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"
  10//config:       default y
  11//config:       help
  12//config:         md5sum is used to print or check MD5 checksums.
  13//config:
  14//config:config SHA1SUM
  15//config:       bool "sha1sum"
  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"
  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"
  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"
  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:
  49//config:         -s and -w are useful options when verifying checksums.
  50
  51//applet:IF_MD5SUM(APPLET_NOEXEC(md5sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, md5sum))
  52//applet:IF_SHA1SUM(APPLET_NOEXEC(sha1sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha1sum))
  53//applet:IF_SHA3SUM(APPLET_NOEXEC(sha3sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha3sum))
  54//applet:IF_SHA256SUM(APPLET_NOEXEC(sha256sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha256sum))
  55//applet:IF_SHA512SUM(APPLET_NOEXEC(sha512sum, md5_sha1_sum, BB_DIR_USR_BIN, BB_SUID_DROP, sha512sum))
  56
  57//kbuild:lib-$(CONFIG_MD5SUM)    += md5_sha1_sum.o
  58//kbuild:lib-$(CONFIG_SHA1SUM)   += md5_sha1_sum.o
  59//kbuild:lib-$(CONFIG_SHA256SUM) += md5_sha1_sum.o
  60//kbuild:lib-$(CONFIG_SHA512SUM) += md5_sha1_sum.o
  61//kbuild:lib-$(CONFIG_SHA3SUM)   += md5_sha1_sum.o
  62
  63//usage:#define md5sum_trivial_usage
  64//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  65//usage:#define md5sum_full_usage "\n\n"
  66//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " MD5 checksums"
  67//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  68//usage:     "\n        -c      Check sums against list in FILEs"
  69//usage:     "\n        -s      Don't output anything, status code shows success"
  70//usage:     "\n        -w      Warn about improperly formatted checksum lines"
  71//usage:        )
  72//usage:
  73//usage:#define md5sum_example_usage
  74//usage:       "$ md5sum < busybox\n"
  75//usage:       "6fd11e98b98a58f64ff3398d7b324003\n"
  76//usage:       "$ md5sum busybox\n"
  77//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
  78//usage:       "$ md5sum -c -\n"
  79//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
  80//usage:       "busybox: OK\n"
  81//usage:       "^D\n"
  82//usage:
  83//usage:#define sha1sum_trivial_usage
  84//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  85//usage:#define sha1sum_full_usage "\n\n"
  86//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA1 checksums"
  87//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  88//usage:     "\n        -c      Check sums against list in FILEs"
  89//usage:     "\n        -s      Don't output anything, status code shows success"
  90//usage:     "\n        -w      Warn about improperly formatted checksum lines"
  91//usage:        )
  92//usage:
  93//usage:#define sha256sum_trivial_usage
  94//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
  95//usage:#define sha256sum_full_usage "\n\n"
  96//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA256 checksums"
  97//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
  98//usage:     "\n        -c      Check sums against list in FILEs"
  99//usage:     "\n        -s      Don't output anything, status code shows success"
 100//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 101//usage:        )
 102//usage:
 103//usage:#define sha512sum_trivial_usage
 104//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
 105//usage:#define sha512sum_full_usage "\n\n"
 106//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA512 checksums"
 107//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
 108//usage:     "\n        -c      Check sums against list in FILEs"
 109//usage:     "\n        -s      Don't output anything, status code shows success"
 110//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 111//usage:        )
 112//usage:
 113//usage:#define sha3sum_trivial_usage
 114//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[-a BITS] [FILE]..."
