busybox/coreutils/md5_sha1_sum.c
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   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Copyright (C) 2003 Glenn L. McGrath
   4 * Copyright (C) 2003-2004 Erik Andersen
   5 *
   6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   7 */
   8//config:config MD5SUM
   9//config:       bool "md5sum (6.5 kb)"
  10//config:       default y
  11//config:       help
  12//config:       Compute and check MD5 message digest
  13//config:
  14//config:config SHA1SUM
  15//config:       bool "sha1sum (5.9 kb)"
  16//config:       default y
  17//config:       help
  18//config:       Compute and check SHA1 message digest
  19//config:
  20//config:config SHA256SUM
  21//config:       bool "sha256sum (7 kb)"
  22//config:       default y
  23//config:       help
  24//config:       Compute and check SHA256 message digest
  25//config:
  26//config:config SHA512SUM
  27//config:       bool "sha512sum (7.4 kb)"
  28//config:       default y
  29//config:       help
  30//config:       Compute and check SHA512 message digest
  31//config:
  32//config:config SHA3SUM
  33//config:       bool "sha3sum (6.1 kb)"
  34//config:       default y
  35//config:       help
  36//config:       Compute and check SHA3 message digest
  37//config:
  38//config:comment "Common options for md5sum, sha1sum, sha256sum, sha512sum, sha3sum"
  39//config:       depends on MD5SUM || SHA1SUM || SHA256SUM || SHA512SUM || SHA3SUM
  40//config:
  41//config:config FEATURE_MD5_SHA1_SUM_CHECK
  42//config:       bool "Enable -c, -s and -w options"
  43//config:       default y
  44//config:       depends on MD5SUM || SHA1SUM || SHA256SUM || SHA512SUM || SHA3SUM
  45//config:       help
  46//config:       Enabling the -c options allows files to be checked
  47//config:       against pre-calculated hash values.
  48//config:       -s and -w are useful options when verifying checksums.
  49
  50//applet:IF_MD5SUM(APPLET_NOEXEC(md5sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, md5sum))
  51//applet:IF_SHA1SUM(APPLET_NOEXEC(sha1sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha1sum))
  52//applet:IF_SHA3SUM(APPLET_NOEXEC(sha3sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha3sum))
  53//applet:IF_SHA256SUM(APPLET_NOEXEC(sha256sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha256sum))
  54//applet:IF_SHA512SUM(APPLET_NOEXEC(sha512sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha512sum))
  55
  56//kbuild:lib-$(CONFIG_MD5SUM)    += md5_sha1_sum.o
  57//kbuild:lib-$(CONFIG_SHA1SUM)   += md5_sha1_sum.o
  58//kbuild:lib-$(CONFIG_SHA256SUM) += md5_sha1_sum.o
  59//kbuild:lib-$(CONFIG_SHA512SUM) += md5_sha1_sum.o
  60//kbuild:lib-$(CONFIG_SHA3SUM)   += md5_sha1_sum.o
  61
  62//usage:#define md5sum_trivial_usage
  63//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  64//usage:#define md5sum_full_usage "\n\n"
  65//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " MD5 checksums"
  66//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  67//usage:     "\n        -c      Check sums against list in FILEs"
  68//usage:     "\n        -s      Don't output anything, status code shows success"
  69//usage:     "\n        -w      Warn about improperly formatted checksum lines"
  70//usage:        )
  71//usage:
  72//usage:#define md5sum_example_usage
  73//usage:       "$ md5sum < busybox\n"
  74//usage:       "6fd11e98b98a58f64ff3398d7b324003\n"
  75//usage:       "$ md5sum busybox\n"
  76//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
  77//usage:       "$ md5sum -c -\n"
  78//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
  79//usage:       "busybox: OK\n"
  80//usage:       "^D\n"
  81//usage:
  82//usage:#define sha1sum_trivial_usage
  83//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  84//usage:#define sha1sum_full_usage "\n\n"
  85//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA1 checksums"
  86//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  87//usage:     "\n        -c      Check sums against list in FILEs"
  88//usage:     "\n        -s      Don't output anything, status code shows success"
  89//usage:     "\n        -w      Warn about improperly formatted checksum lines"
  90//usage:        )
  91//usage:
  92//usage:#define sha256sum_trivial_usage
  93//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  94//usage:#define sha256sum_full_usage "\n\n"
  95//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA256 checksums"
  96//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  97//usage:     "\n        -c      Check sums against list in FILEs"
  98//usage:     "\n        -s      Don't output anything, status code shows success"
  99//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 100//usage:        )
 101//usage:
 102//usage:#define sha512sum_trivial_usage
 103//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
 104//usage:#define sha512sum_full_usage "\n\n"
 105//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA512 checksums"
 106//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
 107//usage:     "\n        -c      Check sums against list in FILEs"
 108//usage:     "\n        -s      Don't output anything, status code shows success"
 109//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 110//usage:        )
 111//usage:
 112//usage:#define sha3sum_trivial_usage
 113//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[-a BITS] [FILE]..."
