verifykey.c

/* this is a block of example code I used to test the system early on no longer in use */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>

#include "hmac_sha2.h"
#include <ctype.h>


#define FNV_PRIME_32 16777619
#define MASK_24 (((uint32_t)1<<24)-1)  /* i.e., (u_int32_t)0xffffff */

uint32_t fnv_hasher(uint8_t *str)
{
    uint32_t hval = 0;
    /*
     * FNV-1 hash each octet in the buffer
     */
    int i = 0;
    for (i = 0; i < 32; i++) {

	/* multiply by the 32 bit FNV magic prime mod 2^32 */
	hval *= FNV_PRIME_32;
	/* xor the bottom with the current octet */
	hval ^= (uint32_t)str[i];
    }

    /* return our new hash value */
    return hval;
}

static void display_hex(unsigned length, uint8_t *data)
{
  unsigned i;
  printf("sha sum is:");
  for (i = 0; i<length; i++)
    printf("%02x", data[i]);
  printf("\n");
}



int
main(int argc, char **argv)
{
//  struct hmac_sha256_ctx sha256;
  uint8_t digest[SHA256_DIGEST_SIZE];
  uint8_t ihatebuffers[4] = {0};
  uint32_t fnv_hash,fnv_hash2;
  uint32_t time = 1296579900;
  memset(digest, 0, sizeof(digest));

uint8_t hmacKey5[]={
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,
  0x2a,0x2a,0x2a,0x2a,0x2a
};

  ihatebuffers[3] = (uint8_t)time;
  ihatebuffers[2] = (uint8_t)(time >> 8);
  ihatebuffers[1] = (uint8_t)(time >> 16);
  ihatebuffers[0] = (uint8_t)(time >> 24);
  hmac_sha256(hmacKey5, 256, ihatebuffers,4, digest, SHA256_DIGEST_SIZE);
//  ihatebuffers[3] = 'f';
//  ihatebuffers[2] = 'd';
//  ihatebuffers[1] = 's';
//  ihatebuffers[0] = 'a';


  printf("date: %02X\n", time);
  display_hex(SHA256_DIGEST_SIZE, digest);
  fnv_hash = fnv_hasher(digest);
  printf("32 byte hash:%02X\n", fnv_hash);
  fnv_hash2 = (fnv_hash>>24) ^ (fnv_hash & MASK_24);
  printf("24 byte hash:%02X\n", fnv_hash2);

  return EXIT_SUCCESS;

}