 115//usage:#define sha3sum_full_usage "\n\n"
 116//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA3 checksums"
 117//usage:        IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
 118//usage:     "\n        -c      Check sums against list in FILEs"
 119//usage:     "\n        -s      Don't output anything, status code shows success"
 120//usage:     "\n        -w      Warn about improperly formatted checksum lines"
 121//usage:     "\n        -a BITS 224 (default), 256, 384, 512"
 122//usage:        )
 123
 124//FIXME: GNU coreutils 8.25 has no -s option, it has only these two long opts:
 125// --quiet   don't print OK for each successfully verified file
 126// --status  don't output anything, status code shows success
 127
 128#include "libbb.h"
 129
 130/* This is a NOEXEC applet. Be very careful! */
 131
 132enum {
 133        /* 4th letter of applet_name is... */
 134        HASH_MD5 = 's', /* "md5>s<um" */
 135        HASH_SHA1 = '1',
 136        HASH_SHA256 = '2',
 137        HASH_SHA3 = '3',
 138        HASH_SHA512 = '5',
 139};
 140
 141#define FLAG_SILENT  1
 142#define FLAG_CHECK   2
 143#define FLAG_WARN    4
 144
 145/* This might be useful elsewhere */
 146static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
 147                                unsigned hash_length)
 148{
 149        /* xzalloc zero-terminates */
 150        char *hex_value = xzalloc((hash_length * 2) + 1);
 151        bin2hex(hex_value, (char*)hash_value, hash_length);
 152        return (unsigned char *)hex_value;
 153}
 154
 155#if !ENABLE_SHA3SUM
 156# define hash_file(f,w) hash_file(f)
 157#endif
 158static uint8_t *hash_file(const char *filename, unsigned sha3_width)
 159{
 160        int src_fd, hash_len, count;
 161        union _ctx_ {
 162                sha3_ctx_t sha3;
 163                sha512_ctx_t sha512;
 164                sha256_ctx_t sha256;
 165                sha1_ctx_t sha1;
 166                md5_ctx_t md5;
 167        } context;
 168        uint8_t *hash_value;
 169        void FAST_FUNC (*update)(void*, const void*, size_t);
 170        void FAST_FUNC (*final)(void*, void*);
 171        char hash_algo;
 172
 173        src_fd = open_or_warn_stdin(filename);
 174        if (src_fd < 0) {
 175                return NULL;
 176        }
 177
 178        hash_algo = applet_name[3];
 179
 180        /* figure specific hash algorithms */
 181        if (ENABLE_MD5SUM && hash_algo == HASH_MD5) {
 182                md5_begin(&context.md5);
 183                update = (void*)md5_hash;
 184                final = (void*)md5_end;
 185                hash_len = 16;
 186        }
 187        else if (ENABLE_SHA1SUM && hash_algo == HASH_SHA1) {
 188                sha1_begin(&context.sha1);
 189                update = (void*)sha1_hash;
 190                final = (void*)sha1_end;
 191                hash_len = 20;
 192        }
 193        else if (ENABLE_SHA256SUM && hash_algo == HASH_SHA256) {
 194                sha256_begin(&context.sha256);
 195                update = (void*)sha256_hash;
 196                final = (void*)sha256_end;
 197                hash_len = 32;
 198        }
 199        else if (ENABLE_SHA512SUM && hash_algo == HASH_SHA512) {
 200                sha512_begin(&context.sha512);
 201                update = (void*)sha512_hash;
 202                final = (void*)sha512_end;
 203                hash_len = 64;
 204        }
 205#if ENABLE_SHA3SUM
 206        else if (ENABLE_SHA3SUM && hash_algo == HASH_SHA3) {
 207                sha3_begin(&context.sha3);
 208                update = (void*)sha3_hash;
 209                final = (void*)sha3_end;
 210                /*
 211                 * Should support 224, 256, 384, 512.
 212                 * We allow any value which does not blow the algorithm up.
