107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* Utility functions shared by all the demo programs.
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*/
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#ifndef UTILS_H
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#define UTILS_H
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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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#define MAX_INPUT_LEN 4096
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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 followed by \n
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*/
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static 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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puts(hex);
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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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static size_t
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prompt_input(const char *prompt, char *input, const size_t max_input_len,
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int variable_length)
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{
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char input_tmp[MAX_INPUT_LEN + 1U];
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size_t actual_input_len;
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if (variable_length != 0) {
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printf("\nEnter %s (%zu bytes max) > ", prompt, max_input_len);
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} else {
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printf("\nEnter %s (%zu bytes) > ", prompt, max_input_len);
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}
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fflush(stdout);
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fgets(input_tmp, sizeof input_tmp, stdin);
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actual_input_len = strlen(input_tmp);
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/* trim \n */
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if (actual_input_len > 0 && input_tmp[actual_input_len - 1] == '\n') {
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input_tmp[actual_input_len - 1] = '\0';
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--actual_input_len;
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}
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if (actual_input_len > max_input_len) {
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printf("Warning: truncating input to %zu bytes\n\n", max_input_len);
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actual_input_len = max_input_len;
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} else if (actual_input_len < max_input_len && variable_length == 0) {
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printf("Warning: %zu bytes expected, %zu bytes given: padding with zeros\n\n",
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max_input_len, actual_input_len);
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memset(input, 0, max_input_len);
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} else {
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printf("Length: %zu bytes\n\n", actual_input_len);
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}
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memcpy(input, input_tmp, actual_input_len);
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if (variable_length == 0) {
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return max_input_len;
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} else {
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return actual_input_len;
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}
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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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static void
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print_verification(int ret)
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{
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if (ret == 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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static 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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#endif /* UTILS_H */
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