium OS Authors.
5 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
8 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 * These are the hash algorithms we support. Chips which support accelerated
36 * crypto could perhaps add named version of these algorithms here. Note that
37 * algorithm names must be in lower case.
39 static struct hash_algo hash_algo
[] = {
41 * CONFIG_SHA_HW_ACCEL is defined if hardware acceleration is
44 #ifdef CONFIG_SHA_HW_ACCEL
58 * This is CONFIG_CMD_SHA1SUM instead of CONFIG_SHA1 since otherwise
59 * it bloats the code for boards which use SHA1 but not the 'hash'
60 * or 'sha1sum' commands.
62 #ifdef CONFIG_CMD_SHA1SUM
88 #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
92 /* Try to minimize code size for boards that don't want much hashing */
94 #define multi_hash() 1
96 #define multi_hash() 0
100 * store_result: Store the resulting sum to an address or variable
102 * @algo: Hash algorithm being used
103 * @sum: Hash digest (algo->digest_size bytes)
104 * @dest: Destination, interpreted as a hex address if it starts
105 * with * (or allow_env_vars is 0) or otherwise as an
106 * environment variable.
107 * @allow_env_vars: non-zero to permit storing the result to an
108 * variable environment
110 static void store_result(struct hash_algo
*algo
, const u8
*sum
,
111 const char *dest
, int allow_env_vars
)
117 * If environment variables are allowed, then we assume that 'dest'
118 * is an environment variable, unless it starts with *, in which
119 * case we assume it is an address. If not allowed, it is always an
120 * address. This is to support the crc32 command.
122 if (allow_env_vars
) {
130 char str_output
[HASH_MAX_DIGEST_SIZE
* 2 + 1];
131 char *str_ptr
= str_output
;
133 for (i
= 0; i
< algo
->digest_size
; i
++) {
134 sprintf(str_ptr
, "%02x", sum
[i
]);
138 setenv(dest
, str_output
);
143 addr
= simple_strtoul(dest
, NULL
, 16);
144 buf
= map_sysmem(addr
, algo
->digest_size
);
145 memcpy(buf
, sum
, algo
->digest_size
);
151 * parse_verify_sum: Parse a hash verification parameter
153 * @algo: Hash algorithm being used
154 * @verify_str: Argument to parse. If it starts with * then it is
155 * interpreted as a hex address containing the hash.
156 * If the length is exactly the right number of hex digits
157 * for the digest size, then we assume it is a hex digest.
158 * Otherwise we assume it is an environment variable, and
159 * look up its value (it must contain a hex digest).
160 * @vsum: Returns binary digest value (algo->digest_size bytes)
161 * @allow_env_vars: non-zero to permit storing the result to an environment
162 * variable. If 0 then verify_str is assumed to be an
163 * address, and the * prefix is not expected.
164 * @return 0 if ok, non-zero on error
166 static int parse_verify_sum(struct hash_algo
*algo
, char *verify_str
, u8
*vsum
,
171 /* See comment above in store_result() */
172 if (allow_env_vars
) {
173 if (*verify_str
== '*')
183 addr
= simple_strtoul(verify_str
, NULL
, 16);
184 buf
= map_sysmem(addr
, algo
->digest_size
);
185 memcpy(vsum
, buf
, algo
->digest_size
);
189 int digits
= algo
->digest_size
* 2;
192 * As with the original code from sha1sum.c, we assume that a
193 * string which matches the digest size exactly is a hex
194 * string and not an environment variable.
196 if (strlen(verify_str
) == digits
)
197 vsum_str
= verify_str
;
199 vsum_str
= getenv(verify_str
);
200 if (vsum_str
== NULL
|| strlen(vsum_str
) != digits
) {
201 printf("Expected %d hex digits in env var\n",
207 for (i
= 0; i
< algo
->digest_size
; i
++) {
208 char *nullp
= vsum_str
+ (i
+ 1) * 2;
212 vsum
[i
] = simple_strtoul(vsum_str
+ (i
* 2), NULL
, 16);
219 static struct hash_algo
*find_hash_algo(const char *name
)
223 for (i
= 0; i
< ARRAY_SIZE(hash_algo
); i
++) {
224 if (!strcmp(name
, hash_algo
[i
].name
))
225 return &hash_algo
[i
];
231 static void show_hash(struct hash_algo
*algo
, ulong addr
, ulong len
,
236 printf("%s for %08lx ... %08lx ==> ", algo
->name
, addr
, addr
+ len
- 1);
237 for (i
= 0; i
< algo
->digest_size
; i
++)
238 printf("%02x", output
[i
]);
241 int hash_command(const char *algo_name
, int flags
, cmd_tbl_t
*cmdtp
, int flag
,
242 int argc
, char * const argv
[])
247 return CMD_RET_USAGE
;
249 addr
= simple_strtoul(*argv
++, NULL
, 16);
250 len
= simple_strtoul(*argv
++, NULL
, 16);
253 struct hash_algo
*algo
;
254 u8 output
[HASH_MAX_DIGEST_SIZE
];
255 u8 vsum
[HASH_MAX_DIGEST_SIZE
];
258 algo
= find_hash_algo(algo_name
);
260 printf("Unknown hash algorithm '%s'\n", algo_name
);
261 return CMD_RET_USAGE
;
265 if (algo
->digest_size
> HASH_MAX_DIGEST_SIZE
) {
266 puts("HASH_MAX_DIGEST_SIZE exceeded\n");
270 buf
= map_sysmem(addr
, len
);
271 algo
->hash_func_ws(buf
, len
, output
, algo
->chunk_size
);
274 /* Try to avoid code bloat when verify is not needed */
275 #ifdef CONFIG_HASH_VERIFY
276 if (flags
& HASH_FLAG_VERIFY
) {
281 return CMD_RET_USAGE
;
282 if (parse_verify_sum(algo
, *argv
, vsum
,
283 flags
& HASH_FLAG_ENV
)) {
284 printf("ERROR: %s does not contain a valid "
285 "%s sum\n", *argv
, algo
->name
);
288 if (memcmp(output
, vsum
, algo
->digest_size
) != 0) {
291 show_hash(algo
, addr
, len
, output
);
293 for (i
= 0; i
< algo
->digest_size
; i
++)
294 printf("%02x", vsum
[i
]);
295 puts(" ** ERROR **\n");
299 show_hash(algo
, addr
, len
, output
);
303 store_result(algo
, output
, *argv
,
304 flags
& HASH_FLAG_ENV
);
308 /* Horrible code size hack for boards that just want crc32 */
313 crc
= crc32_wd(0, (const uchar
*)addr
, len
, CHUNKSZ_CRC32
);
315 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
316 addr
, addr
+ len
- 1, crc
);
319 ptr
= (ulong
*)simple_strtoul(argv
[3], NULL
, 16);