 213                 */
 214                if (sha3_width >= 1600/2 /* input block can't be <= 0 */
 215                 || sha3_width == 0      /* hash len can't be 0 */
 216                 || (sha3_width & 0x1f)  /* should be multiple of 32 */
 217                /* (because input uses up to 8 byte wide word XORs. 32/4=8) */
 218                ) {
 219                        bb_error_msg_and_die("bad -a%u", sha3_width);
 220                }
 221                sha3_width /= 4;
 222                context.sha3.input_block_bytes = 1600/8 - sha3_width;
 223                hash_len = sha3_width/2;
 224        }
 225#endif
 226        else {
 227                xfunc_die(); /* can't reach this */
 228        }
 229
 230        {
 231                RESERVE_CONFIG_UBUFFER(in_buf, 4096);
 232                while ((count = safe_read(src_fd, in_buf, 4096)) > 0) {
 233                        update(&context, in_buf, count);
 234                }
 235                hash_value = NULL;
 236                if (count < 0)
 237                        bb_perror_msg("can't read '%s'", filename);
 238                else /* count == 0 */ {
 239                        final(&context, in_buf);
 240                        hash_value = hash_bin_to_hex(in_buf, hash_len);
 241                }
 242                RELEASE_CONFIG_BUFFER(in_buf);
 243        }
 244
 245        if (src_fd != STDIN_FILENO) {
 246                close(src_fd);
 247        }
 248
 249        return hash_value;
 250}
 251
 252int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 253int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
 254{
 255        int return_value = EXIT_SUCCESS;
 256        unsigned flags;
 257#if ENABLE_SHA3SUM
 258        unsigned sha3_width = 224;
 259#endif
 260
 261        if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) {
 262                /* -s and -w require -c */
 263                opt_complementary = "s?c:w?c";
 264                /* -b "binary", -t "text" are ignored (shaNNNsum compat) */
 265#if ENABLE_SHA3SUM
 266                if (applet_name[3] == HASH_SHA3)
 267                        flags = getopt32(argv, "scwbta:+", &sha3_width);
 268                else
 269#endif
 270                        flags = getopt32(argv, "scwbt");
 271        } else {
 272#if ENABLE_SHA3SUM
 273                if (applet_name[3] == HASH_SHA3)
 274                        getopt32(argv, "a:+", &sha3_width);
 275                else
 276#endif
 277                        getopt32(argv, "");
 278        }
 279        argv += optind;
 280        //argc -= optind;
 281        if (!*argv)
 282                *--argv = (char*)"-";
 283
 284        do {
 285                if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
 286                        FILE *pre_computed_stream;
 287                        char *line;
 288                        int count_total = 0;
 289                        int count_failed = 0;
 290
 291                        pre_computed_stream = xfopen_stdin(*argv);
 292
 293                        while ((line = xmalloc_fgetline(pre_computed_stream)) != NULL) {
 294                                uint8_t *hash_value;
 295                                char *filename_ptr;
 296
 297                                count_total++;
 298                                filename_ptr = strstr(line, "  ");
 299                                /* handle format for binary checksums */
 300                                if (filename_ptr == NULL) {
 301                                        filename_ptr = strstr(line, " *");
 302                                }
 303                                if (filename_ptr == NULL) {
 304                                        if (flags & FLAG_WARN) {
 305                                                bb_error_msg("invalid format");
 306                                        }
 307                                        count_failed++;
 308                                        return_value = EXIT_FAILURE;
 309                                        free(line);
 310                                        continue;
 311                                }
 312                                *filename_ptr = '\0';
 313                                filename_ptr += 2;
 314
 315                                hash_value = hash_file(filename_ptr, sha3_width);
 316
 317                                if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
 318                                        if (!(flags & FLAG_SILENT))
 319                                                printf("%s: OK\n", filename_ptr);
 320                                } else {
 321                                        if (!(flags & FLAG_SILENT))
 322                                                printf("%s: FAILED\n", filename_ptr);
 323                                        count_failed++;
 324                                        return_value = EXIT_FAILURE;
 325                                }
 326                                /* possible free(NULL) */
 327                                free(hash_value);
 328                                free(line);
 329                        }
 330                        if (count_failed && !(flags & FLAG_SILENT)) {
 331                                bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
 332                                                count_failed, count_total);
 333                        }
 334                        if (count_total == 0) {
 335                                return_value = EXIT_FAILURE;
 336                                /*
 337                                 * md5sum from GNU coreutils 8.25 says:
 338                                 * md5sum: <FILE>: no properly formatted MD5 checksum lines found
 339                                 */
 340                                bb_error_msg("%s: no checksum lines found", *argv);
 341                        }
 342                        fclose_if_not_stdin(pre_computed_stream);
 343                } else {
 344                        uint8_t *hash_value = hash_file(*argv, sha3_width);
 345                        if (hash_value == NULL) {
 346                                return_value = EXIT_FAILURE;
 347                        } else {
 348                                printf("%s  %s\n", hash_value, *argv);
 349                                free(hash_value);
 350                        }
 351                }
 352        } while (*++argv);
 353
 354        return return_value;
 355}
 356