/* See LICENSE file for copyright and license details. */ #include "common.h" #include "arg.h" #include #include #include #include #include #include #include #include #include /** * Storage for binary hash */ static void *restrict hashsum = NULL; /** * Storage for hexadecimal hash */ static char *restrict hexsum = NULL; /** * `argv[0]` from `main` */ char *argv0; static void usage(void) { fprintf(stderr, "usage: %s [-u | -l | -b | -c] [-R rate] [-C capacity] " "[-N output-size] [-S state-size] [-W word-size] " "[-Z squeeze-count] [-vxz] [file ...]\n", argv0); exit(2); } static void user_error(const char *text) { fprintf(stderr, "%s: %s\n", argv0, text); exit(2); } static void * emalloc(size_t n) { void *r = malloc(n); if (!r) { perror(argv0); exit(2); } return r; } static void * erealloc(void *ptr, size_t n) { if (!(ptr = realloc(ptr, n))) { perror(argv0); exit(2); } return ptr; } static void eperror(void) { perror(argv0); exit(2); } /** * Convert `struct libkeccak_generalised_spec` to `struct libkeccak_spec` and check for errors * * @param gspec See libkeccak_degeneralise_spec(3) * @param spec See libkeccak_degeneralise_spec(3) */ static void make_spec(struct libkeccak_generalised_spec *restrict gspec, struct libkeccak_spec *restrict spec) { #define case /* fall through */ case #define default /* fall through */ default #define TEST(CASE, STR) case LIBKECCAK_GENERALISED_SPEC_ERROR_##CASE: user_error(STR) switch (libkeccak_degeneralise_spec(gspec, spec)) { case 0: break; TEST (STATE_NONPOSITIVE, "the state size must be positive"); TEST (STATE_TOO_LARGE, "the state size is too large, may not exceed 1600"); TEST (STATE_MOD_25, "the state size must be a multiple of 25"); TEST (WORD_NONPOSITIVE, "the word size must be positive"); TEST (WORD_TOO_LARGE, "the word size is too large, may not exceed 64"); TEST (STATE_WORD_INCOHERENCY, "the state size must be exactly 25 times the word size"); TEST (CAPACITY_NONPOSITIVE, "the capacity must be positive"); TEST (CAPACITY_MOD_8, "the capacity must be a multiple of 8"); TEST (BITRATE_NONPOSITIVE, "the rate must be positive"); TEST (BITRATE_MOD_8, "the rate must be a multiple of 8"); TEST (OUTPUT_NONPOSITIVE, "the output size must be positive"); default: user_error("unknown error in algorithm parameters"); } #undef TEST #define TEST(CASE, STR) case LIBKECCAK_SPEC_ERROR_##CASE: user_error(STR) switch (libkeccak_spec_check(spec)) { case 0: break; TEST (BITRATE_NONPOSITIVE, "the rate size must be positive"); TEST (BITRATE_MOD_8, "the rate must be a multiple of 8"); TEST (CAPACITY_NONPOSITIVE, "the capacity must be positive"); TEST (CAPACITY_MOD_8, "the capacity must be a multiple of 8"); TEST (OUTPUT_NONPOSITIVE, "the output size must be positive"); TEST (STATE_TOO_LARGE, "the state size is too large, may not exceed 1600"); TEST (STATE_MOD_25, "the state size must be a multiple of 25"); TEST (WORD_NON_2_POTENT, "the word size must be a power of 2"); TEST (WORD_MOD_8, "the word size must be a multiple of 8"); default: user_error("unknown error in algorithm parameters"); } #undef TEST #undef default #undef case } /** * Calculate a Keccak-family hashsum of a file, * the content of the file is assumed non-sensitive * * @param fd The file descriptor of the file to hash * @param state The hashing state, should not be initialised (memory leak otherwise) * @param spec Specifications for the hashing algorithm * @param suffix The data suffix, see `libkeccak_digest` * @param hash Output array for the hashsum, have an allocation size of * at least `(spec->output / 8) * sizeof(char)`, may be `NULL` * @return Zero on success, -1 on error */ static int generalised_sum_fd_hex(int fd, struct libkeccak_state *restrict state, const struct libkeccak_spec *restrict spec, const char *restrict suffix, void *restrict hash) { ssize_t got; struct stat attr; size_t blksize = 4096, r, w; unsigned char *restrict chunk; unsigned char even = 1, buf = 0, c; if (libkeccak_state_initialise(state, spec) < 0) return -1; if (!fstat(fd, &attr) && attr.st_blksize > 0) blksize = (size_t)(attr.st_blksize); chunk = alloca(blksize); for (;;) { got = read(fd, chunk, blksize); if (got < 0) return -1; if (!got) break; r = w = 0; while (r < (size_t)got) { c = chunk[r++]; if (isxdigit(c)) { buf = (unsigned char)((buf << 4) | ((c & 15) + (c > '9' ? 