test_hmac.c

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/*
 * test_hmac.c - calculates the HMAC-SHA1 hash value
 * 
 * This algorithm is used in the OTA Prov architecture for bootstrap
 * securtiy by means of a shared secret.
 * 
 * References:
 *   - WAP-184-PROVBOOT-20010314a.pdf (Provisioning Bootstrap), WAP Forum 
 *   - HMAC: Keyed-Hashing for Message Authentication”, Krawczyk, H., 
 *     Bellare, M., and Canetti, R., RFC 2104
 *
 * Stipe Tolj <stolj@wapme.de>
 */

#include <string.h>
#include <unistd.h>
#include <signal.h>

#include "gwlib/gwlib.h"

#ifdef HAVE_LIBSSL
#include <openssl/hmac.h>
#endif

#ifndef EVP_MAX_MD_SIZE
#define EVP_MAX_MD_SIZE 1
#endif

int main(int argc, char **argv)
{
    Octstr *data, *filename, *mac, *key;
    unsigned char macbuf[EVP_MAX_MD_SIZE], *p;
    int mac_len;
#ifdef HAVE_LIBSSL
    HMAC_CTX *ctx;
#endif

    gwlib_init();

    get_and_set_debugs(argc, argv, NULL);

    if (argc < 3)
        panic(0, "Syntax: %s <key> <file>\n", argv[0]);
  
    key = octstr_create(argv[1]);    
    filename = octstr_create(argv[2]);
    data = octstr_read_file(octstr_get_cstr(filename));

    if (data == NULL)
        panic(0, "Cannot read file.");

    debug("",0,"Dumping file `%s':", octstr_get_cstr(filename));
    octstr_dump(data, 0);

#ifdef HAVE_LIBSSL
#if OPENSSL_VERSION_NUMBER < 0x10100000L
    HMAC_Init(ctx, octstr_get_cstr(key), octstr_len(key), EVP_sha1());
#else
    ctx = HMAC_CTX_new();
#endif
    p = HMAC(EVP_sha1(), octstr_get_cstr(key), octstr_len(key), 
         octstr_get_cstr(data), octstr_len(data), 
         macbuf, &mac_len);
#if OPENSSL_VERSION_NUMBER < 0x10100000L
    HMAC_cleanup(ctx);
#else
    HMAC_CTX_free(ctx);
#endif
#else
    macbuf[0] = 0;
    mac_len = 0;
    p = macbuf;
    warning(0, "No SSL support. Can't calculate HMAC value.");
#endif
    
    mac = octstr_create_from_data(p, mac_len);
    octstr_binary_to_hex(mac, 0);
    
    debug("",0,"HMAC of file `%s' and key `%s' is:", 
          octstr_get_cstr(filename), octstr_get_cstr(key));
    octstr_dump(mac, 0);      

    octstr_destroy(data);
    octstr_destroy(mac);
    octstr_destroy(key);
    gwlib_shutdown();
    return 0;
}