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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 * SPDX-License-Identifier: GPL-2.0+
18 #include <u-boot/sha1.h>
19 #include <u-boot/sha256.h>
21 #include <asm/errno.h>
23 #ifdef CONFIG_CMD_SHA1SUM
24 static int hash_init_sha1(struct hash_algo
*algo
, void **ctxp
)
26 sha1_context
*ctx
= malloc(sizeof(sha1_context
));
32 static int hash_update_sha1(struct hash_algo
*algo
, void *ctx
, const void *buf
,
33 unsigned int size
, int is_last
)
35 sha1_update((sha1_context
*)ctx
, buf
, size
);
39 static int hash_finish_sha1(struct hash_algo
*algo
, void *ctx
, void *dest_buf
,
42 if (size
< algo
->digest_size
)
45 sha1_finish((sha1_context
*)ctx
, dest_buf
);
52 static int hash_init_sha256(struct hash_algo
*algo
, void **ctxp
)
54 sha256_context
*ctx
= malloc(sizeof(sha256_context
));
60 static int hash_update_sha256(struct hash_algo
*algo
, void *ctx
,
61 const void *buf
, unsigned int size
, int is_last
)
63 sha256_update((sha256_context
*)ctx
, buf
, size
);
67 static int hash_finish_sha256(struct hash_algo
*algo
, void *ctx
, void
70 if (size
< algo
->digest_size
)
73 sha256_finish((sha256_context
*)ctx
, dest_buf
);
79 static int hash_init_crc32(struct hash_algo
*algo
, void **ctxp
)
81 uint32_t *ctx
= malloc(sizeof(uint32_t));
87 static int hash_update_crc32(struct hash_algo
*algo
, void *ctx
,
88 const void *buf
, unsigned int size
, int is_last
)
90 *((uint32_t *)ctx
) = crc32(*((uint32_t *)ctx
), buf
, size
);
94 static int hash_finish_crc32(struct hash_algo
*algo
, void *ctx
, void *dest_buf
,
97 if (size
< algo
->digest_size
)
100 *((uint32_t *)dest_buf
) = *((uint32_t *)ctx
);
106 * These are the hash algorithms we support. Chips which support accelerated
107 * crypto could perhaps add named version of these algorithms here. Note that
108 * algorithm names must be in lower case.
110 static struct hash_algo hash_algo
[] = {
112 * CONFIG_SHA_HW_ACCEL is defined if hardware acceleration is
115 #ifdef CONFIG_SHA_HW_ACCEL
129 * This is CONFIG_CMD_SHA1SUM instead of CONFIG_SHA1 since otherwise
130 * it bloats the code for boards which use SHA1 but not the 'hash'
131 * or 'sha1sum' commands.
133 #ifdef CONFIG_CMD_SHA1SUM
168 #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
172 /* Try to minimize code size for boards that don't want much hashing */
174 #define multi_hash() 1
176 #define multi_hash() 0
180 * store_result: Store the resulting sum to an address or variable
182 * @algo: Hash algorithm being used
183 * @sum: Hash digest (algo->digest_size bytes)
184 * @dest: Destination, interpreted as a hex address if it starts
185 * with * (or allow_env_vars is 0) or otherwise as an
186 * environment variable.
187 * @allow_env_vars: non-zero to permit storing the result to an
188 * variable environment
190 static void store_result(struct hash_algo
*algo
, const uint8_t *sum
,
191 const char *dest
, int allow_env_vars
)
197 * If environment variables are allowed, then we assume that 'dest'
198 * is an environment variable, unless it starts with *, in which
199 * case we assume it is an address. If not allowed, it is always an
200 * address. This is to support the crc32 command.
202 if (allow_env_vars
) {
210 char str_output
[HASH_MAX_DIGEST_SIZE
* 2 + 1];
211 char *str_ptr
= str_output
;
213 for (i
= 0; i
< algo
->digest_size
; i
++) {
214 sprintf(str_ptr
, "%02x", sum
[i
]);
218 setenv(dest
, str_output
);
223 addr
= simple_strtoul(dest
, NULL
, 16);
224 buf
= map_sysmem(addr
, algo
->digest_size
);
225 memcpy(buf
, sum
, algo
->digest_size
);
231 * parse_verify_sum: Parse a hash verification parameter
233 * @algo: Hash algorithm being used
234 * @verify_str: Argument to parse. If it starts with * then it is
235 * interpreted as a hex address containing the hash.
236 * If the length is exactly the right number of hex digits
237 * for the digest size, then we assume it is a hex digest.
238 * Otherwise we assume it is an environment variable, and
239 * look up its value (it must contain a hex digest).
240 * @vsum: Returns binary digest value (algo->digest_size bytes)
241 * @allow_env_vars: non-zero to permit storing the result to an environment
242 * variable. If 0 then verify_str is assumed to be an
243 * address, and the * prefix is not expected.
