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Simon Glass460408e2012-12-05 14:46:36 +00001/*
2 * Copyright (c) 2012 The Chromium OS Authors.
3 *
4 * (C) Copyright 2011
5 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
6 *
7 * (C) Copyright 2000
8 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 *
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.
14 *
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.
19 *
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,
23 * MA 02111-1307 USA
24 */
25
26#include <common.h>
27#include <command.h>
28#include <hash.h>
29#include <sha1.h>
30#include <sha256.h>
31
32/*
33 * These are the hash algorithms we support. Chips which support accelerated
34 * crypto could perhaps add named version of these algorithms here.
35 */
36static struct hash_algo hash_algo[] = {
Simon Glassd20a40d2013-02-24 20:30:22 +000037 /*
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.
41 */
42#ifdef CONFIG_CMD_SHA1SUM
Simon Glass460408e2012-12-05 14:46:36 +000043 {
44 "SHA1",
45 SHA1_SUM_LEN,
46 sha1_csum_wd,
47 CHUNKSZ_SHA1,
48 },
Simon Glassd20a40d2013-02-24 20:30:22 +000049#define MULTI_HASH
Simon Glass460408e2012-12-05 14:46:36 +000050#endif
51#ifdef CONFIG_SHA256
52 {
53 "SHA256",
54 SHA256_SUM_LEN,
55 sha256_csum_wd,
56 CHUNKSZ_SHA256,
57 },
Simon Glassd20a40d2013-02-24 20:30:22 +000058#define MULTI_HASH
Simon Glass460408e2012-12-05 14:46:36 +000059#endif
Simon Glassd20a40d2013-02-24 20:30:22 +000060 {
61 "CRC32",
62 4,
63 crc32_wd_buf,
64 CHUNKSZ_CRC32,
65 },
Simon Glass460408e2012-12-05 14:46:36 +000066};
67
Simon Glassd20a40d2013-02-24 20:30:22 +000068#if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
69#define MULTI_HASH
70#endif
71
72/* Try to minimize code size for boards that don't want much hashing */
73#ifdef MULTI_HASH
74#define multi_hash() 1
75#else
76#define multi_hash() 0
77#endif
78
Simon Glass460408e2012-12-05 14:46:36 +000079/**
80 * store_result: Store the resulting sum to an address or variable
81 *
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
Simon Glassd5b76672013-02-24 17:33:26 +000085 * 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
Simon Glass460408e2012-12-05 14:46:36 +000089 */
90static void store_result(struct hash_algo *algo, const u8 *sum,
Simon Glassd5b76672013-02-24 17:33:26 +000091 const char *dest, int allow_env_vars)
Simon Glass460408e2012-12-05 14:46:36 +000092{
93 unsigned int i;
Simon Glassd5b76672013-02-24 17:33:26 +000094 int env_var = 0;
Simon Glass460408e2012-12-05 14:46:36 +000095
Simon Glassd5b76672013-02-24 17:33:26 +000096 /*
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.
101 */
102 if (allow_env_vars) {
103 if (*dest == '*')
104 dest++;
105 else
106 env_var = 1;
107 }
Simon Glass460408e2012-12-05 14:46:36 +0000108
Simon Glassd5b76672013-02-24 17:33:26 +0000109 if (env_var) {
Simon Glass460408e2012-12-05 14:46:36 +0000110 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
111 char *str_ptr = str_output;
112
113 for (i = 0; i < algo->digest_size; i++) {
114 sprintf(str_ptr, "%02x", sum[i]);
115 str_ptr += 2;
116 }
117 str_ptr = '\0';
118 setenv(dest, str_output);
Simon Glassd5b76672013-02-24 17:33:26 +0000119 } else {
120 u8 *ptr;
121
122 ptr = (u8 *)simple_strtoul(dest, NULL, 16);
123 memcpy(ptr, sum, algo->digest_size);
Simon Glass460408e2012-12-05 14:46:36 +0000124 }
125}
126
127/**
128 * parse_verify_sum: Parse a hash verification parameter
129 *
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)
Simon Glassd5b76672013-02-24 17:33:26 +0000138 * @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.
Simon Glass460408e2012-12-05 14:46:36 +0000141 * @return 0 if ok, non-zero on error
142 */
Simon Glassd5b76672013-02-24 17:33:26 +0000143static int parse_verify_sum(struct hash_algo *algo, char *verify_str, u8 *vsum,
144 int allow_env_vars)
Simon Glass460408e2012-12-05 14:46:36 +0000145{
Simon Glassd5b76672013-02-24 17:33:26 +0000146 int env_var = 0;
147
148 /* See comment above in store_result() */
149 if (allow_env_vars) {
150 if (*verify_str == '*')
151 verify_str++;
152 else
153 env_var = 1;
154 }
155
156 if (env_var) {
Simon Glass460408e2012-12-05 14:46:36 +0000157 u8 *ptr;
158
Simon Glassd5b76672013-02-24 17:33:26 +0000159 ptr = (u8 *)simple_strtoul(verify_str, NULL, 16);
Simon Glass460408e2012-12-05 14:46:36 +0000160 memcpy(vsum, ptr, algo->digest_size);
161 } else {
162 unsigned int i;
163 char *vsum_str;
164 int digits = algo->digest_size * 2;
165
166 /*
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.
