291 lines
8.2 KiB
C
291 lines
8.2 KiB
C
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/*
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* Written by Daniel Richards <kyhwana@world-net.co.nz> 6/7/2002
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* hash.c: This app uses libtomcrypt to hash either stdin or a file
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* This file is Public Domain. No rights are reserved.
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* Compile with 'gcc hashsum.c -o hashsum -ltomcrypt'
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* This example isn't really big enough to warrent splitting into
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* more functions ;)
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*/
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#include <tomcrypt.h>
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L
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#include <libgen.h>
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#else
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#define basename(x) x
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#endif
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#if !defined(PATH_MAX) && defined(_MSC_VER)
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#include <windows.h>
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#define PATH_MAX MAX_PATH
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#endif
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/* thanks http://stackoverflow.com/a/8198009 */
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#define s_base(x) ((x >= '0' && x <= '9') ? '0' : \
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(x >= 'a' && x <= 'f') ? 'a' - 10 : \
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(x >= 'A' && x <= 'F') ? 'A' - 10 : \
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'\255')
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#define HEXOF(x) (x - s_base(x))
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static char* hashsum;
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static void cleanup(void)
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{
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free(hashsum);
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}
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static void die(int status)
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{
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unsigned long w, x;
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FILE* o = status == EXIT_SUCCESS ? stdout : stderr;
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fprintf(o, "usage: %s -a algorithm [-c] [file...]\n\n", hashsum);
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fprintf(o, "\t-c\tCheck the hash(es) of the file(s) written in [file].\n");
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fprintf(o, "\t\t(-a not required)\n");
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fprintf(o, "\nAlgorithms:\n\t");
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w = 0;
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for (x = 0; hash_descriptor[x].name != NULL; x++) {
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w += fprintf(o, "%-14s", hash_descriptor[x].name);
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if (w >= 70) {
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fprintf(o, "\n\t");
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w = 0;
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}
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}
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if (w != 0) fprintf(o, "\n");
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exit(status);
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}
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static void printf_hex(unsigned char* hash_buffer, unsigned long w)
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{
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unsigned long x;
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for (x = 0; x < w; x++) {
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printf("%02x",hash_buffer[x]);
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}
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}
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static void check_file(int argn, int argc, char **argv)
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{
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int err, failed, invalid;
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unsigned char is_buffer[MAXBLOCKSIZE], should_buffer[MAXBLOCKSIZE];
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char buf[PATH_MAX + (MAXBLOCKSIZE * 3)];
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/* iterate through all files */
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while(argn < argc) {
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char* s;
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FILE* f = fopen(argv[argn], "rb");
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if(f == NULL) {
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int n = snprintf(buf, sizeof(buf), "%s: %s", hashsum, argv[argn]);
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if (n > 0 && n < (int)sizeof(buf))
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perror(buf);
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else
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perror(argv[argn]);
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exit(EXIT_FAILURE);
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}
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failed = 0;
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invalid = 0;
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/* read the file line by line */
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while((s = fgets(buf, sizeof(buf), f)) != NULL)
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{
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int tries, n;
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unsigned long hash_len, w, x;
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char* space = strstr(s, " ");
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/* skip lines with comments */
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if (buf[0] == '#') continue;
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if (space == NULL) {
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fprintf(stderr, "%s: no properly formatted checksum lines found\n", hashsum);
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goto ERR;
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}
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hash_len = space - s;
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hash_len /= 2;
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if (hash_len > sizeof(should_buffer)) {
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fprintf(stderr, "%s: hash too long\n", hashsum);
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goto ERR;
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}
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/* convert the hex-string back to binary */
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for (x = 0; x < hash_len; ++x) {
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should_buffer[x] = HEXOF(s[x*2]) << 4 | HEXOF(s[x*2 + 1]);
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}
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space++;
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if (*space != '*') {
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fprintf(stderr, "%s: unsupported input mode '%c'\n", hashsum, *space);
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goto ERR;
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}
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space++;
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for (n = 0; n < (buf + sizeof(buf)) - space; ++n) {
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if(iscntrl((int)space[n])) {
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space[n] = '\0';
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break;
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}
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}
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/* try all hash algorithms that have the appropriate hash size */
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tries = 0;
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for (x = 0; hash_descriptor[x].name != NULL; ++x) {
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if (hash_descriptor[x].hashsize == hash_len) {
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tries++;
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w = sizeof(is_buffer);
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if ((err = hash_file(x, space, is_buffer, &w)) != CRYPT_OK) {
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fprintf(stderr, "%s: File hash error: %s: %s\n", hashsum, space, error_to_string(err));
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ERR:
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fclose(f);
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exit(EXIT_FAILURE);
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}
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if(XMEMCMP(should_buffer, is_buffer, w) == 0) {
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printf("%s: OK\n", space);
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break;
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}
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}
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} /* for */
