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      1 
      2 #define TEST_NAME "auth7"
      3 #include "cmptest.h"
      4 
      5 static unsigned char key[32];
      6 static unsigned char c[600];
      7 static unsigned char a[64];
      8 
      9 int
     10 main(void)
     11 {
     12     size_t clen;
     13 
     14     for (clen = 0; clen < sizeof c; ++clen) {
     15         crypto_auth_keygen(key);
     16         randombytes_buf(c, clen);
     17         crypto_auth_hmacsha512(a, c, clen, key);
     18         if (crypto_auth_hmacsha512_verify(a, c, clen, key) != 0) {
     19             printf("fail %u\n", (unsigned int) clen);
     20             return 100;
     21         }
     22         if (clen > 0) {
     23             c[(size_t) rand() % clen] += 1 + (rand() % 255);
     24             if (crypto_auth_hmacsha512_verify(a, c, clen, key) == 0) {
     25                 printf("forgery %u\n", (unsigned int) clen);
     26                 return 100;
     27             }
     28             a[rand() % sizeof a] += 1 + (rand() % 255);
     29             if (crypto_auth_hmacsha512_verify(a, c, clen, key) == 0) {
     30                 printf("forgery %u\n", (unsigned int) clen);
     31                 return 100;
     32             }
     33         }
     34     }
     35     return 0;
     36 }
     37