170 */
171 if (strlen(verify_str) == digits)
172 vsum_str = verify_str;
173 else {
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",
177 digits);
178 return 1;
179 }
180 }
181
182 for (i = 0; i < algo->digest_size; i++) {
183 char *nullp = vsum_str + (i + 1) * 2;
184 char end = *nullp;
185
186 *nullp = '\0';
187 vsum[i] = simple_strtoul(vsum_str + (i * 2), NULL, 16);
188 *nullp = end;
189 }
190 }
191 return 0;
192}
193
194static struct hash_algo *find_hash_algo(const char *name)
195{
196 int i;
197
198 for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
199 if (!strcasecmp(name, hash_algo[i].name))
200 return &hash_algo[i];
201 }
202
203 return NULL;
204}
205
206static void show_hash(struct hash_algo *algo, ulong addr, ulong len,
207 u8 *output)
208{
209 int i;
210
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]);
214}
215
Simon Glassd5b76672013-02-24 17:33:26 +0000216int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
Simon Glass460408e2012-12-05 14:46:36 +0000217 int argc, char * const argv[])
218{
Simon Glass460408e2012-12-05 14:46:36 +0000219 ulong addr, len;
Simon Glass460408e2012-12-05 14:46:36 +0000220
221 if (argc < 2)
222 return CMD_RET_USAGE;
223
Simon Glassd5b76672013-02-24 17:33:26 +0000224 addr = simple_strtoul(*argv++, NULL, 16);
225 len = simple_strtoul(*argv++, NULL, 16);
226
Simon Glassd20a40d2013-02-24 20:30:22 +0000227 if (multi_hash()) {
228 struct hash_algo *algo;
229 u8 output[HASH_MAX_DIGEST_SIZE];
230 u8 vsum[HASH_MAX_DIGEST_SIZE];
Simon Glass460408e2012-12-05 14:46:36 +0000231
Simon Glassd20a40d2013-02-24 20:30:22 +0000232 algo = find_hash_algo(algo_name);
233 if (!algo) {
234 printf("Unknown hash algorithm '%s'\n", algo_name);
Simon Glass460408e2012-12-05 14:46:36 +0000235 return CMD_RET_USAGE;
Simon Glassd20a40d2013-02-24 20:30:22 +0000236 }
237 argc -= 2;
238
239 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
240 puts("HASH_MAX_DIGEST_SIZE exceeded\n");
241 return 1;
242 }
243
244 algo->hash_func_ws((const unsigned char *)addr, len, output,
245 algo->chunk_size);
246
247 /* Try to avoid code bloat when verify is not needed */
248#ifdef CONFIG_HASH_VERIFY
249 if (flags & HASH_FLAG_VERIFY) {
250#else
251 if (0) {
252#endif
253 if (!argc)
254 return CMD_RET_USAGE;
255 if (parse_verify_sum(algo, *argv, vsum,
Simon Glassd5b76672013-02-24 17:33:26 +0000256 flags & HASH_FLAG_ENV)) {
Simon Glassd20a40d2013-02-24 20:30:22 +0000257 printf("ERROR: %s does not contain a valid "
258 "%s sum\n", *argv, algo->name);
259 return 1;
260 }
261 if (memcmp(output, vsum, algo->digest_size) != 0) {
262 int i;
Simon Glass460408e2012-12-05 14:46:36 +0000263
Simon Glassd20a40d2013-02-24 20:30:22 +0000264 show_hash(algo, addr, len, output);
265 printf(" != ");
266 for (i = 0; i < algo->digest_size; i++)
267 printf("%02x", vsum[i]);
268 puts(" ** ERROR **\n");
269 return 1;
270 }
271 } else {
Simon Glass460408e2012-12-05 14:46:36 +0000272 show_hash(algo, addr, len, output);
Simon Glassd20a40d2013-02-24 20:30:22 +0000273 printf("\n");
Simon Glass460408e2012-12-05 14:46:36 +0000274
Simon Glassd20a40d2013-02-24 20:30:22 +0000275 if (argc) {
276 store_result(algo, output, *argv,
277 flags & HASH_FLAG_ENV);
278 }
279 }
280
281 /* Horrible code size hack for boards that just want crc32 */
282 } else {
283 ulong crc;
284 ulong *ptr;
285
286 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
287
288 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
289 addr, addr + len - 1, crc);
290
291 if (argc > 3) {
292 ptr = (ulong *)simple_strtoul(argv[3], NULL, 16);
293 *ptr = crc;
Simon Glassd5b76672013-02-24 17:33:26 +0000294 }
Simon Glass460408e2012-12-05 14:46:36 +0000295 }
296
297 return 0;
298}