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         printf("Reading from %s (this may take a while) ...\n",
  26                HIG_ENTROPY_SOURCE);
  27
  28         gen_key_bytes(secretkey, sizeof(secretkey));
  29         crypto_scalarmult_curve25519_base(publickey, secretkey);
  30
  31         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
  32         write_blob_or_die(file, publickey, sizeof(publickey));
  33         printf("Public key written to %s!\n", file);
  34
  35         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
  36         write_blob_or_die(file, secretkey, sizeof(secretkey));
  37         printf("Secret key written to %s!\n", file);
  38
  39         xmemset(publickey, 0, sizeof(publickey));
  40         xmemset(secretkey, 0, sizeof(secretkey));
  41 }
  42
  43 void verify_keypair(void)
  44 {
  45         int result;
  46         struct passwd *pw = getpwuid(getuid());
  47         unsigned char publickey[crypto_box_pub_key_size];
  48         unsigned char publicres[crypto_box_pub_key_size];
  49         unsigned char secretkey[crypto_box_sec_key_size];
  50         char file[128];
  51
  52         xmemset(publickey, 0, sizeof(publickey));
  53         xmemset(publicres, 0, sizeof(publicres));
  54         xmemset(secretkey, 0, sizeof(secretkey));
  55
  56         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PUBKEY);
  57         read_blob_or_die(file, publickey, sizeof(publickey));
  58
  59         slprintf(file, sizeof(file), "%s/%s", pw->pw_dir, FILE_PRIVKEY);
  60         read_blob_or_die(file, secretkey, sizeof(secretkey));
  61
  62         crypto_scalarmult_curve25519_base(publicres, secretkey);
  63         result = crypto_verify_32(publicres, publickey);
  64
  65         xmemset(publickey, 0, sizeof(publickey));
  66         xmemset(publicres, 0, sizeof(publicres));
  67         xmemset(secretkey, 0, sizeof(secretkey));
  68
  69         if (result)
  70                 panic("Keypair is corrupt! You need to regenerate!\n");
  71 }