int main()

in native/src/seal/util/blake2xb.c [186:255]
56 lines of code
14 McCabe index (conditional complexity)

int main( void )
{
  uint8_t key[BLAKE2B_KEYBYTES];
  uint8_t buf[BLAKE2_KAT_LENGTH];
  size_t i, step, outlen;

  for( i = 0; i < BLAKE2B_KEYBYTES; ++i ) {
    key[i] = ( uint8_t )i;
  }

  for( i = 0; i < BLAKE2_KAT_LENGTH; ++i ) {
    buf[i] = ( uint8_t )i;
  }

  /* Testing length of outputs rather than inputs */
  /* (Test of input lengths mostly covered by blake2b tests) */

  /* Test simple API */
  for( outlen = 1; outlen <= BLAKE2_KAT_LENGTH; ++outlen )
  {
      uint8_t hash[BLAKE2_KAT_LENGTH] = {0};
      if( blake2xb( hash, outlen, buf, BLAKE2_KAT_LENGTH, key, BLAKE2B_KEYBYTES ) < 0 ) {
        goto fail;
      }

      if( 0 != memcmp( hash, blake2xb_keyed_kat[outlen-1], outlen ) )
      {
        goto fail;
      }
  }

  /* Test streaming API */
  for(step = 1; step < BLAKE2B_BLOCKBYTES; ++step) {
    for (outlen = 1; outlen <= BLAKE2_KAT_LENGTH; ++outlen) {
      uint8_t hash[BLAKE2_KAT_LENGTH];
      blake2xb_state S;
      uint8_t * p = buf;
      size_t mlen = BLAKE2_KAT_LENGTH;
      int err = 0;

      if( (err = blake2xb_init_key(&S, outlen, key, BLAKE2B_KEYBYTES)) < 0 ) {
        goto fail;
      }

      while (mlen >= step) {
        if ( (err = blake2xb_update(&S, p, step)) < 0 ) {
          goto fail;
        }
        mlen -= step;
        p += step;
      }
      if ( (err = blake2xb_update(&S, p, mlen)) < 0) {
        goto fail;
      }
      if ( (err = blake2xb_final(&S, hash, outlen)) < 0) {
        goto fail;
      }

      if (0 != memcmp(hash, blake2xb_keyed_kat[outlen-1], outlen)) {
        goto fail;
      }
    }
  }

  puts( "ok" );
  return 0;
fail:
  puts("error");
  return -1;
}