common/hash.c

   1 /*
   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  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #ifndef USE_HOSTCC
  14 #include <common.h>
  15 #include <command.h>
  16 #include <malloc.h>
  17 #include <mapmem.h>
  18 #include <hw_sha.h>
  19 #include <asm/io.h>
  20 #include <asm/errno.h>
  21 #else
  22 #include "mkimage.h"
  23 #include <time.h>
  24 #include <image.h>
  25 #endif /* !USE_HOSTCC*/
  26
  27 #include <hash.h>
  28 #include <u-boot/crc.h>
  29 #include <u-boot/sha1.h>
  30 #include <u-boot/sha256.h>
  31 #include <u-boot/md5.h>
  32
  33 #ifdef CONFIG_SHA1
  34 static int hash_init_sha1(struct hash_algo *algo, void **ctxp)
  35 {
  36         sha1_context *ctx = malloc(sizeof(sha1_context));
  37         sha1_starts(ctx);
  38         *ctxp = ctx;
  39         return 0;
  40 }
  41
  42 static int hash_update_sha1(struct hash_algo *algo, void *ctx, const void *buf,
  43                             unsigned int size, int is_last)
  44 {
  45         sha1_update((sha1_context *)ctx, buf, size);
  46         return 0;
  47 }
  48
  49 static int hash_finish_sha1(struct hash_algo *algo, void *ctx, void *dest_buf,
  50                             int size)
  51 {
  52         if (size < algo->digest_size)
  53                 return -1;
  54
  55         sha1_finish((sha1_context *)ctx, dest_buf);
  56         free(ctx);
  57         return 0;
  58 }
  59 #endif
  60
  61 #ifdef CONFIG_SHA256
  62 static int hash_init_sha256(struct hash_algo *algo, void **ctxp)
  63 {
  64         sha256_context *ctx = malloc(sizeof(sha256_context));
  65         sha256_starts(ctx);
  66         *ctxp = ctx;
  67         return 0;
  68 }
  69
  70 static int hash_update_sha256(struct hash_algo *algo, void *ctx,
  71                               const void *buf, unsigned int size, int is_last)
  72 {
  73         sha256_update((sha256_context *)ctx, buf, size);
  74         return 0;
  75 }
  76
  77 static int hash_finish_sha256(struct hash_algo *algo, void *ctx, void
  78                               *dest_buf, int size)
  79 {
  80         if (size < algo->digest_size)
  81                 return -1;
  82
  83         sha256_finish((sha256_context *)ctx, dest_buf);
  84         free(ctx);
  85         return 0;
  86 }
  87 #endif
  88
  89 static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
  90 {
  91         uint32_t *ctx = malloc(sizeof(uint32_t));
  92         *ctx = 0;
  93         *ctxp = ctx;
  94         return 0;
  95 }
  96
  97 static int hash_update_crc32(struct hash_algo *algo, void *ctx,
  98                              const void *buf, unsigned int size, int is_last)
  99 {
 100         *((uint32_t *)ctx) = crc32(*((uint32_t *)ctx), buf, size);
 101         return 0;
 102 }
 103
 104 static int hash_finish_crc32(struct hash_algo *algo, void *ctx, void *dest_buf,
 105                              int size)
 106 {
 107         if (size < algo->digest_size)
 108                 return -1;
 109
 110         *((uint32_t *)dest_buf) = *((uint32_t *)ctx);
 111         free(ctx);
 112         return 0;
 113 }
 114
 115 /*
 116  * These are the hash algorithms we support. Chips which support accelerated
 117  * crypto could perhaps add named version of these algorithms here. Note that
 118  * algorithm names must be in lower case.
 119  */
 120 static struct hash_algo hash_algo[] = {
 121         /*
 122          * CONFIG_SHA_HW_ACCEL is defined if hardware acceleration is
 123          * available.
