coreutils/md5_sha1_sum.c

   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 the GPL v2 or later, see the file LICENSE in this tarball.
   7  */
   8
   9 #include <fcntl.h>
  10 #include <limits.h>
  11 #include <stdio.h>
  12 #include <stdint.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16
  17 #include "busybox.h"
  18
  19 typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
  20
  21 #define FLAG_SILENT     1
  22 #define FLAG_CHECK      2
  23 #define FLAG_WARN       4
  24
  25 /* This might be useful elsewhere */
  26 static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
  27                                                                           unsigned char hash_length)
  28 {
  29         int x, len, max;
  30         unsigned char *hex_value;
  31
  32         max = (hash_length * 2) + 2;
  33         hex_value = xmalloc(max);
  34         for (x = len = 0; x < hash_length; x++) {
  35                 len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
  36         }
  37         return (hex_value);
  38 }
  39
  40 static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
  41 {
  42         int src_fd, hash_len, count;
  43         union _ctx_ {
  44                 sha1_ctx_t sha1;
  45                 md5_ctx_t md5;
  46         } context;
  47         uint8_t *hash_value = NULL;
  48         RESERVE_CONFIG_UBUFFER(in_buf, 4096);
  49         void (*update)(const void*, size_t, void*);
  50         void (*final)(void*, void*);
  51
  52         if (strcmp(filename, "-") == 0) {
  53                 src_fd = STDIN_FILENO;
  54         } else if(0 > (src_fd = open(filename, O_RDONLY))) {
  55                 bb_perror_msg("%s", filename);
  56                 return NULL;
  57         }
  58
  59         /* figure specific hash algorithims */
  60         if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
  61                 md5_begin(&context.md5);
  62                 update = (void (*)(const void*, size_t, void*))md5_hash;
  63                 final = (void (*)(void*, void*))md5_end;
  64                 hash_len = 16;
  65         } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
  66                 sha1_begin(&context.sha1);
  67                 update = (void (*)(const void*, size_t, void*))sha1_hash;
  68                 final = (void (*)(void*, void*))sha1_end;
  69                 hash_len = 20;
  70         } else {
  71                 bb_error_msg_and_die("algorithm not supported");
  72         }
  73
  74         while (0 < (count = read(src_fd, in_buf, 4096))) {
  75                 update(in_buf, count, &context);
  76         }
  77
  78         if (count == 0) {
  79                 final(in_buf, &context);
  80                 hash_value = hash_bin_to_hex(in_buf, hash_len);
  81         }
  82
  83         RELEASE_CONFIG_BUFFER(in_buf);
  84
  85         if (src_fd != STDIN_FILENO) {
  86                 close(src_fd);
  87         }
  88
  89         return hash_value;
  90 }
  91
  92 /* This could become a common function for md5 as well, by using md5_stream */
  93 static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
  94 {
  95         int return_value = EXIT_SUCCESS;
  96         uint8_t *hash_value;
  97         unsigned int flags;
  98
  99         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
 100                 flags = bb_getopt_ulflags(argc, argv, "scw");
 101
 102         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
 103                 if (flags & FLAG_SILENT) {
 104                         bb_error_msg_and_die
 105                                 ("the -s option is meaningful only when verifying checksums");
 106                 } else if (flags & FLAG_WARN) {
 107                         bb_error_msg_and_die
 108                                 ("the -w option is meaningful only when verifying checksums");
 109                 }
 110         }
 111
 112         if (argc == optind) {
 113                 argv[argc++] = "-";
 114         }
 115
 116         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && flags & FLAG_CHECK) {
 117                 FILE *pre_computed_stream;
 118                 int count_total = 0;
 119                 int count_failed = 0;
 120                 char *file_ptr = argv[optind];
 121                 char *line;
 122
 123                 if (optind + 1 != argc) {
 124                         bb_error_msg_and_die
 125                                 ("only one argument may be specified when using -c");
 126                 }
 127
 128                 if (strcmp(file_ptr, "-") == 0) {
 129                         pre_computed_stream = stdin;
 130                 } else {
 131                         pre_computed_stream = bb_xfopen(file_ptr, "r");
 132                 }
 133
 134                 while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) {
 135                         char *filename_ptr;
 136
 137                         count_total++;
 138                         filename_ptr = strstr(line, "  ");
 139                         if (filename_ptr == NULL) {
 140                                 if (flags & FLAG_WARN) {
 141                                         bb_error_msg("Invalid format");
 142                                 }
 143                                 count_failed++;
 144                                 return_value = EXIT_FAILURE;
 145                                 free(line);
 146                                 continue;
 147                         }
 148                         *filename_ptr = '\0';
 149                         filename_ptr += 2;
 150
 151                         hash_value = hash_file(filename_ptr, hash_algo);
 152
 153                         if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
 154                                 if (!(flags & FLAG_SILENT))
 155                                         printf("%s: OK\n", filename_ptr);
 156                         } else {
 157                                 if (!(flags & FLAG_SILENT))
 158                                         printf("%s: FAILED\n", filename_ptr);
 159                                 count_failed++;
 160                                 return_value = EXIT_FAILURE;
 161                         }
 162                         /* possible free(NULL) */
 163                         free(hash_value);
 164                         free(line);
 165                 }
 166                 if (count_failed && !(flags & FLAG_SILENT)) {
 167                         bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
 168                                                  count_failed, count_total);
 169                 }
 170                 if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
 171                         bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
 172                 }
 173         } else {
 174                 while (optind < argc) {
 175                         char *file_ptr = argv[optind++];
 176
 177                         hash_value = hash_file(file_ptr, hash_algo);
 178                         if (hash_value == NULL) {
 179                                 return_value = EXIT_FAILURE;
 180                         } else {
 181                                 printf("%s  %s\n", hash_value, file_ptr);
 182                                 free(hash_value);
 183                         }
 184                 }
 185         }
 186         return (return_value);
 187 }
 188
 189 #ifdef CONFIG_MD5SUM
 190 int md5sum_main(int argc, char **argv)
 191 {
 192         return (hash_files(argc, argv, HASH_MD5));
 193 }
 194 #endif
 195
 196 #ifdef CONFIG_SHA1SUM
 197 int sha1sum_main(int argc, char **argv)
 198 {
 199         return (hash_files(argc, argv, HASH_SHA1));
 200 }
 201 #endif