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 <linux/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 #if defined(CONFIG_SHA1) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
  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 #if defined(CONFIG_SHA256) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
  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.  If we have hardware acceleration
 117  * is enable we will use that, otherwise a software version of the algorithm.
 118  * Note that algorithm names must be in lower case.
 119  */
 120 static struct hash_algo hash_algo[] = {
 121 #ifdef CONFIG_SHA1
 122         {
 123                 .name           = "sha1",
 124                 .digest_size    = SHA1_SUM_LEN,
 125                 .chunk_size     = CHUNKSZ_SHA1,
 126 #ifdef CONFIG_SHA_HW_ACCEL
 127                 .hash_func_ws   = hw_sha1,
 128 #else
 129                 .hash_func_ws   = sha1_csum_wd,
 130 #endif
 131 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 132                 .hash_init      = hw_sha_init,
 133                 .hash_update    = hw_sha_update,
 134                 .hash_finish    = hw_sha_finish,
 135 #else
 136                 .hash_init      = hash_init_sha1,
 137                 .hash_update    = hash_update_sha1,
 138                 .hash_finish    = hash_finish_sha1,
 139 #endif
 140         },
 141 #endif
 142 #ifdef CONFIG_SHA256
 143         {
 144                 .name           = "sha256",
 145                 .digest_size    = SHA256_SUM_LEN,
 146                 .chunk_size     = CHUNKSZ_SHA256,
 147 #ifdef CONFIG_SHA_HW_ACCEL
 148                 .hash_func_ws   = hw_sha256,
 149 #else
 150                 .hash_func_ws   = sha256_csum_wd,
 151 #endif
 152 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 153                 .hash_init      = hw_sha_init,
 154                 .hash_update    = hw_sha_update,
 155                 .hash_finish    = hw_sha_finish,
 156 #else
 157                 .hash_init      = hash_init_sha256,
 158                 .hash_update    = hash_update_sha256,
 159                 .hash_finish    = hash_finish_sha256,
 160 #endif
 161         },
 162 #endif
 163         {
 164                 .name           = "crc32",
 165                 .digest_size    = 4,
 166                 .chunk_size     = CHUNKSZ_CRC32,
 167                 .hash_func_ws   = crc32_wd_buf,
 168                 .hash_init      = hash_init_crc32,
 169                 .hash_update    = hash_update_crc32,
 170                 .hash_finish    = hash_finish_crc32,
 171         },
 172 };
 173
 174 /* Try to minimize code size for boards that don't want much hashing */
 175 #if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM) || \
 176         defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_CMD_HASH)
 177 #define multi_hash()    1
 178 #else
 179 #define multi_hash()    0
 180 #endif
 181
 182 int hash_lookup_algo(const char *algo_name, struct hash_algo **algop)
 183 {
 184         int i;
 185
 186         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 187                 if (!strcmp(algo_name, hash_algo[i].name)) {
 188                         *algop = &hash_algo[i];
 189                         return 0;
 190                 }
 191         }
 192
 193         debug("Unknown hash algorithm '%s'\n", algo_name);
 194         return -EPROTONOSUPPORT;
 195 }
 196
 197 int hash_progressive_lookup_algo(const char *algo_name,
 198                                  struct hash_algo **algop)
 199 {
 200         int i;
 201
 202         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 203                 if (!strcmp(algo_name, hash_algo[i].name)) {
 204                         if (hash_algo[i].hash_init) {
 205                                 *algop = &hash_algo[i];
 206                                 return 0;
 207                         }
 208                 }
 209         }
 210
 211         debug("Unknown hash algorithm '%s'\n", algo_name);
 212         return -EPROTONOSUPPORT;
 213 }
 214
 215 #ifndef USE_HOSTCC
 216 int hash_parse_string(const char *algo_name, const char *str, uint8_t *result)
 217 {
 218         struct hash_algo *algo;
 219         int ret;
 220         int i;
 221
 222         ret = hash_lookup_algo(algo_name, &algo);
 223         if (ret)
 224                 return ret;
 225
 226         for (i = 0; i < algo->digest_size; i++) {
 227                 char chr[3];
 228
 229                 strncpy(chr, &str[i * 2], 2);
 230                 result[i] = simple_strtoul(chr, NULL, 16);
 231         }
 232
 233         return 0;
 234 }
 235
 236 int hash_block(const char *algo_name, const void *data, unsigned int len,
 237                uint8_t *output, int *output_size)
 238 {
 239         struct hash_algo *algo;
 240         int ret;
 241