9 : 0))); if ((even ^= 1)) chunk[w++] = buf; } else if (!isspace(c)) { user_error("file is malformated"); } } if (libkeccak_fast_update(state, chunk, w) < 0) return -1; } if (!even) user_error("file is malformated"); return libkeccak_fast_digest(state, NULL, 0, 0, suffix, hash); } /** * Calculate the checksum of a file and store it in the global variable `hashsum` * * @param filename The file to hash * @param spec Hashing parameters * @param squeezes The number of squeezes to perform * @param suffix The message suffix * @param hex Whether to use hexadecimal input rather than binary * @return An appropriate exit value */ static int hash(const char *restrict filename, const struct libkeccak_spec *restrict spec, long int squeezes, const char *restrict suffix, int hex) { static size_t length = 0; struct libkeccak_state state; int fd; if (!length) { length = (size_t)((spec->output + 7) / 8); hashsum = emalloc(length * sizeof(char)); hexsum = emalloc((length * 2 + 1) * sizeof(char)); } filename = strcmp(filename, "-") ? filename : "/dev/stdin"; fd = open(filename, O_RDONLY); if (fd < 0) { if (errno == ENOENT) return 1; eperror(); } if ((hex ? generalised_sum_fd_hex : libkeccak_generalised_sum_fd) (fd, &state, spec, suffix, squeezes > 1 ? NULL : hashsum)) eperror(); close(fd); if (squeezes > 2) libkeccak_fast_squeeze(&state, squeezes - 2); if (squeezes > 1) libkeccak_squeeze(&state, hashsum); libkeccak_state_fast_destroy(&state); return 0; } /** * Check that file has a reported checksum, `bad_found` will be * updated if the file is missing or incorrect * * @param spec Hashing parameters * @param squeezes The number of squeezes to perform * @param suffix The message suffix * @param hex Whether to use hexadecimal input rather than binary * @param filename The file to check * @param correct_hash The expected checksum (any form of hexadecimal) * @return An appropriate exit value */ static int check(const struct libkeccak_spec *restrict spec, long int squeezes, const char *restrict suffix, int hex, const char *restrict filename, const char *restrict correct_hash) { size_t length = (size_t)((spec->output + 7) / 8); if (access(filename, F_OK) || hash(filename, spec, squeezes, suffix, hex)) { printf("%s: Missing\n", filename); return 1; } libkeccak_unhex(hexsum, correct_hash); if (memcmp(hexsum, hashsum, length)) { printf("%s: Fail\n", filename); return 1; } else { printf("%s: OK\n", filename); return 0; } } /** * Check checksums from a file * * @param filename The file to hash * @param spec Hashing parameters * @param squeezes The number of squeezes to perform * @param suffix The message suffix * @param style (unused) * @param hex Whether to use hexadecimal input rather than binary * @param nuls Whether lines end with NUL instead of LF, * and parsing should be less lax * @return An appropriate exit value */ static int check_checksums(const char *restrict filename, const struct libkeccak_spec *restrict spec, long int squeezes, const char *restrict suffix, enum representation style, int hex, int nuls) { struct stat attr; size_t blksize = 4096; size_t size = 4096; size_t ptr = 0; ssize_t got; char *buf; int fd = -1; int ret = 0; int stage; size_t hash_start = 0, hash_end = 0; size_t file_start = 0, file_end = 0; char *hash; char *file; size_t hash_n; char c; fd = open(strcmp(filename, "-") ? filename : "/dev/stdin", O_RDONLY); if (fd < 0) eperror(); if (!fstat(fd, &attr)) { if (attr.st_blksize > 0) blksize = (size_t)(attr.st_blksize); if (attr.st_size > 0) size = (size_t)(attr.st_size); } size = size > blksize ? size : blksize; buf = emalloc(size); for (;;) { if (ptr + blksize < size) buf = erealloc(buf, size <<= 1); got = read(fd, buf + ptr, blksize); if (got < 0) eperror(); if (!got) break; ptr += (size_t)got; } if (ptr == size) buf = erealloc(buf, size + 1); size = ptr; close(fd), fd = -1; buf[size++] = nuls ? '\0' : '\n'; for (ptr = 0, stage = 0; ptr < size; ptr++) { c = buf[ptr]; if (!nuls) { if (stage == 0) { if (isxdigit(c)) ; else if (c == ' ' || c == '\t') hash_end = ptr, stage++; else if (c == '\n' || c == '\f' || c == '\r') hash_end = ptr, stage = 3; else user_error("file is malformated"); } else if (stage == 1) { if (c == '\n' || c == '\f' || c == '\r') stage = 3; else if (c != ' ' && c != '\t') file_start = ptr, stage++; } else if (stage == 2) { if (c == '\n' || c == '\f' || c == '\r') file_end = ptr, stage++; } } else { if (stage == 0) { if (c == ' ') hash_end = ptr, stage++; else if (c == '\0') hash_end = ptr, stage = 3; else if (!isxdigit(c)) user_error("file is malformated"); } else if (stage == 1) { if (c == ' ') file_start = ptr + 1, stage++; else user_error("file