common/hash.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2012 The Chromium OS Authors.
   4  *
   5  * (C) Copyright 2011
   6  * Joe Hershberger, National Instruments, joe.hershberger@ni.com
   7  *
   8  * (C) Copyright 2000
   9  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  10  */
  11
  12 #ifndef USE_HOSTCC
  13 #include <common.h>
  14 #include <command.h>
  15 #include <env.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_crc16_ccitt(struct hash_algo *algo, void **ctxp)
  90 {
  91         uint16_t *ctx = malloc(sizeof(uint16_t));
  92         *ctx = 0;
  93         *ctxp = ctx;
  94         return 0;
  95 }
  96
  97 static int hash_update_crc16_ccitt(struct hash_algo *algo, void *ctx,
  98                                    const void *buf, unsigned int size,
  99                                    int is_last)
 100 {
 101         *((uint16_t *)ctx) = crc16_ccitt(*((uint16_t *)ctx), buf, size);
 102         return 0;
 103 }
 104
 105 static int hash_finish_crc16_ccitt(struct hash_algo *algo, void *ctx,
 106                                    void *dest_buf, int size)
 107 {
 108         if (size < algo->digest_size)
 109                 return -1;
 110
 111         *((uint16_t *)dest_buf) = *((uint16_t *)ctx);
 112         free(ctx);
 113         return 0;
 114 }
 115
 116 static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
 117 {
 118         uint32_t *ctx = malloc(sizeof(uint32_t));
 119         *ctx = 0;
 120         *ctxp = ctx;
 121         return 0;
 122 }
 123
 124 static int hash_update_crc32(struct hash_algo *algo, void *ctx,
 125                              const void *buf, unsigned int size, int is_last)
 126 {
 127         *((uint32_t *)ctx) = crc32(*((uint32_t *)ctx), buf, size);
 128         return 0;
 129 }
 130
 131 static int hash_finish_crc32(struct hash_algo *algo, void *ctx, void *dest_buf,
 132                              int size)
 133 {
 134         if (size < algo->digest_size)
 135                 return -1;
 136
 137         *((uint32_t *)dest_buf) = *((uint32_t *)ctx);
 138         free(ctx);
 139         return 0;
 140 }
 141
 142 /*
 143  * These are the hash algorithms we support.  If we have hardware acceleration
 144  * is enable we will use that, otherwise a software version of the algorithm.
 145  * Note that algorithm names must be in lower case.
 146  */
 147 static struct hash_algo hash_algo[] = {
 148 #ifdef CONFIG_SHA1
 149         {
 150                 .name           = "sha1",
 151                 .digest_size    = SHA1_SUM_LEN,
 152                 .chunk_size     = CHUNKSZ_SHA1,
 153 #ifdef CONFIG_SHA_HW_ACCEL
 154                 .hash_func_ws   = hw_sha1,
 155 #else
 156                 .hash_func_ws   = sha1_csum_wd,
 157 #endif
 158 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 159                 .hash_init      = hw_sha_init,
 160                 .hash_update    = hw_sha_update,
 161                 .hash_finish    = hw_sha_finish,
 162 #else
 163                 .hash_init      = hash_init_sha1,
 164                 .hash_update    = hash_update_sha1,
 165                 .hash_finish    = hash_finish_sha1,
 166 #endif
 167         },
 168 #endif
 169 #ifdef CONFIG_SHA256
 170         {
 171                 .name           = "sha256",
 172                 .digest_size    = SHA256_SUM_LEN,
 173                 .chunk_size     = CHUNKSZ_SHA256,
 174 #ifdef CONFIG_SHA_HW_ACCEL
 175                 .hash_func_ws   = hw_sha256,
 176 #else
 177                 .hash_func_ws   = sha256_csum_wd,
 178 #endif
 179 #ifdef CONFIG_SHA_PROG_HW_ACCEL
 180                 .hash_init      = hw_sha_init,
 181                 .hash_update    = hw_sha_update,
 182                 .hash_finish    = hw_sha_finish,
 183 #else
 184                 .hash_init      = hash_init_sha256,
 185                 .hash_update    = hash_update_sha256,
 186                 .hash_finish    = hash_finish_sha256,
 187 #endif
 188         },
 189 #endif
 190         {
 191                 .name           = "crc16-ccitt",
 192                 .digest_size    = 2,
 193                 .chunk_size     = CHUNKSZ,
 194                 .hash_func_ws   = crc16_ccitt_wd_buf,
 195                 .hash_init      = hash_init_crc16_ccitt,
 196                 .hash_update    = hash_update_crc16_ccitt,
 197                 .hash_finish    = hash_finish_crc16_ccitt,
 198         },
 199         {
 200                 .name           = "crc32",
 201                 .digest_size    = 4,
 202                 .chunk_size     = CHUNKSZ_CRC32,
 203                 .hash_func_ws   = crc32_wd_buf,
 204                 .hash_init      = hash_init_crc32,
 205                 .hash_update    = hash_update_crc32,
 206                 .hash_finish    = hash_finish_crc32,
 207         },
 208 };
 209
 210 /* Try to minimize code size for boards that don't want much hashing */
 211 #if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM) || \
 212         defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_CMD_HASH)
 213 #define multi_hash()    1
 214 #else
 215 #define multi_hash()    0
 216 #endif
 217
 218 int hash_lookup_algo(const char *algo_name, struct hash_algo **algop)