 242         ret = hash_lookup_algo(algo_name, &algo);
 243         if (ret)
 244                 return ret;
 245
 246         if (output_size && *output_size < algo->digest_size) {
 247                 debug("Output buffer size %d too small (need %d bytes)",
 248                       *output_size, algo->digest_size);
 249                 return -ENOSPC;
 250         }
 251         if (output_size)
 252                 *output_size = algo->digest_size;
 253         algo->hash_func_ws(data, len, output, algo->chunk_size);
 254
 255         return 0;
 256 }
 257
 258 #if defined(CONFIG_CMD_HASH) || defined(CONFIG_CMD_SHA1SUM) || defined(CONFIG_CMD_CRC32)
 259 /**
 260  * store_result: Store the resulting sum to an address or variable
 261  *
 262  * @algo:               Hash algorithm being used
 263  * @sum:                Hash digest (algo->digest_size bytes)
 264  * @dest:               Destination, interpreted as a hex address if it starts
 265  *                      with * (or allow_env_vars is 0) or otherwise as an
 266  *                      environment variable.
 267  * @allow_env_vars:     non-zero to permit storing the result to an
 268  *                      variable environment
 269  */
 270 static void store_result(struct hash_algo *algo, const uint8_t *sum,
 271                          const char *dest, int allow_env_vars)
 272 {
 273         unsigned int i;
 274         int env_var = 0;
 275
 276         /*
 277          * If environment variables are allowed, then we assume that 'dest'
 278          * is an environment variable, unless it starts with *, in which
 279          * case we assume it is an address. If not allowed, it is always an
 280          * address. This is to support the crc32 command.
 281          */
 282         if (allow_env_vars) {
 283                 if (*dest == '*')
 284                         dest++;
 285                 else
 286                         env_var = 1;
 287         }
 288
 289         if (env_var) {
 290                 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
 291                 char *str_ptr = str_output;
 292
 293                 for (i = 0; i < algo->digest_size; i++) {
 294                         sprintf(str_ptr, "%02x", sum[i]);
 295                         str_ptr += 2;
 296                 }
 297                 *str_ptr = '\0';
 298                 env_set(dest, str_output);
 299         } else {
 300                 ulong addr;
 301                 void *buf;
 302
 303                 addr = simple_strtoul(dest, NULL, 16);
 304                 buf = map_sysmem(addr, algo->digest_size);
 305                 memcpy(buf, sum, algo->digest_size);
 306                 unmap_sysmem(buf);
 307         }
 308 }
 309
 310 /**
 311  * parse_verify_sum: Parse a hash verification parameter
 312  *
 313  * @algo:               Hash algorithm being used
 314  * @verify_str:         Argument to parse. If it starts with * then it is
 315  *                      interpreted as a hex address containing the hash.
 316  *                      If the length is exactly the right number of hex digits
 317  *                      for the digest size, then we assume it is a hex digest.
 318  *                      Otherwise we assume it is an environment variable, and
 319  *                      look up its value (it must contain a hex digest).
 320  * @vsum:               Returns binary digest value (algo->digest_size bytes)
 321  * @allow_env_vars:     non-zero to permit storing the result to an environment
 322  *                      variable. If 0 then verify_str is assumed to be an
 323  *                      address, and the * prefix is not expected.
 324  * @return 0 if ok, non-zero on error
 325  */
 326 static int parse_verify_sum(struct hash_algo *algo, char *verify_str,
 327                             uint8_t *vsum, int allow_env_vars)
 328 {
 329         int env_var = 0;
 330
 331         /* See comment above in store_result() */
 332         if (allow_env_vars) {
 333                 if (*verify_str == '*')
 334                         verify_str++;
 335                 else
 336                         env_var = 1;
 337         }
 338
 339         if (!env_var) {
 340                 ulong addr;
 341                 void *buf;
 342
 343                 addr = simple_strtoul(verify_str, NULL, 16);
 344                 buf = map_sysmem(addr, algo->digest_size);
 345                 memcpy(vsum, buf, algo->digest_size);
 346         } else {
 347                 char *vsum_str;
 348                 int digits = algo->digest_size * 2;
 349
 350                 /*
 351                  * As with the original code from sha1sum.c, we assume that a
 352                  * string which matches the digest size exactly is a hex
 353                  * string and not an environment variable.
