src/tools/tor-checkkey.c

   1
   2 #define CRYPTO_PRIVATE
   3
   4 #include "orconfig.h"
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include "crypto.h"
   9 #include "torlog.h"
  10 #include "../common/util.h"
  11 #include "compat.h"
  12 #include <openssl/bn.h>
  13 #include <openssl/rsa.h>
  14
  15 int
  16 main(int c, char **v)
  17 {
  18   crypto_pk_env_t *env;
  19   char *str;
  20   RSA *rsa;
  21   int wantdigest=0;
  22   int fname_idx;
  23   char *fname=NULL;
  24   init_logging();
  25
  26   if (c < 2) {
  27     fprintf(stderr, "Hi. I'm tor-checkkey.  Tell me a filename that "
  28             "has a PEM-encoded RSA public key (like in a cert) and I'll "
  29             "dump the modulus.  Use the --digest option too and I'll "
  30             "dump the digest.\n");
  31     return 1;
  32   }
  33
  34   if (crypto_global_init(0, NULL, NULL)) {
  35     fprintf(stderr, "Couldn't initialize crypto library.\n");
  36     return 1;
  37   }
  38
  39   if (!strcmp(v[1], "--digest")) {
  40     wantdigest = 1;
  41     fname_idx = 2;
  42     if (c<3) {
  43       fprintf(stderr, "too few arguments");
  44       return 1;
  45     }
  46   } else {
  47     wantdigest = 0;
  48     fname_idx = 1;
  49   }
  50
  51   fname = expand_filename(v[fname_idx]);
  52   str = read_file_to_str(fname, 0, NULL);
  53   tor_free(fname);
  54   if (!str) {
  55     fprintf(stderr, "Couldn't read %s\n", v[fname_idx]);
  56     return 1;
  57   }
  58
  59   env = crypto_new_pk_env();
  60   if (crypto_pk_read_public_key_from_string(env, str, strlen(str))<0) {
  61     fprintf(stderr, "Couldn't parse key.\n");
  62     return 1;
  63   }
  64   tor_free(str);
  65
  66   if (wantdigest) {
  67     char digest[HEX_DIGEST_LEN+1];
  68     if (crypto_pk_get_fingerprint(env, digest, 0)<0)
  69       return 1;
  70     printf("%s\n",digest);
  71   } else {
  72     rsa = _crypto_pk_env_get_rsa(env);
  73     str = BN_bn2hex(rsa->n);
  74
  75     printf("%s\n", str);
  76   }
  77
  78   return 0;
  79 }
  80