 219 {
 220         int i;
 221
 222         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 223                 if (!strcmp(algo_name, hash_algo[i].name)) {
 224                         *algop = &hash_algo[i];
 225                         return 0;
 226                 }
 227         }
 228
 229         debug("Unknown hash algorithm '%s'\n", algo_name);
 230         return -EPROTONOSUPPORT;
 231 }
 232
 233 int hash_progressive_lookup_algo(const char *algo_name,
 234                                  struct hash_algo **algop)
 235 {
 236         int i;
 237
 238         for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
 239                 if (!strcmp(algo_name, hash_algo[i].name)) {
 240                         if (hash_algo[i].hash_init) {
 241                                 *algop = &hash_algo[i];
 242                                 return 0;
 243                         }
 244                 }
 245         }
 246
 247         debug("Unknown hash algorithm '%s'\n", algo_name);
 248         return -EPROTONOSUPPORT;
 249 }
 250
 251 #ifndef USE_HOSTCC
 252 int hash_parse_string(const char *algo_name, const char *str, uint8_t *result)
 253 {
 254         struct hash_algo *algo;
 255         int ret;
 256         int i;
 257
 258         ret = hash_lookup_algo(algo_name, &algo);
 259         if (ret)
 260                 return ret;
 261
 262         for (i = 0; i < algo->digest_size; i++) {
 263                 char chr[3];
 264
 265                 strncpy(chr, &str[i * 2], 2);
 266                 result[i] = simple_strtoul(chr, NULL, 16);
 267         }
 268
 269         return 0;
 270 }
 271
 272 int hash_block(const char *algo_name, const void *data, unsigned int len,
 273                uint8_t *output, int *output_size)
 274 {
 275         struct hash_algo *algo;
 276         int ret;
 277
 278         ret = hash_lookup_algo(algo_name, &algo);
 279         if (ret)
 280                 return ret;
 281
 282         if (output_size && *output_size < algo->digest_size) {
 283                 debug("Output buffer size %d too small (need %d bytes)",
 284                       *output_size, algo->digest_size);
 285                 return -ENOSPC;
 286         }
 287         if (output_size)
 288                 *output_size = algo->digest_size;
 289         algo->hash_func_ws(data, len, output, algo->chunk_size);
 290
 291         return 0;
 292 }
 293
 294 #if defined(CONFIG_CMD_HASH) || defined(CONFIG_CMD_SHA1SUM) || defined(CONFIG_CMD_CRC32)
 295 /**
 296  * store_result: Store the resulting sum to an address or variable
 297  *
 298  * @algo:               Hash algorithm being used
 299  * @sum:                Hash digest (algo->digest_size bytes)
 300  * @dest:               Destination, interpreted as a hex address if it starts
 301  *                      with * (or allow_env_vars is 0) or otherwise as an
 302  *                      environment variable.
 303  * @allow_env_vars:     non-zero to permit storing the result to an
 304  *                      variable environment
 305  */
 306 static void store_result(struct hash_algo *algo, const uint8_t *sum,
 307                          const char *dest, int allow_env_vars)
 308 {
 309         unsigned int i;
 310         int env_var = 0;
 311
 312         /*
 313          * If environment variables are allowed, then we assume that 'dest'
 314          * is an environment variable, unless it starts with *, in which
 315          * case we assume it is an address. If not allowed, it is always an
 316          * address. This is to support the crc32 command.
 317          */
 318         if (allow_env_vars) {
 319                 if (*dest == '*')
 320                         dest++;
 321                 else
 322                         env_var = 1;
 323         }
 324
 325         if (env_var) {
 326                 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
 327                 char *str_ptr = str_output;
 328
 329                 for (i = 0; i < algo->digest_size; i++) {
 330                         sprintf(str_ptr, "%02x", sum[i]);
 331                         str_ptr += 2;
 332                 }
 333                 *str_ptr = '\0';
 334                 env_set(dest, str_output);
 335         } else {
 336                 ulong addr;
 337                 void *buf;
 338
 339                 addr = simple_strtoul(dest, NULL, 16);
 340                 buf = map_sysmem(addr, algo->digest_size);
 341                 memcpy(buf, sum, algo->digest_size);
 342                 unmap_sysmem(buf);
 343         }
 344 }
 345
 346 /**
 347  * parse_verify_sum: Parse a hash verification parameter
 348  *
 349  * @algo:               Hash algorithm being used
 350  * @verify_str:         Argument to parse. If it starts with * then it is
 351  *                      interpreted as a hex address containing the hash.
 352  *                      If the length is exactly the right number of hex digits
 353  *                      for the digest size, then we assume it is a hex digest.
 354  *                      Otherwise we assume it is an environment variable, and
 355  *                      look up its value (it must contain a hex digest).