 124          */
 125 #ifdef CONFIG_SHA_HW_ACCEL
 126         {
 127                 "sha1",
 128                 SHA1_SUM_LEN,
 129                 hw_sha1,
 130                 CHUNKSZ_SHA1,
 131 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 132                 hw_sha_init,
 133                 hw_sha_update,
 134                 hw_sha_finish,
 135 #endif
 136         }, {
 137                 "sha256",
 138                 SHA256_SUM_LEN,
 139                 hw_sha256,
 140                 CHUNKSZ_SHA256,
 141 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 142                 hw_sha_init,
 143                 hw_sha_update,
 144                 hw_sha_finish,
 145 #endif
 146         },
 147 #endif
 148 #ifdef CONFIG_SHA1
 149         {
 150                 "sha1",
 151                 SHA1_SUM_LEN,
 152                 sha1_csum_wd,
 153                 CHUNKSZ_SHA1,
 154                 hash_init_sha1,
 155                 hash_update_sha1,
 156                 hash_finish_sha1,
 157         },
 158 #endif
 159 #ifdef CONFIG_SHA256
 160         {
 161                 "sha256",
 162                 SHA256_SUM_LEN,
 163                 sha256_csum_wd,
 164                 CHUNKSZ_SHA256,
 165                 hash_init_sha256,
 166                 hash_update_sha256,
 167                 hash_finish_sha256,
 168         },
 169 #endif
 170         {
 171                 "crc32",
 172                 4,
 173                 crc32_wd_buf,
 174                 CHUNKSZ_CRC32,
 175                 hash_init_crc32,
 176                 hash_update_crc32,
 177                 hash_finish_crc32,
 178         },
 179 };
 180
 181 #if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM)
 182 #define MULTI_HASH
 183 #endif
 184
 185 #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
 186 #define MULTI_HASH
 187 #endif
 188
 189 /* Try to minimize code size for boards that don't want much hashing */
 190 #ifdef MULTI_HASH
 191 #define multi_hash()    1
 192 #else
 193 #define multi_hash()    0
 194 #endif
 195
 196 int hash_lookup_algo(const char *algo_name, struct hash_algo **algop)
 197 {
 198         int i;
 199
 200         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 201                 if (!strcmp(algo_name, hash_algo[i].name)) {
 202                         *algop = &hash_algo[i];
 203                         return 0;
 204                 }
 205         }
 206
 207         debug("Unknown hash algorithm '%s'\n", algo_name);
 208         return -EPROTONOSUPPORT;
 209 }
 210
 211 int hash_progressive_lookup_algo(const char *algo_name,
 212                                  struct hash_algo **algop)
 213 {
 214         int i;
 215
 216         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 217                 if (!strcmp(algo_name, hash_algo[i].name)) {
 218                         if (hash_algo[i].hash_init) {
 219                                 *algop = &hash_algo[i];
 220                                 return 0;
 221                         }
 222                 }
 223         }
 224
 225         debug("Unknown hash algorithm '%s'\n", algo_name);
 226         return -EPROTONOSUPPORT;
 227 }
 228
 229 #ifndef USE_HOSTCC
 230 /**
 231  * store_result: Store the resulting sum to an address or variable
 232  *
 233  * @algo:               Hash algorithm being used
 234  * @sum:                Hash digest (algo->digest_size bytes)
 235  * @dest:               Destination, interpreted as a hex address if it starts
 236  *                      with * (or allow_env_vars is 0) or otherwise as an
 237  *                      environment variable.
 238  * @allow_env_vars:     non-zero to permit storing the result to an
 239  *                      variable environment
 240  */
 241 static void store_result(struct hash_algo *algo, const uint8_t *sum,
 242                          const char *dest, int allow_env_vars)
 243 {
 244         unsigned int i;
 245         int env_var = 0;
 246
 247         /*
 248          * If environment variables are allowed, then we assume that 'dest'
 249          * is an environment variable, unless it starts with *, in which
 250          * case we assume it is an address. If not allowed, it is always an
 251          * address. This is to support the crc32 command.
 252          */
 253         if (allow_env_vars) {
 254                 if (*dest == '*')
 255                         dest++;
 256                 else
 257                         env_var = 1;
 258         }
 259
 260         if (env_var) {
 261                 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
 262                 char *str_ptr = str_output;
 263
 264                 for (i = 0; i < algo->digest_size; i++) {
 265                         sprintf(str_ptr, "%02x", sum[i]);
 266                         str_ptr += 2;
 267                 }
 268                 *str_ptr = '\0';
 269                 setenv(dest, str_output);
 270         } else {
 271                 ulong addr;
 272                 void *buf;
 273
 274                 addr = simple_strtoul(dest, NULL, 16);
 275                 buf = map_sysmem(addr, algo->digest_size);
 276                 memcpy(buf, sum, algo->digest_size);
 277                 unmap_sysmem(buf);
 278         }
 279 }
 280
 281 /**
 282  * parse_verify_sum: Parse a hash verification parameter
 283  *
 284  * @algo:               Hash algorithm being used
 285  * @verify_str:         Argument to parse. If it starts with * then it is
 286  *                      interpreted as a hex address containing the hash.
 287  *                      If the length is exactly the right number of hex digits
 288  *                      for the digest size, then we assume it is a hex digest.
 289  *                      Otherwise we assume it is an environment variable, and
 290  *                      look up its value (it must contain a hex digest).
 291  * @vsum:               Returns binary digest value (algo->digest_size bytes)
 292  * @allow_env_vars:     non-zero to permit storing the result to an environment
 293  *                      variable. If 0 then verify_str is assumed to be an
 294  *                      address, and the * prefix is not expected.
 295  * @return 0 if ok, non-zero on error
 296  */
 297 static int parse_verify_sum(struct hash_algo *algo, char *verify_str,
 298                             uint8_t *vsum, int allow_env_vars)
 299 {
 300         int env_var = 0;
 301
 302         /* See comment above in store_result() */
 303         if (allow_env_vars) {
 304                 if (*verify_str == '*')
 305                         verify_str++;
 306                 else
 307                         env_var = 1;
 308         }
 309
 310         if (!env_var) {
 311                 ulong addr;
 312                 void *buf;
 313
 314                 addr = simple_strtoul(verify_str, NULL, 16);
 315                 buf = map_sysmem(addr, algo->digest_size);
 316                 memcpy(vsum, buf, algo->digest_size);
 317         } else {
 318                 unsigned int i;
 319                 char *vsum_str;
 320                 int digits = algo->digest_size * 2;
 321
 322                 /*
 323                  * As with the original code from sha1sum.c, we assume that a
 324                  * string which matches the digest size exactly is a hex
 325                  * string and not an environment variable.
