mdw@git.distorted.org.uk Git - catacomb/blob - utils/poly1305-mct.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include <mLib/bits.h>
   5
   6 #include "ct.h"
   7 #include "rijndael-ecb.h"
   8 #include "poly1305.h"
   9
  10 #define MSZMAX 1000
  11 #define NITER 1000000
  12
  13 int main(void)
  14 {
  15   unsigned i, msz, ii;
  16   rijndael_ecbctx rij;
  17   poly1305_key key;
  18   poly1305_ctx mac;
  19   octet
  20     r[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  21     n[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  22     k[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  23     s[16], t[16],
  24     m[MSZMAX] = { 0 };
  25 #ifdef notdef
  26   octet t0[16], t1[16];
  27 #endif
  28
  29   rijndael_ecbinit(&rij, k, sizeof(k), 0);
  30   poly1305_keyinit(&key, r, sizeof(r));
  31   for (ii = 0; ii < NITER; ii++) {
  32     msz = 0;
  33     for (;;) {
  34       rijndael_ecbencrypt(&rij, n, s, 16);
  35
  36       poly1305_macinit(&mac, &key, s);
  37       poly1305_hash(&mac, m, msz);
  38       poly1305_done(&mac, t);
  39       for (i = 0; i < sizeof(t); i++) printf("%02x", t[i]);
  40       putchar('\n');
  41
  42 #ifdef notdef
  43       poly1305_macinit(&mac, &key, s);
  44       poly1305_hash(&mac, m, msz);
  45       poly1305_done(&mac, t0);
  46       if (!ct_memeq(t, t0, sizeof(t))) {
  47         fprintf(stderr, "verify failed\n");
  48         exit(112);
  49       }
  50
  51       t0[rand()%16] += 1 + rand()%255;
  52       poly1305_macinit(&mac, &key, s);
  53       poly1305_hash(&mac, m, msz);
  54       poly1305_done(&mac, t1);
  55       if (ct_memeq(t0, t1, sizeof(t))) {
  56         fprintf(stderr, "verify accepted wrong tag\n");
  57         exit(112);
  58       }
  59 #endif
  60
  61       if (msz >= MSZMAX) break;
  62       n[0] ^= ii;
  63       for (i = 0; i < 16; i++) n[i] ^= t[i];
  64       if (msz%2) {
  65         for (i = 0; i < 16; i++) k[i] ^= t[i];
  66         rijndael_ecbinit(&rij, k, sizeof(k), 0);
  67       }
  68       if (msz%3) {
  69         for (i = 0; i < 16; i++) r[i] ^= t[i];
  70         poly1305_keyinit(&key, r, sizeof(r));
  71       }
  72       m[msz++] ^= t[0];
  73     }
  74   }
  75
  76   return (0);
  77 }