contrib/id_to_fp.c

   1 /* Copyright 2006 Nick Mathewson; see LICENSE for licensing information */
   2
   3 /* id_to_fp.c : Helper for directory authority ops.  When somebody sends us
   4  * a private key, this utility converts the private key into a fingerprint
   5  * so you can de-list that fingerprint.
   6  */
   7
   8 #include <openssl/rsa.h>
   9 #include <openssl/bio.h>
  10 #include <openssl/sha.h>
  11 #include <openssl/pem.h>
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16
  17 #define die(s) do { fprintf(stderr, "%s\n", s); goto err; } while (0)
  18
  19 int
  20 main(int argc, char **argv)
  21 {
  22   BIO *b = NULL;
  23   RSA *key = NULL;
  24   unsigned char *buf = NULL, *bufp;
  25   int len, i;
  26   unsigned char digest[20];
  27   int status = 1;
  28
  29   if (argc < 2) {
  30     fprintf(stderr, "Reading key from stdin...\n");
  31     if (!(b = BIO_new_fp(stdin, BIO_NOCLOSE)))
  32       die("couldn't read from stdin");
  33   } else if (argc == 2) {
  34     if (strcmp(argv[1], "-h") == 0 ||
  35         strcmp(argv[1], "--help") == 0) {
  36       fprintf(stdout, "Usage: %s [keyfile]\n", argv[0]);
  37       status = 0;
  38       goto err;
  39     } else {
  40       if (!(b = BIO_new_file(argv[1], "r")))
  41         die("couldn't open file");
  42     }
  43   } else {
  44     fprintf(stderr, "Usage: %s [keyfile]\n", argv[0]);
  45     goto err;
  46   }
  47   if (!(key = PEM_read_bio_RSAPrivateKey(b, NULL, NULL, NULL)))
  48     die("couldn't parse key");
  49
  50   len = i2d_RSAPublicKey(key, NULL);
  51   if (len < 0)
  52     die("Bizarre key");
  53   bufp = buf = malloc(len+1);
  54   if (!buf)
  55     die("Out of memory");
  56   len = i2d_RSAPublicKey(key, &bufp);
  57   if (len < 0)
  58     die("Bizarre key");
  59
  60   SHA1(buf, len, digest);
  61   for (i=0; i < 20; i += 2) {
  62     printf("%02X%02X ", (int)digest[i], (int)digest[i+1]);
  63   }
  64   printf("\n");
  65
  66   status = 0;
  67
  68 err:
  69   if (buf)
  70     free(buf);
  71   if (key)
  72     RSA_free(key);
  73   if (b)
  74     BIO_free(b);
  75   return status;
  76 }
  77