 114//usage:#define sha3sum_full_usage "\n\n"
 115//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA3 checksums"
 116//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
 117//usage:     "\n        -c      Check sums against list in FILEs"
 118//usage:     "\n        -s      Don't output anything, status code shows success"
 119//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 120//usage:        )
 121//usage:     "\n        -a BITS 224 (default), 256, 384, 512"
 122
 123//FIXME: GNU coreutils 8.25 has no -s option, it has only these two long opts:
 124// --quiet   don't print OK for each successfully verified file
 125// --status  don't output anything, status code shows success
 126
 127#include "libbb.h"
 128
 129/* This is a NOEXEC applet. Be very careful! */
 130
 131enum {
 132        /* 4th letter of applet_name is... */
 133        HASH_MD5 = 's', /* "md5>s<um" */
 134        HASH_SHA1 = '1',
 135        HASH_SHA256 = '2',
 136        HASH_SHA3 = '3',
 137        HASH_SHA512 = '5',
 138};
 139
 140#define FLAG_SILENT  1
 141#define FLAG_CHECK   2
 142#define FLAG_WARN    4
 143
 144/* This might be useful elsewhere */
 145static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
 146                                unsigned hash_length)
 147{
 148        /* xzalloc zero-terminates */
 149        char *hex_value = xzalloc((hash_length * 2) + 1);
 150        bin2hex(hex_value, (char*)hash_value, hash_length);
 151        return (unsigned char *)hex_value;
 152}
 153
 154#if !ENABLE_SHA3SUM
 155# define hash_file(f,w) hash_file(f)
 156#endif
 157static uint8_t *hash_file(const char *filename, unsigned sha3_width)
 158{
 159        int src_fd, hash_len, count;
 160        union _ctx_ {
 161                sha3_ctx_t sha3;
 162                sha512_ctx_t sha512;
 163                sha256_ctx_t sha256;
 164                sha1_ctx_t sha1;
 165                md5_ctx_t md5;
 166        } context;
 167        uint8_t *hash_value;
 168        void FAST_FUNC (*update)(void*, const void*, size_t);
 169        unsigned FAST_FUNC (*final)(void*, void*);
 170        char hash_algo;
 171
 172        src_fd = open_or_warn_stdin(filename);
 173        if (src_fd < 0) {
 174                return NULL;
 175        }
 176
 177        hash_algo = applet_name[3];
 178
 179        /* figure specific hash algorithms */
 180        if (ENABLE_MD5SUM && hash_algo == HASH_MD5) {
 181                md5_begin(&context.md5);
 182                update = (void*)md5_hash;
 183                final = (void*)md5_end;
 184                hash_len = 16;
 185        }
 186        else if (ENABLE_SHA1SUM && hash_algo == HASH_SHA1) {
 187                sha1_begin(&context.sha1);
 188                update = (void*)sha1_hash;
 189                final = (void*)sha1_end;
 190                hash_len = 20;
 191        }
 192        else if (ENABLE_SHA256SUM && hash_algo == HASH_SHA256) {
 193                sha256_begin(&context.sha256);
 194                update = (void*)sha256_hash;
 195                final = (void*)sha256_end;
 196                hash_len = 32;
 197        }
 198        else if (ENABLE_SHA512SUM && hash_algo == HASH_SHA512) {
 199                sha512_begin(&context.sha512);
 200                update = (void*)sha512_hash;
 201                final = (void*)sha512_end;
 202                hash_len = 64;
 203        }
 204#if ENABLE_SHA3SUM
 205        else if (ENABLE_SHA3SUM && hash_algo == HASH_SHA3) {
 206                sha3_begin(&context.sha3);
 207                update = (void*)sha3_hash;
 208                final = (void*)sha3_end;
 209                /*
 210                 * Should support 224, 256, 384, 512.
 211                 * We allow any value which does not blow the algorithm up.
