1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Copyright (C) 2003 Glenn L. McGrath
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4 | * Copyright (C) 2003-2004 Erik Andersen
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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7 | */
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8 |
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9 | #include "libbb.h"
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10 |
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11 | /* This is a NOEXEC applet. Be very careful! */
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12 |
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13 | enum {
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14 | /* 4th letter of applet_name is... */
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15 | HASH_MD5 = 's', /* "md5>s<um" */
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16 | HASH_SHA1 = '1',
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17 | HASH_SHA256 = '2',
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18 | HASH_SHA512 = '5',
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19 | };
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20 |
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21 | #define FLAG_SILENT 1
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22 | #define FLAG_CHECK 2
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23 | #define FLAG_WARN 4
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24 |
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25 | /* This might be useful elsewhere */
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26 | static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
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27 | unsigned hash_length)
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28 | {
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29 | /* xzalloc zero-terminates */
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30 | char *hex_value = xzalloc((hash_length * 2) + 1);
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31 | bin2hex(hex_value, (char*)hash_value, hash_length);
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32 | return (unsigned char *)hex_value;
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33 | }
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34 |
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35 | static uint8_t *hash_file(const char *filename)
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36 | {
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37 | int src_fd, hash_len, count;
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38 | union _ctx_ {
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39 | sha512_ctx_t sha512;
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40 | sha256_ctx_t sha256;
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41 | sha1_ctx_t sha1;
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42 | md5_ctx_t md5;
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43 | } context;
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44 | uint8_t *hash_value = NULL;
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45 | RESERVE_CONFIG_UBUFFER(in_buf, 4096);
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46 | void FAST_FUNC (*update)(void*, const void*, size_t);
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47 | void FAST_FUNC (*final)(void*, void*);
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48 | char hash_algo;
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49 |
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50 | src_fd = open_or_warn_stdin(filename);
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51 | if (src_fd < 0) {
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52 | return NULL;
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53 | }
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54 |
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55 | hash_algo = applet_name[3];
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56 |
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57 | /* figure specific hash algorithims */
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58 | if (ENABLE_MD5SUM && hash_algo == HASH_MD5) {
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59 | md5_begin(&context.md5);
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60 | update = (void*)md5_hash;
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61 | final = (void*)md5_end;
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62 | hash_len = 16;
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63 | } else if (ENABLE_SHA1SUM && hash_algo == HASH_SHA1) {
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64 | sha1_begin(&context.sha1);
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65 | update = (void*)sha1_hash;
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66 | final = (void*)sha1_end;
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67 | hash_len = 20;
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68 | } else if (ENABLE_SHA256SUM && hash_algo == HASH_SHA256) {
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69 | sha256_begin(&context.sha256);
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70 | update = (void*)sha256_hash;
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71 | final = (void*)sha256_end;
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72 | hash_len = 32;
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73 | } else if (ENABLE_SHA512SUM && hash_algo == HASH_SHA512) {
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74 | sha512_begin(&context.sha512);
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75 | update = (void*)sha512_hash;
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76 | final = (void*)sha512_end;
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77 | hash_len = 64;
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78 | } else {
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79 | xfunc_die(); /* can't reach this */
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80 | }
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81 |
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82 | while ((count = safe_read(src_fd, in_buf, 4096)) > 0) {
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83 | update(&context, in_buf, count);
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84 | }
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85 |
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86 | if (count == 0) {
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87 | final(&context, in_buf);
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88 | hash_value = hash_bin_to_hex(in_buf, hash_len);
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89 | }
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90 |
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91 | RELEASE_CONFIG_BUFFER(in_buf);
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92 |
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93 | if (src_fd != STDIN_FILENO) {
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94 | close(src_fd);
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95 | }
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96 |
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97 | return hash_value;
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98 | }
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99 |
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100 | int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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101 | int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
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102 | {
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103 | int return_value = EXIT_SUCCESS;
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104 | unsigned flags;
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105 |
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106 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) {
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107 | /* -b "binary", -t "text" are ignored (shaNNNsum compat) */
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108 | flags = getopt32(argv, "scwbt");
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109 | argv += optind;
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110 | //argc -= optind;
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111 | } else {
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112 | argv += 1;
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113 | //argc -= 1;
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114 | }
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115 | if (!*argv)
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116 | *--argv = (char*)"-";
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117 |
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118 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
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119 | if (flags & FLAG_SILENT) {
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120 | bb_error_msg_and_die("-%c is meaningful only with -c", 's');
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121 | }
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122 | if (flags & FLAG_WARN) {
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123 | bb_error_msg_and_die("-%c is meaningful only with -c", 'w');
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124 | }
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125 | }
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126 |
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127 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
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128 | FILE *pre_computed_stream;
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129 | int count_total = 0;
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130 | int count_failed = 0;
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131 | char *line;
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132 |
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133 | if (argv[1]) {
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134 | bb_error_msg_and_die("only one argument may be specified with -c");
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135 | }
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136 |
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137 | pre_computed_stream = xfopen_stdin(argv[0]);
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138 |
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139 | while ((line = xmalloc_fgetline(pre_computed_stream)) != NULL) {
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140 | uint8_t *hash_value;
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141 | char *filename_ptr;
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142 |
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143 | count_total++;
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144 | filename_ptr = strstr(line, " ");
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145 | /* handle format for binary checksums */
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146 | if (filename_ptr == NULL) {
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147 | filename_ptr = strstr(line, " *");
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148 | }
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149 | if (filename_ptr == NULL) {
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150 | if (flags & FLAG_WARN) {
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151 | bb_error_msg("invalid format");
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152 | }
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153 | count_failed++;
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154 | return_value = EXIT_FAILURE;
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155 | free(line);
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156 | continue;
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157 | }
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158 | *filename_ptr = '\0';
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159 | filename_ptr += 2;
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160 |
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161 | hash_value = hash_file(filename_ptr);
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162 |
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163 | if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
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164 | if (!(flags & FLAG_SILENT))
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165 | printf("%s: OK\n", filename_ptr);
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166 | } else {
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167 | if (!(flags & FLAG_SILENT))
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168 | printf("%s: FAILED\n", filename_ptr);
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169 | count_failed++;
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170 | return_value = EXIT_FAILURE;
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171 | }
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172 | /* possible free(NULL) */
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173 | free(hash_value);
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174 | free(line);
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175 | }
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176 | if (count_failed && !(flags & FLAG_SILENT)) {
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177 | bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
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178 | count_failed, count_total);
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179 | }
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180 | /*
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181 | if (fclose_if_not_stdin(pre_computed_stream) == EOF) {
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182 | bb_perror_msg_and_die("can't close file %s", file_ptr);
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183 | }
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184 | */
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185 | } else {
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186 | do {
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187 | uint8_t *hash_value = hash_file(*argv);
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188 | if (hash_value == NULL) {
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189 | return_value = EXIT_FAILURE;
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190 | } else {
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191 | printf("%s %s\n", hash_value, *argv);
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192 | free(hash_value);
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193 | }
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194 | } while (*++argv);
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195 | }
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196 | return return_value;
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197 | }
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