84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* These are the utility functions shared by all demo programs.
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*/
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sodium.h>
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#include "utils.h"
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/* ================================================================== *
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* utility functions *
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* ================================================================== */
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/*
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* print_hex() is a wrapper around sodium_bin2hex() which allocates
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* temporary memory then immediately prints the result.
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*/
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void
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print_hex(const void *bin, const size_t bin_len)
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{
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char *hex;
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size_t hex_size;
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if (bin_len >= SIZE_MAX / 2) {
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abort();
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}
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hex_size = bin_len * 2 + 1;
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if ((hex = malloc(hex_size)) == NULL) {
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abort();
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}
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/* the library supplies a few utility functions like the one below */
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if (sodium_bin2hex(hex, hex_size, bin, bin_len) == NULL) {
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abort();
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}
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fputs(hex, stdout);
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free(hex);
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}
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/*
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* Display a prompt for input by user. It will save the input into a buffer
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* of a specific size with room for the null terminator while removing
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* trailing newline characters.
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*/
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size_t
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prompt_input(char *prompt, char *input, const size_t max_input_len)
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{
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size_t actual_input_len;
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fputs(prompt, stdout);
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fflush(stdout);
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fgets(input, max_input_len, stdin); /* grab input with room for \0 */
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actual_input_len = strlen(input);
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/* trim excess new line */
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if (actual_input_len > 0 && input[actual_input_len - 1] == '\n') {
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input[actual_input_len - 1] = '\0';
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--actual_input_len;
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}
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return actual_input_len;
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}
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/*
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* Display whether the function was sucessful or failed.
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*/
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void
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print_verification(int r)
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{
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if (r == 0)
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puts("Success\n");
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else
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puts("Failure\n");
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}
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void
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init(void)
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{
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sodium_init();
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printf("Using libsodium %s\n", sodium_version_string());
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}
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