err.no Git - backuppcd/blob - backuppcd-passwd.c

   1 #include "compat.h"
   2 #include "lib/sha1.h"
   3 #include <stdio.h>
   4
   5 static char * sha1sum(char *string) {
   6         unsigned char digest[20];
   7         static char ret[(sizeof(digest) * 2) + 1] = {0};
   8         static char hexabet[] = "0123456789abcdef";
   9         struct sha1_ctx ctx;
  10         int retcnt = 0, i;
  11
  12         sha1_init_ctx(&ctx);
  13
  14         sha1_process_bytes(string, strlen(string), &ctx);
  15
  16         sha1_finish_ctx(&ctx, digest);
  17
  18         for (i = 0; i < sizeof(digest); i++) {
  19                 ret[retcnt++] = hexabet[(digest[i] & 0xf0) >> 4];
  20                 ret[retcnt++] = hexabet[digest[i] & 0xf];
  21         }
  22
  23         ret[retcnt] = '\0';
  24
  25         return(ret);
  26 }
  27
  28 int main(int argc, char **argv) {
  29         char *plaintext;
  30         char *fgets_ret;
  31         int fail_cnt = 0;
  32
  33         if (argc == 1) {
  34                 plaintext = malloc(1024);
  35                 if (!plaintext) {
  36                         perror("malloc");
  37                         return(EXIT_FAILURE);
  38                 }
  39
  40                 plaintext[0] = '\0';
  41
  42                 while (plaintext[0] == '\0' && fail_cnt < 3) {
  43                         printf("Password: ");
  44                         fflush(stdout);
  45
  46                         fgets_ret = fgets(plaintext, 1024, stdin);
  47                         if (!fgets_ret) {
  48                                 perror("fgets");
  49                                 return(EXIT_FAILURE);
  50                         }
  51
  52                         if (plaintext[strlen(plaintext) - 1] == '\n') {
  53                                 plaintext[strlen(plaintext) - 1] = '\0';
  54                         }
  55
  56                         fail_cnt++;
  57                 }
  58         } else if (argc > 1) {
  59                 plaintext = argv[1];
  60         } else {
  61                 return(EXIT_FAILURE);
  62         }
  63
  64         if (plaintext[0] == '\0') {
  65                 printf("Invalid password specified, aborting.\n");
  66                 exit(EXIT_FAILURE);
  67         }
  68
  69         printf("%s\n", sha1sum(plaintext));
  70
  71         return(EXIT_SUCCESS);
  72 }