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,
33 * These are the hash algorithms we support. Chips which support accelerated
34 * crypto could perhaps add named version of these algorithms here.
36 static struct hash_algo hash_algo[] = {
38 * This is CONFIG_CMD_SHA1SUM instead of CONFIG_SHA1 since otherwise
39 * it bloats the code for boards which use SHA1 but not the 'hash'
40 * or 'sha1sum' commands.
42 #ifdef CONFIG_CMD_SHA1SUM
68 #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
72 /* Try to minimize code size for boards that don't want much hashing */
74 #define multi_hash() 1
76 #define multi_hash() 0
80 * store_result: Store the resulting sum to an address or variable
82 * @algo: Hash algorithm being used
83 * @sum: Hash digest (algo->digest_size bytes)
84 * @dest: Destination, interpreted as a hex address if it starts
85 * with * (or allow_env_vars is 0) or otherwise as an
86 * environment variable.
87 * @allow_env_vars: non-zero to permit storing the result to an
88 * variable environment
90 static void store_result(struct hash_algo *algo, const u8 *sum,
91 const char *dest, int allow_env_vars)
97 * If environment variables are allowed, then we assume that 'dest'
98 * is an environment variable, unless it starts with *, in which
99 * case we assume it is an address. If not allowed, it is always an
100 * address. This is to support the crc32 command.
102 if (allow_env_vars) {
110 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
111 char *str_ptr = str_output;
113 for (i = 0; i < algo->digest_size; i++) {
114 sprintf(str_ptr, "%02x", sum[i]);
118 setenv(dest, str_output);
122 ptr = (u8 *)simple_strtoul(dest, NULL, 16);
123 memcpy(ptr, sum, algo->digest_size);
128 * parse_verify_sum: Parse a hash verification parameter
130 * @algo: Hash algorithm being used
131 * @verify_str: Argument to parse. If it starts with * then it is
132 * interpreted as a hex address containing the hash.
133 * If the length is exactly the right number of hex digits
134 * for the digest size, then we assume it is a hex digest.
135 * Otherwise we assume it is an environment variable, and
136 * look up its value (it must contain a hex digest).
137 * @vsum: Returns binary digest value (algo->digest_size bytes)
138 * @allow_env_vars: non-zero to permit storing the result to an environment
139 * variable. If 0 then verify_str is assumed to be an
140 * address, and the * prefix is not expected.
141 * @return 0 if ok, non-zero on error
143 static int parse_verify_sum(struct hash_algo *algo, char *verify_str, u8 *vsum,
148 /* See comment above in store_result() */
149 if (allow_env_vars) {
150 if (*verify_str == '*')
159 ptr = (u8 *)simple_strtoul(verify_str, NULL, 16);
160 memcpy(vsum, ptr, algo->digest_size);
164 int digits = algo->digest_size * 2;
167 * As with the original code from sha1sum.c, we assume that a
168 * string which matches the digest size exactly is a hex
169 * string and not an environment variable.
171 if (strlen(verify_str) == digits)
172 vsum_str = verify_str;
174 vsum_str = getenv(verify_str);
175 if (vsum_str == NULL || strlen(vsum_str) != digits) {
176 printf("Expected %d hex digits in env var\n",
182 for (i = 0; i < algo->digest_size; i++) {
183 char *nullp = vsum_str + (i + 1) * 2;
187 vsum[i] = simple_strtoul(vsum_str + (i * 2), NULL, 16);
194 static struct hash_algo *find_hash_algo(const char *name)
198 for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
199 if (!strcasecmp(name, hash_algo[i].name))
200 return &hash_algo[i];
206 static void show_hash(struct hash_algo *algo, ulong addr, ulong len,
211 printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
212 for (i = 0; i < algo->digest_size; i++)
213 printf("%02x", output[i]);
216 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
217 int argc, char * const argv[])
222 return CMD_RET_USAGE;
224 addr = simple_strtoul(*argv++, NULL, 16);
225 len = simple_strtoul(*argv++, NULL, 16);
228 struct hash_algo *algo;
229 u8 output[HASH_MAX_DIGEST_SIZE];
230 u8 vsum[HASH_MAX_DIGEST_SIZE];
232 algo = find_hash_algo(algo_name);
234 printf("Unknown hash algorithm '%s'\n", algo_name);
235 return CMD_RET_USAGE;
239 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
240 puts("HASH_MAX_DIGEST_SIZE exceeded\n");
244 algo->hash_func_ws((const unsigned char *)addr, len, output,
247 /* Try to avoid code bloat when verify is not needed */
248 #ifdef CONFIG_HASH_VERIFY
249 if (flags & HASH_FLAG_VERIFY) {
254 return CMD_RET_USAGE;
255 if (parse_verify_sum(algo, *argv, vsum,
256 flags & HASH_FLAG_ENV)) {
257 printf("ERROR: %s does not contain a valid "
258 "%s sum\n", *argv, algo->name);
261 if (memcmp(output, vsum, algo->digest_size) != 0) {
264 show_hash(algo, addr, len, output);
266 for (i = 0; i < algo->digest_size; i++)
267 printf("%02x", vsum[i]);
268 puts(" ** ERROR **\n");
272 show_hash(algo, addr, len, output);
276 store_result(algo, output, *argv,
277 flags & HASH_FLAG_ENV);
281 /* Horrible code size hack for boards that just want crc32 */
286 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
288 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
289 addr, addr + len - 1, crc);
292 ptr = (ulong *)simple_strtoul(argv[3], NULL, 16);