 354                  */
 355                 if (strlen(verify_str) == digits)
 356                         vsum_str = verify_str;
 357                 else {
 358                         vsum_str = env_get(verify_str);
 359                         if (vsum_str == NULL || strlen(vsum_str) != digits) {
 360                                 printf("Expected %d hex digits in env var\n",
 361                                        digits);
 362                                 return 1;
 363                         }
 364                 }
 365
 366                 hash_parse_string(algo->name, vsum_str, vsum);
 367         }
 368         return 0;
 369 }
 370
 371 static void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t *output)
 372 {
 373         int i;
 374
 375         printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
 376         for (i = 0; i < algo->digest_size; i++)
 377                 printf("%02x", output[i]);
 378 }
 379
 380 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
 381                  int argc, char * const argv[])
 382 {
 383         ulong addr, len;
 384
 385         if ((argc < 2) || ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
 386                 return CMD_RET_USAGE;
 387
 388         addr = simple_strtoul(*argv++, NULL, 16);
 389         len = simple_strtoul(*argv++, NULL, 16);
 390
 391         if (multi_hash()) {
 392                 struct hash_algo *algo;
 393                 u8 *output;
 394                 uint8_t vsum[HASH_MAX_DIGEST_SIZE];
 395                 void *buf;
 396
 397                 if (hash_lookup_algo(algo_name, &algo)) {
 398                         printf("Unknown hash algorithm '%s'\n", algo_name);
 399                         return CMD_RET_USAGE;
 400                 }
 401                 argc -= 2;
 402
 403                 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
 404                         puts("HASH_MAX_DIGEST_SIZE exceeded\n");
 405                         return 1;
 406                 }
 407
 408                 output = memalign(ARCH_DMA_MINALIGN,
 409                                   sizeof(uint32_t) * HASH_MAX_DIGEST_SIZE);
 410
 411                 buf = map_sysmem(addr, len);
 412                 algo->hash_func_ws(buf, len, output, algo->chunk_size);
 413                 unmap_sysmem(buf);
 414
 415                 /* Try to avoid code bloat when verify is not needed */
 416 #if defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_SHA1SUM_VERIFY) || \
 417         defined(CONFIG_HASH_VERIFY)
 418                 if (flags & HASH_FLAG_VERIFY) {
 419 #else
 420                 if (0) {
 421 #endif
 422                         if (parse_verify_sum(algo, *argv, vsum,
 423                                         flags & HASH_FLAG_ENV)) {
 424                                 printf("ERROR: %s does not contain a valid "
 425                                         "%s sum\n", *argv, algo->name);
 426                                 return 1;
 427                         }
 428                         if (memcmp(output, vsum, algo->digest_size) != 0) {
 429                                 int i;
 430
 431                                 hash_show(algo, addr, len, output);
 432                                 printf(" != ");
 433                                 for (i = 0; i < algo->digest_size; i++)
 434                                         printf("%02x", vsum[i]);
 435                                 puts(" ** ERROR **\n");
 436                                 return 1;
 437                         }
 438                 } else {
 439                         hash_show(algo, addr, len, output);
 440                         printf("\n");
 441
 442                         if (argc) {
 443                                 store_result(algo, output, *argv,
 444                                         flags & HASH_FLAG_ENV);
 445                         }
 446                 unmap_sysmem(output);
 447
 448                 }
 449
 450         /* Horrible code size hack for boards that just want crc32 */
 451         } else {
 452                 ulong crc;
 453                 ulong *ptr;
 454
 455                 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
 456
 457                 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
 458                                 addr, addr + len - 1, crc);
 459
 460                 if (argc >= 3) {
 461                         ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
 462                         *ptr = crc;
 463                 }
 464         }
 465
 466         return 0;
 467 }
 468 #endif /* CONFIG_CMD_HASH || CONFIG_CMD_SHA1SUM || CONFIG_CMD_CRC32) */
 469 #endif /* !USE_HOSTCC */