keypair.c

   1 #include <string.h>
   2 #include <unistd.h>
   3 #include <sys/types.h>
   4 #include <pwd.h>
   5 #include <stdio.h>
   6
   7 #include "rnd.h"
   8 #include "die.h"
   9 #include "str.h"
  10 #include "crypto.h"
  11 #include "ioops.h"
  12 #include "config.h"
  13 #include "keypair.h"
  14
  15 void generate_keypair(void)
  16 {
  17         struct passwd *pw = getpwuid(getuid());
  18         unsigned char publickey[crypto_box_pub_key_size];
  19         unsigned char secretkey[crypto_box_sec_key_size];
  20         char file[128];
  21
  22         xmemset(publickey, 0, sizeof(publickey));
  23         xmemset(secretkey, 0, sizeof(secretkey));
  24
  25         curve25519_selftest();
  26
  27         printf("Reading from %s (this may take a while) ...\n",
  28                HIG_ENTROPY_SOURCE);
  29
  30         gen_key_bytes(secretkey, sizeof(secretkey));
  31         crypto_scalarmult_curve25519_base(publickey, secretkey);
  32
  33         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
  34         write_blob_or_die(file, publickey, sizeof(publickey));
  35         printf("Public key written to %s!\n", file);
  36
  37         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
  38         write_blob_or_die(file, secretkey, sizeof(secretkey));
  39         printf("Secret key written to %s!\n", file);
  40
  41         xmemset(publickey, 0, sizeof(publickey));
  42         xmemset(secretkey, 0, sizeof(secretkey));
  43 }
  44
  45 void verify_keypair(void)
  46 {
  47         int result;
  48         struct passwd *pw = getpwuid(getuid());
  49         unsigned char publickey[crypto_box_pub_key_size];
  50         unsigned char publicres[crypto_box_pub_key_size];
  51         unsigned char secretkey[crypto_box_sec_key_size];
  52         char file[128];
  53
  54         curve25519_selftest();
  55
  56         xmemset(publickey, 0, sizeof(publickey));
  57         xmemset(publicres, 0, sizeof(publicres));
  58         xmemset(secretkey, 0, sizeof(secretkey));
  59
  60         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
  61         read_blob_or_die(file, publickey, sizeof(publickey));
  62
  63         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
  64         read_blob_or_die(file, secretkey, sizeof(secretkey));
  65
  66         crypto_scalarmult_curve25519_base(publicres, secretkey);
  67         result = crypto_verify_32(publicres, publickey);
  68
  69         xmemset(publickey, 0, sizeof(publickey));
  70         xmemset(publicres, 0, sizeof(publicres));
  71         xmemset(secretkey, 0, sizeof(secretkey));
  72
  73         if (result)
  74                 panic("Keypair is corrupt! You need to regenerate!\n");
  75 }