diff options
Diffstat (limited to 'src/common.c')
| -rw-r--r-- | src/common.c | 96 |
1 files changed, 71 insertions, 25 deletions
diff --git a/src/common.c b/src/common.c index a30c4a5..0826996 100644 --- a/src/common.c +++ b/src/common.c @@ -60,6 +60,11 @@ static char* restrict hashsum = NULL; static char* restrict hexsum = NULL; /** + * Storage for binary version of expected checksum + */ +#define correct_binary hexsum + +/** * Whether a mismatch has been found or if a file was missing */ static int bad_found = 0; @@ -194,6 +199,49 @@ static int make_spec(libkeccak_generalised_spec_t* restrict gspec, libkeccak_spe /** + * 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 Zero on success, an appropriate exit value on error + */ +static int hash(const char* restrict filename, const libkeccak_spec_t* restrict spec, + long squeezes, const char* restrict suffix, int hex) +{ + libkeccak_state_t state; + size_t length; + int r, fd; + + length = (size_t)((spec->output + 7) / 8); + + if (hashsum == NULL) + if (hashsum = malloc(length * sizeof(char)), hashsum == NULL) + return perror(execname), 2; + + if (hexsum == NULL) + if (hexsum = malloc((length * 2 + 1) * sizeof(char)), hexsum == NULL) + return perror(execname), 2; + + if (fd = open(strcmp(filename, "-") ? filename : STDIN_PATH, O_RDONLY), fd < 0) + return r = (errno != ENOENT), perror(execname), r + 1; + + if ((hex == 0 ? libkeccak_generalised_sum_fd : generalised_sum_fd_hex) + (fd, &state, spec, suffix, squeezes > 1 ? NULL : hashsum)) + return perror(execname), close(fd), libkeccak_state_fast_destroy(&state), 2; + 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 * @@ -208,7 +256,25 @@ static int make_spec(libkeccak_generalised_spec_t* restrict gspec, libkeccak_spe static int check(const libkeccak_spec_t* restrict spec, long squeezes, const char* restrict suffix, int hex, const char* restrict filename, const char* restrict correct_hash) { - return 0; /* TODO */ + size_t length = (size_t)((spec->output + 7) / 8); + int r; + + if (access(filename, F_OK)) + { + bad_found = 1; + printf("%s: %s\n", filename, "Missing"); + return 0; + } + + if ((r = hash(filename, spec, squeezes, suffix, hex))) + return r; + + libkeccak_unhex(correct_binary, correct_hash); + if ((r = memcmp(correct_binary, hashsum, length))) + bad_found = 1; + printf("%s: %s\n", filename, r ? "OK" : "Fail"); + + return 0; } @@ -376,31 +442,11 @@ static int check_checksums(const char* restrict filename, const libkeccak_spec_t static int print_checksum(const char* restrict filename, const libkeccak_spec_t* restrict spec, long squeezes, const char* restrict suffix, int representation, int hex) { - libkeccak_state_t state; - int r, fd; - size_t length; - - length = (size_t)((spec->output + 7) / 8); - - if (hashsum == NULL) - if (hashsum = malloc(length * sizeof(char)), hashsum == NULL) - return perror(execname), 2; - - if ((hexsum == NULL) && (representation != REPRESENTATION_BINARY)) - if (hexsum = malloc((length * 2 + 1) * sizeof(char)), hexsum == NULL) - return perror(execname), 2; - - if (fd = open(strcmp(filename, "-") ? filename : STDIN_PATH, O_RDONLY), fd < 0) - return r = (errno != ENOENT), perror(execname), r + 1; - - if ((hex == 0 ? libkeccak_generalised_sum_fd : generalised_sum_fd_hex) - (fd, &state, spec, suffix, squeezes > 1 ? NULL : hashsum)) - return perror(execname), close(fd), libkeccak_state_fast_destroy(&state), 2; - close(fd); + size_t length = (size_t)((spec->output + 7) / 8); + int r; - if (squeezes > 2) libkeccak_fast_squeeze(&state, squeezes - 2); - if (squeezes > 1) libkeccak_squeeze(&state, hashsum); - libkeccak_state_fast_destroy(&state); + if ((r = hash(filename, spec, squeezes, suffix, hex))) + return r; if (representation == REPRESENTATION_UPPER_CASE) { |