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/*
     This file is part of GNUnet.
     Copyright (C) 2004, 2005, 2006 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file util/test_crypto_ksk.c
 * @brief testcase for util/crypto_ksk.c
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_signatures.h"
#include "gnunet_time_lib.h"

#define TESTSTRING "Hello World\0"
#define MAX_TESTVAL 20
#define UNIQUE_ITER 6
#define ITER 25


static int
testCorrectKey ()
{
  const char *want =
      "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";
  GNUNET_HashCode in;
  struct GNUNET_CRYPTO_RsaPrivateKey *hostkey;
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
  int i;
  char out[3];

  FPRINTF (stderr, "%s",  "Testing KBlock key correctness");
  GNUNET_CRYPTO_hash ("X", strlen ("X"), &in);
  hostkey = GNUNET_CRYPTO_rsa_key_create_from_hash (&in);
  if (hostkey == NULL)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  GNUNET_CRYPTO_rsa_key_get_public (hostkey, &pkey);
  GNUNET_CRYPTO_rsa_key_free (hostkey);
#if 0
  for (i = 0; i < sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded); i++)
    printf ("%02x", ((unsigned char *) &pkey)[i]);
  printf ("\n");
#endif
  for (i = 0; i < sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded); i++)
  {
    snprintf (out, sizeof (out), "%02x", ((unsigned char *) &pkey)[i]);
    if (0 != strncmp (out, &want[i * 2], 2))
    {
      FPRINTF (stderr, " Failed! Wanted %.2s but got %2s at %d\n", &want[i * 2],
               out, i);
      return GNUNET_SYSERR;
    }
  }
  FPRINTF (stderr, "%s",  " OK\n");
  return GNUNET_OK;
}


static int
testMultiKey (const char *word)
{
  GNUNET_HashCode in;
  struct GNUNET_CRYPTO_RsaPrivateKey *hostkey;
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey1;
  int i;

  FPRINTF (stderr, "Testing KBlock key uniqueness (%s) ", word);
  GNUNET_CRYPTO_hash (word, strlen (word), &in);
  hostkey = GNUNET_CRYPTO_rsa_key_create_from_hash (&in);
  if (hostkey == NULL)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  GNUNET_CRYPTO_rsa_key_get_public (hostkey, &pkey);
  /*
   * for (i=0;i<sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded);i++)
   * printf("%02x", ((unsigned char*) &pkey)[i]);
   * printf("\n"); */
  GNUNET_CRYPTO_rsa_key_free (hostkey);
  for (i = 0; i < UNIQUE_ITER; i++)
  {
    FPRINTF (stderr, "%s",  ".");
    hostkey = GNUNET_CRYPTO_rsa_key_create_from_hash (&in);
    if (hostkey == NULL)
    {
      GNUNET_break (0);
      FPRINTF (stderr, "%s",  " ERROR\n");
      return GNUNET_SYSERR;
    }
    GNUNET_CRYPTO_rsa_key_get_public (hostkey, &pkey1);
    GNUNET_CRYPTO_rsa_key_free (hostkey);
    if (0 !=
        memcmp (&pkey, &pkey1,
                sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
    {
      GNUNET_break (0);
      FPRINTF (stderr, "%s",  " ERROR\n");
      return GNUNET_SYSERR;
    }
  }
  FPRINTF (stderr, "%s",  " OK\n");
  return GNUNET_OK;
}


static int
testEncryptDecrypt (struct GNUNET_CRYPTO_RsaPrivateKey *hostkey)
{
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
  struct GNUNET_CRYPTO_RsaEncryptedData target;
  char result[MAX_TESTVAL];
  int i;
  struct GNUNET_TIME_Absolute start;
  int ok;

