78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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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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/**
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@file demo_crypt_constants.c
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Demo how to get various constants to dynamic languages
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like Python
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Larry Bugbee, February 2013
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*/
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static void s_print_line(const char* cmd, const char* desc)
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{
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printf(" %-16s - %s\n", cmd, desc);
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}
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int main(int argc, char **argv)
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{
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if (argc == 1) {
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/* given a specific constant name, get and print its value */
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char name[] = "CTR_COUNTER_BIG_ENDIAN";
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int value;
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char *names_list;
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unsigned int names_list_len;
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if (crypt_get_constant(name, &value) != 0) exit(EXIT_FAILURE);
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printf("\n %s is %d \n\n", name, value);
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/* get and print the length of the names (and values) list */
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if (crypt_list_all_constants(NULL, &names_list_len) != 0) exit(EXIT_FAILURE);
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printf(" need to allocate %u bytes \n\n", names_list_len);
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/* get and print the names (and values) list */
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if ((names_list = malloc(names_list_len)) == NULL) exit(EXIT_FAILURE);
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if (crypt_list_all_constants(names_list, &names_list_len) != 0) exit(EXIT_FAILURE);
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printf(" supported constants:\n\n%s\n\n", names_list);
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free(names_list);
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} else if (argc == 2) {
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if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
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char* base = strdup(basename(argv[0]));
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printf("Usage: %s [-a] [-s name]\n\n", base);
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s_print_line("<no argument>", "The old behavior of the demo");
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s_print_line("-a", "Only lists all constants");
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s_print_line("-s name", "List a single constant given as argument");
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s_print_line("-h", "The help you're looking at");
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free(base);
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} else if (strcmp(argv[1], "-a") == 0) {
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char *names_list;
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unsigned int names_list_len;
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/* get and print the length of the names (and values) list */
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if (crypt_list_all_constants(NULL, &names_list_len) != 0) exit(EXIT_FAILURE);
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/* get and print the names (and values) list */
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if ((names_list = malloc(names_list_len)) == NULL) exit(EXIT_FAILURE);
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if (crypt_list_all_constants(names_list, &names_list_len) != 0) exit(EXIT_FAILURE);
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printf("%s\n", names_list);
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free(names_list);
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}
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} else if (argc == 3) {
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if (strcmp(argv[1], "-s") == 0) {
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int value;
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if (crypt_get_constant(argv[2], &value) != 0) exit(EXIT_FAILURE);
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printf("%s,%u\n", argv[2], value);
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}
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}
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return 0;
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}
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