244 * @return 0 if ok, non-zero on error
246 static int parse_verify_sum(struct hash_algo
*algo
, char *verify_str
,
247 uint8_t *vsum
, int allow_env_vars
)
251 /* See comment above in store_result() */
252 if (allow_env_vars
) {
253 if (*verify_str
== '*')
263 addr
= simple_strtoul(verify_str
, NULL
, 16);
264 buf
= map_sysmem(addr
, algo
->digest_size
);
265 memcpy(vsum
, buf
, algo
->digest_size
);
269 int digits
= algo
->digest_size
* 2;
272 * As with the original code from sha1sum.c, we assume that a
273 * string which matches the digest size exactly is a hex
274 * string and not an environment variable.
276 if (strlen(verify_str
) == digits
)
277 vsum_str
= verify_str
;
279 vsum_str
= getenv(verify_str
);
280 if (vsum_str
== NULL
|| strlen(vsum_str
) != digits
) {
281 printf("Expected %d hex digits in env var\n",
287 for (i
= 0; i
< algo
->digest_size
; i
++) {
288 char *nullp
= vsum_str
+ (i
+ 1) * 2;
292 vsum
[i
] = simple_strtoul(vsum_str
+ (i
* 2), NULL
, 16);
299 int hash_lookup_algo(const char *algo_name
, struct hash_algo
**algop
)
303 for (i
= 0; i
< ARRAY_SIZE(hash_algo
); i
++) {
304 if (!strcmp(algo_name
, hash_algo
[i
].name
)) {
305 *algop
= &hash_algo
[i
];
310 debug("Unknown hash algorithm '%s'\n", algo_name
);
311 return -EPROTONOSUPPORT
;
314 void hash_show(struct hash_algo
*algo
, ulong addr
, ulong len
, uint8_t *output
)
318 printf("%s for %08lx ... %08lx ==> ", algo
->name
, addr
, addr
+ len
- 1);
319 for (i
= 0; i
< algo
->digest_size
; i
++)
320 printf("%02x", output
[i
]);
323 int hash_block(const char *algo_name
, const void *data
, unsigned int len
,
324 uint8_t *output
, int *output_size
)
326 struct hash_algo
*algo
;
329 ret
= hash_lookup_algo(algo_name
, &algo
);
333 if (output_size
&& *output_size
< algo
->digest_size
) {
334 debug("Output buffer size %d too small (need %d bytes)",
335 *output_size
, algo
->digest_size
);
339 *output_size
= algo
->digest_size
;
340 algo
->hash_func_ws(data
, len
, output
, algo
->chunk_size
);
345 int hash_command(const char *algo_name
, int flags
, cmd_tbl_t
*cmdtp
, int flag
,
346 int argc
, char * const argv
[])
351 return CMD_RET_USAGE
;
353 addr
= simple_strtoul(*argv
++, NULL
, 16);
354 len
= simple_strtoul(*argv
++, NULL
, 16);
357 struct hash_algo
*algo
;
358 uint8_t output
[HASH_MAX_DIGEST_SIZE
];
359 uint8_t vsum
[HASH_MAX_DIGEST_SIZE
];
362 if (hash_lookup_algo(algo_name
, &algo
)) {
363 printf("Unknown hash algorithm '%s'\n", algo_name
);
364 return CMD_RET_USAGE
;
368 if (algo
->digest_size
> HASH_MAX_DIGEST_SIZE
) {
369 puts("HASH_MAX_DIGEST_SIZE exceeded\n");
373 buf
= map_sysmem(addr
, len
);
374 algo
->hash_func_ws(buf
, len
, output
, algo
->chunk_size
);
377 /* Try to avoid code bloat when verify is not needed */
378 #ifdef CONFIG_HASH_VERIFY
379 if (flags
& HASH_FLAG_VERIFY
) {
384 return CMD_RET_USAGE
;
385 if (parse_verify_sum(algo
, *argv
, vsum
,
386 flags
& HASH_FLAG_ENV
)) {
387 printf("ERROR: %s does not contain a valid "
388 "%s sum\n", *argv
, algo
->name
);
391 if (memcmp(output
, vsum
, algo
->digest_size
) != 0) {
394 hash_show(algo
, addr
, len
, output
);
396 for (i
= 0; i
< algo
->digest_size
; i
++)
397 printf("%02x", vsum
[i
]);
398 puts(" ** ERROR **\n");
402 hash_show(algo
, addr
, len
, output
);
406 store_result(algo
, output
, *argv
,
407 flags
& HASH_FLAG_ENV
);
411 /* Horrible code size hack for boards that just want crc32 */
416 crc
= crc32_wd(0, (const uchar
*)addr
, len
, CHUNKSZ_CRC32
);
418 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
419 addr
, addr
+ len
- 1, crc
);
422 ptr
= (ulong
*)simple_strtoul(argv
[0], NULL
, 16);