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 int hash_parse_string(const char *algo_name, const char *str, uint8_t *result)
 231 {
 232         struct hash_algo *algo;
 233         int ret;
 234         int i;
 235
 236         ret = hash_lookup_algo(algo_name, &algo);
 237         if (ret)
 238                 return ret;
 239
 240         for (i = 0; i < algo->digest_size; i++) {
 241                 char chr[3];
 242
 243                 strncpy(chr, &str[i * 2], 2);
 244                 result[i] = simple_strtoul(chr, NULL, 16);
 245         }
 246
 247         return 0;
 248 }
 249
 250 /**
 251  * store_result: Store the resulting sum to an address or variable
 252  *
 253  * @algo:               Hash algorithm being used
 254  * @sum:                Hash digest (algo->digest_size bytes)
 255  * @dest:               Destination, interpreted as a hex address if it starts
 256  *                      with * (or allow_env_vars is 0) or otherwise as an
 257  *                      environment variable.
 258  * @allow_env_vars:     non-zero to permit storing the result to an
 259  *                      variable environment
 260  */
 261 static void store_result(struct hash_algo *algo, const uint8_t *sum,
 262                          const char *dest, int allow_env_vars)
 263 {
 264         unsigned int i;
 265         int env_var = 0;
 266
 267         /*
 268          * If environment variables are allowed, then we assume that 'dest'
 269          * is an environment variable, unless it starts with *, in which
 270          * case we assume it is an address. If not allowed, it is always an
 271          * address. This is to support the crc32 command.
 272          */
 273         if (allow_env_vars) {
 274                 if (*dest == '*')
 275                         dest++;
 276                 else
 277                         env_var = 1;
 278         }
 279
 280         if (env_var) {
 281                 char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
 282                 char *str_ptr = str_output;
 283
 284                 for (i = 0; i < algo->digest_size; i++) {
 285                         sprintf(str_ptr, "%02x", sum[i]);
 286                         str_ptr += 2;
 287                 }
 288                 *str_ptr = '\0';
 289                 setenv(dest, str_output);
 290         } else {
 291                 ulong addr;
 292                 void *buf;
 293
 294                 addr = simple_strtoul(dest, NULL, 16);
 295                 buf = map_sysmem(addr, algo->digest_size);
 296                 memcpy(buf, sum, algo->digest_size);
 297                 unmap_sysmem(buf);
 298         }
 299 }
 300
 301 /**
 302  * parse_verify_sum: Parse a hash verification parameter
 303  *
 304  * @algo:               Hash algorithm being used
 305  * @verify_str:         Argument to parse. If it starts with * then it is
 306  *                      interpreted as a hex address containing the hash.
 307  *                      If the length is exactly the right number of hex digits
 308  *                      for the digest size, then we assume it is a hex digest.
 309  *                      Otherwise we assume it is an environment variable, and
 310  *                      look up its value (it must contain a hex digest).
 311  * @vsum:               Returns binary digest value (algo->digest_size bytes)
 312  * @allow_env_vars:     non-zero to permit storing the result to an environment
 313  *                      variable. If 0 then verify_str is assumed to be an
 314  *                      address, and the * prefix is not expected.
 315  * @return 0 if ok, non-zero on error
 316  */
 317 static int parse_verify_sum(struct hash_algo *algo, char *verify_str,
 318                             uint8_t *vsum, int allow_env_vars)
 319 {
 320         int env_var = 0;
 321
 322         /* See comment above in store_result() */
 323         if (allow_env_vars) {
 324                 if (*verify_str == '*')
 325                         verify_str++;
 326                 else
 327                         env_var = 1;
 328         }
 329
 330         if (!env_var) {
 331                 ulong addr;
 332                 void *buf;
 333
 334                 addr = simple_strtoul(verify_str, NULL, 16);
 335                 buf = map_sysmem(addr, algo->digest_size);
 336                 memcpy(vsum, buf, algo->digest_size);
 337         } else {
 338                 char *vsum_str;
 339                 int digits = algo->digest_size * 2;
 340
 341                 /*
 342                  * As with the original code from sha1sum.c, we assume that a
 343                  * string which matches the digest size exactly is a hex
 344                  * string and not an environment variable.