is malformated"); } else if (stage == 2) { if (c == '\0') file_end = ptr, stage++; } } if (stage == 3) { if ((hash_start == hash_end) != (file_start == file_end)) user_error("file is malformated"); if (hash_start != hash_end) { hash = buf + hash_start; file = buf + file_start; hash_n = hash_end - hash_start; buf[hash_end] = '\0'; buf[file_end] = '\0'; if (hash_n % 2) user_error("file is malformated"); if (hash_n / 2 != (size_t)((spec->output + 7) / 8)) user_error("algorithm parameter mismatch"); ret |= check(spec, squeezes, suffix, hex, file, hash); } stage = 0; hash_start = hash_end = file_start = file_end = ptr + 1; } } if (stage) user_error("file is malformated"); free(buf); close(fd); return ret; (void) style; } /** * Print the checksum of a file * * @param filename The file to hash * @param spec Hashing parameters * @param squeezes The number of squeezes to perform * @param suffix The message suffix * @param style How the hashes shall be represented * @param hex Whether to use hexadecimal input rather than binary * @param nuls Whether lines end with NUL instead of LF * @return An appropriate exit value */ static int print_checksum(const char *restrict filename, const struct libkeccak_spec *restrict spec, long int squeezes, const char *restrict suffix, enum representation style, int hex, int nuls) { size_t p = 0, n = (size_t)((spec->output + 7) / 8); ssize_t w; if (hash(filename, spec, squeezes, suffix, hex)) { fprintf(stderr, "%s: %s: %s\n", argv0, filename, strerror(errno)); return 1; } if (style == REPRESENTATION_UPPER_CASE) { libkeccak_behex_upper(hexsum, hashsum, n); printf("%s %s%c", hexsum, filename, nuls ? '\0' : '\n'); } else if (style == REPRESENTATION_LOWER_CASE) { libkeccak_behex_lower(hexsum, hashsum, n); printf("%s %s%c", hexsum, filename, nuls ? '\0' : '\n'); } else { fflush(stdout); for (; p < n; p += (size_t)w) if ((w = write(STDOUT_FILENO, &((unsigned char *)hashsum)[p], n - p)) < 0) eperror(); } return 0; } /** * Parse the command line and calculate the hashes of the selected files * * @param argc The first argument from `main` * @param argv The second argument from `main` * @param gspec The default algorithm parameters * @param suffix Message suffix * @param with_a Whether the -a option should be recognised (but ignored) * @return An appropriate exit value */ int run(int argc, char *argv[], struct libkeccak_generalised_spec *restrict gspec, const char *restrict suffix, int with_a) { enum representation style = REPRESENTATION_UPPER_CASE; int verbose = 0, hex = 0, check = 0, nuls = 0; long int squeezes = 1; int (*fun)(const char *restrict filename, const struct libkeccak_spec *restrict spec, long int squeezes, const char *restrict suffix, enum representation style, int hex, int nuls); struct libkeccak_spec spec; int r = 0; /* Note: when options are added or removed, also update sha3sum.c */ ARGBEGIN { case 'R': gspec->bitrate = atol(EARGF(usage())); break; case 'C': gspec->capacity = atol(EARGF(usage())); break; case 'N': case 'O': gspec->output = atol(EARGF(usage())); break; case 'S': case 'B': gspec->state_size = atol(EARGF(usage())); break; case 'W': gspec->word_size = atol(EARGF(usage())); break; case 'Z': squeezes = atol(EARGF(usage())); break; case 'u': style = REPRESENTATION_UPPER_CASE; break; case 'l': style = REPRESENTATION_LOWER_CASE; break; case 'b': style = REPRESENTATION_BINARY; break; case 'c': check = 1; break; case 'v': verbose = 1; break; case 'x': hex = 1; break; case 'z': nuls = 1; break; case 'a': if (!with_a) usage(); (void) EARGF(usage()); break; default: usage(); } ARGEND; /* -cz has been added because the sha1sum, sha256sum, &c have * it, but I ignore the other crap, mostly because not all * implemention have them and binary vs text mode is stupid. */ fun = check ? check_checksums : print_checksum; make_spec(gspec, &spec); if (squeezes <= 0) user_error("the squeeze count most be positive"); if (verbose) { fprintf(stderr, "rate: %li\n", gspec->bitrate); fprintf(stderr, "capacity: %li\n", gspec->capacity); fprintf(stderr, "output size: %li\n", gspec->output); fprintf(stderr, "state size: %li\n", gspec->state_size); fprintf(stderr, "word size: %li\n", gspec->word_size); fprintf(stderr, "squeezes: %li\n", squeezes); fprintf(stderr, "suffix: %s\n", suffix ? suffix : ""); } if (!*argv) r = fun("-", &spec, squeezes, suffix, style, hex, nuls); for (; *argv; argv++) r |= fun(*argv, &spec, squeezes, suffix, style, hex, nuls); free(hashsum); free(hexsum); return r; }