 356  * @vsum:               Returns binary digest value (algo->digest_size bytes)
 357  * @allow_env_vars:     non-zero to permit storing the result to an environment
 358  *                      variable. If 0 then verify_str is assumed to be an
 359  *                      address, and the * prefix is not expected.
 360  * @return 0 if ok, non-zero on error
 361  */
 362 static int parse_verify_sum(struct hash_algo *algo, char *verify_str,
 363                             uint8_t *vsum, int allow_env_vars)
 364 {
 365         int env_var = 0;
 366
 367         /* See comment above in store_result() */
 368         if (allow_env_vars) {
 369                 if (*verify_str == '*')
 370                         verify_str++;
 371                 else
 372                         env_var = 1;
 373         }
 374
 375         if (!env_var) {
 376                 ulong addr;
 377                 void *buf;
 378
 379                 addr = simple_strtoul(verify_str, NULL, 16);
 380                 buf = map_sysmem(addr, algo->digest_size);
 381                 memcpy(vsum, buf, algo->digest_size);
 382         } else {
 383                 char *vsum_str;
 384                 int digits = algo->digest_size * 2;
 385
 386                 /*
 387                  * As with the original code from sha1sum.c, we assume that a
 388                  * string which matches the digest size exactly is a hex
 389                  * string and not an environment variable.
 390                  */
 391                 if (strlen(verify_str) == digits)
 392                         vsum_str = verify_str;
 393                 else {
 394                         vsum_str = env_get(verify_str);
 395                         if (vsum_str == NULL || strlen(vsum_str) != digits) {
 396                                 printf("Expected %d hex digits in env var\n",
 397                                        digits);
 398                                 return 1;
 399                         }
 400                 }
 401
 402                 hash_parse_string(algo->name, vsum_str, vsum);
 403         }
 404         return 0;
 405 }
 406
 407 static void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t *output)
 408 {
 409         int i;
 410
 411         printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
 412         for (i = 0; i < algo->digest_size; i++)
 413                 printf("%02x", output[i]);
 414 }
 415
 416 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
 417                  int argc, char * const argv[])
 418 {
 419         ulong addr, len;
 420
 421         if ((argc < 2) || ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
 422                 return CMD_RET_USAGE;
 423
 424         addr = simple_strtoul(*argv++, NULL, 16);
 425         len = simple_strtoul(*argv++, NULL, 16);
 426
 427         if (multi_hash()) {
 428                 struct hash_algo *algo;
 429                 u8 *output;
 430                 uint8_t vsum[HASH_MAX_DIGEST_SIZE];
 431                 void *buf;
 432
 433                 if (hash_lookup_algo(algo_name, &algo)) {
 434                         printf("Unknown hash algorithm '%s'\n", algo_name);
 435                         return CMD_RET_USAGE;
 436                 }
 437                 argc -= 2;
 438
 439                 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
 440                         puts("HASH_MAX_DIGEST_SIZE exceeded\n");
 441                         return 1;
 442                 }
 443
 444                 output = memalign(ARCH_DMA_MINALIGN,
 445                                   sizeof(uint32_t) * HASH_MAX_DIGEST_SIZE);
 446
 447                 buf = map_sysmem(addr, len);
 448                 algo->hash_func_ws(buf, len, output, algo->chunk_size);
 449                 unmap_sysmem(buf);
 450
 451                 /* Try to avoid code bloat when verify is not needed */
 452 #if defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_SHA1SUM_VERIFY) || \
 453         defined(CONFIG_HASH_VERIFY)
 454                 if (flags & HASH_FLAG_VERIFY) {
 455 #else
 456                 if (0) {
 457 #endif
 458                         if (parse_verify_sum(algo, *argv, vsum,
 459                                         flags & HASH_FLAG_ENV)) {
 460                                 printf("ERROR: %s does not contain a valid "
 461                                         "%s sum\n", *argv, algo->name);
 462                                 return 1;
 463                         }
 464                         if (memcmp(output, vsum, algo->digest_size) != 0) {
 465                                 int i;
 466
 467                                 hash_show(algo, addr, len, output);
 468                                 printf(" != ");
 469                                 for (i = 0; i < algo->digest_size; i++)
 470                                         printf("%02x", vsum[i]);
 471                                 puts(" ** ERROR **\n");
 472                                 return 1;
 473                         }
 474                 } else {
 475                         hash_show(algo, addr, len, output);
 476                         printf("\n");
 477
 478                         if (argc) {
 479                                 store_result(algo, output, *argv,
 480                                         flags & HASH_FLAG_ENV);
 481                         }
 482                 unmap_sysmem(output);
 483
 484                 }
 485
 486         /* Horrible code size hack for boards that just want crc32 */
 487         } else {
 488                 ulong crc;
 489                 ulong *ptr;
 490
 491                 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
 492
 493                 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
 494                                 addr, addr + len - 1, crc);
 495
 496                 if (argc >= 3) {
 497                         ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
 498                         *ptr = crc;
 499                 }
 500         }
 501
 502         return 0;
 503 }
 504 #endif /* CONFIG_CMD_HASH || CONFIG_CMD_SHA1SUM || CONFIG_CMD_CRC32) */
 505 #endif /* !USE_HOSTCC */