  FPRINTF (stderr, "%s",  "W");
  GNUNET_CRYPTO_rsa_key_get_public (hostkey, &pkey);

  ok = 0;
  start = GNUNET_TIME_absolute_get ();
  for (i = 0; i < ITER; i++)
  {
    FPRINTF (stderr, "%s",  ".");
    if (GNUNET_SYSERR ==
        GNUNET_CRYPTO_rsa_encrypt (TESTSTRING, strlen (TESTSTRING) + 1, &pkey,
                                   &target))
    {
      FPRINTF (stderr, "%s",  "GNUNET_CRYPTO_rsa_encrypt returned SYSERR\n");
      ok++;
      continue;
    }
    if (-1 ==
        GNUNET_CRYPTO_rsa_decrypt (hostkey, &target, result,
                                   strlen (TESTSTRING) + 1))
    {
      FPRINTF (stderr, "%s",  "GNUNET_CRYPTO_rsa_decrypt returned SYSERR\n");
      ok++;
      continue;
    }
    if (strncmp (TESTSTRING, result, strlen (TESTSTRING)) != 0)
    {
      printf ("%s != %.*s - testEncryptDecrypt failed!\n", TESTSTRING,
              MAX_TESTVAL, result);
      ok++;
      continue;
    }
  }
  printf ("%d RSA encrypt/decrypt operations %llums (%d failures)\n", ITER,
          (unsigned long long)
          GNUNET_TIME_absolute_get_duration (start).rel_value, ok);
  if (ok == 0)
    return GNUNET_OK;
  else
    return GNUNET_SYSERR;
}

static int
testSignVerify (struct GNUNET_CRYPTO_RsaPrivateKey *hostkey)
{
  struct GNUNET_CRYPTO_RsaSignature sig;
  struct GNUNET_CRYPTO_RsaSignaturePurpose purp;
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
  int i;
  struct GNUNET_TIME_Absolute start;
  int ok = GNUNET_OK;

  FPRINTF (stderr, "%s",  "W");
  GNUNET_CRYPTO_rsa_key_get_public (hostkey, &pkey);
  start = GNUNET_TIME_absolute_get ();
  purp.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose));
  purp.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TEST);
  for (i = 0; i < ITER; i++)
  {
    FPRINTF (stderr, "%s",  ".");
    if (GNUNET_SYSERR == GNUNET_CRYPTO_rsa_sign (hostkey, &purp, &sig))
    {
      FPRINTF (stderr, "%s",  "GNUNET_CRYPTO_rsa_sign returned SYSERR\n");
      ok = GNUNET_SYSERR;
      continue;
    }
    if (GNUNET_SYSERR ==
        GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TEST, &purp, &sig,
                                  &pkey))
    {
      printf ("GNUNET_CRYPTO_rsa_verify failed!\n");
      ok = GNUNET_SYSERR;
      continue;
    }
    if (GNUNET_SYSERR !=
        GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
                                  &purp, &sig, &pkey))
    {
      printf ("GNUNET_CRYPTO_rsa_verify failed to fail!\n");
      ok = GNUNET_SYSERR;
      continue;
    }
  }
  printf ("%d RSA sign/verify operations %llums\n", ITER,
          (unsigned long long)
          GNUNET_TIME_absolute_get_duration (start).rel_value);
  return ok;
}


int
main (int argc, char *argv[])
{
  int failureCount = 0;
  GNUNET_HashCode in;
  struct GNUNET_CRYPTO_RsaPrivateKey *hostkey;

  GNUNET_log_setup ("test-crypto-ksk", "WARNING", NULL);
  if (GNUNET_OK != testCorrectKey ())
    failureCount++;
  GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_WEAK, &in);
  hostkey = GNUNET_CRYPTO_rsa_key_create_from_hash (&in);
  if (hostkey == NULL)
  {
    printf ("\nGNUNET_CRYPTO_rsa_key_create_from_hash failed!\n");
    return 1;
  }
  if (GNUNET_OK != testMultiKey ("foo"))
    failureCount++;
  if (GNUNET_OK != testMultiKey ("bar"))
    failureCount++;
  if (GNUNET_OK != testEncryptDecrypt (hostkey))
    failureCount++;
  if (GNUNET_OK != testSignVerify (hostkey))
    failureCount++;
  GNUNET_CRYPTO_rsa_key_free (hostkey);

  if (failureCount != 0)
  {
    printf ("\n\n%d TESTS FAILED!\n\n", failureCount);
    return -1;
  }
  return 0;
}