 345                  */
 346                 if (strlen(verify_str) == digits)
 347                         vsum_str = verify_str;
 348                 else {
 349                         vsum_str = getenv(verify_str);
 350                         if (vsum_str == NULL || strlen(vsum_str) != digits) {
 351                                 printf("Expected %d hex digits in env var\n",
 352                                        digits);
 353                                 return 1;
 354                         }
 355                 }
 356
 357                 hash_parse_string(algo->name, vsum_str, vsum);
 358         }
 359         return 0;
 360 }
 361
 362 void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t *output)
 363 {
 364         int i;
 365
 366         printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
 367         for (i = 0; i < algo->digest_size; i++)
 368                 printf("%02x", output[i]);
 369 }
 370
 371 int hash_block(const char *algo_name, const void *data, unsigned int len,
 372                uint8_t *output, int *output_size)
 373 {
 374         struct hash_algo *algo;
 375         int ret;
 376
 377         ret = hash_lookup_algo(algo_name, &algo);
 378         if (ret)
 379                 return ret;
 380
 381         if (output_size && *output_size < algo->digest_size) {
 382                 debug("Output buffer size %d too small (need %d bytes)",
 383                       *output_size, algo->digest_size);
 384                 return -ENOSPC;
 385         }
 386         if (output_size)
 387                 *output_size = algo->digest_size;
 388         algo->hash_func_ws(data, len, output, algo->chunk_size);
 389
 390         return 0;
 391 }
 392
 393 int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
 394                  int argc, char * const argv[])
 395 {
 396         ulong addr, len;
 397
 398         if ((argc < 2) || ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
 399                 return CMD_RET_USAGE;
 400
 401         addr = simple_strtoul(*argv++, NULL, 16);
 402         len = simple_strtoul(*argv++, NULL, 16);
 403
 404         if (multi_hash()) {
 405                 struct hash_algo *algo;
 406                 uint8_t output[HASH_MAX_DIGEST_SIZE];
 407                 uint8_t vsum[HASH_MAX_DIGEST_SIZE];
 408                 void *buf;
 409
 410                 if (hash_lookup_algo(algo_name, &algo)) {
 411                         printf("Unknown hash algorithm '%s'\n", algo_name);
 412                         return CMD_RET_USAGE;
 413                 }
 414                 argc -= 2;
 415
 416                 if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
 417                         puts("HASH_MAX_DIGEST_SIZE exceeded\n");
 418                         return 1;
 419                 }
 420
 421                 buf = map_sysmem(addr, len);
 422                 algo->hash_func_ws(buf, len, output, algo->chunk_size);
 423                 unmap_sysmem(buf);
 424
 425                 /* Try to avoid code bloat when verify is not needed */
 426 #ifdef CONFIG_HASH_VERIFY
 427                 if (flags & HASH_FLAG_VERIFY) {
 428 #else
 429                 if (0) {
 430 #endif
 431                         if (parse_verify_sum(algo, *argv, vsum,
 432                                         flags & HASH_FLAG_ENV)) {
 433                                 printf("ERROR: %s does not contain a valid "
 434                                         "%s sum\n", *argv, algo->name);
 435                                 return 1;
 436                         }
 437                         if (memcmp(output, vsum, algo->digest_size) != 0) {
 438                                 int i;
 439
 440                                 hash_show(algo, addr, len, output);
 441                                 printf(" != ");
 442                                 for (i = 0; i < algo->digest_size; i++)
 443                                         printf("%02x", vsum[i]);
 444                                 puts(" ** ERROR **\n");
 445                                 return 1;
 446                         }
 447                 } else {
 448                         hash_show(algo, addr, len, output);
 449                         printf("\n");
 450
 451                         if (argc) {
 452                                 store_result(algo, output, *argv,
 453                                         flags & HASH_FLAG_ENV);
 454                         }
 455                 }
 456
 457         /* Horrible code size hack for boards that just want crc32 */
 458         } else {
 459                 ulong crc;
 460                 ulong *ptr;
 461
 462                 crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
 463
 464                 printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
 465                                 addr, addr + len - 1, crc);
 466
 467                 if (argc >= 3) {
 468                         ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
 469                         *ptr = crc;
 470                 }
 471         }
 472
 473         return 0;
 474 }
 475 #endif