 326                  */
 327                 if (strlen(verify_str) == digits)
 328                         vsum_str = verify_str;
 329                 else {
 330                         vsum_str = getenv(verify_str);
 331                         if (vsum_str == NULL || strlen(vsum_str) != digits) {
 332                                 printf("Expected %d hex digits in env var\n",
 333                                        digits);
 334                                 return 1;
 335                         }
 336                 }
 337
 338                 for (i = 0; i < algo->digest_size; i++) {
 339                         char *nullp = vsum_str + (i + 1) * 2;
 340                         char end = *nullp;
 341
 342                         *nullp = '\0';
 343                         vsum[i] = simple_strtoul(vsum_str + (i * 2), NULL, 16);
 344                         *nullp = end;
 345                 }
 346         }
 347         return 0;
 348 }
 349
 350 void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t *output)
 351 {
 352         int i;
 353
 354         printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
 355         for (i = 0; i < algo->digest_size; i++)
 356                 printf("%02x", output[i]);
 357 }
 358
 359 int hash_block(const char *algo_name, const void *data, unsigned int len,
 360                uint8_t *output, int *output_size)
 361 {
 362         struct hash_algo *algo;
 363         int ret;
 364
 365         ret = hash_lookup_algo(algo_name, &algo);
 366         if (ret)
 367                 return ret;
 368
 369         if (output_size && *output_size < algo->digest_size) {
 370                 debug("Output buffer size %d too small (need %d bytes)",
 371                       *output_size, algo->digest_size);
 372                 return -ENOSPC;
 373         }
 374         if (output_size)
 375                 *output_size = algo->digest_size;
 376         algo->hash_func_ws(data, len, output, algo->chunk_size);
 377
 378         return 0;
 379 }
 380
 381 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
 382                  int argc, char * const argv[])
 383 {
 384         ulong addr, len;
 385
 386         if ((argc < 2) || ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
 387                 return CMD_RET_USAGE;
 388
 389         addr = simple_strtoul(*argv++, NULL, 16);
 390         len = simple_strtoul(*argv++, NULL, 16);
 391
 392         if (multi_hash()) {
 393                 struct hash_algo *algo;
 394                 uint8_t output[HASH_MAX_DIGEST_SIZE];
 395                 uint8_t vsum[HASH_MAX_DIGEST_SIZE];
 396                 void *buf;
 397
 398                 if (hash_lookup_algo(algo_name, &algo)) {
 399                         printf("Unknown hash algorithm '%s'\n", algo_name);
 400                         return CMD_RET_USAGE;
 401                 }
 402                 argc -= 2;
 403
 404                 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
 405                         puts("HASH_MAX_DIGEST_SIZE exceeded\n");
 406                         return 1;
 407                 }
 408
 409                 buf = map_sysmem(addr, len);
 410                 algo->hash_func_ws(buf, len, output, algo->chunk_size);
 411                 unmap_sysmem(buf);
 412
 413                 /* Try to avoid code bloat when verify is not needed */
 414 #ifdef CONFIG_HASH_VERIFY
 415                 if (flags & HASH_FLAG_VERIFY) {
 416 #else
 417                 if (0) {
 418 #endif
 419                         if (parse_verify_sum(algo, *argv, vsum,
 420                                         flags & HASH_FLAG_ENV)) {
 421                                 printf("ERROR: %s does not contain a valid "
 422                                         "%s sum\n", *argv, algo->name);
 423                                 return 1;
 424                         }
 425                         if (memcmp(output, vsum, algo->digest_size) != 0) {
 426                                 int i;
 427
 428                                 hash_show(algo, addr, len, output);
 429                                 printf(" != ");
 430                                 for (i = 0; i < algo->digest_size; i++)
 431                                         printf("%02x", vsum[i]);
 432                                 puts(" ** ERROR **\n");
 433                                 return 1;
 434                         }
 435                 } else {
 436                         hash_show(algo, addr, len, output);
 437                         printf("\n");
 438
 439                         if (argc) {
 440                                 store_result(algo, output, *argv,
 441                                         flags & HASH_FLAG_ENV);
 442                         }
 443                 }
 444
 445         /* Horrible code size hack for boards that just want crc32 */
 446         } else {
 447                 ulong crc;
 448                 ulong *ptr;
 449
 450                 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
 451
 452                 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
 453                                 addr, addr + len - 1, crc);
 454
 455                 if (argc >= 3) {
 456                         ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
 457                         *ptr = crc;
 458                 }
 459         }
 460
 461         return 0;
 462 }
 463 #endif