 212                 */
 213                if (sha3_width >= 1600/2 /* input block can't be <= 0 */
 214                 || sha3_width == 0      /* hash len can't be 0 */
 215                 || (sha3_width & 0x1f)  /* should be multiple of 32 */
 216                /* (because input uses up to 8 byte wide word XORs. 32/4=8) */
 217                ) {
 218                        bb_error_msg_and_die("bad -a%u", sha3_width);
 219                }
 220                sha3_width /= 4;
 221                context.sha3.input_block_bytes = 1600/8 - sha3_width;
 222                hash_len = sha3_width/2;
 223        }
 224#endif
 225        else {
 226                xfunc_die(); /* can't reach this */
 227        }
 228
 229        {
 230                RESERVE_CONFIG_UBUFFER(in_buf, 4096);
 231                while ((count = safe_read(src_fd, in_buf, 4096)) > 0) {
 232                        update(&context, in_buf, count);
 233                }
 234                hash_value = NULL;
 235                if (count < 0)
 236                        bb_perror_msg("can't read '%s'", filename);
 237                else /* count == 0 */ {
 238                        final(&context, in_buf);
 239                        hash_value = hash_bin_to_hex(in_buf, hash_len);
 240                }
 241                RELEASE_CONFIG_BUFFER(in_buf);
 242        }
 243
 244        if (src_fd != STDIN_FILENO) {
 245                close(src_fd);
 246        }
 247
 248        return hash_value;
 249}
 250
 251int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 252int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
 253{
 254        int return_value = EXIT_SUCCESS;
 255        unsigned flags;
 256#if ENABLE_SHA3SUM
 257        unsigned sha3_width = 224;
 258#endif
 259
 260        if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) {
 261                /* -b "binary", -t "text" are ignored (shaNNNsum compat) */
 262                /* -s and -w require -c */
 263#if ENABLE_SHA3SUM
 264                if (applet_name[3] == HASH_SHA3)
 265                        flags = getopt32(argv, "^" "scwbta:+" "\0" "s?c:w?c", &sha3_width);
 266                else
 267#endif
 268                        flags = getopt32(argv, "^" "scwbt" "\0" "s?c:w?c");
 269        } else {
 270#if ENABLE_SHA3SUM
 271                if (applet_name[3] == HASH_SHA3)
 272                        getopt32(argv, "a:+", &sha3_width);
 273                else
 274#endif
 275                        getopt32(argv, "");
 276        }
 277        argv += optind;
 278        //argc -= optind;
 279        if (!*argv)
 280                *--argv = (char*)"-";
 281
 282        do {
 283                if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
 284                        FILE *pre_computed_stream;
 285                        char *line;
 286                        int count_total = 0;
 287                        int count_failed = 0;
 288
 289                        pre_computed_stream = xfopen_stdin(*argv);
 290
 291                        while ((line = xmalloc_fgetline(pre_computed_stream)) != NULL) {
 292                                uint8_t *hash_value;
 293                                char *filename_ptr;
 294
 295                                count_total++;
 296                                filename_ptr = strstr(line, "  ");
 297                                /* handle format for binary checksums */
 298                                if (filename_ptr == NULL) {
 299                                        filename_ptr = strstr(line, " *");
 300                                }
 301                                if (filename_ptr == NULL) {
 302                                        if (flags & FLAG_WARN) {
 303                                                bb_simple_error_msg("invalid format");
 304                                        }
 305                                        count_failed++;
 306                                        return_value = EXIT_FAILURE;
 307                                        free(line);
 308                                        continue;
 309                                }
 310                                *filename_ptr = '\0';
 311                                filename_ptr += 2;
 312
 313                                hash_value = hash_file(filename_ptr, sha3_width);
 314
 315                                if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
 316                                        if (!(flags & FLAG_SILENT))
 317                                                printf("%s: OK\n", filename_ptr);
 318                                } else {
 319                                        if (!(flags & FLAG_SILENT))
 320                                                printf("%s: FAILED\n", filename_ptr);
 321                                        count_failed++;
 322                                        return_value = EXIT_FAILURE;
 323                                }
 324                                /* possible free(NULL) */
 325                                free(hash_value);
 326                                free(line);
 327                        }
 328                        if (count_failed && !(flags & FLAG_SILENT)) {
 329                                bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
 330                                                count_failed, count_total);
 331                        }
 332                        if (count_total == 0) {
 333                                return_value = EXIT_FAILURE;
 334                                /*
 335                                 * md5sum from GNU coreutils 8.25 says:
 336                                 * md5sum: <FILE>: no properly formatted MD5 checksum lines found
 337                                 */
 338                                bb_error_msg("%s: no checksum lines found", *argv);
 339                        }
 340                        fclose_if_not_stdin(pre_computed_stream);
 341                } else {
 342                        uint8_t *hash_value = hash_file(*argv, sha3_width);
 343                        if (hash_value == NULL) {
 344                                return_value = EXIT_FAILURE;
 345                        } else {
 346                                printf("%s  %s\n", hash_value, *argv);
 347                                free(hash_value);
 348                        }
 349                }
 350        } while (*++argv);
 351
 352        return return_value;
 353}
 354