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if (hash_descriptor[x].name == NULL) {
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if(tries > 0) {
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printf("%s: FAILED\n", space);
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failed++;
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}
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else {
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invalid++;
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}
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}
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} /* while */
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fclose(f);
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if(invalid) {
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fprintf(stderr, "%s: WARNING: %d %s is improperly formatted\n", hashsum, invalid, invalid > 1?"lines":"line");
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}
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if(failed) {
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fprintf(stderr, "%s: WARNING: %d computed %s did NOT match\n", hashsum, failed, failed > 1?"checksums":"checksum");
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}
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argn++;
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}
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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int idxs[TAB_SIZE], idx, check, y, z, err, argn;
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unsigned long w, x;
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unsigned char hash_buffer[MAXBLOCKSIZE];
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hashsum = strdup(basename(argv[0]));
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atexit(cleanup);
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/* You need to register algorithms before using them */
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register_all_ciphers();
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register_all_hashes();
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if (argc > 1 && (strcmp("-h", argv[1]) == 0 || strcmp("--help", argv[1]) == 0)) {
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die(EXIT_SUCCESS);
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}
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if (argc < 3) {
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die(EXIT_FAILURE);
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}
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for (x = 0; x < sizeof(idxs)/sizeof(idxs[0]); ++x) {
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idxs[x] = -2;
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}
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argn = 1;
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check = 0;
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idx = 0;
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while(argn < argc){
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if(strcmp("-a", argv[argn]) == 0) {
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argn++;
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if(argn < argc) {
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idxs[idx] = find_hash(argv[argn]);
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if (idxs[idx] == -1) {
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struct {
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const char* is;
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const char* should;
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} shasum_compat[] =
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{
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#ifdef LTC_SHA1
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{ "1", sha1_desc.name },
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#endif
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#ifdef LTC_SHA224
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{ "224", sha224_desc.name },
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#endif
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#ifdef LTC_SHA256
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{ "256", sha256_desc.name },
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#endif
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#ifdef LTC_SHA384
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{ "384", sha384_desc.name },
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#endif
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#ifdef LTC_SHA512
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{ "512", sha512_desc.name },
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#endif
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#ifdef LTC_SHA512_224
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{ "512224", sha512_224_desc.name },
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#endif
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#ifdef LTC_SHA512_256
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{ "512256", sha512_256_desc.name },
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#endif
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{ NULL, NULL }
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};
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for (x = 0; shasum_compat[x].is != NULL; ++x) {
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if(XSTRCMP(shasum_compat[x].is, argv[argn]) == 0) {
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idxs[idx] = find_hash(shasum_compat[x].should);
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break;
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}
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}
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}
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if (idxs[idx] == -1) {
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fprintf(stderr, "%s: Unrecognized algorithm\n", hashsum);
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die(EXIT_FAILURE);
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}
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idx++;
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if ((size_t)idx >= sizeof(idxs)/sizeof(idxs[0])) {
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fprintf(stderr, "%s: Too many '-a' options chosen\n", hashsum);
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die(EXIT_FAILURE);
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}
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argn++;
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continue;
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}
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else {
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die(EXIT_FAILURE);
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}
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}
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if(strcmp("-c", argv[argn]) == 0) {
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check = 1;
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argn++;
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continue;
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}
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break;
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}
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if (check == 1) {
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check_file(argn, argc, argv);
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}
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if (argc == argn) {
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w = sizeof(hash_buffer);
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if ((err = hash_filehandle(idxs[0], stdin, hash_buffer, &w)) != CRYPT_OK) {
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fprintf(stderr, "%s: File hash error: %s\n", hashsum, error_to_string(err));
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return EXIT_FAILURE;
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} else {
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for (x = 0; x < w; x++) {
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printf("%02x",hash_buffer[x]);
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}
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printf(" *-\n");
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}
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} else {
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for (z = argn; z < argc; z++) {
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for (y = 0; y < idx; ++y) {
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w = sizeof(hash_buffer);
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if ((err = hash_file(idxs[y],argv[z],hash_buffer,&w)) != CRYPT_OK) {
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fprintf(stderr, "%s: File hash error: %s\n", hashsum, error_to_string(err));
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return EXIT_FAILURE;
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} else {
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printf_hex(hash_buffer, w);
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printf(" *%s\n", argv[z]);
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}
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}
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}
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}
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return EXIT_SUCCESS;
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}
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